Taxonomic names from J. J. Sepkoski 2002
- Aachenaspis [Cephalaspidiformes]
- Aacocrinus, Bowsher 1955 [Monobathrida]
- Aaglacrinus [Cladida]
- Aaleniella [Podocopida]
- Aatocrinus, Moore and Plummer 1940 [Cladida]
- Abacocrinus, Angelin 1878 [Monobathrida]
- Abactinocrinus, L. R. Laudon and J. L. Severson 1953 [Monobathrida]
- Abadehella, Okimura and Ishii 1975 [Abadehellidae]
- Abadiella, Hupe 1952 [Abadiellidae]
- Abadzekhia, Bannikov 1985 [Perciformes]
- Abakania, Poletaeva 1973 [Corynexochidae]
- Abakanopleura, Sivov 1955 [Trilobita]
- Abakolia, Bognibova 1970 [Weymouthiidae]
- Abathocrinus, Strimple 1963 [Monobathrida]
- Abathomphalus [Foraminifera]
- Abatocrinus, Lane 1963 [Monobathrida]
- Abatus [Schizasteridae]
- Abbasites [Hammatoceratidae]
- Abderospira, Dall 1896 [Cylichnidae]
- Abditodentrix [Bolivinitidae]
- Abditoloculina [Palaeocopida]
- Abdounia, Cappetta 1980 [Carchariniformes]
- Abdullaevia [Foraminifera]
- Aberia [Rhactorthidae]
- Abertella, Durham 1953 [Abertellidae]
- Abharella, Wittke 1984 [Asaphida]
- Abicyathus [Cribricyathea]
- Abiesgraptus [Graptoloidea]
- Abludoglyptocrinus, Kolata 1982 [Monobathrida]
- Abnormisphaera [Nassellaria]
- Aboriginella, Koneva 1983 [Lingulellotretidae]
- Abra, Lamarck 1818 [Semelidae]
- Abrachiocrinus, Wanner 1923 [Cladida]
- Abrardia [Foraminifera]
- Abretiella [Neogastropoda]
- Abrobairdia [Bairdiidae]
- Abrocythereis [Podocopida]
- Abrograptus [Graptoloidea]
- Abrotocrinus, Miller and Gurley 1890 [Cladida]
- Abruptolopha, Vialov 1936 [Ostreidae]
- Absalomichthys, Whitley 1933 [Caristiidae]
- Absenticosta [Productellidae]
- Absidaticonus [Helcionellidae]
- Absonocytheropteron [Podocopida]
- Abursus [Podocopida]
- Abyssamina [Foraminifera]
- Abyssocrinus, Strimple 1963 [Crinoidea]
- Abyssocypris [Podocopida]
- Abyssocythere [Podocopida]
- Abyssocythereis [Podocopida]
- Abyssothyris [Dyscoliidae]
- Acabaria, Gray 1859 [Gorgonacea]
- Acaciapora, Moore and Jeffords 1945 [Pachyporidae]
- Acacocrinus, Wachsmuth and Springer 1897 [Monobathrida]
- Acadagnostus, Kobayashi 1939 [Diplagnostidae]
- Acadiocaris [Tanaidacea]
- Acadoparadoxides, Green 1834 [Paradoxididae]
- Acaeniotyle, Foreman 1973 [Parvivaccidae]
- Acalepha [Trachylinida]
- Acambona [Retziidae]
- Acamptochetus [Neogastropoda]
- Acamptogenotia, Rovereto 1899 [Turridae]
- Acandylacanthus, St. John and Worthen 1875 [Ctenacanthiformes]
- Acanothyra [Hexactinellida]
- Acanthactinella [Reticulosa]
- Acanthaecites [Oppeliidae]
- Acanthalepis, McCoy 1846 [Rhombifera]
- Acanthambonia, Cooper 1956 [Siphonotretidae]
- Acantharia, class [Actinopoda]
- Acanthastrea, Milne-Edwards and Haime 1848 [Mussidae]
- Acanthastrella [Astrophorida]
- Acanthastus, Kozlowski 1948 [Graptolithina]
- Acanthechinus [Phymosomatidae]
- Acanthina, Fischer de Waldheim 1807 [Muricidae]
- Acanthinites, E. v. Mojsisovics 1893 [Tibetitidae]
- Acanthinucella [Muricidae]
- Acanthobolbina [Palaeocopida]
- Acanthocardia, Gray 1851 [Cardiidae]
- Acanthocarpus, Stimpson 1870 [Calappidae]
- Acanthocella, Canu and Bassler 1917 [Cribrilinidae]
- Acanthocephalus, Qiu 1983 [Trilobita]
- Acanthoceramoporella [Cystoporata]
- Acanthoceras, Neumayr 1875 [Acanthoceratidae]
- Acanthoceratites, Schrammen 1928 [Ceratitidae]
- Acanthochaetetes, Fischer 1970 [Acanthochaetetidae]
- Acanthochirana, Strand 1928 [Aegeridae]
- Acanthochitina [Rhizopodea]
- Acanthochitona, Gray 1821 [Acanthochitonidae]
- Acanthocircus, Squinabol 1903 [Saturnalidae]
- Acanthoclava [Problematica]
- Acanthoclema [Nikiforovellidae]
- Acanthoclymenia, Hyatt 1900 [Acanthoclymeniidae]
- Acanthocordylodus [Phragmodontidae]
- Acanthocosta [Productidae]
- Acanthocrania, Williams 1943 [Craniidae]
- Acanthocrinus, F. A. Roemer 1850 [Diplobathrida]
- Acanthocyathus, Milne-Edwards and Haime 1848 [Caryophylliidae]
- Acanthocystites, Barrande 1887 [Eocrinoidea]
- Acanthocythere [Podocopida]
- Acanthocythereis [Podocopida]
- Acanthodesia [Membraniporidae]
- Acanthodictya [Reticulosa]
- Acanthodida, order, Berg 1940 [Acanthodii]
- Acanthodii, class, Owen 1846 [Teleostomi]
- Acanthodina [Conodontophorida]
- Acanthodiscus, Uhlig 1905 [Neocomitidae]
- Acanthodus [Conodontophorida]
- Acanthogammaridae, family [Amphipoda]
- Acanthoglypha [Clarkellidae]
- Acanthognathus, Duncker 1912 [Syngnathidae]
- Acanthograptus [Dendroidea]
- Acanthogyra, Ogilvie 1897 [Rhipidogyridae]
- Acanthohoplites, Sinzow 1908 [Deshayesitidae]
- Acantholaminatus [Trepostomida]
- Acantholenus, Matthew 1898 [Trilobita]
- Acantholytoceras, Spath 1932 [Crioceratitidae]
- Acanthomeridion, Hou et al. 1989 [Archaeocopida]
- Acanthomeridion [Ostracoda]
- Acanthometopus, Lu and Qian 1983 [Ptychopariida]
- Acanthomicmacca, Hupé 1953 [Chengkouiidae]
- Acanthomorpha, order, Rosen 1973 [Actinopteri]
- Acanthonautilus, Foord 1896 [Solenochilidae]
- Acanthonotus, Cuvier 1800 [Perciformes]
- Acanthophillia [Anthozoa]
- Acanthophora [Astrophorida]
- Acanthophyllia, Wells 1937 [Mussidae]
- Acanthophyllum, Dybowski 1873 [Ptenophyllidae]
- Acanthoplecta [Productellidae]
- Acanthopleura, Guilding 1829 [Chitonidae]
- Acanthopleurella, Groom 1902 [Ptychopariida]
- Acanthopleuroceras, Hyatt 1900 [Polymorphitidae]
- Acanthopora [Cyclostomata]
- Acanthoporella [Cheilostomata]
- Acanthoporidea [Cheilostomata]
- Acanthoproductus [Productidae]
- Acanthopygaeus, Leriche 1906 [Siganidae]
- Acanthopyge, Hawle and Corda 1847 [Lichidae]
- Acanthopyle [Spumellaria]
- Acanthopyrgus, R.C. Handfield 1967 [Capsulocyathida]
- Acanthoraphis [Poecilosclerida]
- Acanthoscapha [Beecherellidae]
- Acanthoscaphites, Nowak 1911 [Scaphitidae]
- Acanthoscyllium, Cappetta 1980 [Orectolobiformes]
- Acanthosphaera, Ehrenberg 1859 [Actinommidae]
- Acanthospirifer [Delthyrididae]
- Acanthospongia [Lyssacinosida]
- Acanthoteuthis, Wagner in Munster 1839 [Belemnitida]
- Acanthothiris, d'Orbigny 1849 [Acanthothirididae]
- Acanthothoraci, order, Stensiö 1944 [Placodermi]
- Acanthotoechia [Polytoechiidae]
- Acanthotrigonia [Megatrigoniidae]
- Acanthotrypa [Trepostomida]
- Acanthotrypina [Trepostomida]
- Acanthurus, Forskal 1775 [Acanthuridae]
- Acantonodella, Zaspelova 1952 [Drepanellidae]
- Acar, Gray 1857 [Arcidae]
- Acareorthis [Chileidae]
- Acariaeocrinus, Biese 1935 [Crinoidea]
- Acariaiocrinus, Wanner 1924 [Cladida]
- Acarinina [Foraminifera]
- Acaroceras, Chen et al. 1979 [Acaroceratidae]
- Acasta, Leach 1817 [Archaeobalanidae]
- Acastava, Richter 1954 [Acastidae]
- Acaste, Goldfuss 1843 [Acastidae]
- Acastella, Reed 1925 [Acastidae]
- Acastellina, Richter and Richter 1975 [Phacopida]
- Acastoides, Delo 1935 [Acastidae]
- Acastopyge, Tomczykowa and Tomczyk 1970 [Phacopida]
- Accordiella [Pfenderinidae]
- Acculina, Misius and Ushatinskaya 1977 [Leptellinidae]
- Accurganaxon [Anthozoa]
- Acdalina [Anthozoa]
- Acentrogobius, Bleeker 1874 [Perciformes]
- Acentrophorus, Traquair 1877 [Semionotidae]
- Acentrotremites, R. Etheridge and P. H. Carpenter 1883 [Spiraculata]
- Acerahedrina [Nassellaria]
- Acercostraca, order, Lehmann 1955 [Marrelomorpha]
- Acernaspis, Campbell 1967 [Phacopidae]
- Acerocanium [Nassellaria]
- Acerocare [Olenidae]
- Acerocarina, Poulson 1951 [Olenidae]
- Aceroproetus, Kolobova 1988 [Proetida]
- Acervularia, Schweigger 1819 [Acervulariidae]
- Acervulina [Acervulinidae]
- Acestrus, Agassiz 1845 [Blochiidae]
- Acetopeltis [Proetida]
- Acevina [Mollusca]
- Acharax, Dall 1908 [Solemyidae]
- Achatella, Delo 1935 [Pterygometopidae]
- Acheilops, Ulrich 1931 [Catillicephalidae]
- Acheilus, Clark 1924 [Catillicephalidae]
- Achiurus [Pleuronectiformes]
- Achorocyathus [Cribricyathea]
- Achradocrinus, Schultze 1866 [Cladida]
- Achradocystites, Volborth 1870 [Comarocystitida]
- Achrestogrammus, Jordan 1921 [Hexagrammidae]
- Achrochordonia [Demospongea]
- Aciculella [Hippocrepinidae]
- Aciculiscala, N. F. Sohl 1963 [Epitoniidae]
- Acidaspidella, Pokrovskaya 1963 [Lichakephalidae]
- Acidaspides, Lermontova 1951 [Lichakephalidae]
- Acidaspidina, Lazerenko 1960 [Lichakephalidae]
- Acidaspis, Murchison 1839 [Odontopleuridae]
- Acidiphorus, Raymond 1925 [Bathyuridae]
- Acidiscus, Rasetti 1966 [Weymouthiidae]
- Acidnomelos [Nassellaria]
- Acidocharacus [Sabelliditida]
- Acidolites, Lang et al. 1940 [Coccoserididae]
- Acidotocarena [Problematica]
- Acila, H. Adams and A. Adams 1858 [Nuculidae]
- Acila (Truncacila), Grant and Gale 1931 [Nuculidae]
- Acilia, Koken 1896 [Prostyliferidae]
- Acimetopus, Rasetti 1966 [Weymouthiidae]
- Acinophyllum, McLaren 1959 [Eridophyllidae]
- Acipenseriformes, order, Berg 1940 [Actinopteri]
- Acirsa, Mörch 1857 [Epitoniidae]
- Acirsella, de Boury 1886 [Epitoniidae]
- Acleistoceras, Hyatt 1884 [Acleistoceratidae]
- Aclis, Loven 1846 [Aclididae]
- Acloeodictya [Reticulosa]
- Acmaea, Eschscholtz 1830 [Lottiidae]
- Acmarhachis, Resser 1938 [Agnostidae]
- Acme, Hartman 1821 [Aciculidae]
- Acmoniodus, Hussakof and Bryant 1920 [Ptyctodontidae]
- Acmophyllum, Sytova 1968 [Ptenophyllidae]
- Acobaecardium [Pterioida]
- Acolocrinus, Kesling and Paul 1971 [Crinoidea]
- Acominia [Neogastropoda]
- Acompsoceras [Acanthoceratidae]
- Aconeceras, Hyatt 1903 [Oppeliidae]
- Acontheus, Angelin 1852 [Corynexochida]
- Acorylus, Olsson and Harbison 1953 [Tellinidae]
- Acoscinopleura [Cheilostomata]
- Acosmostroma, Stock 1998 [Densastromatidae]
- Acostina [Foraminifera]
- Acotripus [Nassellaria]
- Acratia, Delo 1930 [Acratiidae]
- Acratina [Bairdiidae]
- Acratinella [Acratiidae]
- Acravincula [Palaeocopida]
- Acriclymenia, Bogoslovsky 1975 [Carinoclymeniidae]
- Acrilloscala, Sacco 1890 [Epitoniidae]
- Acrimeroceras, Becker 1993 [Dimeroceratidae]
- Acrioceras, Hyatt 1900 [Ancyloceratidae]
- Acrobotrys, Haeckel 1881 [Cannobotryidae]
- Acrocanites, Schindewolf 1922 [Prodromitidae]
- Acrocephalaspis, Ivshin 1953 [Ptychopariida]
- Acrocephalella, Rozova 1963 [Acrocephalitidae]
- Acrocephalina, Troedsson 1937 [Ptychopariida]
- Acrocephalites, Wallerius 1895 [Acrocephalitidae]
- Acrocephalops, Poulson 1927 [Bolaspididae]
- Acrocidaris [Pseudodiadematidae]
- Acrocoelites [Megateuthididae]
- Acrocoelum [Mathildidae]
- Acrocolpus, Cossmann 1895 [Cephalaspida]
- Acrocosmia [Coelostylinidae]
- Acrocrinus, Yandell 1855 [Monobathrida]
- Acrocyathus, d'Orbigny 1849 [Lithostrotionidae]
- Acrocythere, Neale 1960 [Progonocytheridae]
- Acrodirotes, Opik 1967 [Ptychopariida]
- Acrogenia [Cystoporata]
- Acrognathus, Agassiz 1836 [Scopelidae]
- Acrograptus [Graptoloidea]
- Acrohelia, Milne-Edwards and Haime 1857 [Oculinidae]
- Acrohybus, raymond 1937 [Trilobita]
- Acrolusia [Disasteridae]
- Acronotella [Podocopida]
- Acropeltis [Arbaciidae]
- Acrophyllum, Thomson and Nicholson 1876 [Acrophyllidae]
- Acropoma, Guenther 1859 [Acropomatidae]
- Acropora, Oken 1815 [Acroporidae]
- Acropora [Porinidae]
- Acroreia, Cossmann 1885 [Acroreiidae]
- Acrosaster [Arbaciidae]
- Acrosmilia, d'Orbigny 1849 [Acrosmiliidae]
- Acrosolarium, Koken 1896 [Cirridae]
- Acrosphaera, Haeckel 1881 [Collosphaeridae]
- Acrosphaerorthoceras [Orthocerida]
- Acrospirifer, Wedekind 1926 [Acrospiriferidae]
- Acrospyris, Haeckel 1881 [Triospyrididae]
- Acrossula [Ostracoda]
- Acrostemma, Cossmann 1889 [Cylichnidae]
- Acrosterigma, Dall 1900 [Cardiidae]
- Acrostylus, Cossmann 1896 [Heterostrophia]
- Acroteuthis, Stolley 1911 [Belemnitida]
- Acrothele, Linnarsson 1876 [Acrothelidae]
- Acrothyra, Mathew 1901 [Acrotretidae]
- Acrothyris [Stringocephalidae]
- Acrotreta, Kutorga 1848 [Acrotretidae]
- Acrotretella, Ireland 1961 [Torynelasmatidae]
- Acrotretida, order, Kuhn 1949 [Lingulata]
- Acruliammina, Loeblich and Tappan 1946 [Haplophragmoiidae]
- Acsaspedites [Trachylinida]
- Actaea, De Haan 1833 [Xanthidae]
- Actaeon, Oken 1815 [Acteonidae]
- Actaeonella (d'Orbigny 1843) [Acteonellidae]
- Actaeonellina, Pchelintsev 1963 [Cephalaspida]
- Actaeonema, Conrad 1865 [Turritellidae]
- Actaeonidea, Gabb 1872 [Cephalaspida]
- Actaeopsis, Carter 1898 [Decapoda]
- Actaeopyramis, P. Fischer 1885 [Cimidae]
- Actaeus [Arthropoda]
- Acteocina, Gray 1847 [Cylichnidae]
- Acteosaurus, H. von Meyer 1860 [Squamata]
- Actiangulata [Podocopida]
- Actinacis, d'Orbigny 1849 [Actinacididae]
- Actinaraea, d'Orbigny 1849 [Actinacididae]
- Actinaraeopsis, Roniewicz 1968 [Haplaraeidae]
- Actinastraea (d'Orbigny 1849) [Actinastreidae]
- Actinastraeopsis, Sikharulidze 1977 [Isastreidae]
- Actiniaria, order [Anthozoa]
- Actinobalanus, Moroni 1867 [Cirripedia]
- Actinocamax, Miller 1823 [Belemnitellidae]
- Actinoceras, Bronn 1837 [Actinoceratidae]
- Actinocerida, order, C. Teichert 1933 [Cephalopoda]
- Actinochilina [Palaeocopida]
- Actinoconchus [Athyrididae]
- Actinocrinites, J. S. Miller 1821 [Actinocrinitidae]
- Actinocyathus, d'Orbigny 1849 [Axophyllidae]
- Actinocyclina [Foraminifera]
- Actinocythereis, Puri 1953 [Trachyleberididae]
- Actinodesma, Sandberger 1856 [Pterineidae]
- Actinodictya [Reticulosa]
- Actinodictyon, Parks 1909 [Actinodictyidae]
- Actinodonta, Philipps 1848 [Grammysiidae]
- Actinofungia [Axinellida]
- Actinoleuca, Oliver 1926 [Patellogastropoda]
- Actinomena, Opik 1930 [Strophomenidae]
- Actinomma, Haeckel 1862 [Actinommidae]
- Actinopeltis, Hawle and Corda 1847 [Cheiruridae]
- Actinophrentis, Ivanovskiy 1967 [Antiphyllidae]
- Actinophyma [Echinoidea]
- Actinopoda, phylum [Protista]
- Actinopora, d'Orbigny 1852 [Cyclostomata]
- Actinopsis [Actiniidae]
- Actinosepia, Whiteaves 1897 [Teuthida]
- Actinosiphon [Foraminifera]
- Actinostroma, Nicholson 1886 [Actinostromatidae]
- Actinostromaria, Haug 1909 [Actinostromariidae]
- Actinostromarianina, Lecompte 1952 [Actinostromarianinidae]
- Actinostromella, Boehnke 1915 [Actinostromellidae]
- Actinotaxia [Cyclostomata]
- Actinotocarcinus, R. Jenkins 1974 [Majidae]
- Actinotrigonia [Trigoniida]
- Actinotrypa [Cystoporata]
- Actisecos [Actisecidae]
- Actomphalus () [Omphalocirridae]
- Actumnus, Dana 1851 [Pilumnidae]
- Acuariceras [Parkinsoniidae]
- Aculatostroma [Stromatoporoidea]
- Aculeochrea, Val'kov and Sysoev 1970 [Trilobozoa]
- Aculopileus [Mollusca]
- Acuminia [Neogastropoda]
- Acuminothyris [Strophopleuridae]
- Acuprisma [Metacopida]
- Acupurpura [Muricidae]
- Acutatheca [Adolfiidae]
- Acutella, Lyashenko 1973 [Cyrtospiriferidae]
- Acuticloudina, Hahn and Pflug 1985 [Cloudinidae]
- Acuticostites, Semenov 1898 [Cephalopoda]
- Acuticythereis [Podocopida]
- Acuticytheretta [Podocopida]
- Acutilineolus [Cyrtiidae]
- Acutimitoceras, Librovitch 1957 [Gattendorfiidae]
- Acutiramus [Pterygotidae]
- Acutirostriconus [Mollusca]
- Acutitheca [Problematica]
- Acutoria [Spinocyrtiidae]
- Acutostrea, Vyalov 1936 [Ostreidae]
- Acvocaria [Bythocytheridae]
- Acylocrinus [Cladida]
- Acyrena [Cardiida]
- Adacrinus, Pabian and Strimple 1985 [Aesiocrinidae]
- Adamanophyllum, Vasilyuk 1959 [Adamanophyllidae]
- Adamczakia [Podocopida]
- Adamczakites [Palaeocopida]
- Adamnestia, Iredale 1936 [Cephalaspida]
- Adansonella [Cardiida]
- Adaptatrypa [Atrypidae]
- Adastocephalum, Mitchell 1919 [Phacopida]
- Adaverina, Klaamann 1969 [Aulocystidae]
- Adectorhynchus [Areostrophiidae]
- Adeditia [Podocopida]
- Adekoheastrea, Ogbe 1976 [Scleractinia]
- Adekunbiellda [Pogonophora]
- Adeloceras [Nautilida]
- Adelocoenia, d'Orbigny 1849 [Stylinidae]
- Adelocyrtis [Nassellaria]
- Adelodonex [Cardiida]
- Adelogonus, Opik 1967 [Trilobita]
- Adelograptus, Bulman 1941 [Dendroidea]
- Adelomelon, Dall 1906 [Volutidae]
- Adelomelon (Miomelon), Dall 1907 [Volutidae]
- Adelosina, d'Orbigny 1826 [Spiroloculinidae]
- Adelphobolbina [Palaeocopida]
- Adelphoceras, Barrande 1870 [Rutoceratidae]
- Adelungia [Hormosinidae]
- Ademtula [Neogastropoda]
- Adenifera [Cheilostomata]
- Adenus [Trimerellida]
- Adeona [Adeonidae]
- Adeonella [Adeonellidae]
- Adeonellopsis, MacGillivray 1886 [Adeonidae]
- Adeorbis, S. Wood 1848 [Vitrinellidae]
- Adercotryma [Foraminifera]
- Adesmoconularia [Scyphozoa]
- Adetognathus [Conodontophorida]
- Adetopora, Sokolov 1955 [Aulocystidae]
- Adhaerentia [Foraminifera]
- Adiaphragma [Rafinesquinidae]
- Adinocrinus, Kirk 1938 [Cladida]
- Adinophyllum [Anthozoa]
- Adinus [Neogastropoda]
- Adiozoptyxis, Dietrich 1925 [Nerineidae]
- Adkinsites, Spath 1931 [Brancoceratidae]
- Admete, Müller 1842 [Cancellariidae]
- Admetopsis [Neogastropoda]
- Adminiculoria [Strophopleuridae]
- Admirabilinella [Palaeocopida]
- Admiratella [Fenestrata]
- Admixtella [Polytoechiidae]
- Admodorugosus [Productellidae]
- Adnatida [Terebratellidae]
- Adnatoceras, Flower 1939 [Spyroceratidae]
- Adocetocystis, Koch and Strimple 1968 [Rhombifera]
- Adolfispirifer, Krylova 1962 [Echinospiriferidae]
- Adontorhina [Cardiida]
- Adradosia, Birenheide and Soto 1977 [Hapsiphyllidae]
- Adraheutina [Foraminifera]
- Adrana, Adams and Adams 1858 [Nuculanidae]
- Adrenia [Meganterididae]
- Adriacentrus, Radovcic 1975 [Beryciformes]
- Adrianella [Demospongea]
- Adriatella [Axinellida]
- Adula, H. Adams and A. Adams 1857 [Mytilidae]
- Adulomya [Solemyoida]
- Adversella [Sachitida]
- Adygella [Dielasmatidae]
- Adygelloides [Zugmayeriidae]
- Adygeya, Dogushaeva 1996 [Sepiida]
- Adytaster [Toxasteridae]
- Aechmella, Canu and Bassler 1917 [Onychocellidae]
- Aechmina, Jones and Holl 1869 [Aechminidae]
- Aechminaria, Coryell and Williamson 1936 [Aechminidae]
- Aedotes, Opik 1967 [Leiostegiidae]
- Aeduella, Westoll 1937 [Aeduellidae]
- Aegasteroceras [Asteroceratidae]
- Aeger, Munster 1839 [Aegeridae]
- Aegides [Maikhanellidae]
- Aegilops [Arcida]
- Aegiria, Opik 1933 [Aegiromenidae]
- Aegironetes [Aegiromenidae]
- Aegoceras [Liparoceratidae]
- Aegocrioceras, Spath 1924 [Aegocrioceratidae]
- Aegolytoceras [Lytoceratidae]
- Aegospyris, Haeckel 1881 [Triospyrididae]
- Aegrotocatellus, Adrain and Edgecombe 1995 [Phacopida]
- Aegyptiana [Podocopida]
- Aegyptopora [Cheilostomata]
- Aehmospira [Archaeogastropoda]
- Aeidimytilus, Olsson 1961 [Mytilidae]
- Aelga [Periplomatidae]
- Aellograptus [Graptolithina]
- Aemula [Platidiidae]
- Aemulophyllum, Oliver 1958 [Zaphrentidae]
- Aeneator, Finlay 1926 [Buccinidae]
- Aenigmastricklandia [Stricklandiidae]
- Aenigmastrophia, Boucot 1971 [Aenigmastrophiidae]
- Aenigmatectus, Hoare and Mapes 1996 [Hercolepadida]
- Aenigmocrinus, Strimple 1973 [Cladida]
- Aenona, Conrad 1870 [Tellinidae]
- Aeolisaccus [Earlandiidae]
- Aeoliscoides, Blot 1981 [Centriscidae]
- Aeoliscus, Jordan and Starks 1902 [Centriscidae]
- Aeolodon, H. von Meyer 1830 [Reptilia]
- Aeolopneustes [Phymosomatidae]
- Aeolopora [Cheilostomata]
- Aeolostreptis [Foraminifera]
- Aeora [Cardiida]
- Aepyaster [Edrioasterida]
- Aequipecten, Fischer 1886 [Pectinidae]
- Aequispirella, Finlay 1924 [Turbinidae]
- Aequspiriferina [Balatonospiridae]
- Aeretica [Cardiida]
- Aerithyris [Terebratulida]
- Aeschronectida, order, Schram 1969 [Malacostraca]
- Aesiocrinus [Aesiocrinidae]
- Aesopomum, Havlicek 1965 [Areostrophiidae]
- Aesopus, Gould 1860 [Columbellidae]
- Aetea [Cheilostomata]
- Aethalionopsis, Gaudant 1967 [Gonorhynchiformes]
- Aethedionide, Zhou and Ju 1983 [Dionididae]
- Aetheia [Basiliolidae]
- Aetheloxoceras [Yanhecerida]
- Aetheretmon, White 1927 [Actinopterygii]
- Aethiosolen [Orthocerida]
- Aethirhynchia, Shi 1990 [Erymnariidae]
- Aethoceras, Teichert and Glenister 1954 [Estonioceratidae]
- Aethocrinus, Ubaghs 1969 [Cladida]
- Aethodionide (Zhou and Ju 1983) [Asaphida]
- Aetholicotoxotis [Palaeocopida]
- Aethotaxis [Conodontophorida]
- Aetobatus, Blainville 1816 [Myliobatidae]
- Aetomylaeus, Garman 1908 [Myliobatidae]
- Aetostreon, Bayle 1878 [Gryphaeidae]
- Aexitrophocrinus [Dactylocrinidae]
- Afer, Conrad 1858 [Turbinellidae]
- Affinetrina, Luczkovska 1972 [Hauerinidae]
- Affiniptyxis, Lyssenko and Aliev 1987 [Archaeogastropoda]
- Affinocrinus, Knapp 1969 [Pirasocrinidae]
- Afganodesma, Termier and Termier 1971 [Praenuculidae]
- Afghanella, Thompson 1946 [Neoschwagerinidae]
- Afghanocare, Wolfart 1975 [Asaphida]
- Afiacyathus [Ajacicyathida]
- Aforia, Dall 1889 [Turridae]
- Afossochiton [Neoloricata]
- Afranticythereis [Podocopida]
- Africanaspis, Long et al. 1997 [Arthrodira]
- Africentrum, White and Moy-Thomas 1941 [Beryciformes]
- Africogryphaea, Freneix 1963 [Gryphaeidae]
- Afrobolivina [Foraminifera]
- Afrocardium, Tomlin 1931 [Cardiidae]
- Afrocornulina (Adegoke 1977) [Neotaenioglossa]
- Afrocypraea, Schilder 1932 [Cypraeidae]
- Afrocytheridea [Podocopida]
- Afrops, Alberti 1983 [Phacopidae]
- Afrovolutilithes [Neogastropoda]
- Agapella [Arcticidae]
- Agarhyncha, Havlicek 1982 [Trigonirhynchiidae]
- Agaricia, Lamarck 1801 [Agariciidae]
- Agaricocrinus, Austin 1851 [Monobathrida]
- Agaso, Cobbold 1934 [Agraulidae]
- Agasoma [Neogastropoda]
- Agassiceras [Arietitidae]
- Agassizia, Valenciennes 1846 [Schizasteridae]
- Agassizocrinus, Owen and Shumard 1852 [Cladida]
- Agassizodus, St. John and Worthen 1875 [Agassizodontidae]
- Agastapleura [Articulata]
- Agastograptus, Obut and Zaslavskaya 1983 [Retiolitidae]
- Agastophyllum [Anthozoa]
- Agastrioceras, Schmidt 1938 [Reticuloceratidae]
- Agastrocyathus [Archaeocyathida]
- Agatha, A. Adams 1860 [Pyramidellidae]
- Agathammina, Neumayr 1887 [Hemigordiopsidae]
- Agathamminoides, Zaninetti 1969 [Ophthalmidiidae]
- Agathelia, Reuss 1854 [Agatheliidae]
- Agathiphyllia, Reuss 1864 [Faviidae]
- Agathistoma [Tegulidae]
- Agathocrinus, Stoddart 1876 [Monobathrida]
- Agathodonta, Cossmann 1918 [Chilodontidae]
- Agathotoma, Cossmann 1899 [Turridae]
- Agecephalichthys, Wade 1935 [Palaeonisciformes]
- Agelagma, Opik 1967 [Catillicephalidae]
- Agelasina [Cardiida]
- Ageleodus, Owen 1867 [Chondrichthyes]
- Ageria, Abbass 1973 [Procerithiidae]
- Agerina, Tjernvik 1956 [Leiostegiidae]
- Agerinella [Bactryniidae]
- Agerostrea, Vialov 1936 [Ostreidae]
- Agetograptus [Graptoloidea]
- Agetolitella, Kim 1962 [Agetolitidae]
- Agetolites, Sokolov 1955 [Agetolitidae]
- Agglutinella [Hauerinidae]
- Agglutisolena, Senowbari-Daryan 1984 [Ataxophragmiidae]
- Aggregopora [Cyclostomata]
- Aglagalia, Hupé 1960 [Trilobita]
- Aglaocrinus, Strimple 1961 [Dendrocrinida]
- Aglaspella, Raasch 1939 [Aglaspididae]
- Aglaspis, Hall 1862 [Aglaspididae]
- Aglaspoides, Raasch 1939 [Aglaspididae]
- Aglaurides [Eunicemorpha]
- Aglithodictya [Reticulosa]
- Agmoblastus, Fay 1961 [Codasteridae]
- Agnewia, Tenison-Woods 1878 [Muricidae]
- Agnocardia, Stewart 1930 [Cardiidae]
- Agnomyax [Cardiida]
- Agnostardis, Opik 1963 [Agnostidae]
- Agnostida, order, Salter 1864 [Trilobita]
- Agnostogonus, Opik 1967 [Agnostida]
- Agnostotes, Opik 1963 [Diplagnostidae]
- Agnostus, Brongniart 1822 [Agnostidae]
- Agoniatites, Meek 1877 [Agoniatitidae]
- Agonus, Schneider 1801 [Agonidae]
- Agostocrinus, Kesling and Paul 1971 [Crinoidea]
- Agramatia [Araksalosiidae]
- Agraulaeva [Trilobita]
- Agraulopsis, Ruzicka 1940 [Ptychopariida]
- Agrenocythere [Podocopida]
- Agrioceras [Oncocerida]
- Agriopleura, Kühn 1832 [Radiolitidae]
- Agriopoma, Dall 1902 [Veneridae]
- Aguaraya, Rusconi 1954 [Trilobita]
- Aguayoaster [Brissidae]
- Aguilerella, Chavan 1951 [Bakevelliidae]
- Agulhasia [Chlidonophoridae]
- Agulhasina [Podocopida]
- Agyrekia, Koneva 1979 [Kutorginidae]
- Agyrekocyathus [Ajacicyathida]
- Ahlintella [Palaeocopida]
- Ahrdorffia, Trauth 1911 [Curtoseriidae]
- Ahtioconcha [Pterioida]
- Aiaiaspis, Nazarov 1973 [Ptychopariida]
- Aidarella, Lermontova 1951 [Trilobita]
- Aidynkulirhynchia [Basiliolidae]
- Aigialosaurus, Kramberger 1892 [Aigialosauridae]
- Aigoceras [Discosorida]
- Aikenicythere [Podocopida]
- Ailsacrinus [Millericrinida]
- Aimitus [Hyolithida]
- Aimulosia [Buffonellodidae]
- Ainacrinus, Wright 1941 [Sagenocrinida]
- Ainia, Leleshus 1974 [Romingeriidae]
- Ainigmacrinus, Hagdorn 1988 [Encrinida]
- Ainiktozoon [Problematica]
- Ainoceras [Nostoceratidae]
- Aipetoceras [Discosorida]
- Aipichthyoides, Gayet 1980 [Polymixiiformes]
- Aipichthys, Bassani 1882 [Carangidae]
- Aipoceras, Hyatt 1883 [Aipoceratidae]
- Airina [Palaeocopida]
- Airtonia [Anopliidae]
- Aisenvergia [Trepostomida]
- Aistagnostus, Xiang and Zhang 1985 [Agnostida]
- Aithriocrinus, Donov and Veltka 1993 [Cladida]
- Aitilia [Palaeocopida]
- Ajacicrepida, Wengtang and Jell 1987 [Asaphida]
- Ajacicyathellus [Ajacicyathida]
- Ajacicyathida, order, Bedford and Bedford 1939 [Regulares]
- Ajacicyathus [Ajacicyathida]
- Ajchalina [Palaeocopida]
- Ajrikina, Kryskov 1963 [Diceratocephalidae]
- Ajukuzella [Zeilleriidae]
- Aka, De Laubenfels 1936 [Adociidae]
- Akademiophyllum [Cribricyathea]
- Akadocrinus, Prokop 1962 [Eocrinoidea]
- Akagophyllum, Minato and Kato 1965 [Waagenophyllidae]
- Akantharges, Phleger 1936 [Lichida]
- Akatopora [Antroporidae]
- Akbashichia [Redlichiida]
- Akburunella [Neogastropoda]
- Akelina, Severgina 1967 [Plectambonitidae]
- Akera, Muller 1776 [Anaspidea]
- Akidograptus [Graptoloidea]
- Akiyoshiella [Foraminifera]
- Akiyosiphyllum, Yabe and Sugiyama 1942 [Lithostrotionidae]
- Akkermites [Palaeocopida]
- Akmilleria, Ruzhencev 1940 [Medlicottiidae]
- Akopovorhynchia [Rhynchonellidae]
- Akroceras [Discosorida]
- Aksopora [Disjectoporidae]
- Aktassia, Popov 1976 [Acrotretidae]
- Aktastioceras, Shimanskiy 1948 [Parabactritidae]
- Aktinorbitoides [Foraminifera]
- Aktjubocheilus [Oncocerida]
- Aktubinskia, Ruzhencev 1940 [Medlicottiidae]
- Aktubites, Ruzhencev 1955 [Parashumarditidae]
- Aktuboclymenia, Bogoslovsky 1979 [Clymeniidae]
- Aktugaia, Missarzhevsky 1976 [Mobergellidae]
- Ala [Spiriferidae]
- Alaba, H. Adams and A. A 1853 [Litiopidae]
- Alabamina, Toulmin 1941 [Alabaminidae]
- Alabaminoides [Foraminifera]
- Alabina, Dall 1902 [Cerithiidae]
- Alainaspis [Pteraspidomorphes]
- Alaiophyllum, Goryanov 1961 [Disphyllidae]
- Alakiria, Cuif 1976 [Volzeiidae]
- Alakolites [Palaeocopida]
- Alalcomenaeus, Simonetta 1970 [Arachnomorpha]
- Alanisia, Hupe 1953 [Estaingiidae]
- Alanites, Shevyrev 1968 [Khvalynitidae]
- Alariopsis, Alariopsis Gemmellaro 1878 [Maturifusidae]
- Alaskabolbina [Palaeocopida]
- Alaskacoscinus [Archaeocyathida]
- Alaskadiscus, Zhang 1980 [Yukoniidae]
- Alaskaspongia [Porata]
- Alaskoceras, Miller and Kummel 1945 [Estonioceratidae]
- Alasonia [Pharetronida]
- Alatacavellina [Podocopida]
- Alatacythere, G. Murray and K. M. Hussey 1942 [Podocopida]
- Alataleberis [Podocopida]
- Alataucyathus [Capsulocyathida]
- Alataurus, Repina 1964 [Palaeolenidae]
- Alatiformia [Spinocyrtiidae]
- Alatoconus [Hydroconozoa]
- Albaillella, Deflandre 1952 [Albaillellidae]
- Albanites [Albanitidae]
- Albansia, Howell 1937 [Ptychopariida]
- Albertaprion [Eunicemorpha]
- Albertellina, Palmer 1979 [Zacanthoididae]
- Alberticoryphe, Erben 1966 [Tropidocoryphidae]
- Albertoceras, Ulrich and Foerste 1936 [Ellesmeroceratidae]
- Albiconus [Conodonta]
- Albrunnicola, Martinsson 1979 [Hipponicharionidae]
- Albula, Gronow 1763 [Albulidae]
- Albumares, Fedonkin 1976 [Triradialomorpha]
- Alcaldops, Arbizu 1979 [Phacopida]
- Alceste, Hawle and Corda 1847 [Styginidae]
- Alcidellus [Cephalopoda]
- Alcidiella, Cossmann 1921 [Rissoidae]
- Alcimocrinus, Kirk 1938 [Cladida]
- Alcira [Neogastropoda]
- Alconeracyathus [Archaeocyathida]
- Alcymene, Ramsköld et al. 1994 [Calymenidae]
- Alcyonacea, order, Lamouroux 1816 [Anthozoa]
- Aldanaspis, Lermontova 1940 [Ptychopariida]
- Aldania [Chancelloriida]
- Aldanispirifer [Delthyrididae]
- Aldanites [Orulganitidae]
- Aldanospina [Chancelloriida]
- Aldanotheca [Orthothecida]
- Aldanotreta, Pel'man 1977 [Cryptotretidae]
- Alderina [Calloporidae]
- Aldingia [Kingenidae]
- Aldonaia [Aldonaiidae]
- Aldrichia [Neogastropoda]
- Alectis, Rafinesque 1815 [Perciformes]
- Alectona, Carter 1879 [Clionaidae]
- Alectrion, Montfort 1810 [Nassariidae]
- Alectryonella, Sacco 1897 [Ostreidae]
- Alekcinella, Ivshin 1862 [Ptychopariida]
- Alekseevaella [Innaechiidae]
- Alekseites, Ljaschenko 1969 [Volynitidae]
- Aleomorphella [Foraminifera]
- Alepes, Swainson 1839 [Perciformes]
- Alepisauriformes, order, Regan 1911 [Actinopteri]
- Alepisaurus [Alepisauridae]
- Aletes, Carpenter 1857 [Vermetidae]
- Alethynoceras [Nautilida]
- Aletoceras, Flower 1938 [Brevicoceratidae]
- Aletograptus, Obut and Sobolevskaya 1962 [Dendroidea]
- Alexandronautilus, Shimanskiy 1962 [Liroceratidae]
- Alexenia [Productidae]
- Alfeldites [Stephanoceratidae]
- Alfredina [Foraminifera]
- Algaroda, Dall 1918 [Littorinidae]
- Algerina [Podocopida]
- Algerites [Anisoceratidae]
- Algherella [Conodontophorida]
- Algomella [Mollusca]
- Alia, H. Adams and A. Adams 1853 [Columbellidae]
- Alichovia [Siphonotretidae]
- Aliconchidium, St.-Joseph 1942 [Subrianidae]
- Aliculastrum, Pilsbry 1896 [Haminoeidae]
- Alievium, Pessagno 1972 [Pseudoaulophacidae]
- Aligena, Lea 1843 [Lasaeidae]
- Aliger, Thiele 1929 [Strombidae]
- Alimbella, Andreeva 1960 [Anomalorthidae]
- Alinkioduncanella [Anthozoa]
- Aliodonax [Cardiida]
- Aliofusus, L. W. Stephenson 1941 [Buccinidae]
- Aliomactra, L. W. Stephenson 1953 [Mactridae]
- Aliquantula [Terebratellidae]
- Alisina, Rowell 1962 [Trematobolidae]
- Alisocrinus, Kirk 1929 [Monobathrida]
- Alispira [Atrypinidae]
- Alispirifer [Strophopleuridae]
- Alkenopterus [Eurypterida]
- Allagecrinus, Etheridge and Carpenter 1881 [Crinoidea]
- Allanella [Adolfiidae]
- Allanetes [Chonetidae]
- Allanicytidium [Mitrata]
- Allanoceras, Barskov 1959 [Spyroceratidae]
- Allantopora [Calloporidae]
- Alleinacin [Cardiida]
- Alleiolepis, Heller 1953 [Semionotiformes]
- Allelepidotus, Fric 1906 [Semionotiformes]
- Alleynia, Pocta 1902 [Laccophyllidae]
- Alleynodictyon, Webby 1971 [Aulaceratidae]
- Alliatina [Foraminifera]
- Alliatinella [Foraminifera]
- Alligaticeras [Perisphinctidae]
- Allionia, Michelotti 1861 [Comatulida]
- Alloberyx, Gaudant 1969 [Beryciformes]
- Allobodochus, Opik 1979 [Agnostida]
- Allobuchia [Pterioida]
- Allocatillocrinus, Wanner 1937 [Catillocrinidae]
- Allocentrotus [Echinoida]
- Alloceras [Oncocerida]
- Alloceratites, L. F. Spath 1934 [Ceratitidae]
- Allochiton [Ischnochitonidae]
- Allocoenia, Etallon 1858 [Actinastreidae]
- Allocosmia, Cossmann 1897 [Zygopleuridae]
- Allocotoceras, Teichert and Glenister 1953 [Endoceratidae]
- Allocrinus, Wachsmuth and Springer 1889 [Monobathrida]
- Allocrioceras, Spath 1926 [Anisoceratidae]
- Allocryptaspis [Pteraspidomorphes]
- Allocyrtium [Spumellaria]
- Allocystites [Diploporita]
- Allocythereis [Podocopida]
- Allograptus [Graptoloidea]
- Alloiteaucoenia, Beauvais 1964 [Stylinidae]
- Alloiteausmilia, Beauvais 1986 [Zardinophyllidae]
- Allolepidotus, Deecke 1889 [Panxianichthyidae]
- Allomactra, Tomlin 1931 [Mactridae]
- Allomera [Demospongea]
- Allomma [Hemicidaroidea]
- Allomorphina [Foraminifera]
- Allomorphinella [Foraminifera]
- Allonema [Eukaryota]
- Allonia, Doré and Reid 1965 [Chancelloriidae]
- Allonychia, E. O. Ulrich 1895 [Ambonychiidae]
- Allopagus [Cardiida]
- Allophyllum, Schouppe 1957 [Hapsiphyllidae]
- Allopiloceras, Ulrich and Foerste 1936 [Piloceratidae]
- Allopleuron, Baur 1888 [Cheloniidae]
- Allopora [Stylasterina]
- Alloprosallocrinus, Casseday and Lyon 1862 [Monobathrida]
- Alloptychites, L. F. Spath 1951 [Isculitidae]
- Allorhynchus [Allorhynchidae]
- Allosaccus [Demospongea]
- Allosmerus, Hubbs 1925 [Osmeriformes]
- Allosocrinus [Calceolispongiidae]
- Allosycocrinus, Wanner 1924 [Cladida]
- Allothrissops, Nybelin 1964 [Ichthyodectiformes]
- Allotoxaster [Spatangoida]
- Allotrioceras, Flower 1955 [Allotrioceratidae]
- Allotropiophyllum, Grabau 1928 [Hapsiphyllidae]
- Allozygocrinus, Witzke and Strimple 1981 [Diplobathrida]
- Allumettoceras, A. F. Foerste 1926 [Tripteroceratidae]
- Almaena [Foraminifera]
- Almaloceras [Oncocerida]
- Almascyllium, Cappetta 1980 [Orectolobiformes]
- Almerarhynchia [Cyclothyrididae]
- Almites, Toumansky 1941 [Marathonitidae]
- Almohadites [Cephalopoda]
- Almorhynchia [Basiliolidae]
- Alnifia [Pterioida]
- Alocaxis, Cossmann 1889 [Trypanaxidae]
- Alocolytoceras [Lytoceratidae]
- Alocopocythere [Podocopida]
- Alocospira, Cossmann 1899 [Olividae]
- Aloculatia [Palaeocopida]
- Alokistocare, Lorenz 1906 [Alokistocaridae]
- Alokistocarella, Resser 1938 [Alokistocaridae]
- Alomataspis, Opik 1967 [Trilobita]
- Alopias, Rafinesque 1810 [Alopiidae]
- Alosa, Linck 1790 [Clupeidae]
- Alosculum [Lychniscosa]
- Alpenachitina [Rhizopodea]
- Alpenoceras, Foerste 1927 [Discosoridae]
- Alphacyathus [Ajacicyathida]
- Alpicidaris [Cidaridae]
- Alpillina [Foraminifera]
- Alpinites, Bogoslovsky 1971 [Posttornoceratidae]
- Alpinophragmium, Flügel 1967 [Coscinophragmatidae]
- Alpinophyllia, Roniewicz 1989 [Alpinophylliidae]
- Alpinoseris, Roniewicz 1989 [Alpinophylliidae]
- Alsatites, Haug 1894 [Arietitidae]
- Alsopocrinus, Tansey 1922 [Cladida]
- Altaecypris [Palaeocopida]
- Altaeorthis, Severgina 1967 [Hesperorthidae]
- Altaepeltis, Maksimova 1968 [Corynexochida]
- Altaesajania, Maksimova 1978 [Phacopida]
- Altaestrophia [Douvillinidae]
- Altaethyrella, Severgina 1978 [Sphenotretidae]
- Altaicornus [Hyolithida]
- Altaicyathus [Kazakhstanicyathida]
- Altaiophyllum, Ivaniya 1955 [Streptelasmatidae]
- Altaipecten [Pterioida]
- Altaja, Zheltonogova 1960 [Entelophyllidae]
- Altajaharpes, Petrunina 1984 [Trilobita]
- Altajella, Kulkov 1962 [Xenomartiniidae]
- Altaspiratella [Limacinidae]
- Altasterella [Foraminifera]
- Alternatus, Ljaschenko 1969 [Uniconidae]
- Alternognathus [Conodontophorida]
- Altha [Podocopida]
- Altinerina [Milioliporidae]
- Altiocculus, Sunbe 1994 [Alokistocaridae]
- Altistoma [Foraminifera]
- Altitudella, Repina 1974 [Ptychopariidae]
- Altivasum [Neogastropoda]
- Altorthis, Severgina 1967 [unclassified genus]
- Altrix, Palmer 1942 [Fissurellidae]
- Altshedata [Cystoporata]
- Altudoceras, Ruzhencev 1940 [Paragastrioceratidae]
- Altunella [Tetralobulidae]
- Alula [Sanguinolitidae]
- Alurites, Ruzhencev and Bogoslovskaya 1975 [Reticuloceratidae]
- Aluta, Mathew 1896 [Beyrichonidae]
- Alutella [Comptalutidae]
- Alutera, Oken 1817 [Tetraodontiformes]
- Aluvarus, Bannikov and Tyler 1995 [Perciformes]
- Aluverina [Fenestrata]
- Aluveroceras [Actinocerida]
- Alvania, Risso 1826 [Rissoidae]
- Alvarezites [Athyrididae]
- Alveinus, Conrad 1865 [Kelliellidae]
- Alveocyclammina [Foraminifera]
- Alveolaria [Cyclostomata]
- Alveolella [Palaeocopida]
- Alveolina [Alveolinidae]
- Alveolinella [Alveolinidae]
- Alveolites, Lamarck 1801 [Alveolitidae]
- Alveolophragmium [Foraminifera]
- Alveopora, Blainville 1830 [Poritidae]
- Alveosepta, Hottinger 1967 [Hottingeritidae]
- Alveovalvulina [Foraminifera]
- Alvinia, Monterosato 1884 [Rissoidae]
- Alwynia [Notothyrididae]
- Alwynopora [Fenestrata]
- Alwynulus, Tripp 1967 [Phacopida]
- Alysidota [Cheilostomata]
- Alzonella [Foraminifera]
- Amaea, H. Adams and A. Adams 1853 [Epitoniidae]
- Amaea (Discoscala), Saccoa 1890 [Epitoniidae]
- Amalda, H. Adams and A. Adams 1853 [Olividae]
- Amalgamoprus [Fenestrata]
- Amaltheocrinus [Cyclocrinidae]
- Amaltheus, de Montfort 1808 [Amaltheidae]
- Amandaraia, Lavrusevich 1968 [Polycoeliidae]
- Amandophyllum, Heritsch 1941 [Durhaminidae]
- Amanses, Gray 1835 [Monacanthidae]
- Amaraphyllum, Pedder 1970 [Disphyllidae]
- Amarassites, O. Welter 1914 [Haloritidae]
- Amarophos, Woodring 1964 [Buccinidae]
- Amarsupiocrinus, Frest 1975 [Monobathrida]
- Amathia [Ctenostomata]
- Amaura, Moller 1842 [Heterostrophia]
- Amaurellina, Fischer 1885 [Ampullinidae]
- Amauroceras [Amaltheidae]
- Amauropsis, Mörch 1857 [Naticidae]
- Amauropsis (Prostylifer), Koken 1889 [Prostyliferidae]
- Amauropsona, Finlay and Marwick 1937 [Naticidae]
- Ambardella [Archaeorthidae]
- Amberleya, Morris and Lycett 1851 [Eucyclidae]
- Ambicocrinus, Kirk 1945 [Diplobathrida]
- Ambigostrea, N. Malchus 1990 [Ostreidae]
- Ambipleurus, Lambert 1932 [Temnopleuroida]
- Ambitropus [Foraminifera]
- Amblacrinus, Orbigny 1850 [Monobathrida]
- Amblyacrum, Cossmann 1889 [Turridae]
- Amblypneustes [Temnopleuridae]
- Amblypterina, Berg 1940 [Palaeonisciformes]
- Amblysiphonelloides [Sebargasiidae]
- Ambocardia [Cardiida]
- Ambocoelia, Hall 1860 [Ambocoeliidae]
- Ambocythere [Podocopida]
- Amboglossa [Ambocoeliidae]
- Ambolostoma, R. E. Peck 1930 [Spiraculata]
- Ambonlepidos [Turrilepadida]
- Ambonolium, Raymond 1924 [Illaenuridae]
- Ambonorthella [Rhipidomellidae]
- Ambonychia, Hall 1847 [Ambonychiidae]
- Ambostracon [Podocopida]
- Ambrolinevitus, Syssoiev 1958 [Sulcavitidae]
- Amecephalina, Poulson 1927 [Alokistocaridae]
- Amecephalus, Walcott 1924 [Alokistocaridae]
- Amecystis, Ulrich and Kirk 1921 [Pleurocystitidae]
- Amekichilus, Eames 1957 [Rostellariidae]
- Americardia, Stewart 1930 [Cardiidae]
- Americare, Lochman and Hu 1960 [Anomocarellidae]
- Americaspis [Pteraspidomorphes]
- Amerigobolbina [Palaeocopida]
- Amerirostra, Jeletzky 1969 [Sepiida]
- Amerista [Meristidae]
- Amerycina [Cardiida]
- Amgaspis, Juan and Zhao [Amgaspididae]
- Amginia, Pegel 1981 [Asaphida]
- Amginoerbia, Chernysheva 1967 [Corynexochida]
- Amginouyia, Chernysheva 1956 [Trilobita]
- Amiantis, Carpenter 1863 [Veneridae]
- Amiaspis, Lochmann 1944 [Lonchocephalidae]
- Amictocracens, Henderson and MacKinnon 1981 [Acrotretidae]
- Amicula, Gray 1847 [Mopaliidae]
- Amicus, Koroleva 1967 [Ptychopariida]
- Amiella [Anomalocarididae]
- Amiiformes, order, O. P. Hay 1929 [Actinopteri]
- Amijiella [Foraminifera]
- Amiopsis, Kner 1863 [Amiidae]
- Amiskwia [Problematica]
- Amissopecten [Septalariidae]
- Ammagnostus, Opik 1967 [Agnostidae]
- Ammatophora [Cheilostomata]
- Ammoastuta [Lituolidae]
- Ammobacularia [Haplophragmoiidae]
- Ammobaculites, Cushman 1910 [Haplophragmoiidae]
- Ammobaculoides [Foraminifera]
- Ammocycloculina [Foraminifera]
- Ammodiscella [Ammodiscidae]
- Ammodiscoides [Ammodiscidae]
- Ammodiscus, Reuss 1862 [Ammodiscidae]
- Ammoelphidiella [Foraminifera]
- Ammoglobigerina [Foraminifera]
- Ammolagena [Ammodiscidae]
- Ammomarginulina, Wiesner 1931 [Lituolidae]
- Ammonellipsites, Parkinson 1822 [Pericyclidae]
- Ammonia, Bruennich 1772 [Rotaliidae]
- Ammonicrinus [Sagenocrinida]
- Ammonitida, order, A. Hyatt 1889 [Cephalopoda]
- Ammonitina, suborder, A. Hyatt 1889 [Ammonitida]
- Ammonitina, order, A. Hyatt 1889 [unclassified order]
- Ammonitoceras [Ancyloceratidae]
- Ammonoceratites, Bowditch 1822 [Lytoceratidae]
- Ammonoidea, order, Zittel 1884 [Cephalopoda]
- Ammopalmula [Haplophragmoiidae]
- Ammoscalaria [Discamminidae]
- Ammosiphonia [Haplophragmoididae]
- Ammosphaeroidina [Foraminifera]
- Ammospirata [Foraminifera]
- Ammotium, Loeblich and Tappan 1953 [Haplophragmoiidae]
- Ammotrochoides [Foraminifera]
- Ammovertella [Miliolidae]
- Ammovertellina [Ammodiscidae]
- Ammovolummina [Ammodiscidae]
- Amnestostroma [Stromatoporoidea]
- Amniopora, Sokolov 1955 [Pyrgiidae]
- Amoebites [Cardioceratidae]
- Amoeboceras [Cardioceratidae]
- Amoenirhynchia [Prionorhynchiidae]
- Amoenospirifer [Adolfiidae]
- Amonilea, Cossrnann 1920 [Archaeogastropoda]
- Amonohexacrinus, Schevchenko 1967 [Monobathrida]
- Amonotis, Kittl 1904 [Posidoniidae]
- Amoraster [Spatangoida]
- Amorena [Neogastropoda]
- Amoria, Gray 1855 [Volutidae]
- Amorphognathus, Branson and Mehl 1933 [Balognathidae]
- Amosina [Strophochonetidae]
- Ampellatocephalina [Trilobita]
- Ampelocrinus, Kirk 1942 [Ampelocrinidae]
- Ampezzamilda [Heterostrophia]
- Ampezzoella [Coelostylinidae]
- Ampezzogyra, Bandel 1996 [Heterostrophia]
- Ampezzoscala, Bandel 1992 [Sorbeoconcha]
- Ampezzotrochus [Eucycloscalidae]
- Amphelia [Oculinidae]
- Ampheristocrinus, Hall 1879 [Cladida]
- Amphiaraus, Vokes 1946 [Astartidae]
- Amphiaulastrea, Geyer 1955 [Amphiastreidae]
- Amphiblestrella [Chaperiidae]
- Amphiblestrum, Gray 1848 [Calloporidae]
- Amphibrachium, Hertwig 1879 [Patulibracchiidae]
- Amphicervicis [Hemisphaeramminidae]
- Amphichaena [Cardiida]
- Amphiclina (Amphiclinodonta), Bittner 1888 [Koninckinidae]
- Amphiclinodonta (Bittner 1888) [Koninckinidae]
- Amphicoryna [Foraminifera]
- Amphicostella [Metacopida]
- Amphicrinus [Sagenocrinida]
- Amphictene [Terebellomorpha]
- Amphicyclia [Spumellaria]
- Amphicyrtoceras, Foerste 1924 [Acleistoceratidae]
- Amphicythere [Podocopida]
- Amphicytherura, E. A. Butler and D. E. Jones 1957 [Podocopida]
- Amphidesma [Cardiida]
- Amphidiscosa, order, Schrammen 1924 [Hexactinellida]
- Amphidonte, Fischer von Waldheim 1829 [Gryphaeidae]
- Amphigeisina [Protoconodontida]
- Amphigenia [Centronellidae]
- Amphigraptus [Graptoloidea]
- Amphijanira [Pterioida]
- Amphikegelites [Amphissitidae]
- Amphileberis [Podocopida]
- Amphilectella, Schrammen 1901 [Pleromatidae]
- Amphilichas, Raymond 1905 [Lichidae]
- Amphimenium, Haeckel 1881 [Larnacillidae]
- Amphimorphina [Foraminifera]
- Amphimorsoniella [Cyclostomata]
- Amphinomorpha, order [Polychaeta]
- Amphiocoelia, Hall 1867 [Ambonychiidae]
- Amphiperas, Herrmannsen 1846 [Ovulidae]
- Amphiperca, Weitzel 1933 [Perciformes]
- Amphipoda, order, Latreille 1816 [Malacostraca]
- Amphipora, Schulz 1883 [Amphiporidae]
- Amphiporella [Trepostomida]
- Amphipsalidocrinus, Weller 1930 [Cladida]
- Amphipsammus [Cardiida]
- Amphipyndax, Foreman 1966 [Amphipyndacidae]
- Amphisella [Palaeocopida]
- Amphisorus, Ehrenberg 1839 [Soritidae]
- Amphisphaera [Spumellaria]
- Amphissa, H. Adams and A. Adams 1853 [Columbellidae]
- Amphistegina [Amphisteginidae]
- Amphistegina [Podocopida]
- Amphistichus, Agassiz 1854 [Perciformes]
- Amphistrophia, Hall and Clarke 1892 [Amphistrophiidae]
- Amphistylus [Spumellaria]
- Amphithalamus, Carpenter 1864 [Barleeidae]
- Amphitomaria [Discohelicidae]
- Amphitomella [Diplospirellidae]
- Amphitoxotis [Palaeocopida]
- Amphitremoida [Saccamminidae]
- Amphitriscoelus, Harris and Hodson 1922 [Caprinuloideidae]
- Amphitrochus, Cossmann 1907 [Archaeogastropoda]
- Amphitryon, Hawle and Corda 1874 [Remopleurididae]
- Amphizona [Palaeocopida]
- Amphorachitina [Rhizopodea]
- Amphoracrinus, Austin 1848 [Monobathrida]
- Amphoracrocrinus, Moore and Strimple 1969 [Monobathrida]
- Amphoracystis [Diploporita]
- Amphoratheca [Foraminifera]
- Amphorella [Ptychopariida]
- Amphorellina [Spirotrichia]
- Amphorometra [Comatulida]
- Amphorosteus, Gibbes 1850 [Mosasauridae]
- Amphoton, Lorenz 1906 [Dolichometopidae]
- Amphotonella, Kobayashi 1942 [Corynexochida]
- Amplectoproductina [Foraminifera]
- Ampletochilina [Palaeocopida]
- Amplexiphyllum, Stumm 1949 [Stereolasmatidae]
- Amplexizaphrentis, Vaughan 1906 [Hapsiphyllidae]
- Amplexocarinia, Soshkina 1928 [Laccophyllidae]
- Amplexograptus [Diplograptidae]
- Amplexoides, Wang 1947 [Amplexidae]
- Amplexopora [Trepostomida]
- Amplexus, Sowerby 1814 [Amplexidae]
- Amplosipho [Neogastropoda]
- Amplostoma, Stoliczka 1868 [Planaxidae]
- Ampthillia [Cephalopoda]
- Ampulla, Roding 1798 [Volutidae]
- Ampullella, Cox 1931 [Ampullinidae]
- Ampullina, Férussac 1822 [Ampullinidae]
- Ampullinopsis, Conrad 1865 [Ampullinidae]
- Ampullospira, Harris 1897 [Ampullinidae]
- Ampuloides [Pachydomellidae]
- Ampurocrinus [Diplobathrida]
- Ampyx, Dalman 1827 [Raphiophoridae]
- Ampyxella, Dean 1960 [Raphiophoridae]
- Ampyxina, Ullrich 1922 [Raphiophoridae]
- Ampyxinella, Korleva 1959 [Raphiophoridae]
- Amquia, Rasseti 1946 [Ptychopariida]
- Amsassia, Sokolov and Mironova 1959 [Cryptolichenariidae]
- Amsassipora [Trepostomida]
- Amsdenella [Hebetoechiidae]
- Amsdenina [Gypidulidae]
- Amsdenoides, Sutherland 1965 [Amsdenoididae]
- Amsdenostrophiella [Amphistrophiidae]
- Amuletum, L. W. Stephenson 1941 [Turridae]
- Amurodictya, Romanchuk 1979 [Cryptostomata]
- Amuropecten [Pterioida]
- Amussiopecten, Sacco 1897 [Pectinidae]
- Amyclina, Iredale 1918 [Nassariidae]
- Amydaicornus [Hyolithida]
- Amydrotaxis [Conodontophorida]
- Amygdalella [Palaeocopida]
- Amygdalocystites, Billings 1854 [Amygdalocystitidae]
- Amygdalophyllidium, Kato and Minato 1974 [Pseudopavonidae]
- Amygdalophylloides, Dobrolyubova and Kabakovich 1948 [Geyerophyllidae]
- Amygdalophyllum, Dun and Benson 1920 [Aulophyllidae]
- Amygdalotheca [Cornuta]
- Amygdalum, Megerle 1811 [Mytilidae]
- Amylodon, Storms 1894 [Chimaeriformes]
- Amyssodropa [Neogastropoda]
- Amzasskiella, Poletaeva 1960 [Ptychopariida]
- Anabaia [Leptocoeliidae]
- Anabaraceps, Repina 1972 [Redlichiida]
- Anabaraspis, Lermontova 1951 [Redlichiida]
- Anabaraspis, Lermontova 1951 [Ptychopariida]
- Anabaria [Atrypinidae]
- Anabaricornus [Hyolithida]
- Anabarochilina [Ostracoda]
- Anabolotreta, Rowell and Henderson 1978 [Acrotretidae]
- Anacaenaspis, Bruton 1967 [Odontopleuridae]
- Anacheirurus, Reed 1896 [Pilekiidae]
- Anachis, H. Adams and A. Adams 1853 [Columbellidae]
- Anacithara [Neogastropoda]
- Anacleoniceras [Cephalopoda]
- Anaclitacanthus, St. John and Worthen 1875 [Ctenacanthiformes]
- Anaconularia [Scyphozoa]
- Anacopodia [Trilobita]
- Anactolasma [Anthozoa]
- Anadara, Gray 1847 [Arcidae]
- Anadara (Tosarca), Noda 1965 [Arcidae]
- Anaethalion, White 1938 [Elopidae]
- Anafesta (M. A. Fedonkin 1984) [Triradialomorpha]
- Anagaudryceras, Shimizu 1934 [Gaudryceratidae]
- Anagymnites, A. Hyatt 1900 [Gymnitidae]
- Anagymnotoceras, F. H. McLearn 1946 [Beyrichitidae]
- Anahamulina, Hyatt 1900 [Hamulinidae]
- Anahoplites [Hoplitidae]
- Anahuacia [Rectonariidae]
- Anakinetica [Terebratellidae]
- Anaklinoceras, Stephenson 1941 [Nostoceratidae]
- Anakrusa, Nazarov 1977 [Anakrusidae]
- Analectis, Daniltshenko 1980 [Lampridiformes]
- Analocaspis, Owens 1970 [Proetidae]
- Analox, Rasetti 1966 [Weymouthiidae]
- Analytoceras [Lytoceratidae]
- Anamesoceras [Discosorida]
- Anamesocrinus, Goldring 1923 [Crinoidea]
- Ananorites, C. Diener 1907 [Noritidae]
- Ananterodonta [Modiomorphida]
- Anapachydiscus, Yabe and Shimizu 1926 [Pachydiscidae]
- Anapagurus, Henderson 1886 [Paguridae]
- Anapepta, Finlay 1930 [Cancellariidae]
- Anaphragma, Ulrich and Bassler 1904 [Amplexoporidae]
- Anapteris, Van Winkle 1919 [Corbulidae]
- Anaptopora [Cheilostomata]
- Anaptyctocyathus [Ajacicyathida]
- Anarcestes, Mojsisovics 1882 [Anarcestidae]
- Anarcestida, order [Cephalopoda]
- Anarchocrinus, Jaekel 1918 [Cladida]
- Anarosaurus, Dames 1890 [Eosauropterygia]
- Anarrhichthys, Ayres 1855 [Perciformes]
- Anarthropora [Adeonidae]
- Anartiocrinus, Kirk 1940 [Cladida]
- Anascaphites [Scaphitidae]
- Anasibirites, E. v. Mojsisovics 1896 [Prionitidae]
- Anasirenites, E. v. Mojsisovics 1893 [Trachyceratidae]
- Anaspidea, order, P. Fischer 1883 [Gastropoda]
- Anaspyroceras, S. Shimizu and T. Obata 1935 [Dawsonoceratidae]
- Anastes [Archaeogastropoda]
- Anastomoceras, Flower 1939 [Spyroceratidae]
- Anastomopora [Fenestrata]
- Anastrophia, Hall 1867 [Parastrophinidae]
- Anastrophognathus [Conodontophorida]
- Anathyrella [Athyrididae]
- Anathyris [Athyrididae]
- Anatibetites, E. v. Mojsisovics 1896 [Tibetitidae]
- Anaticinella [Foraminifera]
- Anatiferopsis [Mitrata]
- Anatifopsis, Barrande 1872 [Kirkocystidae]
- Anatimya, Conrad 1860 [Laternulidae]
- Anatina, Schumacher 1817 [Anatinellidae]
- Anatipopecten, Hertlein 1936 [Pectinidae]
- Anatolepsis [Pteraspidomorphes]
- Anatoma, Woodward 1859 [Anatomidae]
- Anatomites, E. v. Mojsisovics 1893 [Haloritidae]
- Anatreta [Ephippelasmatidae]
- Anatrypa [Atrypidae]
- Anatsabites, Ruzhencev 1957 [Paragastrioceratidae]
- Anaulocidaris [Miocidaridae]
- Anavirgatites [Cephalopoda]
- Anazola, Gray 1853 [Olividae]
- Anazyga, Davidson 1882 [Anazygidae]
- Anbullina [Neogastropoda]
- Ancalocrinus, Webster and Lane 1987 [Monobathrida]
- Anceps [Archaeogastropoda]
- Anchicrinus, Strimple and Watkins 1969 [Laudonocrinidae]
- Anchigonites [Gonambonitidae]
- Anchiopella, Reed 1907 [Calmoniidae]
- Anchiopsis, Delo 1935 [Dalmanitidae]
- Anchispirocyclina [Foraminifera]
- Anchistrocheles [Podocopida]
- Anchoa, Jordan and Evermann 1927 [Clupeiformes]
- Anchomasa, Leach 1852 [Pholadidae]
- Anchura, Conrad 1860 [Aporrhaidae]
- Ancilla, Lamarck 1799 [Olividae]
- Ancillarina, Bellardi 1882 [Neogastropoda]
- Ancillina, Bellardi 1882 [Olividae]
- Ancillista, Iredale 1936 [Olividae]
- Ancillopsis [Olividae]
- Ancillotoechia, Havlicek 1959 [Trigonirhynchiidae]
- Ancistrocrania, Dall 1877 [Craniidae]
- Ancistrocrinus [Sagenocrinida]
- Ancistrolepis, Dall 1895 [Buccinidae]
- Ancistromesus, Dall 1871 [Patellidae]
- Ancistrorhyncha, Ulrich and Cooper 1942 [Ancistrorhynchidae]
- Ancistrosyrinx, Dall 1881 [Turridae]
- Ancliffia [Cardiida]
- Anclyoceras [Cephalopoda]
- Ancolioceras [Graphoceratidae]
- Ancoracrinus [Sagenocrinida]
- Ancoradella [Conodontophorida]
- Ancorellina [Thecideidae]
- Ancorhynchia [Wellerellidae]
- Anculosa, Say 1821 [Pleuroceridae]
- Ancylocidaris [Diadematoida]
- Ancylostrophia [Douvillinidae]
- Ancyrochitina [Rhizopodea]
- Ancyrocrinus, Hall 1862 [Cladida]
- Ancyrodella [Conodontophorida]
- Ancyrognathus [Conodontophorida]
- Ancyrolepis [Conodontophorida]
- Ancyropyge, Clark 1891 [Styginidae]
- Ancyropyge [Odontopleurida]
- Andalucinetes [Strophochonetidae]
- Andalusiana, Lotze 1958 [Holmiidae]
- Andamookia [Foraminifera]
- Andemantastraea, Alloiteau 1951 [Andemantastraeidae]
- Andenothyone [Dendrochirotida]
- Anderkenia [Pterioida]
- Andersenia [Foraminifera]
- Andersenolina [Foraminifera]
- Andersonites [Cephalopoda]
- Anderssonella, Kobayashi 1936 [Saukiidae]
- Anderssonoceras, Grabau 1924 [Anderssonoceratidae]
- Andesites [Cephalopoda]
- Andiceras [Neocomitidae]
- Andicula [Turridae]
- Andinacaste, Eldredge and Ormiston 1979 [Calmoniidae]
- Andinodesma [Pholadomyida]
- Anditrigonia [Trigoniida]
- Andivaugonia [Trigoniida]
- Andobolus [Problematica]
- Andonia, Bellardi 1872 [Neogastropoda]
- Andorina, Lorenthey 1901 [Leucosiidae]
- Andrarina, Raymond 1937 [Andrarinidae]
- Andrazella, Cuif 1976 [Procyclolitidae]
- Andreaea, Schrammen 1902 [Cribrospongiidae]
- Andreaspira [Spiriferidae]
- Andreioceras [Discosorida]
- Andrejella [Foraminifera]
- Andreolepis, Gross 1968 [Osteichthyes]
- Andriopora [Cheilostomata]
- Androgynoceras [Liparoceratidae]
- Andromeda [Amphipyndacidae]
- Androsina [Soritidae]
- Andrusella, Korobkov 1954 [Mactridae]
- Andrusovicardium [Cardiida]
- Anebocythereis [Podocopida]
- Anebolithus, Huges and Wright 1970 [Trinucleidae]
- Aneisohealdia [Podocopida]
- Anelotreta, Pelman 1986 [Acrotretidae]
- Anemetocrinus, Wright 1938 [Cladida]
- Anemocephalops, Ivshin 1962 [Ptychopariida]
- Anemocephalus, Ivshin 1955 [Ptychopariida]
- Anepheloceras [Nautilida]
- Anetoceras, Schindewolf 1934 [Mimosphinctidae]
- Aneuretoceras [Collignoniceratidae]
- Aneurystoma, Cossmann 1899 [Cancellariidae]
- Anfaceras [Ceratitida]
- Anfedatia [Ostracoda]
- Angaraspis [Pteraspidomorphes]
- Angarella, Asatkin 1932 [Acrotretida]
- Angaria, Röding 1798 [Turbinidae]
- Angaricyathus [Ajacicyathida]
- Angarocaris [Merostomata]
- Angastobactrites [Anarcestida]
- Angelina, Salter 1859 [Olenidae]
- Angelinoceras, Hyatt 1894 [Lituitidae]
- Angeliphyllia, Barta-Calmus 1973 [Merulinidae]
- Angelopora [Cheilostomata]
- Angioblastus, J. Wanner 1931 [Fissiculata]
- Angiospirifer [Choristitidae]
- Anglaspis [Pteraspidomorphes]
- Angliaecytheridea [Podocopida]
- Anglicornus, Flower and Caster 1935 [Brevicoceratidae]
- Anglidiscus, Regnéll 1950 [Hemicystitidae]
- Angochitina [Rhizopodea]
- Angolosaurus, Fitzsimons 1953 [Mosasauridae]
- Angotia [Foraminifera]
- Angranoceras (Sheng 1978) [Mongoloceratidae]
- Anguilla, Schrank 1798 [Anguilliformes]
- Anguillavus, Hay 1902 [Anguilliformes]
- Anguilliformes, order, P. H. Greenwood et al. 1966 [Actinopteri]
- Anguilloides, Cadrobbi 1962 [Anguilloididae]
- Anguipecten [Pectinidae]
- Anguisia [Cyclostomata]
- Angulaticeras [Schlotheimiidae]
- Angullophyllum, McLean 1974 [Arachnophyllidae]
- Angulobracchia, Baumgartner 1980 [Angulobracchiidae]
- Angulocrinus [Millericrinida]
- Angulodiscus, Kristan 1957 [Involutinidae]
- Angulodus [Conodontophorida]
- Angulogavelinella [Foraminifera]
- Angulogerina, Williamson 1858 [Rotaliina]
- Angulotreta, Palmer 1954 [Acrotretidae]
- Angulus, Megerle 1811 [Tellinidae]
- Angustaeva, Hupé 1953 [Ptychopariida]
- Angusticardinia, Schuchert and Cooper 1931 [Angusticardiniidae]
- Angusticardo [Cardiida]
- Angusticornus [Hyolithida]
- Angustiphyllum, Altevogt 1965 [Streptelasmatidae]
- Angustothyris [Angustothyrididae]
- Anhelkocephalon [Isopoda]
- Anhuiaspis, Qian and Qiu 1983 [Kaolishaniidae]
- Anhuiceras [Ellesmerocerida]
- Anhuiella [Sabelliditida]
- Anictosphaera [Psammosphaeridae]
- Anidanthus [Linoproductidae]
- Anisactinella [Diplospirellidae]
- Anisarcestes, Kittl 1908 [Arcestidae]
- Anisastraea [Scleractinia]
- Anisocardia, Munier-Chalmas 1863 [Arcticidae]
- Anisoceras, Pictet 1854 [Anisoceratidae]
- Anisocerasites [Eunicemorpha]
- Anisochilina, Teichert 1937 [Leperditiidae]
- Anisocidaris [Psychocidaridae]
- Anisocoenia, Reuss 1867 [Faviidae]
- Anisocorbula, Iredale 1930 [Corbulidae]
- Anisocrinus [Sagenocrinida]
- Anisocyamus [Podocopida]
- Anisodonta, Deshayes 1858 [Sportellidae]
- Anisograptus, Ruedemann 1937 [Dendroidea]
- Anisomyon, Meek and Hayden 1860 [Siphonariidae]
- Anisonotella, Whittington 1965 [Raphiophoridae]
- Anisophyllum, Milne-Edwards and Haime 1850 [Anisophyllidae]
- Anisopleurella, Cooper 1956 [Sowerbyellidae]
- Anisotremus [Pomadasyidae]
- Anisotrypa [Trepostomida]
- Ankhelasma, Sando 1961 [Zaphrentoididae]
- Ankinatsytes, Collignon 1965 [Nostoceratidae]
- Ankitokazocaris [Concavicarididae]
- Ankoura, Resser 1938 [Kingstoniidae]
- Ankumia [Platycopida]
- Ankyloceras, Zhuravleva 1974 [Karoceratidae]
- Ankylophorus [Pachycormiformes]
- Annachlamys, Iredale 1939 [Pectinidae]
- Annaecoelia, Senowbari-Daryan 1978 [Annaecoeliidae]
- Annamitella, Mansuy 1920 [Leiostegiidae]
- Annamitia, Mansuy 1916 [Alokistocaridae]
- Annectina, Suleymanov 1963 [Ammodiscidae]
- Annectocyma [Annectocymidae]
- Annepona, Schilder 1930 [Cypraeidae]
- Anningella, Cox 1958 [Buchiidae]
- Annoceras, Flower 1964 [Ellesmeroceratidae]
- Annulinectes [Pterioida]
- Annuloceras, Murphy et al. 1995 [Aegocrioceratidae]
- Annulocibicides [Foraminifera]
- Annulocyathella [Ajacicyathida]
- Annulocyathus [Ajacicyathida]
- Annulofrondicularia [Foraminifera]
- Annulofungia [Ajacicyathida]
- Annulopatellina [Annulopatellinidae]
- Annunziopora [Trepostomida]
- Anobasicrinus, Strimple 1961 [Anobasicrinidae]
- Anodontia, Link 1807 [Lucinidae]
- Anodontopleura, Felix 1891 [Hippuritida]
- Anodontopsis, McCoy 1851 [Allodesmatidae]
- Anofia [Cardiida]
- Anolcites, E. v. Mojsisovics 1893 [Trachyceratidae]
- Anolotichia, Ulrich 1890 [Ceramoporidae]
- Anomactinella [Diplospirellidae]
- Anomalinella [Foraminifera]
- Anomalinoides, Brotzen 1942 [Heterolepidae]
- Anomalisipho [Neogastropoda]
- Anomalocardia, Schumacher 1817 [Veneridae]
- Anomalocaris [Anomalocarididae]
- Anomaloceras, Hyatt 1884 [Rutoceratidae]
- Anomalocrinus, Meek and Worthen 1868 [Crinoidea]
- Anomalocystites, Hall 1858 [Mitrata]
- Anomalodiscus [Veneridae]
- Anomalodonta, S.A. Miller 1874 [Ambonychiidae]
- Anomalofusus, B. Wade 1916 [Fasciolariidae]
- Anomaloglossa [Obolidae]
- Anomalograptus [Graptoloidea]
- Anomalokellia [Cardiida]
- Anomalomya [Sacoglossa]
- Anomalopleuroides [Pholadomyida]
- Anomalopsis [Squamata]
- Anomalorthis, Ulrich and Cooper 1936 [Anomalorthidae]
- Anomalotoechus, Duncan 1939 [Trepostomida]
- Anomastraea, Marenzeller 1901 [Siderastreidae]
- Anomeioceras, Foerste 1930 [Acleistoceratidae]
- Anomia (Patro), Gray 1850 [Anomiidae]
- Anomianella, Ryckholt 1851 [Anomiidae]
- Anommatocyther [Podocopida]
- Anomocare, Angelin 1854 [Asaphida]
- Anomocarella, Walcott 1905 [Anomocarellidae]
- Anomocarina, Lermontova 1940 [Asaphida]
- Anomocarioides, Lermontova 1940 [Asaphida]
- Anomocariopsis, Sivov 1955 [Asaphida]
- Anomoclonella [Demospongea]
- Anomocytheridea [Podocopida]
- Anomoeodus, Forir 1887 [Pycnodontidae]
- Anomopora [Scleractinia]
- Anomorphites, Kolb 1910 [Pleromatidae]
- Anomotodon, Arambourg 1952 [Mitsukurinidae]
- Anonymoceras [Oncocerida]
- Anopaea, Eichwald 1861 [Inoceramidae]
- Anopisthodon [Trigoniida]
- Anoplia [Anopliidae]
- Anopliopsis [Anopliidae]
- Anoploceras, Hyatt and Zittel 1900 [Tainoceratidae]
- Anoplotheca [Anoplothecidae]
- Anopocodia, Opik 1967 [Ptychopariida]
- Anopolenus, Salter 1864 [Centropleuridae]
- Anoria, Walcott 1924 [Dolichometopidae]
- Anornithopora [Cribrilinidae]
- Anorthopygus [Anorthopygidae]
- Anostylostroma, Parks 1936 [Tienodictyidae]
- Anotoceras, Hyatt 1900 [Otoceratidae]
- Anotopora [Cheilostomata]
- Anoxypristis, White and Moy-Thomas 1941 [Pristidae]
- Ansates, Sowerby 1839 [Patellogastropoda]
- Ansella [Conodontophorida]
- Antacaroceras [Ellesmerocerida]
- Antactinodion [Nuculida]
- Antagmopleura, Lermontova 1960 [Trilobita]
- Antagmus, Resser 1936 [Antagmidae]
- Antalis, H. Adams and A. Adams 1854 [Dentaliidae]
- Antalyna [Foraminifera]
- Antarcticella [Foraminifera]
- Antarctidromia, Forster 1985 [Homolodromiidae]
- Antarctissa, Petrushevskaya 1967 [Lophophaenidae]
- Antarctodarwinella, Zinsmeister 1976 [Struthiolariidae]
- Antarctomithrax, R. Feldmann 1994 [Homolidae]
- Antatlaeva, Hupé 1960 [Trilobita]
- Antatlasia, Hupe 1952 [Ptychopariida]
- Anteglosia, Vokes 1948 [Eulimidae]
- Anteglossia (Vokes 1948) [Neotaenioglossa]
- Antelocoelia, Isaacson 1977 [Atrypida]
- Antennarius, Lacépède 1798 [Lophiiformes]
- Antepepta [Neogastropoda]
- Antetrichomya, Iredale 1951 [Mytilidae]
- Anthaspidella, Ulrich and Everett 1889 [Anthaspidellidae]
- Anthemocrinus, Wachsmuth and Springer 1881 [Diplobathrida]
- Antheria, Wu and Zhao 1974 [Petalaxidae]
- Antherolites, Sokolov 1955 [Multisoleniidae]
- Anthoblastus, J. Wanner 1924 [Fissiculata]
- Anthoceras, Teichert and Glenister 1954 [Proterocameroceratidae]
- Anthochitina [Rhizopodea]
- Anthocyrtidium, Haeckel 1881 [Pterocorythidae]
- Anthocyrtis [Nassellaria]
- Anthocyrtoma [Nassellaria]
- Anthograptus, Tsegelnjuk 1976 [Graptoloidea]
- Antholites, Davis 1887 [Micheliniidae]
- Anthomorpha [Archaeocyathida]
- Anthomorpha [Oncocerida]
- Anthonya, Gabb 1864 [Crassatellidae]
- Anthospyris, Haeckel 1881 [Triospyrididae]
- Anthozoa, class, Ehrenberg 1834 [Cnidaria]
- Anthracaris [Mysidacea]
- Anthracocaris [Anthracocarididae]
- Anthracoceras (Frech 1899) [Anthracoceratidae]
- Anthracoceratites, Ramsbottom 1970 [Dimorphoceratidae]
- Anthracoceratoides, Ramsbottom 1970 [Anthracoceratidae]
- Anthracomedusa [Carybdeida]
- Anthracophausia [Eocaridacea]
- Antiaechmia [Palaeocopida]
- Antiarcha, order, Cope 1885 [Placodermi]
- Antibythocypris [Podocopida]
- Anticlimax, Pilsbry and McGinty 1946 [Vitrinellidae]
- Anticonulus, Cossmann 1918 [Trochidae]
- Anticostiella [Palaeocopida]
- Anticythereis [Podocopida]
- Antigona, Schumacher 1817 [Veneridae]
- Antigonia, Lowe 1843 [Caproidae]
- Antigoniarcula, Elliot 1959 [Terebratulida]
- Antiguamya [Myoida]
- Antiguraleus [Neogastropoda]
- Antigyroceras [Discosorida]
- Antihomocrinus, Schmidt 1934 [Cladida]
- Antijanira [Pterioida]
- Antikinkaidia, Fedorowski 1973 [Pentaphyllidae]
- Antillaster [Asterostomatidae]
- Antillia, Duncan 1863 [Merulinidae]
- Antillocaprina, Trechmann 1924 [Antillocaprinidae]
- Antillocyathus, Wells 1937 [Caryophylliidae]
- Antillophos, Woodring 1928 [Buccinidae]
- Antillophyllia, Vaughan 1932 [Faviidae]
- Antillosarcolites, Chubb 1968 [Antillocaprinidae]
- Antilloseris, Vaughan 1905 [Calamophylliidae]
- Antimelatoma, Powell 1942 [Turridae]
- Antimitra [Neogastropoda]
- Antineosteus, Lelievre 1984 [Arthrodiriformes]
- Antinodulus, Cossmann and Peyrot 1919 [Iravadiidae]
- Antinomia, Catullo 1851 [Pygopidae]
- Antipatharia, order [Anthozoa]
- Antipecten [Pterioida]
- Antiphragmoceras, Foerste 1925 [Westonoceratidae]
- Antiplanes [Turridae]
- Antiplectoceras, Foerste and Savage 1927 [Barrandoceratidae]
- Antiptychina [Zeilleriidae]
- Antiquatonia, Miloradovich 1945 [Productidae]
- Antiquicyprina, Casey 1952 [Arcticidae]
- Antiquilima, Cox 1943 [Limidae]
- Antirhynchonella, Oehlert 1887 [Clorindidae]
- Antischmidtella [Palaeocopida]
- Antisolarium, Finlay 1927 [Trochidae]
- Antispirifer [Hysterolitidae]
- Antistrix [Meganterididae]
- Antistrixia [Rhynchonellida]
- Antizafra [Neogastropoda]
- Antizygospira [Atrypinidae]
- Antliodus, Newberry and Worthen 1866 [Petalodontidae]
- Antofagastaichthys, Arratia 1986 [Elopiformes]
- Antognathus [Conodontophorida]
- Antohipponicharion, Huo and Shu 1985 [Archaeocopida]
- Antoneila [Arcida]
- Antoniocoscinus [Ajacicyathida]
- Antonoceras, Shimanskiy 1957 [Oncocerida]
- Antracophyllum [Anthozoa]
- Antrimpos, Munster 1839 [Penaeidae]
- Antrispongia [Hexactinellida]
- Antropora, Norman 1903 [Antroporidae]
- Antutitrigonia [Trigoniida]
- Anulatrypa [Atrypidae]
- Anulipecten, Ruzicka et al. 1959 [Pterinopectinidae]
- Anulocrinus, Ramsbottom 1961 [Crinoidea]
- Anuloides, Ivshin 1962 [Ptychopariida]
- Anulostrea, Vialov 1936 [Ostreidae]
- Anx [Obolidae]
- Anzalia, Termier 1947 [Problematica]
- Aojia, Kobayashi 1935 [Lisaniidae]
- Aorocrinus, Wachsmuth and Springer 1897 [Batocrinidae]
- Aostipora, Vinassa de Regny 1921 [Trematoporidae]
- Aotagnostus, Opik 1979 [Agnostida]
- Aoteadrillia, Powell 1942 [Turridae]
- Apachia, Frederickson 1949 [Dokimocephalidae]
- Aparchitella [Palaeocopida]
- Aparchitellina [Palaeocopida]
- Aparchites [Palaeocopida]
- Aparchitocythere [Podocopida]
- Apataxia, Laseron 1956 [Rissoidae]
- Apatella [Conodontophorida]
- Apateloschizocythere [Podocopida]
- Apateopholis [Ichthyotringidae]
- Apatobolbina, Ulrich and Bassler 1923 [Beyrichiidae]
- Apatobolus [Obolidae]
- Apatochilina [Palaeocopida]
- Apatocythere [Podocopida]
- Apatognathus [Conodonta]
- Apatokephalina, Sivov 1955 [Remopleurididae]
- Apatokephaloides, Raymond 1924 [Remopleurididae]
- Apatokephalops, Lu 1975 [Remopleurididae]
- Apatokephalus, Brögger 1896 [Remopleurididae]
- Apatomorpha [Leptellinidae]
- Apatopygus, Hawkins 1920 [Apatopygidae]
- Apatoskenidioides [Orthida]
- Apatotervia [Cyclostomata]
- Apelismilia [Scleractinia]
- Apertauroria [Foraminifera]
- Apertirhynchella [Wellerellidae]
- Apertostella [Fenestrata]
- Aphaea [Cardiida]
- Aphanaia, Koninck 1877 [Atomodesmatidae]
- Aphanepygus, Bassini 1879 [Amiiformes]
- Aphanites [Goniatitida]
- Aphanomena, J. Bergstrom 1968 [Leptostrophiidae]
- Aphanoptyxis, Cossmann 1896 [Heterostrophia]
- Aphanotaenia [Heterostrophia]
- Apheathyris [Athyridida]
- Aphelaspis, Resser 1935 [Aphelaspididae]
- Aphelecrinus, Kirk 1944 [Aphelecrinidae]
- Aphelocythere [Podocopida]
- Aphelognathus [Conodonta]
- Apheloides, Ivshin 1962 [Aphelaspididae]
- Aphelolepis, Heller 1953 [Semionotiformes]
- Aphelotreta, Rowell 1980 [Acrotretidae]
- Apheoorthina, Havlí?ek 1949 [Eoorthidae]
- Apheoorthis, Ulrich and Cooper 1936 [Eoorthidae]
- Aphera, H. Adams and A. Adams 1854 [Cancellariidae]
- Aphia, Risso 1826 [Perciformes]
- Aphlebospongia [Pharetronida]
- Aphragmites, Barrande 1865 [Ascoceratidae]
- Aphraxonia, Uensalaner 1951 [Disphyllidae]
- Aphrikanecythere [Podocopida]
- Aphrocallistes, Gray 1858 [Aphrocallistidae]
- Aphrodina, Conrad 1869 [Veneridae]
- Aphroelasma [Anthozoa]
- Aphroidophyllum, Lenz 1961 [Ptenophyllidae]
- Aphrophylloides, Pickett 1967 [Aphrophyllidae]
- Aphrophyllum, Smith 1920 [Aphrophyllidae]
- Aphrosalpinx [Aphrosalpingidae]
- Aphyctoceras [Oncocerida]
- Aphyllum, Soshkina 1937 [Tryplasmatidae]
- Apicaria, Kutassy 1937 [Maturifusidae]
- Apicilirella [Chilidiopsidae]
- Apiocardia, Olsson 1961 [Cardiidae]
- Apioceras, Fahrenkohl 1844 [Oncocerida]
- Apiocrinites, Miller 1821 [Apiocrinitidae]
- Apiocypraea, Schilder 1927 [Eocypraeidae]
- Apiocystites, Forbes 1848 [Rhombifera]
- Apiograptus [Graptoloidea]
- Apionicon [Cyclidae]
- Apiotoma, Cossmann 1889 [Neogastropoda]
- Apiotrigonia, Cox 1952 [Megatrigoniidae]
- Apleuroceras, A. Hyatt 1900 [Aplococeratidae]
- Aplexura, Rozova 1963 [Liostracinidae]
- Aploceras, d'Orbigny 1849 [Carbactinoceratidae]
- Aplococeras, A. Hyatt 1900 [Aplococeratidae]
- Aplocus [Archaeogastropoda]
- Aplocyathus, d'Orbigny 1849 [Scleractinia]
- Aplodinotus, Rafinesque 1818 [Sciaenidae]
- Aplophyllia, D'Orbigny 1849 [Stylinidae]
- Aplosmilia, d'Orbigny 1849 [Rhipidogyridae]
- Aplosphecion [Pharetronida]
- Aplotaspis, Henderson 1976 [Ceratopygidae]
- Aplousina, Canu and Bassler 1927 [Calloporidae]
- Aplustrum, Schumacher 1817 [Aplustridae]
- Aplysinofibra [Demospongea]
- Apocalymene, Chatterton and Campbell 1980 [Calymenidae]
- Apocrinoceras, Teichert and Glenister 1954 [Protocycloceratidae]
- Apocyathus [Cribricyathea]
- Apodactylocrinus [Sagenocrinida]
- Apodasmocrinus, Warn and Strimple 1977 [Crinoidea]
- Apoderoceras [Coeloceratidae]
- Apogon, Lacépède 1802 [Apogonidae]
- Apogonoides, Bleeker 1849 [Perciformes]
- Apographiocrinus, Moore and Plummer 1940 [Apographiocrinidae]
- Apolectus, Cuvier and Valenciennes 1831 [Perciformes]
- Apollonorthis [Plectorthidae]
- Apolymetis, Salisbury 1929 [Tellinidae]
- Apomatella, Schuchert and Cooper 1931 [Clitambonitidae]
- Apomodocia, Hu 1971 [Ptychopariida]
- Apopentamerus [Pentameridae]
- Apoplanias, Lochmann 1964 [Olenidae]
- Aporolepas, Withers 1953 [Scalpellidae]
- Aporosocyathus [Ajacicyathida]
- Aporrhais, da Costa 1778 [Aporrhaidae]
- Aporthophyla, Ulrich and Cooper 1938 [Taffiidae]
- Aporthophylina, Ulrich and Cooper 1936 [Taffiidae]
- Aposolenopleura, Raymond 1937 [Ptychopariida]
- Apousiella [Mucrospiriferidae]
- Apoxypetalum [Spatangoida]
- Appalachignathus [Conodontophorida]
- Appendicysta, Hahn and Yuan 1989 [Proetida]
- Appisania [Neogastropoda]
- Applinocrinus, Peck [Saccocomidae]
- Aprathia, Hahn and Brauckmann 1975 [Proetida]
- Apricardia, Guéranger 1853 [Requieniidae]
- Apringia [Basiliolidae]
- Apsendesia [Frondiporidae]
- Apsidoceras, Hyatt 1884 [Apsidoceratidae]
- Apsilingula, Williams 1977 [Lingulidae]
- Apsilus, Cuvier and Valenciennes 1830 [Perciformes]
- Apsocalymma [Orthotetidae]
- Apsopelix [Crossognathiformes]
- Apsorroceras [Cephalopoda]
- Apsotreta, Palmer 1954 [Acrotretidae]
- Apterrinella [Cornuspiridae]
- Aptilechinus [Echinocystitoida]
- Aptocyathella [Ajacicyathida]
- Aptocyathus [Ajacicyathida]
- Aptychodon, Reuss 1855 [Sauropterygia]
- Aptycholathyrus, Cossmann and Pissarro 1905 [Fasciolariidae]
- Aptychopsis [Malacostraca]
- Aptyxiella, P. Fischer 1885 [Nerinellidae]
- Aptyxis, Troschel 1865 [Fasciolariidae]
- Apulites, Tavani 1958 [Radiolitidae]
- Apurocrinus, McIntosh 1981 [Diplobathrida]
- Aquilofusus, Kautsky 1925 [Fasciolariidae]
- Aquilonites, Kusina 1974 [Intoceratidae]
- Aquitanastraea, Chevalier 1954 [Faviidae]
- Aquitanophyllia [Mussidae]
- Arabella, Montagu 1804 [Eunicemorpha]
- Arabellites [Eunicemorpha]
- Arabia, Pallary 1925 [Pomatiasidae]
- Arabica, Jousseaume 1884 [Cypraeidae]
- Arabitrigonia [Trigoniida]
- Aracana, Gray 1833 [Tetraodontiformes]
- Arachnastraea, Yabe and Hayasaka 1916 [Yatsengiidae]
- Arachnida, class, Lamarck 1801 [Sclerophorata]
- Arachnidium [Ctenostomata]
- Arachniograptus, Ross and Berry 1963 [Graptoloidea]
- Arachniophyllum, Smyth 1915 [Aulophyllidae]
- Arachniopleurus [Glyphocyphidae]
- Arachnocrinus, Meek and Worthen 1866 [Cladida]
- Arachnocystites, Neumayr 1889 [Rhombifera]
- Arachnoidella [Ctenostomata]
- Arachnolasma, Grabau 1922 [Aulophyllidae]
- Arachnolasmella, Bykova 1966 [Aulophyllidae]
- Arachnophyllum, Dana 1846 [Arachnophyllidae]
- Arachnopusia, Jullien 1886 [Arachnopusiidae]
- Araeocrinus, Strimple and Watkins 1969 [Cladida]
- Araeodactylus, Harris and Burrows 1891 [Aporrhaidae]
- Araeopleura, Cox 1965 [Monopleuridae]
- Araeopoma, Lindström 1883 [Goniophyllidae]
- Araeopora, Etheridge and Nicholson 1879 [Cleistoporidae]
- Araeosoma [Echinothuriidae]
- Aragonella [Foraminifera]
- Aragonia [Foraminifera]
- Araiophyllum, Cuif 1975 [Microsolenidae]
- Araiopleura, Harrington and Leanza 1957 [Alsataspididae]
- Araiostrotion, Guo 1965 [Cleistoporidae]
- Arakaevella [Foraminifera]
- Araksalosia [Araksalosiidae]
- Aralocardia [Cardiida]
- Aramichthys, Signeux 1959 [Perciformes]
- Araneatrypa [Punctatrypidae]
- Araneites, Bogoslovsky 1971 [Sporadoceratidae]
- Araneograptus [Dendroidea]
- Arapahoia, Miller 1936 [Plethopeltidae]
- Araripichthys, R. Silva Santos 1985 [Araripichthyidae]
- Araspirifer [Cyrtinopsidae]
- Arathecus [Circothecida]
- Aratidecthes, Schram 1969 [Aeschronectida]
- Aratoechia [Trigonirhynchiidae]
- Aratrocypris [Podocopida]
- Arauzia, Mader 1986 [Ctenacanthiformes]
- Araxoceras, Ruzhencev 1959 [Araxoceratidae]
- Arbacia, Gray 1835 [Arbaciidae]
- Arbacina, Pomel 1869 [Temnopleuroida]
- Arbia, Cooke 1948 [Arbaciidae]
- Arbizustrophia [Strophodontidae]
- Arborocladia [Fenestrata]
- Arbuscula [Demospongea]
- Arca (Lissarca), E. A. Smith 1877 [Limopsidae]
- Arcacythere [Podocopida]
- Arcanoceras, Ruzhencev 1965 [Eogonioloboceratidae]
- Arcavicula, Cox 1964 [Pteriidae]
- Arcestes, Suess 1865 [Arcestidae]
- Arceythyris, Rollet 1964 [Postepithyrididae]
- Archaeagnostus, Kobayashi 1939 [Peronopsidae]
- Archaealveolina [Alveolinidae]
- Archaeaspis, Repina 1965 [Archaeaspididae]
- Archaecyclus [Foraminifera]
- Archaediscus [Archaediscidae]
- Archaeglobigerina [Foraminifera]
- Archaeoantennularia [Hydroida]
- Archaeocalyptocrinus, Whitzke and Strimple 1981 [Monobathrida]
- Archaeocarabus, McCoy 1849 [Palinuridae]
- Archaeocaris, Meek 1872 [Palaeostomatopoda]
- Archaeochintinia [Foraminifera]
- Archaeochitosa [Allogromiidae]
- Archaeoconularia [Scyphozoa]
- Archaeoconus [Hypseloconida]
- Archaeocrinus, Wachsmuth and Springer 1881 [Diplobathrida]
- Archaeocryptolaria [Hydroida]
- Archaeocyathida, order, Okulitch 1935 [Irregulares]
- Archaeocyathus [Archaeocyathida]
- Archaeocypoda, Secretan 1975 [Dorippidae]
- Archaeodictyomitra, E. A. Pessagno 1977 [Archaeodictyomitridae]
- Archaeodictyota [Graptolithina]
- Archaeodoryderma [Demospongea]
- Archaeofenestella [Fenestrata]
- Archaeogastropoda, order, J. Thiele 1925 [Gastropoda]
- Archaeogeryon, Colosi 1924 [Geryonidae]
- Archaeognathus [Conodontophorida]
- Archaeohagiastrum, Baumgartner 1984 [Hagiastridae]
- Archaeolafoea [Hydroida]
- Archaeolamna, M. Siverson 1992 [Archaeolamnidae]
- Archaeolasmogyra, Kolosvary 1957 [Scleractinia]
- Archaeolepas, Zittel 1884 [Scalpellidae]
- Archaeolynthus [Monocyathida]
- Archaeomeson [Stenolaemata]
- Archaeometra [Comatulida]
- Archaeonectris [Hydroida]
- Archaeonectrus, Novozhilov 1964 [Rhomaleosauridae]
- Archaeoniscus [Isopoda]
- Archaeopetasus [Problematica]
- Archaeopharetra [Archaeocyathida]
- Archaeophyllia, Beauvais 1972 [Reimaniphylliidae]
- Archaeophyllum [Cribricyathea]
- Archaeoplax, Stimpson 1863 [Retroplumidae]
- Archaeoprion [Eunicemorpha]
- Archaeopyramisa, Cheng 1986 [Latentifistulidae]
- Archaeorthis, Schuchert and Cooper 1931 [Archaeorthidae]
- Archaeoscyphia, Hinde 1889 [Anthaspidellidae]
- Archaeosepia [Sepiida]
- Archaeosepta [Foraminifera]
- Archaeosphaeroma [Isopoda]
- Archaeostraca, order, Claus 1888 [Malacostraca]
- Archaeosycon [Archaeocyathida]
- Archaeotritrabs, Steiger 1992 [Tritrabidae]
- Archaeotrypa [Anthozoa]
- Archaeozaphrentis, Ivanovskiy 1959 [Streptelasmatidae]
- Archaephippus, Blot 1969 [Ephippidae]
- Archaepyrgus [Isorophida]
- Archaesphaera [Archaesphaeridae]
- Archaetaxocrinus, Lewis 1981 [Taxocrinida]
- Archaias, Montfort 1808 [Soritidae]
- Archaiosteges [Aulostegidae]
- Archarenicola [Drilomorpha]
- Archeeucyrtis [Nassellaria]
- Archegocystis [Diploporita]
- Archegonaspis [Pteraspidomorphes]
- Archendoceras [Yanhecerida]
- Archeocosta [Podocopida]
- Archeocuneocythere [Podocopida]
- Archeocydippida [Ctenophora]
- Archeolimulus [Xiphosurida]
- Archeosolenocera, Carriol and Riou 1991 [Decapoda]
- Archiacia, Agassiz 1847 [Archiaciidae]
- Archiacina [Peneroplidae]
- Archiacoceras, Foerste 1926 [Archiacoceratidae]
- Archiclimacograptus [Graptoloidea]
- Archicorys [Nassellaria]
- Archicythereis, H. V. Howe 1936 [Podocopida]
- Archierato, Schilder 1932 [Triviidae]
- Archimedes [Fenestellidae]
- Archimediella, Sacco 1895 [Turritellidae]
- Archimediella (Torculoidella), Sacco 1895 [Turritellidae]
- Archiretiolites, Eisenack 1935 [Graptoloidea]
- Architectonica, Röding 1798 [Architectonicidae]
- Archithelphusa [Decapoda]
- Archivesica, Dall 1908 [Vesicomyidae]
- Archoceras, Schindewolf 1937 [Gephuroceratidae]
- Archocyrtium, Deflandre 1972 [Archocyrtiidae]
- Archodus [Pteraspidomorphes]
- Archypora, Chekhovich 1975 [Alveolitidae]
- Arcinella, Schumacher 1817 [Chamidae]
- Arcobelus [Belemnitida]
- Arcocyathus [Anthozoa]
- Arcoida, order, Stoliczka 1871 [Bivalvia]
- Arcomya, Agassiz 1838 [Pholadomyidae]
- Arcomytilus, Agassiz 1843 [Mytilidae]
- Arcopagella, Meek 1871 [Tellinidae]
- Arcopagia, Leach 1827 [Tellinidae]
- Arcopaginula, Lamy 1918 [Tellinidae]
- Arcopagiopsis [Cardiida]
- Arcoperna, Conard 1865 [Mytilidae]
- Arcoplasma [Anthozoa]
- Arcopsis, Koenen 1885 [Noetiidae]
- Arcoscalpellum, Hoek 1907 [Scalpellidae]
- Arctangia, Wells 1937 [Rhizangiidae]
- Arcthoplites [Cleoniceratidae]
- Arctica, Schumacher 1817 [Arcticidae]
- Arcticalymene, Adrain and Edgecombe 1997 [Calymenidae]
- Arcticeramus [Pterioida]
- Arcticoceras [Cardioceratidae]
- Arctinurus, Castelnau 1843 [Lichidae]
- Arctipeltis, Maksimova 1986 [Styginidae]
- Arctipoora [Fenestrata]
- Arctispira [Atrypinidae]
- Arctites, Ljaschenko 1969 [Volynitidae]
- Arctocephalites [Cardioceratidae]
- Arctocephalus, F. Cuvier 1826 [Carnivora]
- Arctoceras, Hyatt 1900 [Arctoceratidae]
- Arctogymnites, Y. N. Popov 1962 [Beyrichitidae]
- Arctohedra [Arctohedridae]
- Arctohungarites, C. Diener 1916 [Longobarditidae]
- Arctomeekoceras [Proptychitidae]
- Arctomelon [Neogastropoda]
- Arctomercaticeras [Hildoceratidae]
- Arctomeristina [Meristellidae]
- Arctomyalina [Pterioida]
- Arctonema, Orvig 1969 [Arthrodira]
- Arctophyllum, Fedorowski 1975 [Cyathopsidae]
- Arctopratulum [Cardiidae]
- Arctoprionites [Prionitidae]
- Arctoptychites, Y. V. Archipov et al. 1974 [Ptychitidae]
- Arctosirenites, E. T. Tozer 1961 [Trachyceratidae]
- Arctosomus, Berg 1941 [Pholidopleuriformes]
- Arctostrea, Pervinquiere 1910 [Ostreidae]
- Arctostroma, Yavorsky 1967 [Ferestromatoporidae]
- Arctotirolites, Y. Popov 1963 [Xenodiscidae]
- Arctotis, Bodylevsky 1960 [Oxytomidae]
- Arcturellina, Chavan 1951 [Carditidae]
- Arcuaria [Podocopida]
- Arcuatothyris [Cnismatocentridae]
- Arcuatula, Jousseaume 1919 [Mytilidae]
- Arcullaea, Vokes 1949 [Glycymerididae]
- Arcuolimbus, Palmer 1955 [Llanoaspididae]
- Arcyzona [Palaeocopida]
- Ardeamya [Cardiida]
- Ardennea [Palaeocopida]
- Ardiodus, White 1931 [Scombridae]
- Ardiviscus [Productidae]
- Ardmosteges [Cyclacanthariidae]
- Ardrossacyathus [Archaeocyathida]
- Arduennella, Wenndorf 1990 [Phacopida]
- Arduspirifer [Hysterolitidae]
- Arechia, Cappetta 1983 [Myliobatiformes]
- Areella, Erlang 1992 [Rhynchonellida]
- Areia, Barrande 1868 [Cheiruridae]
- Arellanella, Lochmann 1948 [Alokistocaridae]
- Arenaciarcula [Terebrataliidae]
- Arenagula [Foraminifera]
- Arene, H. Adams and A. Adams 1854 [Turbinidae]
- Arenicola [Drilomorpha]
- Areniconulus [Hippocrepinidae]
- Arenipiscis, Young 1981 [Arthrodira]
- Arenobulimina, Cushman 1927 [Globotextulariidae]
- Arenodosaria, Finlay 1939 [Valvulinidae]
- Arenogaudryina [Foraminifera]
- Arenonionella [Foraminifera]
- Arenoparrella [Foraminifera]
- Arenosiphon [Hippocrepinidae]
- Arenoturrispirillina [Ammodiscidae]
- Arenovidalina [Involutinidae]
- Areopsammia, Dietrich 1917 [Dendrophylliidae]
- Areostrophia [Areostrophiidae]
- Arestoceras [Brancoceratidae]
- Aretograptus [Dendroidea]
- Argalista, Iredale 1915 [Ataphridae]
- Argella [Hyattidinidae]
- Argenticytheretta [Podocopida]
- Argentiniceras [Cephalopoda]
- Argentiproductus [Productellidae]
- Argentopyge, Baldis 1972 [Phacopida]
- Argilloecia [Podocopida]
- Argobuccinum, Bruguière 1792 [Ranellidae]
- Argocheilus, Shimanskiy 1961 [Poterioceratidae]
- Argolites, Renz 1939 [Trachyceratidae]
- Argonauticeras, Anderson 1938 [Tetragonitidae]
- Argopecten, Monterosato 1889 [Pectinidae]
- Argopora [Cribrilinidae]
- Argorhynx [Retziellidae]
- Argosirenites, Y. N. Popov 1961 [Trachyceratidae]
- Argovithyris [Lobothyrididae]
- Argunaspis, Repina 1966 [Ptychopariida]
- Argutastrea, Crickmay 1960 [Disphyllidae]
- Argyripnus, Gilbert and Cramer 1897 [Stomiatiformes]
- Argyrobessa [Neogastropoda]
- Argyromya [Pholadomyida]
- Argyropelecus, Cocco 1829 [Sternoptychidae]
- Argyropeza, Melvill and Standen 1901 [Cerithiidae]
- Argyrosomus, La Pylaie 1835 [Perciformes]
- Argyrotheca, Dall 1900 [Megathyrididae]
- Ariadnaria, Habe 1961 [Trichotropidae]
- Arianites, G. v. Arthaber 1911 [Columbitidae]
- Arienigraptus [Graptoloidea]
- Arieticeras, Seguenza 1885 [Hildoceratidae]
- Arietites [Arietitidae]
- Arietoceltites, C. Diener 1916 [Tropitidae]
- Arikloedenia [Palaeocopida]
- Ariomma, Jordan and Snyder 1904 [Perciformes]
- Arionoceras, Barskov 1966 [Arionoceratidae]
- Ariosoma, Swainson 1838 [Congridae]
- Arisaigia, McLearn 1918 [Malletiidae]
- Arisostoma [Archaeogastropoda]
- Arisphinctes [Cephalopoda]
- Aristaluta [Ostracoda]
- Aristerella, Dunbar 1948 [Archaeogastropoda]
- Aristocaris [Arthropoda]
- Aristoceras, Ruzhencev 1950 [Thalassoceratidae]
- Aristoceratoides, Ruzhencev 1960 [Thalassoceratidae]
- Aristocystites, Barrande 1887 [Diploporita]
- Aristoharpes, Whittington 1950 [Harpetidae]
- Aristokainella, Zhiyi and Jinlin 1978 [Remopleurididae]
- Aristophyllum, Bulvanker et al. 1975 [Disphyllidae]
- Aristoptychites, C. Diener 1916 [Ptychitidae]
- Aristozoe [Archaeostraca]
- Aristozoe, Barrande 1868 [Isochilinidae]
- Arites [Phyllodocemorpha]
- Arius, Cuvier and Valenciennes 1840 [Ariidae]
- Arkacrinus, Knapp 1969 [Arkacrinidae]
- Arkanites, McCaleb et al. 1964 [Reticuloceratidae]
- Arkonoceras, Flower 1945 [Cephalopoda]
- Armagnostus, Howell 1937 [Agnostida]
- Armalites, Chudinova 1964 [Roemeriidae]
- Armatites, Becker 1993 [Tornoceratidae]
- Armatobalanus [Cirripedia]
- Armenina [Verbeekinidae]
- Armenoceras, Foerste 1924 [Armenoceratidae]
- Armenocrinus, Strimple and Horowitz 1971 [Cladida]
- Armillopora [Trepostomida]
- Armstrongia [Reticulosa]
- Arnaudaster [Echinolampadidae]
- Arnaudia, Fischer 1887 [Monopleuridae]
- Arnaudiella [Foraminifera]
- Arnheimograptus [Graptoloidea]
- Arnioceltites, E. v. Mojsisovics 1893 [Tropiceltitidae]
- Arnioceras [Arietitidae]
- Arniotites [Arietitidae]
- Arnoglossus, Bleeker 1862 [Pleuronectiformes]
- Arossia, Newman 1982 [Balanidae]
- Arpadites, E. v. Mojsisovics 1879 [Trachyceratidae]
- Arpagodus, Trautschold 1879 [Agassizodontidae]
- Arpaoceras, Zhuravleva 1962 [Pseudorthoceratidae]
- Arraphus, Angelin 1854 [Ptychopariida]
- Arrazocypris [Podocopida]
- Arrectoalatus, Nazarov and Ormiston 1985 [Corythoecidae]
- Arrectocrinus, Knapp 1969 [Catacrinidae]
- Arrhinella, Kozur and Mostler 1981 [Spumellaria]
- Arrhoges (Gabb 1868) [Aporrhaidae]
- Arrythmocricus [Archaeocyathida]
- Arsiriina [Palaeocopida]
- Artchedella [Cryptostomata]
- Artedius, Girard 1856 [Scorpaeniformes]
- Arterioceras [Orthocerida]
- Arthaberia [Astrophorida]
- Arthaberites, C. Diener 1900 [Noritidae]
- Arthessidae, family [Sacoglossa]
- Arthricocephalus, Bergeron 1899 [Oryctocephalidae]
- Arthritica, Finlay 1927 [Erycinidae]
- Arthroacantha, Wlliams 1883 [Monobathrida]
- Arthrochirotida, order [Holothuroidea]
- Arthrochites, Chen 1982 [Hexangulaconulariidae]
- Arthroclema, Billings 1862 [Arthrostylidae]
- Arthrodira, order, Woodward 1891 [Placodermi]
- Arthrophyllum, Beyrich 1850 [Lamellorthoceratidae]
- Arthropoda, phylum, Latreille 1829 [Panarthropoda]
- Arthropoma, Levinsen 1909 [Lacernidae]
- Arthrorhachis, Hawle and Corda 1847 [Metagnostidae]
- Arthrostyloecia [Cryptostomata]
- Arthrostylus, Ulrich 1888 [Arthrostylidae]
- Artichthyocrinus [Euryocrinidae]
- Articularia, Luczkovska 1972 [Hauerinidae]
- Articulina, d'Orbigny 1826 [Hauerinidae]
- Artifactella [Podocopida]
- Artigesia, Freneix and Sornay 1974 [Monopleuridae]
- Artimyctella [Problematica]
- Artinksia (J. J. Sepkoski 2002) [Medlicottiidae]
- Artioceras, Ruzhencev 1947 [Medlicottiidae]
- Artioceratoides, Leonova 1985 [Medlicottiidae]
- Artiotreta, Ireland 1961 [Scaphelasmatidae]
- Artiscus [Spumellaria]
- Artocapsa, Haeckel 1881 [Eucyrtidiidae]
- Artokephalus, Sivov and Egorova 1955 [Remopleurididae]
- Artoperina [Nassellaria]
- Artophormis, Haeckel 1881 [Eucyrtidiidae]
- Artospirifer [Spiriferida]
- Artostrobium [Nassellaria]
- Artostrobus, Haeckel 1887 [Acropyramididae]
- Arturocyathus [Ajacicyathida]
- Aruduce [Podocopida]
- Aryballocrinus, Breimer 1962 [Monobathrida]
- Arystidictyon [Reticulosa]
- Arzelella [Pterioida]
- Asa, Basterot 1825 [Veneridae]
- Asanoina [Foraminifera]
- Asanonella, Huang 1965 [Epistomariidae]
- Asanospira [Haplophragmoididae]
- Asaphechinus [Temnopleuroida]
- Asaphellina, Chalmas and Bergeron 1989 [Taihungshaniidae]
- Asaphellus, Callaway 1877 [Asaphidae]
- Asaphiceras, Foerste 1928 [Oncoceratidae]
- Asaphida, order, Salter 1864 [Trilobita]
- Asaphinella [Cardiida]
- Asaphinoides [Cardiida]
- Asaphis, Modeer 1793 [Psammobiidae]
- Asaphiscus, Meek 1873 [Asaphiscidae]
- Asaphoceras [Arietitidae]
- Asaphocrinus [Sagenocrinida]
- Asapholytoceras [Cephalopoda]
- Asaphoon, Hutchison and Ingham 1967 [Asaphidae]
- Asaphopsis, Mansuy 1920 [Taihungshaniidae]
- Asaphopsoides, Hupé 1953 [Hungaiidae]
- Asaphus, Brongniart 1822 [Asaphidae]
- Asarcophyllum [Anthozoa]
- Asbestoceras [Discosorida]
- Ascalobos [Pachycormiformes]
- Ascaulocardium, Pojeta and N. F. N. F 1987 [Clavagellidae]
- Ascensovoluta [Neogastropoda]
- Ascetocrinus, Kirk 1940 [Cladida]
- Aschemocella [Aschemocellidae]
- Asciocythere [Podocopida]
- Ascionepea, Opik 1967 [Ptychopariida]
- Ascitellina [Cardiida]
- Ascoceras, Barrande 1847 [Ascoceratidae]
- Ascocerida, order, Kuhn 1949 [Cephalopoda]
- Ascocystites, Barrande 1887 [Ascocystitida]
- Ascocystitida, order [Eocrinoidea]
- Ascodictyon [Ascodictyidae]
- Ascograptus [Graptolithina]
- Ascolatirus [Fasciolariidae]
- Ascoliella [Foraminifera]
- Ascopeltis [Proetida]
- Ascopora [Rhabdomesidae]
- Ascosyrinx [Problematica]
- Aseptalium [Innaechiidae]
- Aseptella [Productellidae]
- Aseptirhynchia [Aseptorhynchiidae]
- Aseptonetes [Chonetidae]
- Aserotaspis [Pteraspidomorphi]
- Asiagena, Maksimova 1975 [Brachymetopidae]
- Asiarhynchia, Su 1980 [Rhynchonellida]
- Asiatella, Repina 1964 [Ellipsocephalidae]
- Asiatotrigonia [Trigoniida]
- Asilluchus, Opik 1963 [Ptychopariida]
- Asima, Giebel 1848 [Labridae]
- Asineops, Cope 1870 [Actinopteri]
- Asiocephalus, Palmer 1968 [Ceratopygidae]
- Askeatonolucidum [Nautilida]
- Askepasma, Laurie 1986 [Cryptotretidae]
- Askeptosaurus, Nopcsa 1925 [Askeptosauridae]
- Asketaspis [Pteraspidomorphes]
- Asklepioceras, O. Renz 1911 [Trachyceratidae]
- Asoella, Tokuyama 1959 [Heteropectinidae]
- Aspasmophyllum, C. F. Roemer 1880 [Halliidae]
- Aspella, Mörch 1877 [Muricidae]
- Aspeluindia [Conodontophorida]
- Asperdaphne [Raphitomidae]
- Asperilla [Cirridae]
- Asperocare, Paulson 1958 [Corynexochida]
- Asperophyllum, Spasskiy 1964 [Cystiphyllidae]
- Asperopora [Trepostomida]
- Asphinctites [Morphoceratidae]
- Aspidaeglina, Holub 1911 [Cyclopygidae]
- Aspidagnostus, Whitehouse 1936 [Clavagnostidae]
- Aspidichthys, Newberry 1873 [Arthrothoraci]
- Aspidiscus, Koenig 1825 [Cyclolitidae]
- Aspidocarpus [Mitrata]
- Aspidoceras, Zittel [Aspidoceratidae]
- Aspidocrinus, Hall 1858 [Cyrtocrinida]
- Aspidogaster [Decapoda]
- Aspidograptus [Dendroidea]
- Aspidopholas, Fischer 1887 [Pholadidae]
- Aspidopora [Trepostomida]
- Aspidostephanus [Cephalopoda]
- Aspidosteus [Pteraspidomorphes]
- Aspidostoma, Hincks 1881 [Aspidostomatidae]
- Aspidothyris [Dielasmatidae]
- Aspinoceras [Cephalopoda]
- Aspinosella [Productidae]
- Assatkinella [Stenolaemata]
- Asselodiscus [Foraminifera]
- Asserculinia, Schouppé and Stacul 1959 [Metriophyllidae]
- Assilina [Nummulitidae]
- Astacolus, de Montfort 1808 [Vaginulinidae]
- Astacopsis, Huxley 1879 [Parastacidae]
- Astandes [Maturifusidae]
- Astarte, J. Sowerby 1816 [Astartidae]
- Astartellopsis, Beurlen 1954 [Astartidae]
- Astartemya, L. W. Stephenson 1941 [Astartidae]
- Astartopis [Cardiida]
- Astartopsis [Cardiida]
- Astele, Swainson 1855 [Trochidae]
- Astenaspis [Redlichiida]
- Asteracmea, Oliver 1926 [Acmaeidae]
- Asteractinella [Heteractinida]
- Asterigerina, d'Orbigny 1839 [Asterigerinidae]
- Asterigerinata [Foraminifera]
- Asterigerinella [Foraminifera]
- Asterigerinoides [Foraminifera]
- Asteroammonia [Foraminifera]
- Asteroarchaediscus [Archaediscidae]
- Asterobillingsia, Oliver 1974 [Eridophyllidae]
- Asteroblastus [Diploporita]
- Asterocalyx [Demospongea]
- Asteroceras [Asteroceratidae]
- Asterocidaris [Hemicidaridae]
- Asteroconus [Hydroconozoa]
- Asterocyathus [Ajacicyathida]
- Asterocyclina [Foraminifera]
- Asterocystis [Diploporita]
- Asterodisphyllum [Anthozoa]
- Asterohedbergella [Foraminifera]
- Asterohelix, Szabo 1984 [Archaeogastropoda]
- Asterolepidina [Foraminifera]
- Asterophragmina [Foraminifera]
- Asteropyge, Hawle and Corda 1847 [Acastidae]
- Asterorbis [Foraminifera]
- Asterorotalia [Foraminifera]
- Asterosalpinx [Serpulimorpha]
- Asterosmilia, Duncan 1867 [Caryophylliidae]
- Asterospongia [Demospongea]
- Asterosteus, Newberry 1875 [Asterosteidae]
- Asterostoma [Asterostomatidae]
- Asterotumulus [Ajacicyathida]
- Asthenoceras [Sonniniidae]
- Asthenocormus [Pachycormidae]
- Asthenophyllum, Grubbs 1939 [Streptelasmatidae]
- Asthenopsis, Whitehouse 1939 [Ptychopariidae]
- Asthenosoma [Echinothuriidae]
- Asthenotoma, Harris and Burrows 1891 [Turridae]
- Astiericeras [Cephalopoda]
- Astieridiscus [Cephalopoda]
- Astoceras [Actinocerida]
- Astraborthis [Anomalorthidae]
- Astractura [Spumellaria]
- Astraea, Röding 1798 [Turbinidae]
- Astraeoconus [Heteractinida]
- Astraeofungia, Alloiteau 1952 [Latomeandridae]
- Astraeomorpha, Reuss 1854 [Astraeomorphidae]
- Astraeophyllum, Nicholson and Hinde 1874 [Anthozoa]
- Astralium, Link 1807 [Turbinidae]
- Astralochoma [Trepostomida]
- Astrangia, Milne-Edwards and Haime 1848 [Rhizangiidae]
- Astraraea, Felix 1900 [Haplaraeidae]
- Astraspidiformes, order, Berg 1940 [Pteraspidomorphi]
- Astreopora, Blainville 1830 [Acroporidae]
- Astreptoscolex [Nephtyidae]
- Astrhelia, Milne-Edwards and Haime 1849 [Oculinidae]
- Astrictophyllum, Spasskiy 1971 [Stauriidae]
- Astrobolia, Zittel 1878 [Azoricidae]
- Astrocerium, Hall 1851 [Favositidae]
- Astrocladia, Zittel 1878 [Astrocladiidae]
- Astrococcus [Spumellaria]
- Astrocoenia, Milne-Edwards and Haime 1848 [Astrocoeniidae]
- Astroconia [Reticulosa]
- Astrocrinites, Conrad 1840 [Fissiculata]
- Astrocrinus, J. Morris 1843 [Fissiculata]
- Astrocyclia [Spumellaria]
- Astrocystites, Whiteaves 1897 [Edrioasterida]
- Astrodapsis [Echinarachniidae]
- Astroentactinia, Nazarov 1975 [Entactiniidae]
- Astrogyra, Felix 1900 [Placocoeniidae]
- Astroides, Quoy and Gaimard 1827 [Dendrophylliidae]
- Astrolemma [Demospongea]
- Astrolithium [Acantharia]
- Astromma [Spumellaria]
- Astronesthes, Richardson 1845 [Alepisauriformes]
- Astrononion, Cushman and Edwards 1927 [Nonionidae]
- Astropegma, Pomel 1872 [Ventriculitidae]
- Astropentagnathus [Conodontophorida]
- Astrophacus, Haeckel 1881 [Heliodiscidae]
- Astrophorida, order [Demospongea]
- Astroproetus, Begg 1939 [Proetidae]
- Astrorhiza [Astrorhizidae]
- Astrorotalia [Foraminifera]
- Astrosclerida [Axinellida]
- Astrosestrum [Spumellaria]
- Astrostylopsis, Germovsek 1954 [Actinostromariidae]
- Astrovidictya [Cryptostomata]
- Astroviella [Trepostomida]
- Astroviellina [Trepostomida]
- Astua [Trigonirhynchiidae]
- Asturiella [Podocopida]
- Asturiphyllum [Anthozoa]
- Asturistrophia [Strophodontidae]
- Asturoceras, Ruzhencev and Bogoslovskaya 1969 [Dimorphoceratidae]
- Astutorhyncha [Camarotoechiidae]
- Astya, Stechow 1921 [Stylasterina]
- Astycoryphe, Richter 1919 [Tropidocoryphidae]
- Astylomanon [Demospongea]
- Astylospongia, Roemer 1860 [Astylospongiidae]
- Astylospongiella, Rigby and Lenz 1978 [Astylospongiidae]
- Astyris, H. Adams and A. Adams 1853 [Columbellidae]
- Asymmetricythere [Podocopida]
- Asymmetrina [Foraminifera]
- Asymmetrochonetes [Strophochonetidae]
- Asymmetrocrinus, Wanner 1937 [Cladida]
- Asymphylotoechia [Polytoechiidae]
- Asymptoceras, Ryckholt 1852 [Aipoceratidae]
- Asyrinx [Syringothyrididae]
- Asyrinxia [Syringothyrididae]
- Atacama [Cheilostomata]
- Atacamichthyss [Pachycormiformes]
- Atactocrinus, Goldring 1923 [Diplobathrida]
- Atactolituola [Haplophragmoiidae]
- Atactopora [Trepostomida]
- Atactoporella, Ulrich 1883 [Monticuliporidae]
- Atactoporidra [Cheilostomata]
- Atactotoechus, Duncan 1939 [Atactotoechidae]
- Atactus [Echinidae]
- Ataktaspis, Lochman and Duncan 1944 [Corynexochida]
- Atalacmea, Iredale 1915 [Patellogastropoda]
- Atalantia [Trigoniida]
- Ataphropsis [Archaeogastropoda]
- Ataphrus, Gabb 1869 [Ataphridae]
- Atavograptus [Graptoloidea]
- Ataxioceras [Ataxioceratidae]
- Ataxiocyathus [Archaeocyathida]
- Ataxocerithium, Tate 1893 [Cerithiidae]
- Ataxoorbignyna [Foraminifera]
- Ataxophragmium [Ataxophragmiidae]
- Ataxotrochus, Wenz 1938 [Coelostylinidae]
- Atdabanella, Repina 1965 [Dorypygidae]
- Atdabanithes [Hyolithida]
- Atelaspidiformes, order [Cephalaspidomorphi]
- Atelaspis [Atelaspidiformes]
- Atelecyclus, Leach 1814 [Atelecyclidae]
- Atelelasma, Cooper 1956 [Clitambonitidae]
- Atelelasmoidea, Zeng 1987 [Gonambonitidae]
- Ateleocystites, Billings 1858 [Anomalocystitidae]
- Ateleopus, Agassiz 1846 [Lampridiformes]
- Atelesopora [Cyclostomata]
- Atelestocrinus, Wachsmuth and Springer 1886 [Cladida]
- Atelikamara [Hemisphaeramminidae]
- Atelodictyon, Lecompte 1951 [Atelodictyidae]
- Atelospatangus [Spatangidae]
- Atergatis, De Haan 1835 [Xanthidae]
- Athabascacrinus, Laudon and Parks 1952 [Monobathrida]
- Athabaschia [Petasmariidae]
- Athabaskiella, Kobayashi 1942 [Dolichometopidae]
- Athanatoceras [Discosorida]
- Athenaegis, Soehn and Wilson 1990 [Pteraspidomorphes]
- Atheresthes, Jordan and Gilbert 1881 [Pleuronectiformes]
- Atheriniformes, order, Rosen 1966 [Actinopteri]
- Atherinopsis, Girard 1854 [Atheriniformes]
- Athleta, Conrad 1853 [Volutidae]
- Athlocrinus, Moore and Plummer 1940 [Laudonocrinidae]
- Athrophragma [Cryptostomata]
- Athyrhynchus, Johnson 1973 [Septalariidae]
- Athyris [Athyrididae]
- Athyrisina [Athyrididae]
- Athyrisinoides, Chen and Wan 1979 [Athyrididae]
- Athyrisinopsis [Athyrididae]
- Atilia, H. Adams and A. Adams 1853 [Columbellidae]
- Atira, Stewart 1926 [Trochidae]
- Atjehella [Podocopida]
- Atlanta, Lesueur 1817 [Atlantidae]
- Atlanticythere, Benson 1977 [Trachyleberididae]
- Atlantida [Plectorthidae]
- Atlantidosteus, Lelievre 1984 [Arthrodira]
- Atlantobellerophon, Trechmann 1930 [Bellerophontida]
- Atlantoceras, Bensaid 1974 [Atlantoceratidae]
- Atlasaster [Pygasteroida]
- Atokacrinus, Knapp 1969 [Paradelocrinidae]
- Atoma [Neogastropoda]
- Atomoceras [Oncocerida]
- Atopacanthus, Hussakof and Bryant 1920 [Ischnacanthida]
- Atopechinus [Arbaciidae]
- Atopocephala, Brough 1934 [Brookvaliidae]
- Atopoceras, Kilian 1889 [Heteroceratidae]
- Atopocrinus, Lane 1970 [Crinoidea]
- Atopograptus [Graptoloidea]
- Atopostroma, Yang and Dong 1979 [Syringostromatidae]
- Atops, Emmons 1844 [Atopidae]
- Atractites [Aulacocerida]
- Atractocrinus, Kirk 1948 [Cladida]
- Atractopyge, Hawle and Corda 1847 [Encrinuridae]
- Atractosella, Hinde 1887 [Alcyonacea]
- Atractosoecia, Canu 1922 [Cyclostomata]
- Atractotrema, Cossmann 1888 [Fissurellidae]
- Atraktus, Gardner 1937 [Volutidae]
- Atrapocrinus, Strimple 1975 [Cladida]
- Atremacrinus, Wanner 1929 [Cladida]
- Atresius, Gabb 1869 [Gastropoda]
- Atreta, Etallon 1862 [Dimyidae]
- Atribonium [Stenoscismatidae]
- Atrina, Gray 1842 [Pinnidae]
- Atrochaetetes, Cuif and Fischer 1974 [Ceratoporellidae]
- Atropicaris [Microcarididae]
- Atrypa, Dalman 1828 [Atrypidae]
- Atryparia [Atrypidae]
- Atrypella [Lissatrypidae]
- Atrypellina [Lissatrypidae]
- Atrypida, order, Rzhonsnitskaya 1960 [Rhynchonellata]
- Atrypina, Hall and Clarke 1893 [Atrypinidae]
- Atrypinella [Punctatrypidae]
- Atrypinopsis [Atrypinidae]
- Atrypoidea, Mitchell and Dun 1920 [Lissatrypidae]
- Atrypopsis [Septatrypidae]
- Atrypunculus [Atrypidae]
- Atrythyris [Athyrididae]
- Atsabites, Haniel 1915 [Paragastrioceratidae]
- Attenuata, Hedley 1918 [Rissoidae]
- Atterdagia [Palaeocopida]
- Attiliosa, Emerson 1968 [Muricidae]
- Attinopora, Boardman et al. 1992 [Cinctiporidae]
- Attungaia, Pickett 1969 [Astylospongiidae]
- Aturia, Bronn 1838 [Aturiidae]
- Aturoidea, Vredenburg 1925 [Hercoglossidae]
- Atwillina [Foraminifera]
- Atyphocrinus, Ulrich 1924 [Heterocrinidae]
- Atys, Montfort 1810 [Haminoeidae]
- Aubertianella [Spirotrichia]
- Aubignyna, Margerel 1989 [Rotaliina]
- Aucellina, Pompeckj 1901 [Buchiidae]
- Auchenopora [Cheilostomata]
- Auchmerella [Araksalosiidae]
- Audaxlytoceras [Lytoceratidae]
- Audienusina [Foraminifera]
- Augea [Pterioida]
- Augurites [Auguritidae]
- Augustoceras, Flower 1946 [Valcouroceratidae]
- Auiophyseter (Kellogg 1927) [unclassified genus]
- Aulacatrypa [Lissatrypidae]
- Aulacella [Rhipidomellidae]
- Aulacera, Plummer 1843 [Aulaceratidae]
- Aulacoceras [Aulacocerida]
- Aulacocerida, order [Cephalopoda]
- Aulacodigma, Opik 1967 [Ptychopariida]
- Aulacofusus [Buccinidae]
- Aulacomya, Mörch 1853 [Mytilidae]
- Aulacomyella, Furlani 1910 [Posidoniidae]
- Aulaconautilus, Spath 1927 [Pseudonautilidae]
- Aulacophoria [Schizophoriidae]
- Aulacophyllum, Milne-Edwards and Haime 1850 [Halliidae]
- Aulacopleura, Hawle and Corda 1847 [Aulacopleuridae]
- Aulacopleurina, Pribyl 1949 [Eodrevermanniinae]
- Aulacopleurum [Trigoniida]
- Aulacopsis, Hessland 1949 [Palaeocopida]
- Aulacosia [Hexactinosa]
- Aulacosphinctes [Himalayitidae]
- Aulacosphinctoides [Perisphinctidae]
- Aulacospongia [Demospongea]
- Aulacostephanus [Perisphinctidae]
- Aulacoteuthis [Belemnitida]
- Aulacothyris, Douville 1880 [Zeilleriidae]
- Aulacothyropsis [Aulacothyropsidae]
- Aulakolepos [Turrilepadida]
- Aulasimoceras [Cephalopoda]
- Aulastraea, Ogilvie 1897 [Amphiastreidae]
- Aulastraeopora, Prever 1909 [Aulastraeoporidae]
- Aulatornoceras, Schindewolf 1922 [Tornoceratidae]
- Aulaxinia, Zittel 1878 [Siphoniidae]
- Aulechinus [Lepidocentridae]
- Aulica, Gray 1847 [Volutidae]
- Aulicina, Roverato 1929 [Volutidae]
- Aulie [Hesperomenidae]
- Auliela, Nazarov 1977 [Anakrusidae]
- Aulina, Smith 1917 [Lithostrotionidae]
- Auliscocyathus [Archaeocyathida]
- Auliskocrinus, Broadhead 1981 [Dichocrinidae]
- Aulites [Cryptoporidae]
- Aulocaulis, Fenton and Fenton 1937 [Auloporidae]
- Auloclisia, Lewis 1927 [Aulophyllidae]
- Auloconus, Piller 1978 [Involutinidae]
- Aulocopella, Rauff 1895 [Anthaspidellidae]
- Aulocopina [Demospongea]
- Aulocopium, Oswald 1847 [Streptosolenidae]
- Aulocricus [Ajacicyathida]
- Aulocrinus, Wachsmuth and Springer 1897 [Cladida]
- Aulocyclus [Calcarea]
- Aulocystella, Kuzina 1955 [Aulocystidae]
- Aulocystis, Schlüter 1885 [Aulocystidae]
- Aulocytheridea [Podocopida]
- Aulodesocrinus, Wright 1942 [Cladida]
- Aulodomus, Schrammen 1937 [Euretidae]
- Aulograptus [Graptoloidea]
- Aulokoninckophyllum, Sando 1976 [Lithostrotionidae]
- Aulonotreta, Kutorga 1848 [Aulonotretidae]
- Aulophax [Lychniscosa]
- Aulophyllum, Milne-Edwards and Haime 1850 [Aulophyllidae]
- Aulopiformes, order, Rosen 1973 [Actinopteri]
- Aulopora, Goldfuss 1829 [Auloporidae]
- Auloporella, Grubbs 1939 [Auloporidae]
- Auloprotonia [Productidae]
- Aulopus, Cloquet 1816 [Aulopidae]
- Aulorhamphus, Zigno 1890 [Aulorhamphidae]
- Aulorhynchus, Gill 1861 [Gasterosteiformes]
- Aulosmilia, Alloiteau 1952 [Meandrinidae]
- Aulosoma [Demospongea]
- Aulospongia [Calcarea]
- Aulostegites, Lejeune and Pel 1973 [Aulocystidae]
- Aulostomoides, Blot 1981 [Syngnathiformes]
- Aulostomus, Lacépède 1803 [Aulostomes]
- Aulostrotion [Anthozoa]
- Aulostylus, Sando 1976 [Lithostrotionidae]
- Aulotortus, Weynschenk 1956 [Involutinidae]
- Aulozoa, Grubbs 1939 [Auloporidae]
- Aupouria, Powell 1937 [Philobryidae]
- Aurelianella, Cossmann 1893 [Diastomatidae]
- Aureocrinus, Prokop 1982 [Crinoidea]
- Auriala, Akopjan 1976 [Aporrhaidae]
- Auriculatella, Tan 1980 [Archaeocopida]
- Aurigerites [Bufinidae]
- Aurila [Hemicytheridae]
- Aurina [Neogastropoda]
- Auristomia, Monterosato 1884 [Heterostrophia]
- Auritama, Opik 1976 [Auritamidae]
- Auroria [Foraminifera]
- Auroria [Stromatoporoidea]
- Auseria, Fucini 1895 [Archaeogastropoda]
- Ausia, G. Hahn and H. D. Pflug 1985 [Cnidaria]
- Aussites [Aulacocerida]
- Austinella, Foerste 1909 [Plaesiomyidae]
- Austinoceras, Foerste 1934 [Acleistoceratidae]
- Austinocrinus, Loriol 1889 [Isselicrinidae]
- Austinvillia, Resser 1938 [Ptychopariidae]
- Austracuculiaea [Arcida]
- Australanthus [Faujasiidae]
- Australicythere [Podocopida]
- Australina [Lissatrypidae]
- Australirhynchia [Machaerariidae]
- Australobollia [Palaeocopida]
- Australobuchia [Buchiidae]
- Australocoelia [Leptocoeliidae]
- Australoconularia [Scyphozoa]
- Australocystis [Mitrata]
- Australoecia [Podocopida]
- Australofenestella [Fenestrata]
- Australoharpes, Harrington and Leanza 1957 [Harpetidae]
- Australokaskia, B.A. Engel and N. Morris 1994 [Proetidae]
- Australolaxispira, Wang 1982 [Scalidae]
- Australolepis [Thelodontiformes]
- Australoneilo, Zinsmeister 1984 [Malletiidae]
- Australophyllum, Stumm 1949 [Ptenophyllidae]
- Australopolypora [Fenestrata]
- Australops, Baldis 1972 [Phacopida]
- Australopsis [Ostracoda]
- Australopyge, Harrington and Leanza 1957 [Asaphidae]
- Australosia [Araksalosiidae]
- Australosomus, Pivetau 1930 [Pholidopleuridae]
- Australospirifer [Hysterolitidae]
- Australostrophia [Strophochonetidae]
- Austriacopsis, Haber 1932 [Fissurellidae]
- Austriellula, Strand 1928 [Norellidae]
- Austriocaris [Conchyliocarida]
- Austrirhynchia [Austrirhynchidae]
- Austrisaturnalis, Kozur and Mostler 1972 [Multiarcusellidae]
- Austroaporrhais, Zinsmeister and Griffin 1995 [Aporrhaidae]
- Austrobalanus, Pilsbry 1916 [Cirripedia]
- Austroblastus, Mckellar 1969 [Fissiculata]
- Austrocardium, Freneix 1978 [Cardiidae]
- Austroceratites, Wegner 1957 [Ceratitidae]
- Austrochiton [Neoloricata]
- Austrochoristites [Spiriferidae]
- Austrocidaris, Clark 1907 [Cidaroida]
- Austroclavus, Powell 1942 [Turridae]
- Austroclupea, Bardack 1961 [Clupeiformes]
- Austrocochlis, Finlay 1937 [Naticidae]
- Austrocolomi [Foraminifera]
- Austrodosinia, Dall 1902 [Veneridae]
- Austrodrillia, Hedley 1918 [Turridae]
- Austrofusus, Kobelt 1879 [Buccinidae]
- Austroharpa, Finlay 1931 [Harpidae]
- Austrolepidotus [Semionotiformes]
- Austrolithes, Finlay 1931 [Neogastropoda]
- Austromacoma [Cardiida]
- Austromegabalanus [Cirripedia]
- Austromitra, Finlay 1927 [Costellariidae]
- Austromytilus, Laseron 1956 [Mytilida]
- Austronoplia [Chonetidae]
- Austrophycis, Ogilby 1897 [Gadiformes]
- Austropleuropholis [Pachycormiformes]
- Austrosassia, Finlay 1931 [Ranellidae]
- Austroscintilla [Cardiida]
- Austrosinia, Zhang and Jell 1987 [Ptychopariida]
- Austrosphaera, Camacho 1949 [Neogastropoda]
- Austrospirifer [Cyrtospiriferidae]
- Austroteuthis [Aulacocerida]
- Austrothyris [Terebratellidae]
- Austrotoma, Finlay 1924 [Raphitomidae]
- Austrotrigonia [Trigoniida]
- Austrotrillina [Austrotrillinidae]
- Austrotriton, Cossmann 1903 [Ranellidae]
- Austrotrophon, Dall 1902 [Muricidae]
- Austrovenus, Finlay 1926 [Veneridae]
- Autoloxolichas, Phleger 1936 [Lichidae]
- Avalanchurus, Edgecom and Chatte 1993 [Encrinuridae]
- Avalonia, Walcott 1889 [Trilobita]
- Avascutellum, Snajdr 1989 [Trilobita]
- Avellana, d'Orbigny 1842 [Ringiculidae]
- Averianowograptus [Graptoloidea]
- Aversovalva [Podocopida]
- Avesnella [Foraminifera]
- Aveyroniceras [Dactylioceratidae]
- Aviacypris [Podocopida]
- Avicenia, Leleshus 1974 [Proheliolitidae]
- Avichlamys [Pterioida]
- Avicularca [Pterioida]
- Avicularium [Cardiidae]
- Aviculocardium [Cardiida]
- Aviculocephaloconus [Mollusca]
- Aviculolima, Philippi 1900 [Limidae]
- Aviculomya [Bivalvia]
- Aviculomyalina, Assman 1916 [Myalinidae]
- Aviculoperna [Pterioida]
- Aviculovulsa [Pterioida]
- Avilionella, Flower 1952 [Barrandoceratidae]
- Avimactra, Andrussov 1905 [Mactridae]
- Avisyrinx [Strophopleuridae]
- Avitolabrax, Takai 1942 [Perciformes]
- Avitoluvarus, Bannikov and Tyler 1995 [Perciformes]
- Avoceras, J. J. Sepkoski 2002 [Bassleroceratidae]
- Avonia [Productellidae]
- Avonina, Lochman 1936 [Ptychopariida]
- Awateria, Suter 1917 [Turridae]
- Awhea [Nodosariidae]
- Axinellida, order, Bergquist 1967 [Demospongea]
- Axinola, Hertlein and Grant 1972 [Glycymerididae]
- Axinolobus, Gordon 1960 [Welleritidae]
- Axinopsida [Thyasiridae]
- Axinulus, Verrill and Bush 1898 [Thyasiridae]
- Axinura, Castelnau 1843 [Anthozoa]
- Axiodeaneia [Rhynchotetradidae]
- Axiopolina [Hauerinidae]
- Axiothea [Conodontophorida]
- Axiphoria, Cherepnina 1960 [Streptelasmatidae]
- Axius, Leach 1816 [Axiidae]
- Axoclisia, Semenoff-Tian-Chansky 1974 [Aulophyllidae]
- Axocricophyllum [Anthozoa]
- Axocyathus, Alloiteau 1952 [Caryophylliidae]
- Axolasma, Ivanovskiy 1963 [Streptelasmatidae]
- Axolithophyllum, Fomichev 1953 [Geyerophyllidae]
- Axonoceras, Stephenson 1941 [Nostoceratidae]
- Axophyllum, Milne-Edwards and Haime 1850 [Axophyllidae]
- Axopora [Milleporina]
- Axoporella [Milleporina]
- Axoprunum, Haeckel 1887 [Saturnalidae]
- Axosmilia, Milne-Edwards and Haime 1848 [Axosmiliidae]
- Axuolites, Sharkova 1963 [Alveolitidae]
- Axymene [Neogastropoda]
- Ayalaina [Meandropsinidae]
- Aysheaia [Onychophora]
- Azamella, Laurie 1991 [Trigonorhynchiidae]
- Azor [Solecurtidae]
- Azorica, Carter 1873 [Azoricidae]
- Azorinus, Récluz 1869 [Solecurtidae]
- Azumapecten [Pectinidae]
- Azygidium [Productellidae]
- Azygocrinus, Lane 1963 [Monobathrida]
- Azygograptus, Nicholson and Lapworth 1875 [Graptoloidea]
- Azyricyathus [Cribricyathea]
- Azyrtalia [Hexactinellida]
- Babakovia, Sivov 1955 [Corynexochida]
- Babelispirillina [Foraminifera]
- Babella, Dall & Bartsch 1906 [Heterostrophia]
- Babina [Strophochonetidae]
- Babinka, Barrande 1881 [Babinkidae]
- Babinocystis [Cornuta]
- Babukella [Aulacothyropsidae]
- Babylonella, Conrad 1865 [Cancellariidae]
- Babylonia, Schlüter 1838 [Buccinidae]
- Baccispongia [Hexactinellida]
- Bacinella [Problematica]
- Backhausina [Thecideidae]
- Bactrellaria [Candidae]
- Bactridium [Escharinidae]
- Bactrites, Sandberger 1843 [Bactritidae]
- Bactroceras, Holm 1898 [Baltoceratidae]
- Bactrocrinites, Schnur 1849 [Cladida]
- Bactrognathus [Conodontophorida]
- Bactronella, Hinde 1884 [Minchinellidae]
- Bactropora [Cryptostomata]
- Bactroptyxis, Cossmann 1896 [Heterostrophia]
- Bactrospira, Cossmann 1912 [Turritellidae]
- Bactrotheca, Novak 1891 [Orthothecidae]
- Bactrynium, Emmrich 1855 [Bactryniidae]
- Baculina, d'Orbigny 1850 [Bochianitidae]
- Baculites, Lamarck 1799 [Baculitidae]
- Baculocystites [Diploporita]
- Baculogypsina [Foraminifera]
- Baculogypsinoides [Foraminifera]
- Baculopora [Acanthocladiidae]
- Badainjaranaspis, Lu et al. 1986 [Ptychopariida]
- Badainjarania [Cyrtiidae]
- Badiotella, Bittner 1890 [Limidae]
- Badiotites, E. v. Mojsisovics 1879 [Badiotitidae]
- Badouceras [Orthocerida]
- Baelenia [Foraminifera]
- Baeopleuroceras, Williams 1935 [Nephriticeratidae]
- Baerocrinus, Volborth 1865 [Cladida]
- Baffincythere [Podocopida]
- Bagenoviella [Mollusca]
- Baggatella [Foraminifera]
- Baggina, Cushman 1926 [Bagginidae]
- Bagginoides [Foraminifera]
- Bagnorthis [Dalmanellidae]
- Bagongshania, Lin 1983 [Crepicephalidae]
- Bagrasia [Sentosiidae]
- Baikalocyathus [Ajacicyathida]
- Baikitolites, Sokolov 1955 [Lyoporidae]
- Baikonuraspis, Ergaliev 1983 [Ptychopariida]
- Bailiaspis, Resser 1936 [Conocoryphidae]
- Bailiella, Mathews 1885 [Conocoryphidae]
- Bailielloides, Kobayashi and Hamada 1972 [Proetida]
- Bailongjiangella [Trigonirhynchiidae]
- Bailya, Smith 1944 [Buccinidae]
- Bainbridgia, Ball 1933 [Pyrgiidae]
- Bainella, Rennie 1930 [Calmoniidae]
- Bairdianella [Bohlenatiidae]
- Bairdiella, Gill 1861 [Perciformes]
- Bairdiocypris [Podocopida]
- Bairdiohealdites [Podocopida]
- Bairdiolites, Croneis and Gale 1939 [Bairdiidae]
- Bairdites [Metacopida]
- Bairdoppilata [Podocopida]
- Bairdops, Schram 1979 [Palaeostomatopoda]
- Baisalina [Baisalinidae]
- Baitalites, Chekhovich 1977 [Proporidae]
- Baituganella [Foraminifera]
- Baituganocaris [Archaeostraca]
- Bajacythere [Podocopida]
- Bajaichthys, Sorbini 1983 [Bajaichthyidae]
- Bajanhongorella [Strophomenidae]
- Bajanorthis [Orthida]
- Bajgolia, Dzyubo 1962 [Bajgoliidae]
- Bajiella, Jiang 1982 [Archaeocopida]
- Bajkaloceras, Balashov 1960 [Bajkaloceratidae]
- Bajolla [Stenolaemata]
- Bakevellia, King 1848 [Bakevelliidae]
- Bakevelloides, Tokuyama 1959 [Bakevelliidae]
- Bakewellia (King 1848) [Bivalvia]
- Bakunella [Podocopida]
- Balabania [Hippuritida]
- Balacrinus, Ramsbottom 1961 [Diplobathrida]
- Balakhonia [Linoproductidae]
- Balangia, Chien 1961 [Corynexochida]
- Balanocidaris [Cidaridae]
- Balanoconcha [Gillediidae]
- Balanocrinus, Agassiz 1847 [Isocrinidae]
- Balanocystites [Mitrata]
- Balanophyllia, Wood 1844 [Dendrophylliidae]
- Balantionella, Schrammen 1902 [Euretidae]
- Balantiostoma [Romancheinidae]
- Balantoides [Palaeocopida]
- Balanus, Da Costa 1778 [Balanidae]
- Balashovia [Oncocerida]
- Balatonia [Disjectoporidae]
- Balatonites, E. v. Mojsisovics 1879 [Balatonitidae]
- Balcis, Leach 1847 [Melanellidae]
- Balcoracania, Pocock 1970 [Emuellidae]
- Balderia, Robison 1988 [Menomoniidae]
- Balearites, Sarkar 1954 [Crioceratitidae]
- Balearocrinus, Bourrouilh and Termier 1974 [Crinoidea]
- Baleiichthys [Pachycormiformes]
- Balistomorphus, Gill 1888 [Tetraodontiformes]
- Balizoma, Holloway 1980 [Encrinuridae]
- Balkanites, Ganev 1966 [Dinaritinae]
- Balkhania [Foraminifera]
- Balkhasheconcha [Echinoconchidae]
- Balkoceras [Balkoceratidae]
- Ballardina [Palaeocopida]
- Balowella [Podocopida]
- Baltagnostus, Lochmann 1944 [Diplagnostidae]
- Balticella [Palaeocopida]
- Balticeras [Cephalopoda]
- Balticoceras, Teichert 1940 [Cephalopoda]
- Balticopora [Trepostomida]
- Balticoporella, Vinassa de Regni 1921 [Trepostomida]
- Balticoporellina [Cystoporata]
- Baltoniodus [Balognathidae]
- Baltonotella [Palaeocopida]
- Baltoparadoxides [Redlichiida]
- Baluchicardia, Rutsch and Schenck 1943 [Carditidae]
- Balvia, Lange 1929 [Prionoceratidae]
- Bambusoceras [Ellesmerocerida]
- Bamyaniceras, Termier and Termier 1970 [Medlicottiidae]
- Bananogmius, Whitley 1940 [Plethodidae]
- Banastella [Fenestrata]
- Bancroftina, Sinclair 1946 [Dalmanellidae]
- Bandalaspis, Ivshin 1962 [Eurekiidae]
- Bandelium [Pleurotomariida]
- Bandellina, Schroder 1995 [Cornirostridae]
- Bandyella [Foraminifera]
- Banffella [Foraminifera]
- Banffia [Problematica]
- Banis, L. W. Stephenson 1941 [Naticidae]
- Bankia, Gray 1842 [Teredinidae]
- Bankivia, Krauss 1848 [Trochidae]
- Bannerella [Foraminifera]
- Bapingaspis, Yuan 1988 [Proetida]
- Baptopora [Cheilostomata]
- Baptornis, O. C. Marsh 1877 [Aves]
- Barbaestrophia [Leptostrophiidae]
- Barbarella, Flügel 1972 [Plerophyllidae]
- Barbarofusus, Grabau and Shimer 1909 [Neogastropoda]
- Barbarothyris [Meganterididae]
- Barbatia, Gray 1842 [Arcidae]
- Barbatia (Ovalarca), Woodring 1925 [Arcidae]
- Barbatulella [Obolidae]
- Barbierella, Chavan 1938 [Lucinidae]
- Barbieria [Diploporita]
- Barbosaia [Pterioida]
- Barbotella, Cossmann 1918 [Archaeogastropoda]
- Barbourinella [Foraminifera]
- Barcarenichthys, Gayet 1989 [Salmoniformes]
- Barcoona [Bivalvia]
- Barehamia [Pterioida]
- Barella, Herdström 1930 [Hyolithellidae]
- Barentsia [Entoprocta]
- Barkeria [Neogastropoda]
- Barkerina [Foraminifera]
- Barklyella, Shergold 1969 [Trilobita]
- Barkolia [Septatrypidae]
- Barleeia, Clark 1853 [Barleeidae]
- Barnardina [Foraminifera]
- Barnea, Leach 1826 [Pholadidae]
- Baronnites [Cephalopoda]
- Barrandeites, E. v. Mojsisovics 1893 [Haloritidae]
- Barrandeocarpus [Mitrata]
- Barrandeoceras, Hyatt 1884 [Barrandoceratidae]
- Barrandeocrinus, Angelin 1878 [Monobathrida]
- Barrandeograptus [Graptoloidea]
- Barrandeolites, Sokolov and Prantl 1965 [Tiverinidae]
- Barrandeophyllum, Pocta 1902 [Laccophyllidae]
- Barrandia, McCoy 1849 [Nileidae]
- Barrandina [Clorindidae]
- Barremites [Desmoceratidae]
- Barrettia, Woodward 1862 [Hippuritidae]
- Barroisella, Cooper 1942 [Lingulidae]
- Barroisia, Munier-Chalmas 1882 [Sphaerocoeliidae]
- Barroisiceras, de Grossouvre 1894 [Collignoniceratidae]
- Barroisucaulus [Murchisoniidae]
- Barrosina [Palaeocopida]
- Barrychilina [Podocopida]
- Bartonia [Neogastropoda]
- Bartramella, Verville et al. 1956 [Fusulinidae]
- Bartrumia, Marwick 1934 [Tellinidae]
- Bartschella, Iredale 1916 [Pyramidellidae]
- Barunkhuraya [Productellidae]
- Barychilina [Metacopida]
- Baryconites, Palmer 1928 [Hippuritida]
- Barycrinus, Meeke and Worthen 1868 [Botryocrinidae]
- Barycypraea, Schilder 1927 [Cypraeidae]
- Baryhelia, Milne-Edwards and Haime 1857 [Heterocoeniidae]
- Barylasma, Weyer 1973 [Plerophyllidae]
- Barymactra, Cossmann 1909 [Mactridae]
- Barymepton [Palaeocopida]
- Baryphyllia, Fromentel 1857 [Calamophylliidae]
- Baryphyllum, Milne-Edwards and Haime 1850 [Plerophyllidae]
- Barysmilia, Milne-Edwards and Haime 1848 [Rhipidogyridae]
- Baryspira, Fischer 1883 [Olividae]
- Barytellina, Marwick 1924 [Tellinidae]
- Barytichisma, Moore and Jeffords 1945 [Hapsiphyllidae]
- Barzellinia, Gregorio 1930 [Rhynchonellida]
- Baschkirina [Bairdiocyprididae]
- Baschkirites, Librovitch 1957 [Girtyoceratidae]
- Bascomella, Morningstar 1922 [Ascodictyidae]
- Bashkiria [Strophopleuridae]
- Bashkiriella [Fenestrata]
- Bashkortoceras, Ruzhencev and Bogoslovskaya 1971 [Homoceratidae]
- Basidechenella, Richter 1912 [Proetidae]
- Basilicorhynchus [Leiorhynchidae]
- Basilicus, Salter 1849 [Asaphidae]
- Basiliola, Dall 1908 [Basiliolidae]
- Basilirata, Youlou 1978 [Stenothyridae]
- Basilissa, Watson 1879 [Seguenziidae]
- Basilitrona, Iredale 1930 [Cypraeidae]
- Basleocrinus, Wanner 1916 [Cladida]
- Basleophyllum, Schouppé and Stacul 1959 [Zaphrentoididae]
- Basocephalus, Ivshin 1952 [Dorypygidae]
- Basommatophora, order, Keferstein 1864 [Gastropoda]
- Basommatophora, superfamily (Keferstein 1864) [Gastropoda]
- Basseaster [Holasteridae]
- Bassettina, Hodges 1995 [Cirripedia]
- Bassina, Jukes-Brown 1914 [Veneridae]
- Bassinaria, Marwick 1928 [Veneridae]
- Bassipterus [Eurypterida]
- Basslederella [Stenolaemata]
- Bassleratia [Palaeocopida]
- Basslerites [Podocopida]
- Bassleroceras, Ulrich and Foerste 1936 [Bassleroceratidae]
- Basslerocystis, Caster 1952 [Mitrata]
- Bassozetus, Gill 1883 [Ophidiiformes]
- Basterotia, Mayer in Hörnes 1859 [Sportellidae]
- Bastindoceras [Nautilida]
- Bastropia [Neogastropoda]
- Batalleria [Diploporita]
- Batavocythere [Podocopida]
- Batchatiella, Poletaeva 1970 [Ptychopariida]
- Bateroboceras [Tarphycerida]
- Baterospirifer [Cyrtiidae]
- Bathericrinus, Jaekel 1918 [Cladida]
- Batherocystis, Bassler 1950 [Eocrinoidea]
- Bathmoceras, Barrande 1865 [Bathmoceratidae]
- Bathosella [Romancheinidae]
- Bathotheca [Demospongea]
- Bathraspira, Cossmann 1906 [Mathildidae]
- Bathrocalpis [Nassellaria]
- Bathronocrinus, Strimple 1962 [Laudonocrinidae]
- Bathropyramis, Haeckel 1881 [Acropyramididae]
- Bathrotomaria, Cox 1956 [Pleurotomariidae]
- Bathyarca, Kobelt 1891 [Arcidae]
- Bathybalva [Anthozoa]
- Bathybembix, Crosse 1892 [Calliotropidae]
- Bathycheilus, Holub 1908 [Bathycheilidae]
- Bathyclupea, Alcock 1891 [Bathyclupeidae]
- Bathycoenia, Tomes 1883 [Meandrinidae]
- Bathycrinus, Thomson 1872 [Isocrinida]
- Bathycyathus, Milne-Edwards and Haime [Turbinoliidae]
- Bathycythere [Podocopida]
- Bathydiscus, Rasetti 1966 [Weymouthiidae]
- Bathygadus, Guenther 1878 [Gadiformes]
- Bathygalea, Woodring and Olsson 1957 [Cassidae]
- Bathylagus, Günther 1878 [Bathylagidae]
- Bathylasma, Newman and Ross 1971 [Pachylasmatidae]
- Bathymyonia [Echinoconchidae]
- Bathynotellus, Lermontova 1940 [Trilobita]
- Bathynotus, Hall 1860 [Chengkouaspidae]
- Bathyocos, Sunbe 1994 [Ptychopariidae]
- Bathyrhyncha, Fuchs 1923 [Trigonirhynchiidae]
- Bathysiphon, G. O. Sars 1872 [Bathysiphonidae]
- Bathysoma, Davis 1890 [Lampridiformes]
- Bathysquilla [Stomatopoda]
- Bathystomella [Cheilostomata]
- Bathytoma, Harris and Burrows 1891 [Turridae]
- Bathytormus, Stewart 1930 [Crassatellidae]
- Bathyurellus, Billings 1865 [Bathyuridae]
- Bathyuriscellus, Lermontova 1951 [Jakutidae]
- Bathyuriscidella, Rasetti 1948 [Dolichometopidae]
- Bathyuriscops, Keller and Lisogor 1954 [Leiostegiidae]
- Bathyuriscopsis, Suvorova 1960 [Corynexochida]
- Bathyuriscus, Meek [Dolichometopidae]
- Bathyurus, Billings 1859 [Bathyuridae]
- Bathyurus (Raymondites), Sinclair 1944 [Bathyuridae]
- Batillaria, Benson 1842 [Batillariidae]
- Batillaria (Tateiwaia), Makiyama 1936 [Potamididae]
- Batillona, Finlay 1927 [Turritellidae]
- Batissa, Gray 1853 [Corbiculidae]
- Batocara, Strusz 1980 [Encrinuridae]
- Batocrinus, Casseday 1854 [Monobathrida]
- Batolites [Hippuritida]
- Batopora [Batoporidae]
- Batostoma, Ulrich 1882 [Trepostomida]
- Batostomella [Trepostomida]
- Batostomellina [Trepostomida]
- Batrachoides, Lapepède 1800 [Batrachoidiformes]
- Batrachoidiformes, order [Actinopteri]
- Batrachopora [Cheilostomata]
- Batschykicyathus [Ajacicyathida]
- Battaglia, Senowbari-Daryan and Schäfer 1986 [Solenolmiidae]
- Baturria [Proschizophoriidae]
- Batyraspis, Apollonov and Tschugaeva 1983 [Phacopida]
- Bauchioceras (Wrightoceras), Reyment 1954 [Pseudotissotidae]
- Baueria [Arbaciidae]
- Bauneia, Peterhans 1927 [Chaetetidae]
- Bauxia, Caziot 1890 [Pomatiasidae]
- Bavarilla, Barrande 1868 [Bavarillidae]
- Bayania, Munier-Chalmas 1877 [Thiaridae]
- Bayanoteuthis [Belemnitida]
- Bayfieldia, Clark 1924 [Eurekiidae]
- Baykonuroceras, I. S. Barskov 1972 [Proteoceratidae]
- Bayleia, Munier-Chalmas 1873 [Requieniidae]
- Bayleites [Cephalopoda]
- Bayleoidea [Requieniidae]
- Bazardarella [Zeilleriidae]
- Bdelloidina [Lituolidae]
- Beachia [Centronellidae]
- Beania, Johnston 1840 [Bicellariellidae]
- Beaniceras [Liparoceratidae]
- Beatamoosina [Podocopida]
- Beatites [Aspenitidae]
- Beaumontia, Milne-Edwards and Haime 1851 [Micheliniidae]
- Beaumontoperca, Gaudant 2000 [Perciformes]
- Beaussetia [Lychniscosa]
- Becharocrinus, Termier and Termier 1956 [Crinoidea]
- Bechleja, Housa 1957 [Palaemonidae]
- Beckerhealdia [Metacopida]
- Beckmannia [Hebetoechiidae]
- Becksia, Schlüter 1868 [Callodictyonidae]
- Beckwithia, Resser 1931 [Beckwithiidae]
- Bedeva, Iredale 1924 [Muricidae]
- Beecherella [Podocopida]
- Beecheria [Beecheriidae]
- Beecheroscapha [Beecherellidae]
- Beedeina [Fusulinidae]
- Beekmanoceras, Ulrich and Foerste 1936 [Gastropoda]
- Beella [Foraminifera]
- Beichuanella [Stenoscismatidae]
- Beichuania [Bivalvia]
- Beichuanrhynchus [Rhynchonellida]
- Beigongia, Qiu 1983 [Pterocephaliidae]
- Beikedamaspis [Trilobita]
- Beiliupora, Yü and Deng 1974 [Favositidae]
- Beishanella [Redlichiida]
- Beisselia [Neogastropoda]
- Beisselina [Tessaradomidae]
- Beisselinopsis [Cheilostomata]
- Beitaia [Atrypinidae]
- Bejrutella [Tchegemithyrididae]
- Bekena [Metacopida]
- Bekkeromena, Roomusoks 1963 [Rafinesquinidae]
- Beklemishevites [Hyolithelminthes]
- Bekoma, Riedel and Sanfilippo 1971 [Bekomidae]
- Bela, Gray 1847 [Turridae]
- Belanskicrinus, Strimple and Levorson 1969 [Cladida]
- Belatomina [Neogastropoda]
- Belbekella, Moisseev 1939 [Tetrarhynchiidae]
- Belemnacanthus, Eastman 1898 [Arthrodira]
- Belemnella [Belemnitida]
- Belemnellocamax [Belemnitida]
- Belemnitella, Pavlow 1914 [Belemnitellidae]
- Belemnites [Belemnitida]
- Belemnitida, order, Zittel 1895 [Cephalopoda]
- Belemnitina [Belemnitida]
- Belemnobatis, Thiollière 1854 [Rhinobatidae]
- Belemnocamax [Belemnitida]
- Belemnocrinus, Munier-chalmas 1876 [Crinoidea]
- Belemnocystites [Soluta]
- Belemnopsis, Bayle 1878 [Belemnitida]
- Belemnosella, Naef 1922 [Sepiida]
- Belemnosis, Edwards 1849 [Sepiida]
- Belemnospongia, Ulrich 1889 [Demospongea]
- Belemnostroma, Stearn 1990 [Tienodictyidae]
- Beleutella [Monticuliferidae]
- Belgradeophyllum, Cotton 1973 [Anthozoa]
- Bellaspidella, Rasetti 1945 [Dokimocephalidae]
- Bellaspira, Conrad 1868 [Turridae]
- Bellaspis, Rasetti 1945 [Dokimocephalidae]
- Bellastraea, Iredale 1924 [Turbinidae]
- Bellatara, Strand 1928 [Cerithiidae]
- Bellaxinaea, Nicol 1984 [Glycymerididae]
- Bellefontia, Walcott 1924 [Asaphidae]
- Bellerophina, d'Orbigny 1843 [Bellerophinidae]
- Bellerophontida, order, Ulrich and Scofield 1897 [Gastropoda]
- Belliceps, Repina 1966 [Redlichiida]
- Bellifusus, L. W. Stephenson 1941 [Fasciolariidae]
- Bellinuroopsis [Xiphosurida]
- Bellinurus, Pictet 1846 [Bellinuridae]
- Belliscala, L. W. Stephenson 1941 [Epitoniidae]
- Bellocaris [Mysidacea]
- Belloceras [Ellesmerocerida]
- Belloliva, Peile 1922 [Olividae]
- Bellornatia [Palaeocopida]
- Bellucina, Dall 1901 [Lucinidae]
- Beloceras, Hyatt 1884 [Beloceratidae]
- Belochthus [Isorophida]
- Belocrinus, E. C. P. A Munier-Chalmas 1881 [Spiraculata]
- Belocurta, Avnimelech 1956 [Sepiida]
- Belodella, Ethington 1959 [Cornuodontidae]
- Belodina, Ethington 1959 [Panderodontidae]
- Beloitoceras, A. F. Foerste 1924 [Oncoceratidae]
- Belone, Oken 1816 [Scomberesocidae]
- Belonechitina [Rhizopodea]
- Belonidium, Cossmann 1892 [Pyramidellidae]
- Beloniformes, order [Actinopteri]
- Belonisia [Hexactinosa]
- Belophos, Cossmann 1901 [Neogastropoda]
- Beloplaxus [Neoloricata]
- Beloptera, de Blainville 1827 [Sepiida]
- Belopteridium, Naef 1921 [Sepiida]
- Belopterina, Munier-Chalmas 1872 [Sepiida]
- Belorussiella [Verneuilinidae]
- Belorussipora [Cystoporata]
- Belosepia, Bronn 1838 [Sepiidae]
- Belosepiella, Alessandri 1905 [Sepiida]
- Belospirula [Belemnitida]
- Belosteus, Jaeckel 1927 [Arthrodira]
- Belotelson [Belotelsonidea]
- Belotelsonidea, order, Schram 1981 [Malacostraca]
- Belothyris [Kingenidae]
- Belovia, Poletaeva 1956 [Lichakephalidae]
- Belowea [Spumellaria]
- Beltanacyathus [Archaeocyathida]
- Beltanelliformis [Actiniaria]
- Beltella, Lake 1919 [Olenidae]
- Bemaspis, Frederickson 1949 [Ptychopariida]
- Bembicium, Philippi 1846 [Littorinidae]
- Bembridgia, Fischer 1885 [Pomatiasidae]
- Bembrops, Steindachner 1877 [Perciformes]
- Benacoceras [Cephalopoda]
- Bendeia [Neogastropoda]
- Bendemacoma [Cardiida]
- Bendenius [Palaeonisciformes]
- Beneckastraea, Cuif 1976 [Pamiroseriidae]
- Beneckeia, E. v. Mojsisovics 1882 [Beneckeiidae]
- Benesovella, Chlupac 1969 [Proetidae]
- Bennviaspis [Ostracoda]
- Bensonastraea, Pedder 1966 [Phillipsastreidae]
- Bensonia, Gray 1847 [Naticidae]
- Bensonocythere, Hazel 1967 [Trachyleberididae]
- Benthamaspis, Poulsen 1946 [Bathyuridae]
- Bentharca, Verrill and Bush 1898 [Arcidae]
- Benthesicymus, Bate 1881 [Benthesicymidae]
- Benthocardiella, Powell 1930 [Condylocardiidae]
- Benthocometes, Goode and Bean 1896 [Ophidiiformes]
- Benthocrinus, Verrill 1885 [Cladida]
- Benthomangelia, Thiele 1925 [Turridae]
- Benthosema, Goode and Bean 1896 [Myctophidae]
- Benxioceras [Protactinocerida]
- Benxiphyllum [Petalaxidae]
- Beogradophyllum, Cotton 1973 [Anthozoa]
- Beothuckia, Ludvigsen and Westrop 1989 [Ptychopariida]
- Berabichia, Geyer 1990 [Ellipsocephalidae]
- Berbericeras [Cephalopoda]
- Berdanopis [Palaeocopida]
- Berenicea, Lamouroux 1821 [Cyclostomata]
- Beretra, L. W. Stephenson 1941 [Turridae]
- Bergalaria [Septalariidae]
- Bergamia, Whittard 1955 [Trinucleidae]
- Bergerolimbus, Hupé 1960 [Trilobita]
- Bergeroniaspis, Lermontova 1951 [Ellipsocephalidae]
- Bergeroniellus, Lermontova 1940 [Ellipsocephalidae]
- Bergeronites, Sun 1937 [Damesellidae]
- Berggrenia [Foraminifera]
- Bergoceras, Flower 1939 [Pseudorthoceratidae]
- Bergstroemognathus [Conodontophorida]
- Bergstroemograptus [Graptoloidea]
- Beringius, Dall 1886 [Neptuneidae]
- Berkhia, Gorskiy 1951 [Aulophyllidae]
- Berkutaspis, Lisogor 1947 [Nileidae]
- Berlieria, de Loriol 1903 [Patellidae]
- Bermudezella [Foraminifera]
- Bermudezina [Foraminifera]
- Bermudezinella [Foraminifera]
- Bernaya, Jousseaume 1884 [Cypraeidae]
- Bernia, Frederickson 1949 [Parabolinoididae]
- Bernoullius, Baumgartner 1984 [Gomberellidae]
- Beroides [Mollusca]
- Berolinella [Palaeocopida]
- Berounella [Podocopida]
- Berriasella, Uhlig 1905 [Neocomitidae]
- Berrosiceras [Cephalopoda]
- Berryteuthis, Naef 1923 [Teuthida]
- Berthelina [Foraminifera]
- Berthelinella [Foraminifera]
- Berthelinia [Sacoglossa]
- Berthelinopsis [Foraminifera]
- Bertillonella [Myodocopida]
- Berybolcensis, Sorbini 1984 [Holocentridae]
- Beryciformes, order, Regan 1909 [Actinopteri]
- Berycomorus, Arambourg 1967 [Beryciformes]
- Berycopsia, Radovcic 1975 [Polymixiiformes]
- Beryllia [Cornuta]
- Beryx, Cuvier 1829 [Beryciformes]
- Beschevella [Martiniidae]
- Besla, Dall and Bartsch 1904 [Pyramidellidae]
- Bestjubella, Ivshin 1955 [Lichakephalidae]
- Bethanyphyllum, Stumm 1949 [Bethanyphyllidae]
- Betterbergia [Hebetoechiidae]
- Bettonia, Whittard 1956 [Trinucleidae]
- Betyokites [Cephalopoda]
- Beudanticeras, Hitzell 1902 [Desmoceratidae]
- Beudantiella [Cephalopoda]
- Beugniesastraea, Coen-Aubert 1988 [Spongophyllidae]
- Bevahites [Collignoniceratidae]
- Beyrichia, M'Coy 1846 [Beyrichiidae]
- Beyrichiella [Palaeocopida]
- Beyrichiopsis [Palaeocopida]
- Beyrichites, Waagen 1895 [Beyrichitidae]
- Beyrichoceras, Foord 1903 [Maxigoniatitidae]
- Beyrichoceratoides, Bisat 1924 [Muensteroceratidae]
- Beyrichocrinus, Waagen and Jahn 1899 [Monobathrida]
- Beyrichona, Mathew 1886 [Beyrichonidae]
- Bezanconia, Bayle in Fischer 1884 [Cerithiidae]
- Biapertorbis [Foraminifera]
- Biarea, Torbakova 1959 [Articulata]
- Biarritzina [Foraminifera]
- Biasterigerina [Foraminifera]
- Biaurina [Ostracoda]
- Biavertia, Opik 1967 [Ptychopariida]
- Biavicularium [Cheilostomata]
- Bibradya [Foraminifera]
- Bibucia, Roberts 1963 [Pyrgiidae]
- Bicatillus, Swainson 1840 [Calyptraeidae]
- Bicavea [Cyclostomata]
- Bicella, Cooper 1989 [Ptychopariida]
- Bicepsirhynchia, Shi 1990 [Cyclothyrididae]
- Bichilina, Sarv 1959 [Bolliidae]
- Bicia, Walcott 1901 [Obolellidae]
- Bicidiocrinus, Strimple 1975 [Cladida]
- Bicingulites, Ljaschenko 1969 [Turmalitidae]
- Bickmorites, Foerste 1925 [Barrandoceratidae]
- Bicolumnostratum, Stock 1998 [Actinostromatidae]
- Biconcava [Mayncinidae]
- Biconostrophia [Carinatinidae]
- Biconulites, de Chardin 1931 [Problematica]
- Bicorbula, Fischer 1887 [Corbulidae]
- Bicornella, Coryell and Cuskley 1934 [Aechminellidae]
- Bicornellina [Palaeocopida]
- Bicornifera [Problematica]
- Bicornifera [Cheilostomata]
- Bicornipyge, Lisogor 1961 [Trilobita]
- Bicornucopina, Hofmann 1912 [Monopleuridae]
- Bicornucythere [Podocopida]
- Bicoronipora [Cyclostomata]
- Bicoscinus [Kazakhstanicyathida]
- Bicrenucula [Nuculida]
- Bicrenula [Nuculida]
- Bicrisia [Cyclostomata]
- Bicrisina [Cyclostomata]
- Bicuspina, Havlicek 1950 [Triplesiidae]
- Bideirella [Palaeocopida]
- Bidentatus [Theodossiidae]
- Bidiastopora [Cyclostomata]
- Bidjinella, Repina 1964 [Chengkouiidae]
- Bienella, Lochman 1944 [Corynexochida]
- Bienvillia, Clark 1924 [Olenidae]
- Biernatella [Athyrididae]
- Biernatia, Holmer 1989 [Biernatidae]
- Biernatium [Mystrophoridae]
- Bifarilaminella [Foraminifera]
- Bifarina [Foraminifera]
- Bifarinella [Foraminifera]
- Bifariostroma, Khalfina 1968 [Actinostromatidae]
- Bifaxaria, Busk 1884 [Bifaxariidae]
- Bifericeras [Eoderoceratidae]
- Bifida [Anoplothecidae]
- Bifidoscala, Cossmann 1888 [Epitoniidae]
- Bifissurinella [Cheilostomata]
- Biflabellaria [Cyclostomata]
- Biflustra, d'Orbigny 1852 [Membraniporidae]
- Bifolium [Thecidellinidae]
- Bifossularia, Dobrolyubova 1966 [Uraliniidae]
- Bifoveoceras, Balashov 1956 [Orthoceratinae]
- Bifurcammina [Ammodiscidae]
- Bifurcium, Fischer 1884 [Columbellidae]
- Bigenerina, d'Orbigny 1826 [Textulariidae]
- Bighornia [Streptelasmatidae]
- Biglobigerinella [Foraminifera]
- Bignotella [Spirotrichia]
- Bigotella, Cossmann 1913 [Cryptaulacidae]
- Bigotina, Cobbold 1935 [Ptychopariida]
- Bigotinella, Suvorova 1960 [Ptychopariida]
- Bigotinops, Hupe 1952 [Bigotinidae]
- Bigotites [Perisphinctidae]
- Bihenduloceras [Cephalopoda]
- Bija, Vologdin 1932 [Problematica]
- Bikocrinus, Ausich 1985 [Monobathrida]
- Bilaminella, Babanova 1964 [Rhynchonellidae]
- Bilecicrinus, Manni and Nicosia 1990 [Cyrtocrinida]
- Bilinguites, Librovitch 1946 [Reticuloceratidae]
- Bilingulogavelinella [Foraminifera]
- Bilinia, Obrhelova 1971 [Perciformes]
- Billcobbanoceras [Cephalopoda]
- Billiemia, Gregorio 1930 [Gastropoda]
- Billingsaria, Okulitch 1936 [Billingsariidae]
- Billingsites, Hyatt 1864 [Ascoceratidae]
- Bilobatia [Palaeocopida]
- Bilobissa [Gryphaeidae]
- Biloclymenia, Schindewolf 1923 [Biloclymeniidae]
- Biloculinella [Hauerinidae]
- Bimonilina [Foraminifera]
- Bimuria, E. O. Ulrich and Cooper 1942 [Bimuriidae]
- Bimuropora [Trepostomida]
- Binatisphinctes [Cephalopoda]
- Bingeria, Martinsson 1962 [Leperditicopida]
- Binkhorstia, Noetling 1881 [Longusorbiidae]
- Binneyites [Cephalopoda]
- Binodaspis, Lermontova 1951 [Ptychopariidae]
- Binodella [Palaeocopida]
- Binodina [Palaeocopida]
- Bioistodina [Problematica]
- Biokovina [Foraminifera]
- Biolgina, Maksimova 1955 [Bathyuridae]
- Biorbis [Foraminifera]
- Biovicella [Cyclostomata]
- Bipallicyathus [Ajacicyathida]
- Biparietata [Foraminifera]
- Biphyllum, Fedorowski 1971 [Aulophyllidae]
- Biplanata [Foraminifera]
- Biplanispira [Foraminifera]
- Biplex, Perry 1811 [Ranellidae]
- Biplica, Popenoe 1957 [Ringiculidae]
- Biplices [Cephalopoda]
- Bipygmaeus [Serpulimorpha]
- Biradiolites, d'Orbigny 1850 [Radiolitidae]
- Birdsallella [Metacopida]
- Bireophax [Hormosinidae]
- Birgeria, E. Stensiö 1919 [Birgeriidae]
- Birkenia [Birkeniiformes]
- Birkeniiformes, order [Cephalaspidomorphi]
- Birkenmajeria, Wids and De Wever 1993 [Obeliscoitidae]
- Birmanites, Sheng 1934 [Asaphidae]
- Birostrina, De Luc and J. Sowerby 1821 [Inoceramidae]
- Bisacculus [Palaeocopida]
- Biscoia, Salmon 1962 [Ptychopariida]
- Biselenaria [Cupuladriidae]
- Biseptum [Gypidulidae]
- Biseriammina [Foraminifera]
- Biseriella [Biseriamminidae]
- Bishanopliosaurus, Dong 1980 [Rhomaleosauridae]
- Bisidmonea [Cyclostomata]
- Bisinocoelia [Ambocoeliidae]
- Bisonoceras, Flower 1964 [Endocerida]
- Bispathodus [Polygnathidae]
- Bisphaera [Bisphaeridae]
- Bisphaerocephalina, Petrushevskaya 1965 [Cannobotryidae]
- Bisphenella [Palaeocopida]
- Bispinitia [Leperditicopida]
- Bispiranella [Milioliporidae]
- Bissylentactinia, Nazarov 1975 [Spumellaria]
- Bistomiacystis [Paracrinoidea]
- Bistramia, Hoek 1912 [Lingulida]
- Bistrialites, Turner 1954 [Liroceratidae]
- Bisulcata, Boucot and Johnson 1979 [Pentameridae]
- Bisulcina [Cancellothyrididae]
- Bisulcocypris [Podocopida]
- Bisulcoentomozoe [Myodocopida]
- Bitaunioceras, Shimizu and Obata 1936 [Spyroceratidae]
- Bitaxia [Foraminifera]
- Bitectipora [Cheilostomata]
- Bithecocamara [Camaroidea]
- Biticinella [Foraminifera]
- Bitraria, Galle and Weyer 1973 [Laccophyllidae]
- Bittiolum, Cossmann 1906 [Cerithiidae]
- Bittiscala, Finlay and Marwick 1937 [Potamididae]
- Bittium, Gray 1847 [Cerithiidae]
- Bittneria [Pterioida]
- Bituberitina [Foraminifera]
- Bitubigera [Cyclostomata]
- Bitubulogenerina [Foraminifera]
- Bitumulina, Osmolska 1970 [Proetida]
- Bivallupus, Pessagno and MacLeod 1987 [Pantanelliidae]
- Bivestis [Cyclostomata]
- Bivia, Berdan 1976 [Leperditicopida]
- Biwaella [Schubertellidae]
- Blabe, White 1936 [Perciformes]
- Blackdownia, Kollmann 1976 [Neogastropoda]
- Blackwelderia, Walcott 1906 [Damesellidae]
- Blackwelderioides, Hupe 1953 [Damesellidae]
- Blaculla, Munster 1839 [Decapoda]
- Blagraveia [Cardiida]
- Blainia, Walcott 1916 [Asaphiscidae]
- Blainiopsis, Poulson 1947 [Ptychopariida]
- Blairella, Miller and Gurley 1896 [Cardiida]
- Blairocrinus, Miller 1891 [Monobathrida]
- Blakeoceras, Foerste 1926 [Nothoceratidae]
- Blancia, Bourguignat 1875 [Cephalaspida]
- Blandiaspis, Qian 1983 [Corynexochida]
- Blandicephalus, Palmer 1955 [Dikelocephalidae]
- Blanforidceras [Cephalopoda]
- Blanodalmanites, Kobayashi and Hamada 1972 [Phacopida]
- Blasicrura, Iredale 1934 [Cypraeidae]
- Blastammina [Psammosphaeridae]
- Blastinia, Zittel 1878 [Stellispongiidae]
- Blastinoidea [Pharetronida]
- Blastocerina, Flower 1940 [Brevicoceratidae]
- Blastochaetetes, Dietrich 1919 [Chaetetidae]
- Blastocystis [Parablastoidea]
- Blastoidea, subclass, Say 1825 [Echinodermata]
- Blastoidocrinus, Billings 1859 [Parablastoidea]
- Blastolepas, Drushchits and Zevina 1969 [Cirripedia]
- Blastosmilia, Etallon 1859 [Axosmiliidae]
- Blastulospongia [Calcarea]
- Blayacina, Cobbold 1932 [Trilobita]
- Blefuscuiana [Foraminifera]
- Blepharipoda [Decapoda]
- Bleshidium [Camerellidae]
- Bleta [Bivalvia]
- Blochius, Volta 1800 [Blochiidae]
- Blothrocrinus, Kirk 1940 [Glossocrinidae]
- Blothrocyathus, Wells 1932 [Aulastraeoporidae]
- Blothrophyllum, Billings 1859 [Halliidae]
- Blountia, Walcott 1916 [Kingstoniidae]
- Blountiella, Resser 1938 [Asaphiscidae]
- Blowiella [Foraminifera]
- Blysmatophyllum, Pedder 1970 [Endophyllidae]
- Blystagnostus, Opik 1961 [Agnostida]
- Bobasatraniiformes, order () [Actinopteri]
- Bobastraniiformes, order [Actinopterygii]
- Bobbichthys [Pachycormiformes]
- Bobiesipora [Cyclostomata]
- Bobinella [Tetralobulidae]
- Bochianites, Lory 1898 [Bochianitidae]
- Bodenbenderia, Harrington and Leanza 1957 [Leiostegiidae]
- Bodenia [Palaeocopida]
- Bodeniella [Palaeocopida]
- Bodianus, Bloch 1790 [Perciformes]
- Bodieceras [Tarphycerida]
- Bodrakella [Pontisiidae]
- Bodylevskites [Polyptychitidae]
- Boeckaspis, Henningsmoen 1955 [Olenidae]
- Boeckelericambria [Maxillopoda]
- Boehmiola [Heterostrophia]
- Boehmoceras, Riedel 1931 [Baculitidae]
- Boesites, Miller and Furnish 1940 [Daraelitidae]
- Boettgeriola [Neogastropoda]
- Boeuvia, Chavan 1948 [Lucinidae]
- Bogdanoceras, Ruzhencev and Bogoslovskaya 1971 [Homoceratidae]
- Boggsia, Olsson 1929 [Melanopsidae]
- Bogimbailites, Bondarenko 1966 [Taeniolitidae]
- Bogoslovskya [Orthocerida]
- Bogotacrinus, Schmidt 1934 [Monobathrida]
- Bogushella [Foraminifera]
- Bohaispira, Youluo 1978 [Bohaispiridae]
- Bohaispiropsis, Youluo 1978 [Bohaispiridae]
- Bohemaspis, Horbringer 1986 [Asaphida]
- Bohemiaecystis [Cornuta]
- Bohemicocrinus, Jahn 1893 [Monobathrida]
- Bohemiella, Schuchert and Cooper 1931 [Bohemiellidae]
- Bohemilla, Barrande 1872 [Bohemillidae]
- Bohemiproetus, Pillet 1969 [Proetidae]
- Bohemirhynchia [Tetrarhynchiidae]
- Bohemites [Orthocerida]
- Bohemobolbina [Palaeocopida]
- Bohemograptus, P?ibyl 1967 [Graptoloidea]
- Bohemoharpes, Vanek 1963 [Harpetidae]
- Bohemopyge, Pribyl 1951 [Asaphidae]
- Bohemoscolex [Palaeoscolecida]
- Bohlenatia [Bairdiidae]
- Boicinetes [Chonetidae]
- Boikothalamia [Verticillitida]
- Boiomytilus [Pterioida]
- Bojarinovia, Aksarina 1978 [Naukatidae]
- Bojarkaella [Ichthyolariidae]
- Bojocoryphe, Snajdr 1976 [Tropidocoryphidae]
- Bojocyclus, Prantl 1939 [Palaeocyclidae]
- Bojodouvillina [Douvillinidae]
- Bojoscutellum, Snajdr 1958 [Styginidae]
- Bojothyris, Havlicek 1959 [Xenomartiniidae]
- Bokkeveldia [Mitrata]
- Bolaspidella, Resser 1937 [Menomoniidae]
- Bolaspidellus, Lazerenko and Datsenko 1967 [Ptychopariida]
- Bolaspidina, Lermontova 1960 [Ptychopariidae]
- Bolaspis, Resser 1935 [Bolaspididae]
- Bolbibollia, Ulrich and Bassler 1923 [Beyrichiidae]
- Bolbilithis [Palaeocopida]
- Bolbineossia, Kesling et al. 1958 [Beyrichiidae]
- Bolbiprimitia, Kay 1940 [Beyrichiidae]
- Bolbocara, Jordan 1927 [Macrouridae]
- Bolbocephalus, Whitfield 1890 [Bathyuridae]
- Bolbocrinus, Wanner 1916 [Cladida]
- Bolboparia, Rasetti 1966 [Weymouthiidae]
- Bolbopisthia [Palaeocopida]
- Bolboporites [Anthozoa]
- Bolboporites, Pander 1830 [Eocrinoidea]
- Bolbozoe [Myodocopida]
- Bolbozoella [Podocopida]
- Bolcanguilla, Blot 1981 [Anguilliformes]
- Bolcyrus, Blot 1978 [Congridae]
- Boldella [Podocopida]
- Boldia [Foraminifera]
- Boletechinus [Echinoidea]
- Boletzkida, order [Cephalopoda]
- Boletzkyidae, family [Boletzkida]
- Bolgarithyris [Capillithyrididae]
- Bolicrinus, Witzke and Strimple 1981 [Monobathrida]
- Bolidium, Zittel 1878 [Azoricidae]
- Bolinichthys, Paxton 1972 [Myctophidae]
- Bolinus (Pusch 1837) [Muricidae]
- Bolis, Gardner 1939 [Neogastropoda]
- Bolitheca, Marek and Isaacson 1992 [Orthothecida]
- Boliviacrinus, McIntosh 1988 [Monobathrida]
- Bolivianaspis, Branisa and Vanek 1973 [Phacopida]
- Bolivina, d'Orbigny 1839 [Bolivinidae]
- Bolivinella [Foraminifera]
- Bolivinellina [Foraminifera]
- Bolivinita [Bolivinitidae]
- Bolivinoides [Foraminifera]
- Bolivinopsis, Yaklovlev 1891 [Textulariidae]
- Boliviproetus, Eldredge and Ormiston 1979 [Proetida]
- Bolivosteus, Goujet et al. 1986 [Rhenanida]
- Bolkarina [Foraminifera]
- Bollandia, F.R.C. Reed 1943 [Proetidae]
- Bollandites, Bisat 1952 [Maxigoniatitidae]
- Bollandoceras, Bisat 1952 [Maxigoniatitidae]
- Bollandocrinus [Cladida]
- Bollia, Jones and Holl 1886 [Bolliidae]
- Bolliaphores [Palaeocopida]
- Bolliella [Foraminifera]
- Bolloceras, Foerste 1926 [Nothoceratidae]
- Bolma, Risso 1826 [Turbinidae]
- Bolojerea [Demospongea]
- Bolospongia [Demospongea]
- Boltenella, B. Wade 1917 [Fasciolariidae]
- Boltovskoyella [Foraminifera]
- Bomakellia, M. A. Fedonkin 1985 [Erniettamorpha]
- Bombur, Munster 1839 [Penaeidae]
- Bomina, Korovnik and Ushatinskaya 1994 [Botsfordiidae]
- Bonata, Fedonkin 1980 [Medusae]
- Bondarevites, Lazarenko 1989 [Trilobita]
- Bondonella [Neltneriidae]
- Bonellitia, Jousseaume 1887 [Cancellariidae]
- Bonnaria, Lochman 1956 [Dorypygidae]
- Bonnaspis, Resser 1936 [Corynexochidae]
- Bonnemaia, Ulrich and Bassler 1923 [Palaeocopida]
- Bonneprimites [Palaeocopida]
- Bonnetella, Cossmann 1918 [Archaeogastropoda]
- Bonneterrina, Lochmann 1936 [Cedariidae]
- Bonnia, Walcott 1916 [Dorypygidae]
- Bonniella, Resser 1937 [Dorypygidae]
- Bonniopsis, Poulsen 1946 [Dorypygidae]
- Bontaea [Pholadomyida]
- Boolelasma, Pedder 1967 [Laccophyllidae]
- Boops, Cuvier 1814 [Perciformes]
- Booralia [Cryptonellidae]
- Boothaspis, Broad 1973 [Cyathaspidida]
- Borchgrevingkium [Merostomata]
- Borcobolbina [Palaeocopida]
- Bordenia, Greene 1901 [Amplexidae]
- Boreadocamara [Camerellidae]
- Borealaspis, Ludvigson 1976 [Cheiruridae]
- Borealia, Maksimova 1977 [Proetida]
- Borealicornus [Hyolithida]
- Borealirhynchia, Su 1976 [Rhynchonellida]
- Borealis, Boucot et al. 1971 [Virgianidae]
- Boreas [Trypostegidae]
- Boreasina [Cheilostomata]
- Boreichthys, Selezneva 1982 [Perleidiformes]
- Boreionectes, Zakharov 1965 [Pectinidae]
- Borelis, Montfort 1808 [Alveolinidae]
- Boreloides [Foraminifera]
- Boreocomitas [Neogastropoda]
- Boreomeekoceras [Proptychitidae]
- Boreoscutellum, Pribyl and Vanek 1972 [Corynexochida]
- Boreotrophon, Fischer 1884 [Muricidae]
- Borichthys [Palaeonisciformes]
- Boriesia [Pholadomyida]
- Borissia [Nuculida]
- Borissiakoceras [Binneyitidae]
- Borkinia [Clymeniida]
- Borkopleura, Snajdr 1984 [Odontopleuridae]
- Bornemannaspis, Rasetti 1972 [Redlichiida]
- Bornhardticeras, Böhm and Riedel 1933 [Oppeliidae]
- Bornhardtina [Stringocephalidae]
- Bornholmaspis, Pribyl and Vanek 1983 [Phacopida]
- Bornia [Kelliidae]
- Borniola, Iredale 1924 [Erycinidae]
- Borocyathus [Ajacicyathida]
- Borodiella [Ostracoda]
- Borodinia [Foraminifera]
- Borogothus, Tjernvik 1956 [Asaphida]
- Borovitchella [Podocopida]
- Borsonella, Dall 1908 [Turridae]
- Borsonia, Bellardi 1839 [Turridae]
- Borthaspis, Stubblefield 1951 [Asaphida]
- Borua [Taffiidae]
- Boschchekulia, Lermontova 1951 [Asaphida]
- Bositra [Posidoniidae]
- Bosniella [Foraminifera]
- Bosnites, Hauer 1896 [Noritidae]
- Bosquetella [Thecidellinidae]
- Bosquetia [Podocopida]
- Bosquetina [Podocopida]
- Bostrichopus [Arthropoda]
- Bostrychoceras, Hyatt 1900 [Nostoceratidae]
- Bostrychoceras [Cephalopoda]
- Bostryclavus [Isorophida]
- Bothoteca [Demospongea]
- Bothrochlaenia [Demospongea]
- Bothroclisia, Fomichev 1953 [Bothrophyllidae]
- Bothrocorbula, Gabb 1873 [Corbulidae]
- Bothrolemma, Schrammen 1924 [Platychoniidae]
- Bothrophoria, Felix 1909 [Turbinoliidae]
- Bothrophyllum, Trautschold 1879 [Bothrophyllidae]
- Bothryopneutes [Cassiduloida]
- Bothus, Rafinesque 1810 [Pleuronectiformes]
- Boticium [Draboviidae]
- Botocyathus [Ajacicyathida]
- Botomella, Suvorova 1958 [Dinesidae]
- Botrioides, Stetson 1927 [Trinucleidae]
- Botroclonium, Pocta 1883 [Craticulariidae]
- Botryceras [Endocerida]
- Botryllopora [Cystoporata]
- Botryocampe, Ehrenberg 1860 [Cannobotryidae]
- Botryocella [Nassellaria]
- Botryocrinus, Angelin 1878 [Botryocrinidae]
- Botryocyrtis, Ehrenberg 1860 [Cannobotryidae]
- Botryodictya [Reticulosa]
- Botryopyle, Haeckel 1881 [Cannobotryidae]
- Botryostrobus, Haeckel 1887 [Artostrobiidae]
- Bottonaecyathus [Archaeocyathida]
- Botula, Mörch 1853 [Mytilidae]
- Botulobolbina [Palaeocopida]
- Botulopsis, Reis 1926 [Mytilidae]
- Boucaulticeras, Spath 1924 [Schlotheimiidae]
- Boucekites [Ostracoda]
- Bouchardia, Davidson 1850 [Bouchardiidae]
- Bouchardiella [Bouchardiidae]
- Boucia [Myodocopida]
- Boucotella [Eatoniidae]
- Boucotia, Gill 1969 [Spiriferida]
- Boucotides [Clorindidae]
- Boucotinskia, Brunton and Cocks 1967 [Cyrtinopsidae]
- Boucotstrophia [Strophodontidae]
- Bouleia, Kozlowski 1923 [Calmoniidae]
- Bouleiceras [Hildoceratidae]
- Bouleigmus [Pterioida]
- Boultonia, Lee 1927 [Schubertellidae]
- Bounyongia, Etheridge and Mitchell 1917 [Odontopleurida]
- Bourgetia (Deshayes 1871) [Gastropoda]
- Bourgueticrinida, order [Isocrinida]
- Bourgueticrinus, Orbigny 1840 [Isocrinida]
- Bournonia, Fischer 1887 [Radiolitidae]
- Bovicornellum [Problematica]
- Bovicornu [Thecosomata]
- Bowanophyllum, McLean and Webby 1976 [Tryplasmatidae]
- Bowdenagaza [Archaeogastropoda]
- Bowdenatheca [Cavoliniidae]
- Bowdenia, Dall 1903 [Cuspidariidae]
- Bowenelasma, Scrutton 1973 [Streptelasmatidae]
- Bowlandia [Pholadomyida]
- Bowmania, Walcott 1925 [Harpetidae]
- Bozorginiella [Foraminifera]
- Bozshakolia, Ushatinskaya et al. 1986 [Ceratretidae]
- Brabeocrinus, H.L. Strimple and R.C. Moore 1971 [Cladida]
- Bracebridgia, MacGillivray 1886 [Adeonidae]
- Brachaelurus, Ogilby 1906 [Orectolobiformes]
- Brachidontes, Swainson 1840 [Mytilidae]
- Brachiocrinus, Hall 1858 [Crinoidea]
- Brachiograptus [Graptoloidea]
- Brachiomonocrinus, Arendt 1974 [Cyrtocrinida]
- Brachionichthys, Bleeker 1855 [Brachionichthyidae]
- Brachiopoda, phylum, Cuvier 1805 [Lophophorata]
- Brachiospongia, Marsh 1867 [Brachiospongiidae]
- Brachiospyris, Haeckel 1881 [Triospyrididae]
- Brachopterella (Kjellesvig-Waering 1966) [Eurypterida]
- Brachyaspidion, Miller 1936 [Kingstoniidae]
- Brachybelus [Belemnitida]
- Brachycerithium, Bonarelli 1921 [Gastropoda]
- Brachycoenia, Beauvais 1982 [Haplaraeidae]
- Brachycyathus [Caryophylliidae]
- Brachycycloceras, Miller et al. 1933 [Brachycycloceratidae]
- Brachycytheropteron [Ostracoda]
- Brachydeirus, Koenen 1880 [Arthrodira]
- Brachydeuterus, Gill 1862 [Perciformes]
- Brachylepas [Cirripedia]
- Brachymeandra, Alloiteau 1957 [Haplaraeidae]
- Brachymeris, Conrad 1873 [Ungulinidae]
- Brachymimulus [Triplesiidae]
- Brachymylus, Smith Woodward 1894 [Callorhinchidae]
- Brachynotus, De Haan 1833 [Varunidae]
- Brachyopterus [Eurypterida]
- Brachyosteus, Jaeckel 1927 [Arthrodira]
- Brachypareion, Kazantseva-Selezneva 1980 [Palaeonisciformes]
- Brachyphyllia, Reuss 1854 [Latomeandridae]
- Brachyprion, Shaler 1865 [Leptostrophiidae]
- Brachypterygius, Huene 1922 [Ophthalmosauridae]
- Brachyrhizodus [Petalodontiformes]
- Brachyschisma, I. G. Reimann 1945 [Brachyschismatidae]
- Brachyseris, Alloiteau 1947 [Latomeandridae]
- Brachysiphon [Saccamminidae]
- Brachysoecia [Cyclostomata]
- Brachysphingus, Gabb 1869 [Neogastropoda]
- Brachyspirifer [Hysterolitidae]
- Brachystoma, Meigen 1822 [Turridae]
- Brachystomia, Monterosato 1884 [Pyramidellidae]
- Brachythyrina [Choristitidae]
- Brachythyrinella [Trigonotretidae]
- Brachytoma, Swainson 1840 [Turridae]
- Brachytrema, Morris and Lycett 1851 [Brachytrematidae]
- Brachyzyga [Meganterididae]
- Brackebuschia, Harrington and Leanza 1957 [Leiostegiidae]
- Bractea, Oliver 1975 [Favositidae]
- Bractechlamys, Iredale 1939 [Pectinidae]
- Bracteoleptaena [Rafinesquinidae]
- Bractocyathus [Ajacicyathida]
- Bracytrochus [Caryophylliidae]
- Braderupia [Palaeocopida]
- Bradfordia [Oppeliidae]
- Bradfordirhynchia [Rhynchonellidae]
- Bradfordoceras, Flower and Caster 1935 [Pseudorthoceratidae]
- Bradocryphaeus, W. Haas and H. Mensink 1970 [Acastidae]
- Bradoria, Mathew 1899 [Bradoriidae]
- Bradyfallotaspis, Fritz 1972 [Archaeaspididae]
- Bradyina [Bradyinidae]
- Bradyphyllum, Grabau 1928 [Antiphyllidae]
- Brahcylyrodesma [Modiomorphida]
- Brahimorthis, Havlícek 1971 [Eoorthidae]
- Brahmacrinus, Sollas 1900 [Monobathrida]
- Brahmaites [Kossmaticeratidae]
- Braiesopora [Cyclostomata]
- Braintreella, Wheeler 1942 [Ptychopariidae]
- Brama, Walbaum 1792 [Perciformes]
- Bramertonia, Harmer 1923 [Archaeogastropoda]
- Bramkampella [Foraminifera]
- Brancasaurus, Wegner 1914 [Leptocleididae]
- Branchiocarcinus, Vega et al. 1995 [Carcineretidae]
- Branchiocaris, Briggs 1976 [Protocaridida]
- Branchiopoda, class, Latreille 1817 [Crustacea]
- Branchiostegus, Rafinesque 1815 [Perciformes]
- Brancoceras, Steinmann 1881 [Brancoceratidae]
- Brandysia [Cremnorthidae]
- Brandysops, Horbringer 1986 [Asaphida]
- Branikia [Theodossiidae]
- Branislavia [Hippuritida]
- Branmehlia [Conodontophorida]
- Brannerion, Jordan 1920 [Anguilliformes]
- Branneroceratoides [Entogonitidae]
- Brasilia [Graphoceratidae]
- Brasiliella [Squamulinidae]
- Brasilioproductus [Productidae]
- Brassicicephalus, Lochmann 1940 [Ptychopariida]
- Braunosteus, Stensiö 1959 [Arthrodira]
- Brebina [Austrotrillinidae]
- Bredocaris [Orstenocarida]
- Bredyia [Hammatoceratidae]
- Bregmacerina, Danil'chenko 1957 [Bregmacerotidae]
- Bregmaceros, Thompson 1840 [Bregmacerotidae]
- Breileenia [Productellidae]
- Breizhops, Morzadec 1983 [Acastidae]
- Breizosteus, Goujet 1980 [Acanthothoraci]
- Brenckleina [Foraminifera]
- Brephocharieis [Palaeocopida]
- Brestopora [Stenolaemata]
- Breviatractites [Aulacocerida]
- Brevibelus [Belemnitida]
- Brevibolbina [Palaeocopida]
- Brevicamera [Camerellidae]
- Brevicardium, L. W. Stephenson 1941 [Cardiidae]
- Brevicoceras, Flower 1938 [Brevicoceratidae]
- Brevidorsa [Palaeocopida]
- Brevikites, Ruzhencev and Bogoslovskaya 1975 [Homoceratidae]
- Brevilabiatus [Hyolithida]
- Brevimaeandra, Babaev 1964 [Montlivaltiidae]
- Brevinucula, Thiele 1934 [Nuculidae]
- Breviorthonota [Mytilida]
- Breviphrentis, Stumm 1949 [Streptelasmatidae]
- Breviphyllum, Stumm 1949 [Streptelasmatidae]
- Breviscutellum, Snajdr 1960 [Styginidae]
- Breviseptophyllum, Ermakova 1960 [Disphyllidae]
- Breviseptum [Gypidulidae]
- Brevisiphonella [Pharetronida]
- Brevispirifer [Adolfiidae]
- Brevisulcina [Palaeocopida]
- Brevitermierella, Hupé 1953 [Trilobita]
- Brevitheca [Orthothecida]
- Breynia [Loveniidae]
- Brianellium, Cheng 1986 [Latentifistulidae]
- Brianispongia [Demospongea]
- Briantia, Barrois 1889 [Mucophyllidae]
- Briarocrinus, Angelin 1878 [Monobathrida]
- Briartina, Kegel 1932 [Leperditiidae]
- Bridegeites [Euomphalina]
- Bridgeia, Lochman 1944 [Trilobita]
- Bridgerocrinus, L. R. Laudon and J. L. Severson 1953 [Bridgerocrinidae]
- Brightia [Oppeliidae]
- Brightonia [Somaliasteridae]
- Brightonicystis [Diploporita]
- Brimethyris [Athyrididae]
- Brimosaurus, J. Leidy 1854 [Cimoliasauridae]
- Brindabellaspida, order, Young 1980 [Placodermi]
- Brindabellaspis, Young 1980 [Brindabellaspida]
- Brisaster, Gray 1855 [Schizasteridae]
- Briscoia, Walcott 1924 [Dikelocephalidae]
- Briseocrinus, Prokop and Petr 1991 [Cladida]
- Brissomorpha, Laube 1871 [Asterostomatidae]
- Brissopatagus, Cotteau 1863 [Brissidae]
- Brissopneustes [Micrasteridae]
- Brissopsis, L. Agassiz 1840 [Brissidae]
- Brissus, Gray 1825 [Brissidae]
- Brizalina, Costa 1856 [Bolivinidae]
- Brocchia, Bronn 1827 [Capulidae]
- Brocchinia [Neogastropoda]
- Brocchitas, Finlay 1927 [Fasciolariidae]
- Brochechinus [Orthopsidae]
- Brochoadmones, Bernacsek and Dineley 1977 [Acanthodii]
- Brochocarina [Orthotetidae]
- Brochopleurus [Temnopleuridae]
- Brochosogenys [Eunicemorpha]
- Brockocystis, Foerste 1914 [Rhombifera]
- Brodekoceras [Discosorida]
- Brodieia [Phymatoceratidae]
- Broeckina [Meandropsinidae]
- Broeckinella [Foraminifera]
- Broeggeria, Walcott 1902 [Elkaniidae]
- Broeggeroceras, Sweet 1958 [Westonoceratidae]
- Broeggerolithus, Lamont 1935 [Trinucleidae]
- Bromidella [Palaeocopida]
- Bromidocrinus, Kolata 1982 [Diplobathrida]
- Bronaughocrinus, Strimple 1951 [Cladida]
- Brongniartella, Reed 1918 [Homalonotidae]
- Bronicella [Medusae]
- Bronnimannia [Foraminifera]
- Bronnothyris [Megathyrididae]
- Bronsteiniana [Podocopida]
- Bronteopsis, Nicholson and Etheridge 1879 [Styginidae]
- Brookesena, Finlay 1926 [Mathildidae]
- Brooksina, Kirk 1922 [Pentameridae]
- Brookula, Iredale 1912 [Turbinidae]
- Brookvalia, Wade 1933 [Redfieldiidae]
- Brosme, Rafinesque 1815 [Gadiformes]
- Brosmius, Cuvier 1829 [Gadiformes]
- Brotula [Ophidiidae]
- Brouwerites, C. Diener 1923 [Steinmannitidae]
- Brouzetia [Heterostrophia]
- Browneella [Trigonirhynchiidae]
- Browneichthys, Woodward 1889 [Palaeonisciformes]
- Bruclarkia, Trask 1926 [Neptuneidae]
- Bruennichometra, Rasmussen 1961 [Comatulida]
- Bruetia [Cardiida]
- Bruniastarte [Cardiida]
- Brunnirhyncha [Aseptorhynchiidae]
- Brunonia, Müller 1898 [Archaeogastropoda]
- Brunsia [Pseudoammodiscidae]
- Brunsiella [Foraminifera]
- Brunswickia, Howell 1937 [Ptychopariidae]
- Bruntonichthys, Dennis and Miles 1980 [Arthrodira]
- Bruntonites [Athyrididae]
- Brushenodus [Pteromidae]
- Brutaspis, Ivshin 1962 [Ptychopariida]
- Brutonia, Thomas and Holloway 1988 [Lichida]
- Brutopisocrinus, Prokop and Petr 1989 [Crinoidea]
- Bryantodina [Conodontophorida]
- Bryantodus [Prioniodidae]
- Brychaetus, Agassiz 1845 [Osteoglossidae]
- Brychiocrinus, Moore and Plummer 1940 [Cladida]
- Brydonella [Cheilostomata]
- Brylyella [Corynexochida]
- Bryochelys [Cheloniidae]
- Bryocryptella [Cheilostomata]
- Bryograptus [Dendroidea]
- Bryozoa, phylum, Ehrenberg 1831 [Polyzoa]
- Bubnoffiella [Cheilostomata]
- Bubnoffiopsis [Palaeocopida]
- Bubupeltina, Snajdr 1991 [Corynexochida]
- Bucanoides [Thecosomata]
- Bucanophyllum, Ulrich 1886 [Cystiphyllidae]
- Bucanotheca, Qian and Jiang 1980 [Orthothecida]
- Bucardiomya, Rollier 1912 [Pholadomyidae]
- Bucardium, Gray 1853 [Cardiidae]
- Buccella [Discorbidae]
- Buccicrenata [Cyclamminidae]
- Buccinanops [Nassariidae]
- Buccinaria, Kittl 1887 [Raphitomidae]
- Buccinofusus, Conrad 1868 [Fasciolariidae]
- Buccinopsis, Conrad 1857 [Buccinidae]
- Buccinorbis, Conrad 1865 [Buccinidae]
- Buccinulum, Swainson 1837 [Buccinidae]
- Buccitriton [Buccinidae]
- Bucconia, Dall 1890 [Cephalaspida]
- Buceqia [Lissatrypidae]
- Bucerella [Palaeocopida]
- Bucerobolbina [Palaeocopida]
- Buchanathyris, J.A. Talent 1956 [Athyrididae]
- Buchanosteus, Stensiö 1945 [Arthrodira]
- Bucherina [Foraminifera]
- Buchia, Rouillier 1845 [Buchiidae]
- Buchiceras, Hyatt 1875 [Acanthoceratidae]
- Buchicrinus [Isocrinida]
- Buchiproetus [Tropidocoryphidae]
- Buchnerina, Jones 1984 [Ellipsolagenidae]
- Buchotrigonia [Trigoniida]
- Buchozia [Neogastropoda]
- Buckmanina, Cossmann 1920 [Archaeogastropoda]
- Buckmanithyris [Nucleatidae]
- Bucksella, Howel 1957 [Ptychopariida]
- Budashevaella [Foraminifera]
- Buddhaites, C. Diener 1895 [Gymnitidae]
- Budnianella [Ostracoda]
- Buelowiteuthis [Aulacocerida]
- Buenellus, Blaker 1988 [Nevadiidae]
- Bueningia [Foraminifera]
- Bufanchiste [Podocopida]
- Buffalopterus [Eurypterida]
- Buffonella [Cheilostomata]
- Buffonellodes [Buffonellodidae]
- Bufina [Metacopida]
- Bufonariella, Thiele 1929 [Bursidae]
- Buglossidium, Chabanaud 1930 [Soleidae]
- Bukowskiites, C. Diener 1907 [Japonitidae]
- Bulahdelia [Productellidae]
- Bulaiaspis, Repina 1956 [Chengkouaspidae]
- Bulamicrusta [Crustoidea]
- Bulbaspis, Chugaeva 1956 [Raphiophoridae]
- Bulbihastula [Neogastropoda]
- Bulbobaculites [Foraminifera]
- Bulbobuccicrenata [Haplophragmoiidae]
- Bulbocystis [Diploporita]
- Bulbophragmium [Foraminifera]
- Bulbosclerites [Podocopida]
- Bulbosulculus [Palaeocopida]
- Bulbus, Brown 1839 [Naticidae]
- Bulimactaeon, Cossmann 1891 [Cephalaspida]
- Bulimina, d'Orbigny 1826 [Buliminidae]
- Buliminella, Cushman 1911 [Buliminidae]
- Buliminellita [Foraminifera]
- Buliminoides [Foraminifera]
- Bullaeferum [Palaeocopida]
- Bullaluta [Ostracoda]
- Bullalveolina [Alveolinidae]
- Bullata, Jousseaume 1875 [Volutidae]
- Bullatella [Palaeocopida]
- Bullatimorphites [Tulitidae]
- Bullerichthys, Dennis and Miles 1980 [Arthrodira]
- Bullia, Gray 1834 [Nassariidae]
- Bullia (Molopophorus), Gabb 1869 [Buccinidae]
- Bullina, Férussac 1822 [Cephalaspida]
- Bulliopsis [Nassariidae]
- Bullopora, Quenstedt 1856 [Polymorphinidae]
- Bullopsis, Conrad 1858 [Bullidae]
- Bullothyris [Terebratulida]
- Bullulodictyon, Yavorsky 1967 [Clathrodictyidae]
- Bulnibarbi [Ptychopariida]
- Bulogites, G. v. Arthaber 1912 [Balatonitidae]
- Bulovia [Neogastropoda]
- Bulvankeriphyllum, Goryanov 1966 [Kodonophyllidae]
- Bumastides, Veber 1948 [Asaphida]
- Bumastus, Murchison 1839 [Illaenidae]
- Bunaia [Planaterga]
- Bunburyiceras [Cephalopoda]
- Bundenbachiellus [Arthropoda]
- Bundenbachochaeta [Polychaeta]
- Bungartius, Dunkle 1947 [Arthrodira]
- Bungoella [Cardiida]
- Bunodella [Xiphosurida]
- Bunodes [Planaterga]
- Buntoxia [Echinoconchidae]
- Bunyerichnus, Glaessner 1969 [Ichnofossils]
- Burbonella [Palaeonisciformes]
- Burckhardites, Humphrey 1949 [Desmoceratidae]
- Burckhardtia [Pterioida]
- Burdigalocrinus, Jaekel 1918 [Comatulida]
- Buregia [Palaeocopida]
- Burenoceras, Ulrich and Foerste 1931 [Ellesmeroceratidae]
- Burgessia [Arthropoda]
- Burgessochaeta [Annelida]
- Burgundia, Dehorne 1916 [Burgundiidae]
- Buria, Morozova and Zharnikova 1984 [Cyclostomata]
- Burmeisterella, Reed 1918 [Phacopida]
- Burmeisteria, Salter 1865 [Homalonotidae]
- Burmesia [Burmesiidae]
- Burnetiella, Lochmann 1958 [Dokimocephalidae]
- Burnhamia, Cappetta 1976 [Myliobatidae]
- Burrinijucosteus [Arthrodira]
- Burrirhynchia, Owen 1962 [Tetrarhynchiidae]
- Burronoceras [Cephalopoda]
- Bursa, Roding 1798 [Bursidae]
- Bursachitina [Rhizopodea]
- Bursacrinus, Meek and Worthen 1861 [Cladida]
- Bursata [Polyplacophora]
- Burseolina [Foraminifera]
- Burtinella, Mörch 1861 [Vermetidae]
- Burtinia, Van Beneden 1873 [Perciformes]
- Burtonops, Struve 1990 [Phacopida]
- Buryella, Foreman 1973 [Eucyrtidiidae]
- Buscotypus [Gastropoda]
- Buskia [Ctenostomata]
- Buskopora [Cystoporata]
- Busnardoites, Nikolov 1966 [Neocomitidae]
- Bussonastraea (Bauvais 1965) [Amphiastreidae]
- Busuanga, Yeh 1990 [Pentactinocarpidae]
- Busycon, Röding 1798 [Melongenidae]
- Busycon (Busycoptypus) [unclassified subgenus]
- Busycon (Echinofulgur), Olsson and Harbison 1953 [Melongenidae]
- Busycotypus [Melongenidae]
- Butakovicyathus [Monocyathida]
- Butkovia [Anoplothecidae]
- Butovia [Cribricyathea]
- Butovicella, J. Kríž 1965 [Modiomorphidae]
- Buttsia, Wilson 1951 [Catillicephalidae]
- Buttsoceras, Ulrich and Foerste 1933 [Troedssonellidae]
- Buvignieria, Cossmann 1921 [Rissoidae]
- Buxtonia [Productidae]
- Buxtoniella [Echinoconchidae]
- Buxtonioides, Mendes 1959 [Productidae]
- Buzasina [Haplophragmoididae]
- Bvalbardites [Ptychopariida]
- Bykovaeina [Psammosphaeridae]
- Bykoviella, Korcheagin 1964 [Adercotrynidae]
- Bylgia, Munster 1839 [Decapoda]
- Bynguanoia [Naukatidae]
- Bynumia, Walcott 1924 [Kingstoniidae]
- Bynumiella, Resser 1942 [Kingstoniidae]
- Bynumina, Resser 1942 [Kingstoniidae]
- Byronia [Hyolithelminthes]
- Byronoceras, Foerste and Savage 1927 [Acleistoceratidae]
- Byrsolopsina [Palaeocopida]
- Byssocardium [Cardiidae]
- Byssomera [Cardiida]
- Byssonychia, Ulrich 1893 [Ambonychiidae]
- Byssopteria, J. Hall 1883 [Ambonychiidae]
- Bystromena, Williams 1974 [Glyptomenidae]
- Bythiamena [Cardiida]
- Bythoceratina [Podocopida]
- Bythocypris, Brady 1880 [Bythocyprididae]
- Bythocyproidea [Metacopida]
- Bythocythere [Podocopida]
- Bythocytheromorpha [Podocopida]
- Bythopora, Miller and Dyer 1878 [Batostomellidae]
- Bythotrypa, Ulrich 1893 [Ceramoporidae]
- Cabania [Neogastropoda]
- Caberea [Candidae]
- Caberoides [Catenicellidae]
- Caborcella, Lochmann 1948 [Ptychopariidae]
- Cabralista [Cardiida]
- Cabrievoceras (Bogoslovsky 2002) [Werneroceratidae]
- Cacemia [Heterorthidae]
- Cacheoceras [Endocerida]
- Cactocrinus, Wachsmuth and Springer 1897 [Monobathrida]
- Cactograptus [Graptolithina]
- Cadella, Dall et al. 1938 [Tellinidae]
- Cadisocrinus [Diplobathrida]
- Cadniacyathus [Ajacicyathida]
- Cadoceras [Cardioceratidae]
- Cadocrinus, Wanner 1924 [Cladida]
- Cadomella [Rhynchonellata]
- Cadomia, Goarant de Tromelin 1877 [Malletiidae]
- Cadomites [Cephalopoda]
- Cadomoceras [Cephalopoda]
- Cadudium [Gypidulidae]
- Cadulus, Philippi 1844 [Gadilidae]
- Caecum, Fleming 1813 [Caecidae]
- Caecum (Brochina) (Gray 1837) [Caecidae]
- Caelocrinus [Cladida]
- Caenisites [Asteroceratidae]
- Caenocidaris [Psychocidaridae]
- Caenocyclus, Schindewolf 1922 [Pericyclidae]
- Caenodontus [Conodontophorida]
- Caenotreta [Biernatidae]
- Caesariella [Nuculida]
- Caesia, H. Adams and A. Adams 1853 [Nassariidae]
- Caesio, Lacépède 1802 [Lutianidae]
- Caestocorbula, Vincent 1910 [Corbulidae]
- Caeus, Costa 1853 [Gonorhynchiformes]
- Caganaspis, Kolobova 1968 [Asaphida]
- Cagaster [Spatangoida]
- Cahabagnathus [Conodontophorida]
- Cainatops, Matthew 1899 [Ptychopariida]
- Cainoceras, van Hoepen 1942 [Brancoceratidae]
- Cainocrinus, Forbes 1852 [Isocrinida]
- Calacanthopora [Trepostomata]
- Calaiceras [Phylloceratidae]
- Calameastolia [Scleractinia]
- Calamocrinus, Agassiz 1890 [Cyrtocrinida]
- Calamograptus [Graptoloidea]
- Calamophyllia, Blainville 1830 [Calamophylliidae]
- Calamophylliopsis, Alloiteau 1952 [Dermosmiliidae]
- Calamoseris, Alloiteau 1952 [Calamophylliidae]
- Calamotrypa [Trepostomida]
- Calamus, Swainson 1839 [Perciformes]
- Calantica, Gray 1825 [Calanticidae]
- Calapoecia, Billings 1865 [Syringophyllidae]
- Calappa, Weber 1795 [Calappidae]
- Calappilia, A. Milne Edwards 1873 [Calappidae]
- Calathiscus [Lychniscosa]
- Calathospongia [Lyssacinosida]
- Calcarata, Jousseaume 1887 [Cancellariidae]
- Calcarea, class, Bowerbank 1864 [Porifera]
- Calcaribeyrichia [Podocopida]
- Calcarina [Calcarinidae]
- Calcaronea, order, Bidder 1898 [Calcarea]
- Calceochiton [Mattheviidae]
- Calceocrinus, Hall 1852 [Crinoidea]
- Calceola, Lamarck 1799 [Goniophyllidae]
- Calchasiceras [Oncocerida]
- Calcihexactina, Sdzuy 1969 [Hyalostellidae]
- Calcistella [Hadromerida]
- Calcitheca [Hyolithomorpha]
- Calcitornella [Cornuspiridae]
- Calcitrapessa [Neogastropoda]
- Calcivertella [Cornuspiridae]
- Caldenocrinus [Sagenocrinida]
- Caleidocrinus, Jahn 1893 [Crinoidea]
- Calhounoceras, Troedsson 1926 [Actinocerida]
- Caliapora, Schlüter 1889 [Alveolitidae]
- Calicantharus, Clark 1938 [Buccinidae]
- Caliculospongia [Porifera]
- Califodesma [Cardiida]
- Californiceras [Cephalopoda]
- Californosaurus, Kuhn 1934 [Californosauridae]
- Caligella [Caligellidae]
- Calilampus [Cassiduloida]
- Calinastrea [Anthozoa]
- Calix, Rouault 1878 [Diploporita]
- Callaionautilus, Kieslinger 1924 [Clydonautilidae]
- Callanaitis, Iredale 1917 [Veneridae]
- Callaspis, Zhang 1983 [Asaphida]
- Callavia, Matthew 1897 [Holmiidae]
- Callianassa, Leach 1814 [Callianassidae]
- Callicalyptella, Boucot and Johnson 1972 [Spiriferida]
- Calliconites [Aulacocerida]
- Calliglypha [Clarkellidae]
- Callihoplites [Hoplitidae]
- Callimitra, Haeckel 1881 [Sethoperidae]
- Callinectes, W. Stimpson 1860 [Portunidae]
- Calliobasis, Marshall 1983 [Archaeogastropoda]
- Calliocrinus, Orbigny 1850 [Monobathrida]
- Calliomphalus, Cossmann 1888 [Calliotropidae]
- Calliostoma, Swainson 1840 [Trochidae]
- Calliotectum, Dall 1890 [Volutidae]
- Calliotropis, Seguenza 1903 [Eucyclidae]
- Calliphylloceras, Spath 1927 [Phylloceratidae]
- Callipleura [Machaerariidae]
- Calliprotonia [Echinoconchidae]
- Calliptychoceras [Cephalopoda]
- Callispirifer [Adolfiidae]
- Callispirina, Cooper and Muir-Wood 1951 [Paraspiriferinidae]
- Callista, Poli 1791 [Veneridae]
- Callistalox [Cardiida]
- Callistochiton, Carpenter 1879 [Neoloricata]
- Callistocythere, Ruggieri 1953 [Podocopida]
- Callithaca, Dall 1902 [Veneridae]
- Callitrigonia [Trigoniida]
- Callizoe [Archaeostraca]
- Callizoniceras [Desmoceratidae]
- Calloarca, Gray 1857 [Arcidae]
- Callocardia, A. Adams 1864 [Veneridae]
- Callochiton, Gray 1847 [Ischnochitonidae]
- Callocladia [Cryptostomata]
- Calloconularia [Conulariidae]
- Callocystites, Hall 1852 [Rhombifera]
- Callodictyon, Zittel 1877 [Callodictyonidae]
- Callognathus, Newberry 1890 [Arthrodira]
- Callograptus [Dendroidea]
- Callolongchaeus, Dall 1903 [Pyramidellidae]
- Callopegma, Zittel 1878 [Siphoniidae]
- Callopora, Gray 1848 [Calloporidae]
- Calloporella, Ulrich 1882 [Halloporidae]
- Calloporina [Microporellidae]
- Callopterus, Thollière 1854 [Eugnathidae]
- Callopteus [Semionotiformes]
- Callorhinus, J. E. Gray 1859 [Carnivora]
- Callorhynchus, Cuvier 1829 [Callorhynchidae]
- Callosphaera [Spumellaria]
- Callospiriferina [Pennospiriferinidae]
- Callotrypa [Trepostomida]
- Callucina (Dall 1901) [Lucinidae]
- Callucinopsis, Chavan 1959 [Lucinidae]
- Callusaria, Finlay 1926 [Struthiolariidae]
- Callyodon, Gronovius 1763 [Perciformes]
- Calmiussiphyllum, Vasilyuk 1959 [Bothrophyllidae]
- Calmonia, Clarke 1913 [Calmoniidae]
- Calocaria [Myodocopida]
- Calocephalites, Kurtz 1975 [Dokimocephalidae]
- Caloceras [Psiloceratidae]
- Calocidaris, H. L. Clark 1907 [Cidaridae]
- Calocyclas, Ehrenberg 1847 [Eucyrtidiidae]
- Calocycletta, Haeckel 1887 [Pterocorythidae]
- Calocycloma, Haeckel 1887 [Eucyrtidiidae]
- Calocyrtoceras, Foerste 1936 [Paraphragmitidae]
- Calodisculus, Rehder 1935 [Architectonicidae]
- Calodiscus, Howell 1935 [Calodiscidae]
- Calophos, Woodring 1964 [Nassariidae]
- Calophylloides, Ivanovskiy 1976 [Polycoeliidae]
- Calophyllum, Dana 1846 [Polycoeliidae]
- Calopora [Trepostomida]
- Calorebama, Squires 1989 [Pseudolividae]
- Calorhadia, Stewart 1930 [Nuculanidae]
- Calostylis, Lindström 1868 [Calostylidae]
- Calotomus, Gilbert 1890 [Scaridae]
- Calotrophon, Hertlein and Strong 1951 [Muricidae]
- Caloxanthus, A. Milne-Edwards 1864 [Feldmanniidae]
- Calpensia [Microporidae]
- Calpichtina [Rhizopodea]
- Calpidopora, Lang 1916 [Cheilostomata]
- Calpiocrinus [Sagenocrinida]
- Calpionella [Calpionellida]
- Calpionellida, order [Ciliophora]
- Calpionellites [Calpionellida]
- Calpionellopsis [Calpionellida]
- Calpmenella (Bergeron 1890) [Phacopida]
- Calpurna, Fleming 1828 [Ovulidae]
- Calthalotia, Iredale 1929 [Trochidae]
- Calthropella [Astrophorida]
- Calvadosiella, Wenz 1939 [Rissoidae]
- Calvaentolium [Pterioida]
- Calverturris [Neogastropoda]
- Calvetina [Cheilostomata]
- Calveziconus [Foraminifera]
- Calvezina [Robuloididae]
- Calvina [Cheilostomata]
- Calvinella, Walcott 1914 [Saukiidae]
- Calvipelta, Westrop 1986 [Kingstoniidae]
- Calvirhynchia [Erymnariidae]
- Calvustrigis [Strophopleuridae]
- Calybole, Richter 1927 [Proetida]
- Calycanthocrinus, Follmann 1887 [Crinoidea]
- Calycoblastus, J. Wanner 1924 [Spiraculata]
- Calycoceras, Hyatt 1900 [Acanthoceratidae]
- Calycocoelia, Bassler 1927 [Anthaspidellidae]
- Calycocrinus [Calycocrinidae]
- Calycospongia, Wu and Xiao 1989 [Craticulariidae]
- Calycotubus [Tuboidea]
- Calymene, Brongniart 1822 [Calymenidae]
- Calymenella, Bergeron 1890 [Calymenidae]
- Calymenidius, Rasetti 1944 [Lonchocephalidae]
- Calymmatina, Zittel 1878 [Siphoniidae]
- Calyptaulax, Cooper 1930 [Pterygometopidae]
- Calyptocoryphe [Nassellaria]
- Calyptocoscinus [Capsulocyathida]
- Calyptraea, Lamarck 1799 [Calyptraeidae]
- Calyptraea (Sigapatella), Lesson 1830 [Calyptraeidae]
- Calyptraphorus, Conrad 1857 [Rostellariidae]
- Calyptrina, Sokolov 1967 [Sabelliditida]
- Calyxdendrum [Dendroidea]
- Camagueyia [Foraminifera]
- Camaraspis, Ulrich and Resser 1924 [Pterocephaliidae]
- Camaraspoides, Frederickson 1949 [Asaphida]
- Camarium [Meristidae]
- Camarnia [Neogastropoda]
- Camarocarcinus, F. D. Holland and A. Cvancara 1958 [Camarocarcinidae]
- Camarocrinus, Hall 1879 [Monobathrida]
- Camaroidea, order [Graptolithina]
- Camarophorella [Meristidae]
- Camarophorinella [Psilocamaridae]
- Camarospira [Meristidae]
- Camarothyridina [Ladogiidae]
- Camarotoechia, Hall and Clarke 1893 [Camarotoechiidae]
- Camarotoechioides [Rhynchonellida]
- Cambarus [Decapoda]
- Cambraechmina [Ostracoda]
- Cambraster, Cabibel et al. 1958 [Edrioasteroidea]
- Cambria, Netskaya and Ivanova 1956 [Hipponicharionidae]
- Cambroblastus, Smith and Jell 1990 [Edrioasterida]
- Cambroblastus [Parablastoidea]
- Cambrocassis [Problematica]
- Cambroclavida, class, Conway Morris and Chen 1991 [Problematica]
- Cambrocrinus, Orlowski 1968 [Ascocystitida]
- Cambrocyathells [Archaeocyathida]
- Cambrogeorgina [Problematica]
- Cambromedusa [Medusae]
- Cambrooistodus [Conodontophorida]
- Cambropachycope [Arthropoda]
- Cambrophyllum [Anthozoa]
- Cambropodus [Myriapoda]
- Cambroscutum [Mollusca]
- Cambrotrophia [Eostrophiidae]
- Cambrotrypa [Anthozoa]
- Cambrunicornia, Geyer 1990 [Trilobita]
- Camdenidea [Podocopida]
- Cameleolopha [Pterioida]
- Camerella, Billings 1859 [Camerellidae]
- Camerisma [Stenoscismatidae]
- Cameroceras, T. A. Conrad 1842 [Endoceratidae]
- Camerogalerus [Discoididae]
- Camerophorina [Camerophorinidae]
- Cameroptychium, Leonhard 1897 [Coeloptychidae]
- Camerospongia, d'Orbigny 1849 [Camerospongiidae]
- Camerotheca, Mathew 1885 [Camerothecidae]
- Camerothyris [Aulacothyropsidae]
- Cammingella [Proetida]
- Campages, Hedley 1905 [Dallinidae]
- Campanelle [Heterostrophia]
- Campanellula [Foraminifera]
- Campanile, Fischer 1884 [Campanilidae]
- Campanulithus, Nazarov and Rudenko 1981 [Palacantholithidae]
- Campbelloceras, Ulrich and Foerste 1936 [Tarphyceratidae]
- Campbellodus, Miles and Young 1977 [Ptyctodontida]
- Campendoceras, Teichert and Glenister 1954 [Proterocameroceratidae]
- Campichia [Heterostrophia]
- Campodus, de Koninck 1844 [Eugeneodontiformes]
- Camponaxis [Tofanellidae]
- Camponeila [Heterostrophia]
- Campophyllum, Milne-Edwards and Haime 1850 [Campophyllidae]
- Camposcala, Bandel 1992 [Sorbeoconcha]
- Campropallus [Olenellida]
- Camptoalatus, Nazarov and Rudenko 1981 [Corythoecidae]
- Camptoceratops [Thecosomata]
- Camptochiton, M. D. Debrock et al. 1984 [Lepidopleuridae]
- Camptochlamys, Arkell 1930 [Pectinidae]
- Camptocrinus, Wachsmuth and Springer 1897 [Platycrinitidae]
- Camptocythere [Podocopida]
- Camptolithus, Lindström 1899 [Plasmoporellidae]
- Camptonectes, Meek 1864 [Pectinidae]
- Camptosalpinx [Serpulimorpha]
- Camptostroma [Coronatida]
- Camptostroma [Camptostromatoida]
- Camptostromatoida, order [Camptostromoidea]
- Camptostromoidea, class [Echinodermata]
- Campylacrum [Neogastropoda]
- Campylites [Polychaeta]
- Campylites, Rollier 1922 [Oppeliidae]
- Campylocephalus [Hibbertopteridae]
- Campyloceras, M'Coy 1844 [Pseudorthoceratidae]
- Campylocythere [Podocopida]
- Campylorthis, Ulrich and Copper 1942 [Plaesiomyidae]
- Campylostoma [Diploporita]
- Camsellia, Ormiston 1976 [Proetida]
- Camurophyllum, Kravtsov 1966 [Lykophyllidae]
- Camuropiscis, Dennis and Miles 1979 [Camuropiscidae]
- Canadapteraspis [Pteraspidomorphes]
- Canadaspidida, order, Novozhilov in Orlov 1960 [Crustacea]
- Canadaspis, Novozhilov in Orlov 1960 [Canadaspididae]
- Canadia [Annelida]
- Canadiphyllum, Sutherland 1954 [Hapsiphyllidae]
- Canadoceras, Spath 1922 [Pachydiscidae]
- Canadocystis [Comarocystitida]
- Canadospira [Rastelligeridae]
- Canadotis [Pterioida]
- Canalilatus [Zhanatellidae]
- Canalipora [Cyclostomata]
- Canaliscala, Cossmann 1888 [Cerithideidae]
- Canavarella [Graphoceratidae]
- Canavaria, Gemmellaro 1886 [Hildoceratidae]
- Canavarites [Arietitidae]
- Canavirilia [Leiorhynchidae]
- Cancellaria, Lamarck 1799 [Cancellariidae]
- Cancellaria (Bivetiella), Wenz 1943 [Cancellariidae]
- Cancellaria (Pyruclia), Olsson 1932 [Cancellariidae]
- Cancellariella [Neogastropoda]
- Cancellina [Neoschwagerinidae]
- Cancelloceras, Ruzhencev and Bogoslovskaya 1969 [Gastrioceratidae]
- Cancellothyris [Cancellothyrididae]
- Cancelrana, Palmer 1937 [Neogastropoda]
- Cancilla, Swainson 1840 [Mitridae]
- Cancrinella [Linoproductidae]
- Cancrinos, Munster 1839 [Cancrinidae]
- Cancris, Monfort 1808 [Bagginidae]
- Cancrisiella [Foraminifera]
- Cancrixantho, Van Straelen 1934 [Carcineretidae]
- Canda, Lamouroux 1816 [Candidae]
- Candeina [Foraminifera]
- Candinia [Sacoglossa]
- Candispirifer [Reticulariidae]
- Candorbulina [Foraminifera]
- Canepina, Conti and Fischer 1981 [Gastropoda]
- Canesium [Nassellaria]
- Caninella, Gorskiy 1938 [Bothrophyllidae]
- Caninia, Michelin 1840 [Cyathopsidae]
- Caninophyllum, Lewis 1929 [Bothrophyllidae]
- Caninostrotion, Easton 1943 [Aulophyllidae]
- Canistrocrinus, Wachsmuth and Springer 1885 [Monobathrida]
- Canistrumella, Rigby 1986 [Eiffeliidae]
- Cannapora, Hall 1852 [Syringoporidae]
- Cannartidium [Spumellaria]
- Cannartiscus [Spumellaria]
- Cannartus [Spumellaria]
- Canningella, Legg 1976 [Pliomeridae]
- Canningius [Coelacanthiformes]
- Cannobotrys, Haeckel 1881 [Cannobotryidae]
- Cannostomites [Coronatida]
- Canobius, Traquair 1881 [Palaeoniscidae]
- Cantabricanites, Weyer 1965 [Prolecanitidae]
- Cantabriella [Strophopleuridae]
- Cantharidella, Pilsbry 1889 [Trochidae]
- Cantharidus, Monfort 1810 [Trochidae]
- Cantharidus (Beraua), Beets 1941 [Trochidae]
- Cantharocrinus, Breimer 1962 [Monobathrida]
- Cantharulus, Meek 1876 [Neogastropoda]
- Cantharus, Röding 1798 [Buccinidae]
- Canthylotreta, Rowell 1966 [Acrotretidae]
- Cantrainea [Turbinidae]
- Cantrillia, Smith 1930 [Tryplasmatidae]
- Canupora [Cheilostomata]
- Canutrypa [Cystoporata]
- Canutus, Pessagno and Whalen 1982 [Bagotidae]
- Capedopecten [Pterioida]
- Capellineosuchus, Romer 1966 [Metriorhynchidae]
- Capelliniella, Strand 1928 [Pentameridae]
- Capillapora [Trepostomida]
- Capillicyathus [Cribricyathea]
- Capillimya [Laternulidae]
- Capillirostra [Norellidae]
- Capillispirifer [Choristitidae]
- Capillithyris [Capillithyrididae]
- Capistrocardia [Myoida]
- Caplinoplia [Anopliidae]
- Capnodoce, De Wever 1979 [Pantanelliidae]
- Capnophyllum, Sutherland 1965 [Eridophyllidae]
- Capnuchosphaera, De Wever 1979 [Capnuchosphaeridae]
- Caprabolbina [Palaeocopida]
- Capricornognathus [Conodontophorida]
- Caprina, d'Orbigny 1822 [Caprinidae]
- Caprinella [Hippuritida]
- Caprinula, Orbigny 1847 [Caprinulidae]
- Caprinuloidea, Palmer 1928 [Caprinuloideidae]
- Capriocornites [Nautilida]
- Caproberyx, Regan 1911 [Beryciformes]
- Capros, Lacépède 1802 [Caproidae]
- Caprotina, Orbigny 1842 [Caprinulidae]
- Capsacythere [Podocopida]
- Capsella [Cardiida]
- Capsicocrinus, Delogu and Nicosia 1986 [Cyrtocrinida]
- Capsospongia, Rigby 1986 [Anthaspidellidae]
- Capsulocyathida, order, Zhuravleva 1964 [Regulares]
- Capsulocyathus [Capsulocyathida]
- Capulacmaea, Sars 1859 [Velutinidae]
- Capulus, Monfort 1810 [Capulidae]
- Carabocrinus, Billings 1857 [Carabocrinidae]
- Carangodes, Heckel 1856 [Carangodidae]
- Carantophyllum [Scleractinia]
- Caranx, Lacépède 1802 [Carangidae]
- Carapezzia [Peregrinellidae]
- Carapus, Rafinesque 1810 [Ophidiiformes]
- Carbactinoceras, Schindewolf 1935 [Carbactinoceratidae]
- Carbocyrtina [Davidsoninidae]
- Carbonarca, Meek 1866 [Parallelodontidae]
- Carbonella [Foraminifera]
- Carboninia [Heterostrophia]
- Carbonocoryphe, R. Richter and E. Richter 1950 [Proetidae]
- Carbonoproetus, J. Gandl 1987 [Proetidae]
- Carboprimita [Palaeocopida]
- Carcharhinus, de Blainville 1816 [Carcharhinidae]
- Carchariolamna, Hora 1939 [Lamniformes]
- Carcharocles, Jordan 1923 [Otodontidae]
- Carcharodon, Smith 1838 [Lamnidae]
- Carcicocaenia, Alloiteau 1954 [Scleractinia]
- Carcinocarcinus [Decapoda]
- Carcinocrinus, Laudon 1941 [Cladida]
- Carcinoplacoides [Catoptridae]
- Carcinoplax, H. Milne-Edwards 1852 [Goneplacidae]
- Carcinosoma [Carcinosomatidae]
- Carcinus, Leach 1814 [Carcinidae]
- Cardabia [Holasteroida]
- Cardiaphyllum [Anthozoa]
- Cardiarachnidium [Ctenostomata]
- Cardiaster, Forbes 1850 [Holasteridae]
- Cardiastraea, Beauvais 1978 [Distichophylliidae]
- Cardiella, Pavlov 1967 [Marathonitidae]
- Cardilia, Deshayes 1835 [Cardiliidae]
- Cardilona [Cardiida]
- Cardinalia [Archaeogastropoda]
- Cardinia, Edwards 1837 [Cardiniidae]
- Cardiniferella [Palaeocopida]
- Cardinioides [Trigonodidae]
- Cardiniopsis [Cardiida]
- Cardiocardita, Anton 1839 [Carditidae]
- Cardioceras [Cardioceratidae]
- Cardiocystites, Barrande 1887 [Eocrinoidea]
- Cardiodictyon [Onychophora]
- Cardioecia [Cyclostomata]
- Cardiograptus [Graptoloidea]
- Cardiolampas [Disasteridae]
- Cardiolaria, Munier-Chalmas 1876 [Cardiolariidae]
- Cardiolita, Strand 1933 [Arcida]
- Cardiolopsis [Cardiolidae]
- Cardiomantea [Cardiida]
- Cardiomya, A. Adams 1864 [Cuspidariidae]
- Cardiopelta [Collyritidae]
- Cardiophyllum [Cribricyathea]
- Cardiotaxis [Holasteridae]
- Cardiothyris [Athyrididae]
- Cardirhynchus, Schluter 1862 [Decapoda]
- Cardisoma, Latreille 1825 [Gecarcinidae]
- Cardita, Bruguière 1792 [Carditidae]
- Cardita (Strophocardia), Olsson 1961 [Carditidae]
- Carditamera, Conrad 1838 [Carditidae]
- Carditella, Smith 1881 [Carditidae]
- Carditellopsis [Cardiida]
- Cardites, Link 1807 [Carditidae]
- Carditomantea [Cardiida]
- Carditopsis [Cardiida]
- Cardium, Linnaeus 1758 [Cardiidae]
- Cardium (Pachycardium) (Conrad 1869) [Cardiidae]
- Cardobairdia [Saipanettidae]
- Careliopsis, Mörch 1875 [Pyramidellidae]
- Caretta, Rafinesque 1814 [Cheloniidae]
- Caribbaster [Spatangoida]
- Caribbella [Podocopida]
- Caribeanella [Foraminifera]
- Caribiella [Neogastropoda]
- Caricella, Conrad 1835 [Volutidae]
- Carinacca, Marwick 1924 [Naticidae]
- Carinacyathus [Ajacicyathida]
- Carinagypa, Johnson and Ludvigsen 1973 [Gypidulidae]
- Carinaria, Lamarck 1801 [Carinariidae]
- Carinastarte [Cardiida]
- Carinatina [Carinatinidae]
- Carinatinella [Atrypidae]
- Carinator [Archaeogastropoda]
- Carinatothyris [Terebratulida]
- Carinatrypa [Carinatinidae]
- Carinella [Conodontophorida]
- Carinifer [Cyclostomata]
- Cariniferella [Dalmanellidae]
- Carinitheca [Orthothecida]
- Carinobolbina [Palaeocopida]
- Carinoceras, Ljaschenko 1957 [Gephuroceratidae]
- Carinoclymenia, Bogoslovsky 1965 [Carinoclymeniidae]
- Carinoconus [Foraminifera]
- Carinodictya [Rhinidictyidae]
- Carinokloedenia [Palaeocopida]
- Carinomphalus, Yu 1974 [Gastropoda]
- Carinonychia [Pterioida]
- Carinophylloporina [Fenestrata]
- Carinotropsis [Neogastropoda]
- Carinthiaphyllum, Heritsch 1936 [Geyerophyllidae]
- Caritodens [Pterineidae]
- Carixia [Cornuspiridae]
- Carlinastraea, Merriam 1976 [Spongophyllidae]
- Carlinia [Productidae]
- Carlloceras, Flower and Caster 1935 [Centroceratidae]
- Carlopsocrinus, Wright 1933 [Cladida]
- Carmon, Barrande 1872 [Trilobita]
- Carnarvonia [Ostracoda]
- Carnegiea, Girty 1913 [Chaetetidae]
- Carneithyris [Gibbithyrididae]
- Carneyella, Forste 1916 [Hemicystitidae]
- Carniaphyllum, Heritsch 1936 [Geyerophyllidae]
- Carnicoleus [Lepidocoleomorpha]
- Carnidia [Bivalvia]
- Carnites, E. v. Mojsisovics 1873 [Carnitidae]
- Carnivora, order, Bowditch 1821 [Mammalia]
- Carolia, Cantraine 1838 [Anomiidae]
- Carolia (Parinomya), Olsson 1928 [Anomiidae]
- Carolicrinus, Waagen and Jahn 1899 [Monobathrida]
- Carolinites, Kobayashi 1940 [Telephinidae]
- Carolirhynchia [Aseptorhynchiidae]
- Carotites [Discosorida]
- Carpathichthys, Jerzmanska 1979 [Osmeriformes]
- Carpenteria [Homotrematidae]
- Carpenteroblastus, Rowley 1901 [Spiraculata]
- Carpicyathus [Ajacicyathida]
- Carpilius, Desmarest 1823 [Carpiliidae]
- Carpilodes [Decapoda]
- Carpinaria [Spinocyrtiidae]
- Carpocanarium [Nassellaria]
- Carpocanistrum, Haeckel 1887 [Carpocaniidae]
- Carpocanium, Ehrenberg 1847 [Carpocaniidae]
- Carpocanopsis, Riedel and Sanfilippo 1971 [Carpocaniidae]
- Carpocrinus, Muller 1840 [Carpocrinidae]
- Carpocystites [Diploporita]
- Carpopenaeus, Glaessner 1946 [Carpopenaeidae]
- Carpospongia, Rauff 1894 [Astylospongiidae]
- Carrickia, Tripp 1965 [Telephinidae]
- Carringtonia [Productellidae]
- Carruthersella, Garwood 1913 [Aulophyllidae]
- Carsosaurus, Kornhuber 1893 [Aigialosauridae]
- Carsothrissops, D'Erasmo 1946 [Elopiformes]
- Carstenia [Cephalopoda]
- Carterella, Zittel 1878 [Demospongea]
- Carteridina [Athyrididae]
- Carterina [Foraminifera]
- Carterochaena [Myoida]
- Carthaginites [Turrilitidae]
- Carubacgutes [Sachitida]
- Carubaknightina [Palaeocopida]
- Caruichthys, Broom 1913 [Palaeonisciformes]
- Carybdeida, order [Cubozoa]
- Carydiopora [Cheilostomata]
- Carydium, Beushausen 1895 [Carydiidae]
- Caryoblastus, A. Breimer et al. 1968 [Fissiculata]
- Caryocaris, Salter 1863 [Caryocarididae]
- Caryocorbula (Gardner 1926) [Corbulidae]
- Caryocrinites, Say 1825 [Caryocrinitidae]
- Caryocystites, Buch 1844 [Caryocystitidae]
- Caryogyps, Johnson et al. 1976 [Gypidulidae]
- Caryomanon [Demospongea]
- Caryophyllia, Lamarck 1801 [Caryophylliidae]
- Caryorhynchus [Leiorhynchidae]
- Caryosphaera [Spumellaria]
- Caryospongia, Rauff 1894 [Astylospongiidae]
- Caseispongia [Hexactinosa]
- Caseyella [Neogastropoda]
- Casierius, Estes 1969 [Anguilliformes]
- Casieroides, Taverne 1975 [Salmoniformes]
- Casimiria, Cossmann 1899 [Trypanaxidae]
- Casmaria, H. Adams and A. Adams 1853 [Cassidae]
- Caspiaza [Spumellaria]
- Caspiella [Foraminifera]
- Caspimactra [Cardiida]
- Casquella [Obolidae]
- Cassianastraea, Volz 1897 [Lemniscateridae]
- Cassianastraea, Volz 1897 [Pachythecalidae]
- Cassianastraea [Turbinidae]
- Cassianaxis [Heterostrophia]
- Cassianella, Beyrich 1862 [Cassianellidae]
- Cassianilda [Heterostrophia]
- Cassianocirrus, Bandel 1993 [Pleurotomariida]
- Cassianopora [Fistuliporidae]
- Cassianospira [Neoretziidae]
- Cassianostroma, Flügel 1960 [Halichondrida]
- Cassianothalamia, Reitner 1987 [Cassianothalamiidae]
- Cassidaria, Lamarck 1816 [Cassidae]
- Cassidelina [Foraminifera]
- Cassidella [Foraminifera]
- Cassideus, Pessagno 1969 [Cuniculiformiidae]
- Cassidiceps, Gagnier and Wilson 1996 [Climatiiformes]
- Cassidirostrum [Hebetoechiidae]
- Cassidulina, d'Orbigny 1826 [Cassidulinidae]
- Cassidulinella [Foraminifera]
- Cassidulinita [Foraminifera]
- Cassidulinoides, Cushman 1927 [Islandiellidae]
- Cassigerinella, Pokorny 1955 [Globigerinidae]
- Cassigerinelloita, Stolk 1956 [Globigerinidae]
- Cassinoceras, Ulrich and Foerste 1936 [Piloceratidae]
- Cassiope, Coquand 1865 [Cassiopidae]
- Cassipelia [Archaeogastropoda]
- Cassis, Scopoli 1777 [Cassidae]
- Cassis (Sassia), Bellardi 1872 [Cassidae]
- Cassubia, Lendzion 1977 [Anomalocarididae]
- Castanopora [Cheilostomata]
- Castellaroina [Leptostrophiidae]
- Castericystis, Ubaghs and Robison 1985 [Soluta]
- Casteroceras, Flower 1936 [Rutoceratidae]
- Casterocythere [Podocopida]
- Casterolimulus [Xiphosurida]
- Casteropora [Ctenostomata]
- Castrum [Pseudodictyomitridae]
- Catacephalus [Stringocephalidae]
- Cataceramus, Cox 1969 [Inoceramidae]
- Catacoeloceras [Dactylioceratidae]
- Catacoraites [Metacopida]
- Catactocrinus, Goldring 1923 [Glossocrinidae]
- Catactotoechus, Hill 1954 [Laccophyllidae]
- Catadoxides, Matthew 1899 [Trilobita]
- Catamarcaia [Arcida]
- Catapsydrax [Foraminifera]
- Cataraquicrinus, Kolata 1983 [Crinoidea]
- Catasigaloceras [Kosmoceratidae]
- Catasolenopleura, Qiu 1983 [Ptychopariida]
- Catastroboceras [Nautilida]
- Catatonocrinus, Brett 1981 [Crinoidea]
- Catatrypa [Atrypidae]
- Catazyga, Hall and Clarke 1893 [Anazygidae]
- Catella, Healey 1908 [Parallelodontidae]
- Catenariopsis [Cheilostomata]
- Catenicella, de Blainville 1830 [Catenicellidae]
- Catenipora, Lamarck 1816 [Halysitidae]
- Catenoscala, Dall 1908 [Epitoniidae]
- Catenotoma [Neogastropoda]
- Cathaysia [Productellidae]
- Cathetocrinus, Knapp 1969 [Cladida]
- Catillicephala, Raymond 1937 [Catillicephalidae]
- Catillocrinus, Shumard 1886 [Crinoidea]
- Catilon [Neogastropoda]
- Catinula [Gryphaeidae]
- Cativella, Coryell and Fields 1937 [Podocopida]
- Catopygus [Nucleolitidae]
- Catoraphinoceras, Ulrich and Foerste 1936 [Protocycloceratidae]
- Catulloceras [Hildoceratidae]
- Catuniella, Egorova 1956 [Conokephalinidae]
- Catyrephoceras, Foerste 1926 [Lechritrochoceratidae]
- Caucacrocrinus, Moore and Strimple 1969 [Monobathrida]
- Caucasella, Hacobjan 1972 [Turritellidae]
- Caucasella, Moisseiev 1934 [Erymnariidae]
- Caucasicus [Spumellaria]
- Caucasina [Rotaliina]
- Caucasiproductus [Sentosiidae]
- Caucasites, A. A. Shevyrev 1968 [Gymnitidae]
- Caudites, Coryell and Fields 1937 [Hemicytheridae]
- Caudriella [Foraminifera]
- Caulaspina, Rozova 1963 [Lonchocephalidae]
- Caulaspis, Rozova 1960 [Asaphida]
- Caulastrea (Dana 1846) [Merulinidae]
- Caulophacus [Lyssacinosida]
- Caumontisphinctes [Parkinsoniidae]
- Cautotriphora, Laws 1940 [Triphoridae]
- Cava [Cyclostomata]
- Cavanechinus [Echinocystitoida]
- Cavaria [Cyclostomata]
- Cavarinella [Cyclostomata]
- Cavaspongia, Pessagno 1973 [Cavaspongiidae]
- Cavatisinurostrum [Pugnacidae]
- Caveacus [Problematica]
- Cavellina [Cavellinidae]
- Caveola, L. W. Stephenson 1941 [Cancellariidae]
- Cavernisa, Radoman 1978 [Hydrobiidae]
- Cavernolites [Hyolithida]
- Cavhithis [Palaeocopida]
- Cavilabium, Cossmann 1888 [Iravadiidae]
- Cavilasma [Anthozoa]
- Cavilinga, Chavan 1937 [Lucinidae]
- Cavilucina, Fischer 1887 [Lucinidae]
- Cavispongia, Quenstedt 1877 [Lychniscosa]
- Caviumbonia, Youlou 1978 [Neotaenioglossa]
- Cavolina (Avilgaard 1791) [Cavoliniidae]
- Cavopleura [Palaeocopida]
- Cavusgnathus, Harris and Hollingsworth 1933 [Polygnathidae]
- Caytonidea [Podocopida]
- Cayutoceras, Flower 1939 [Pseudorthoceratidae]
- Caznaia, Shergold 1975 [Asaphida]
- Ceata [Cyclostomata]
- Ceciliaphyllum [Anthozoa]
- Cecrops, Pessagno 1977 [Pantanelliidae]
- Cedaraspis, Ivshin 1960 [Ptychopariida]
- Cedarellus, Lazerenko 1966 [Ptychopariida]
- Cedaria, Walcott 1924 [Cedariidae]
- Cedarina, Lochman 1940 [Cedariidae]
- Cedarvilleoceras [Orthocerida]
- Cederstroemia, Siverson 1995 [Chondrichthyes]
- Cedocamia [Ostracoda]
- Cedulia [Chonetidae]
- Ceidmonea [Cyclostomata]
- Cekovia, Snajdr 1956 [Styginidae]
- Celaeceras, J. J. Sepkoski 2002 [Auguritidae]
- Celdobolus [Siphonotretidae]
- Celechopora, Pradacova 1938 [Pachyporidae]
- Celechovites [Ostracoda]
- Celidocrania, Zhu and Xue 1985 [Craniidae]
- Cellana, Adams 1869 [Patellidae]
- Cellaria, Ellis and Solander 1786 [Cellariidae]
- Cellarinella [Sclerodomidae]
- Cellarinidra [Cheilostomata]
- Cellepora, Linnaeus 1767 [Celleporidae]
- Celleporaria, Lamouroux 1821 [Lepraliellidae]
- Celleporella [Hippothoidae]
- Celleporina, Gray 1848 [Celleporidae]
- Cellicyathus [Archaeocyathida]
- Cellonina [Psammosphaeridae]
- Cellulipora [Cyclostomata]
- Celmus, Angelin 1854 [Raymondinidae]
- Celsifornix [Strophopleuridae]
- Celtanoplia [Anopliidae]
- Celtencrinurus, Evitt and Tripp 1974 [Phacopida]
- Cementula [Serpulimorpha]
- Cenellipsis [Spumellaria]
- Cenoceras, Hyatt 1884 [Cenoceratidae]
- Cenocrinus, Thomson 1864 [Isselicrinidae]
- Cenodiscaella [Spumellaria]
- Cenodiscus [Spumellaria]
- Cenolarcopyle [Spumellaria]
- Cenomanella, Cossmann 1918 [Turbinidae]
- Cenomanina [Agatheliidae]
- Cenomanocarcinus, V. Van Straelen 1936 [Cenomanocarcinidae]
- Cenosphaera, Ehrenberg 1854 [Actinommidae]
- Centauropyge, Haas 1968 [Acastidae]
- Centracanthus, Rafinesque 1810 [Centracanthidae]
- Centrifuga [Neogastropoda]
- Centriocrinus, Bather 1899 [Monobathrida]
- Centristela, Tsyganko 1967 [Centristelidae]
- Centroberyx, Gill 1862 [Berycidae]
- Centrobotrys, Petrushevskaya 1965 [Cannobotryidae]
- Centrocardita, Sacco 1899 [Carditidae]
- Centroceras, Hyatt 1884 [Centroceratidae]
- Centrocyrtoceras, Foerste 1933 [Barrandoceratidae]
- Centrocythere [Podocopida]
- Centrolitoceras, Flower 1945 [Rutoceratidae]
- Centronea [Cyclostomata]
- Centronella, Billings 1859 [Centronellidae]
- Centronelloidea [Dielasmatidae]
- Centroonoceras, Kobayashi 1934 [Sactorthoceratidae]
- Centrophoroides, Davis 1887 [Squalidae]
- Centrophorus, Müller and Henle 1837 [Centrophoridae]
- Centropleura, Angelin 1854 [Centropleuridae]
- Centropomus, Lacépède 1802 [Centropomidae]
- Centropristis, Cuvier 1829 [Serranidae]
- Centropterus, Costa 1856 [Squaliformes]
- Centropygus [Cassiduloida]
- Centrorhynchus [Trigonirhynchiidae]
- Centrorizoceras, Foerste 1930 [Oncoceratidae]
- Centrosqualus, Signeux 1950 [Squaliformes]
- Centrostephanus [Diadematidae]
- Centrotarphyceras, Ulrich and Foerste 1936 [Tarphyceratidae]
- Ceotinella, Pantic 1975 [Ceotinellidae]
- Cepatia, Gray 1842 [Naticidae]
- Cephalaspida, order (Fischer 1883) [Gastropoda]
- Cephalaspidea, order, Fischer 1883 [Gastropoda]
- Cephalaspidiformes, order [Cephalaspidomorphi]
- Cephalites [Lychniscosa]
- Cephalochordata, class, Haeckel 1866 [Chordata]
- Cephalodiscida, order [Pterobranchia]
- Cephalodiscus [Cephalodiscida]
- Cephalograptus [Graptoloidea]
- Cephalopoda, class, Cuvier 1797 [Mollusca]
- Cephalopyge, Geyer 1988 [Weymouthiidae]
- Cephalopyramis [Nassellaria]
- Cephaloraphidites, Schrammen 1899 [Cephaloraphiditidae]
- Cephaloxeniformes, order [Osteichthyes]
- Cepola, Linnaeus 1764 [Cepolidae]
- Cerabonusoides [Radiodonta]
- Ceragnostus [Agnostida]
- Ceramella [Cystoporata]
- Ceramograptus [Graptolithina]
- Ceramophylla [Cystoporata]
- Ceramopora, Hall 1851 [Ceramoporidae]
- Ceramoporella, Ulrich 1882 [Ceramoporidae]
- Ceramurus, Egerton 1845 [Pholidophoridae]
- Ceraostroma [Axinellida]
- Cerarchocyrtium, Deflandre 1973 [Archocyrtiidae]
- Cerasmocrinus, Strimple and Levorson 1973 [Monobathrida]
- Cerastoderma, Mörch 1853 [Cardiidae]
- Ceratammina [Psammosphaeridae]
- Ceratia, H. Adams and A. Adams 1850 [Iravadiidae]
- Ceratiocaris, McCoy 1849 [Archaeostraca]
- Ceratites, de Haan 1825 [Ceratitidae]
- Ceratitida, order, A. Hyatt 1884 [Cephalopoda]
- Ceratobeloceras, House and Kirchgasser 1985 [Beloceratidae]
- Ceratoblastus, J. Wanner 1940 [Fissiculata]
- Ceratobolbina [Palaeocopida]
- Ceratobulimina, Toula 1915 [Cassidulinidae]
- Ceratocancris [Foraminifera]
- Ceratocara, Ramsköld 1991 [Odontopleuridae]
- Ceratocephala, Warder 1838 [Odontopleuridae]
- Ceratocoenia, Tomes 1884 [Amphiastreidae]
- Ceratoconcha, Kramberger-Gorjanovic 1889 [Pyrgomatidae]
- Ceratocratia [Podocopida]
- Ceratocrinus, Wanner 1937 [Cladida]
- Ceratocypris [Ostracoda]
- Ceratocystis [Cornuta]
- Ceratodictya [Reticulosa]
- Ceratoichthys, Blot 1969 [Carangidae]
- Ceratoikiscum, Deflandre 1953 [Ceratoikiscidae]
- Ceratolamarckina [Foraminifera]
- Ceratoleperditia, Harris 1960 [Leperditicopida]
- Ceratolithus, Lu 1959 [Asaphida]
- Ceratomya, Sandberger 1864 [Ceratomyidae]
- Ceratomyopsis, Cossmann 1915 [Ceratomyopsidae]
- Ceratonurus, Prantl and Pribyl 1949 [Odontopleuridae]
- Ceratophyllia, Fritsch 1878 [Faviidae]
- Ceratophyllum, Gürich 1896 [Disphyllidae]
- Ceratoporella, Hickson 1911 [Ceratoporellidae]
- Ceratoproetus, Poulson 1937 [Proetida]
- Ceratopsis [Palaeocopida]
- Ceratopyge, Hawle and Corda 1847 [Ceratopygidae]
- Ceratoscopelus, Günther 1864 [Myctophidae]
- Ceratostreon, Bayle 1878 [Gryphaeidae]
- Ceratotheca, Novak 1886 [Ceratothecidae]
- Ceratothecia, Turnsek 1972 [Montlivaltiidae]
- Ceratotrochus, Milne-Edwards and Haime 1848 [Caryophylliidae]
- Ceratreta, Bell 1941 [Ceratretidae]
- Ceraurinus, Barton 1913 [Cheiruridae]
- Cerauroides, Prantl and Pribyl 1947 [Cheiruridae]
- Cerauromeros, Pribyl and Vanek 1985 [Cheiruridae]
- Cerauropeltis, Pribyl and Vanek 1985 [Phacopida]
- Ceraurus, Green 1832 [Cheiruridae]
- Cerberatrypa [Septatrypidae]
- Cercidocrinus, Kirk 1938 [Cladida]
- Cercomya, Agassiz 1843 [Laternulidae]
- Cereiophyllia (Barta-Calmus 1973) [Faviidae]
- Ceresiosaurus, Peyer 1931 [Nothosauridae]
- Ceriaster, Lindström 1883 [Stauriidae]
- Ceriocava, d'Orbigny 1849 [Cavidae]
- Ceriocysta, Zhavoronkova 1976 [Cystiphyllidae]
- Ceriodictyon [Lychniscosa]
- Cerioelasma [Anthozoa]
- Cerioheterastraea, Cuif 1976 [Stylophyllidae]
- Ceriopora, Goldfuss 1826 [Cerioporidae]
- Cerioporella [Cyclostomata]
- Ceriphyllum [Anthozoa]
- Ceristella [Anthozoa]
- Ceritella, Morris and Lycett 1851 [Cephalaspida]
- Cerithidea, Swainson 1840 [Potamididae]
- Cerithideops, Pilsbry and Harbison 1933 [Potamididae]
- Cerithideopsis, Thiele 1929 [Potamididae]
- Cerithidium, Monterosato 1884 [Cerithiidae]
- Cerithiella, Verrill 1882 [Triforidae]
- Cerithinella, Gemmellaro 1878 [Cryptaulacidae]
- Cerithioclava, Olssen and Harbison 1953 [Cerithiidae]
- Cerithioderma, Conrad 1860 [Trichotropidae]
- Cerithiomorpha, Akopyan 1976 [Sorbeoconcha]
- Cerithiopsidella, Bartsch 1911 [Cerithiopsidae]
- Cerithiopsis, Hanley 1849 [Cerithiopsidae]
- Cerithiscala, de Boury 1887 [Epitoniidae]
- Cerithium, Bruguière 1789 [Cerithiidae]
- Cerithopsina, Bartsch 1911 [Cerithiopsidae]
- Cermataspis, Opik 1967 [Acrocephalitidae]
- Cermatops, Shergold 1980 [Trilobita]
- Cerninella [Palaeocopida]
- Cerobertina [Foraminifera]
- Cerobertinella [Foraminifera]
- Ceromyella [Pholadomyida]
- Ceroniola [Cardiida]
- Ceronocare, Shergold 1975 [Asaphida]
- Cershiites [Palaeocopida]
- Cerullia [Cardiida]
- Cessipylorum [Spumellaria]
- Cestites [Problematica]
- Cestobrissus [Spatangoida]
- Cestocrinus, Kirk 1940 [Cladida]
- Cetorhinus, de Blainville 1816 [Cetorhinidae]
- Chabactoceras [Ellesmerocerida]
- Chablaisia [Foraminifera]
- Chaceia [Myoida]
- Chacomurus, Branisa and Vanek 1973 [Phacopida]
- Chadwickoceras, Foerste 1930 [Acleistoceratidae]
- Chaenocardia, Meek 1869 [Chaenocardiidae]
- Chaenogaleus, Gill 1861 [Hemigaleidae]
- Chaetetella, Sokolov 1962 [Chaetetidae]
- Chaetetes, Fischer von Waldheim 1829 [Chaetetidae]
- Chaetetipora, Struve 1898 [Chaetetidae]
- Chaetetopsis [Tabulospongida]
- Chaetognatha, phylum, Leuckart 1854 [Scalidophora]
- Chaetopleura, Shuttleworth 1853 [Chaetopleuridae]
- Chaetosalpinx [Serpulimorpha]
- Chaeturichthys, Richardson 1844 [Perciformes]
- Chaganella [Hesperomenidae]
- Chagrinia, Schaeffer 1962 [Actinistia]
- Chainodictyon [Chainodictyonidae]
- Chaivella [Mitrata]
- Chakassicyathus [Ajacicyathida]
- Chakasskia, Poletayeva 1936 [Trilobita]
- Chalalabelus [Belemnitida]
- Chalcidophyllum, Pedder 1965 [Disphyllidae]
- Chalfontia, Shergold 1982 [Dokimocephalidae]
- Chalilovella [Foraminifera]
- Chalimochonetes [Chonetidae]
- Chalmasia [Pterioida]
- Chamaesipho [Cirripedia]
- Chamelea, Mörch 1853 [Veneridae]
- Chametrachea [Cardiidae]
- Chamishaella [Paraparchitidae]
- Chamoussetia [Cardioceratidae]
- Championodictya [Cryptostomata]
- Champlainia, Howell 1937 [Ptychopariida]
- Champlainopora, Ross 1970 [Trepostomida]
- Chanasia [Oppeliidae]
- Chancelloria, Walcott 1920 [Chancelloriidae]
- Chancelloriida, order, Walcott 1920 [Coeloscleritophora]
- Chancia, Walcott 1924 [Alokistocaridae]
- Chanciaopsis, Sunbe 1994 [Alokistocaridae]
- Chanda, Hamilton 1822 [Perciformes]
- Changaspis, Lee 1961 [Oryctocephalidae]
- Changhsingoceras, Zhao and Liang 1965 [Cyclolobidae]
- Changia, Sun 1924 [Ptychaspididae]
- Changicyathus [Archaeocyathida]
- Changjianggouphyllum [Anthozoa]
- Changkiuoceras, Shimizu and Obata 1935 [Cephalopoda]
- Changninocrinus, Chen Yao and Yu 1985 [Crinoidea]
- Changqingia, Lu and Zhu 1983 [Ptychopariida]
- Changshabaella, Huo and Shu 1982 [Archaeocopida]
- Changshaispirifer [Adolfiidae]
- Changshania, Sun 1924 [Changshaniidae]
- Changshanocephalus, Sun 1935 [Ptychopariida]
- Changtangella [Ambocoeliidae]
- Changyangnia [Myodocopida]
- Changyangrhynchus [Wellerellidae]
- Chankacyathus [Archaeocyathida]
- Chanopsis, Casier 1961 [Gonorhynchiformes]
- Chanos, Lacépède 1803 [Chanidae]
- Chaoaspis, Chang 1966 [Redlichiidae]
- Chaohuceras, Qi 1980 [Endocerida]
- Chaohusaurus, Young and Dong 1972 [Grippiidae]
- Chaoiella [Productellidae]
- Chapadella [Meganterididae]
- Chaperia, Munier-Chalmas 1873 [Caprotinidae]
- Chaperia, Jullien 1881 [Chaperiidae]
- Chapmanicythereis [Podocopida]
- Chapmanina [Foraminifera]
- Chapmanites [Metacopida]
- Characodoma [Cheilostomata]
- Charactoceras, Foerste 1924 [Apsidoceratidae]
- Charactocerina, Foerste 1935 [Apsidoceratidae]
- Charactocrinus, Brett 1981 [Crinoidea]
- Charactophyllum, Simpson 1900 [Disphyllidae]
- Charadriiformes, order, Huxley 1867 [Aves]
- Charassocarcinus [Decapoda]
- Chardonius, Taverne 1975 [Salmoniformes]
- Charentia [Charentiidae]
- Charientocrinus, Goldring 1923 [Glossocrinidae]
- Chariocephalus, Hall 1863 [Elviniidae]
- Chariocrinus, Hess 1972 [Isocrinidae]
- Charionella [Meristellidae]
- Charionoides [Meristellidae]
- Charisphyllum [Anthozoa]
- Charitopsis, Gayet 1993 [Gonorhynchidae]
- Charitosomus, Marck 1885 [Gonorhynchidae]
- Charitoxotis [Palaeocopida]
- Charixa [Cyclostomata]
- Charleuxia, Heyler 1969 [Palaeonisciformes]
- Charltonina [Foraminifera]
- Charonia, Gistel 1848 [Ranellidae]
- Charonia (Sassia), Bellardi 1872 [Ranellidae]
- Chartecytis [Cyclostomata]
- Chartocardium [Cardiida]
- Charybdis, De Haan 1833 [Portunidae]
- Chascothyris [Stringocephalidae]
- Chasmataspidida, order, Caster and Brooks 1956 [Dekatriata]
- Chasmataspis [Chasmataspidida]
- Chasmatopora, Eichwald 1860 [Phylloporinidae]
- Chasmatoporina [Fenestrata]
- Chasmazoon [Cheilostomata]
- Chasmocarcinus, Rathbun 1898 [Chasmocarcinidae]
- Chasmops, McCoy 1846 [Pterygometopidae]
- Chasmotheca, Dall 1904 [Bursidae]
- Chathamithyris [Terebratellidae]
- Chatkalagnostus, Khairullina and Abdullaev 1970 [Agnostida]
- Chatsworthia [Isorophida]
- Chattertonia [Productellidae]
- Chatwinothyris [Gibbithyrididae]
- Chauffouraspis, Pillet 1973 [Proetida]
- Chauliodus, Schneider 1801 [Stomiidae]
- Chaulistomella [Plaesiomyidae]
- Chaunax, Lowe 1846 [Lophiiformes]
- Chaunograptus [Graptolithina]
- Chaunoproetus, Richter 1919 [Proetidae]
- Chauvelia [Cornuta]
- Chauvelicystis [Cornuta]
- Chauvetia, Monterosato 1884 [Neogastropoda]
- Chavanella [Cardiida]
- Chavsakia, Lavrusevich 1959 [Ketophyllidae]
- Chazydictya, Ross 1963 [Cryptostomata]
- Checontonomus [Myodocopida]
- Chedevillia, Cossmann 1906 [Rostellariidae]
- Cheethamia [Cheilostomata]
- Cheilea, Modeer 1793 [Hipponicidae]
- Cheilinus, Lacépède 1802 [Perciformes]
- Cheilocephalus, Berkey 1898 [Cheilocephalidae]
- Cheiloceras, Frech 1897 [Cheiloceratidae]
- Cheilohorneropsis [Cheilostomata]
- Cheilonella [Cheilostomata]
- Cheilopora [Cheilostomata]
- Cheiloporina, Canu and Bassler 1923 [Cheiloporinidae]
- Cheilosmilia, Koby 1888 [Amphiastreidae]
- Cheilospicata [Thecosomata]
- Cheilosporites, Wähner 1903 [Cheilosporitiidae]
- Cheilostomata, order, Busk 1859 [Gymnolaemata]
- Cheilotrypa, Ulrich 1884 [Fistuliporidae]
- Cheiopteria [Pterioida]
- Cheiracanthoides, Wells 1944 [Climatiiformes]
- Cheirocrinus, Eichwald 1856 [Glyptocystitida]
- Cheirodopsis, Traquair 1881 [Actinopterygii]
- Cheirothrix [Alepisauriformes]
- Cheirothyris [Zeilleriidae]
- Cheiruroides, Kobayashi 1935 [Oryctocephalidae]
- Cheirurus, Beyrich 1845 [Cheiruridae]
- Chejudocythere [Podocopida]
- Chekiangaspis, Lu 1961 [Olenidae]
- Chelediscus, Rushton 1966 [Agnostida]
- Chelidonocephalus, King 1937 [Proasaphiscidae]
- Chelidozoum [Cheilostomata]
- Chelmon, Cloquet 1817 [Chaetodontidae]
- Chelocrinus, Meyer 1837 [Encrinidae]
- Chelodes, Davidson and King 1874 [Mattheviidae]
- Chelonechinus [Urechinidae]
- Chelonia, Brongniart 1800 [Cheloniidae]
- Chelonibia, Leach 1817 [Chelonibiidae]
- Cheloniceras, Hyatt 1903 [Douvilleiceratidae]
- Cheloniellida, order, Broili 1932 [Merostomoidea]
- Cheloniellon [Cheloniellida]
- Chelotia, Bayle in Fischer 1885 [Pleurotomariidae]
- Chelsonella [Orthothecida]
- Cheltonia [Oxynoticeratidae]
- Chelyconus, Mörch 1852 [Conidae]
- Chelyophorus, Agassiz 1845 [Arthrothoraci]
- Chelyopsis, Smets 1887 [Cheloniidae]
- Chelyposuchus, Romer 1966 [Placodontia]
- Chemnitzia, d'Orbigny 1840 [Pyramidellidae]
- Chenella [Foraminifera]
- Chenendopora, Lamouroux 1821 [Chenendoporidae]
- Chengkouia, Lu and Chang 1974 [Corynexochida]
- Chenia [Foraminifera]
- Chensaurus, Mazin Suteethora et al. 1991 [Grippiidae]
- Cheopsia [Hemiasteridae]
- Cheramus [Decapoda]
- Cherkesovaena [Carinatinidae]
- Chernobaculites [Foraminifera]
- Chernyshinella [Foraminifera]
- Chernyshinellina [Foraminifera]
- Cherskiella [Palaeocopida]
- Cherubicornea [Machaerariidae]
- Chesathais [Neogastropoda]
- Chesterella [Palaeocopida]
- Chetaites [Cephalopoda]
- Chevalieria, Melnikova 1984 [Tropidastraeidae]
- Chevalierismilia [Parasmiliidae]
- Chevallieria, Cossmann 1888 [Iravadiidae]
- Chevroleperditia, Swartz 1949 [Leperditicopida]
- Chia, Lin 1958 [Syringoporidae]
- Chiapasella, Müllerried 1931 [Radiolitidae]
- Chiarumanipyge, Branisa and Vanek 1973 [Phacopida]
- Chiastoclonella [Demospongea]
- Chiastodus, Trautschold 1879 [Eugeneodontiformes]
- Chiastolus [Acantharia]
- Chibapsetta, Sakamoto and Uyeno 1988 [Pleuronectiformes]
- Chicagooceras, Foerste and Savage 1927 [Orthocerida]
- Chichia, Liu and Wang 1978 [Palaeonisciformes]
- Chicoreus, Monfort 1810 [Muricidae]
- Chidleyenoceras, Shimizu and Obata 1935 [Apsidoceratidae]
- Chielasma, Minato and Kato 1965 [Waagenophyllidae]
- Chienaspis, Suvorova 1964 [Corynexochida]
- Chihlioceras, Grabau 1922 [Chihlioceratidae]
- Chihsiaphyllum, Minato and Kato 1965 [Waagenophyllidae]
- Chiiengphoherus [Decapoda]
- Chilara, Jordan and Evermann 1896 [Ophidiiformes]
- Chile [Chileidae]
- Chileida, order, Popov and Tikhonov 1990 [Chileata]
- Chileutomia, Tate and Cossmann 1898 [Eulimidae]
- Chilianshania [Monticuliferidae]
- Chilidiopsis [Chilidiopsidae]
- Chilidorthis [Bohemiellidae]
- Chilobolbina, Ulrich and Bassler 1923 [Palaeocopida]
- Chilocyclus, Bronn and Roemer 1851 [Naticidae]
- Chilodonta, Etallon 1859 [Chilodontidae]
- Chilodontoidea, Hudleston 1896 [Chilodontidae]
- Chiloguembelina [Chiloguembelinidae]
- Chiloguembelitria [Foraminifera]
- Chilometopus, Rusconi 1952 [Corynexochida]
- Chilomycterus, Bribon 1846 [Diodontidae]
- Chilonorria, Rusconi 1952 [Corynexochida]
- Chilopora [Cyclostomata]
- Chiloscyllium, Müller and Henle 1837 [Hemiscylliidae]
- Chilostomella [Chilostomellidae]
- Chilostomelloides [Foraminifera]
- Chilostomina [Foraminifera]
- Chimaeriformes, order, Obruchev 1953 [Chondrichthyes]
- Chimaeropsis, Zittel 1887 [Chimaeropsidae]
- Chimaerothyris [Adolfiidae]
- Chimela, Casey 1952 [Veneridae]
- Chinacrinus, Lane and Waters 1997 [Monobathrida]
- Chinensis [Trilobita]
- Chinianocarpos [Mitrata]
- Chion [Cardiida]
- Chione, von Mühlfield 1811 [Veneridae]
- Chionelasmus, Pilsbry 1911 [Chionolasmatidae]
- Chionella, Cossmann 1886 [Veneridae]
- Chioneryx, Iredale 1924 [Veneridae]
- Chionista, Keen 1958 [Veneridae]
- Chionopsis, Olsson 1932 [Veneridae]
- Chiozoon, Lane 1972 [Cheiruridae]
- Chiralithes [Neogastropoda]
- Chirocentrites [Cladocyclidae]
- Chirocentrus, Cuvier 1817 [Chirocentridae]
- Chirocrinus, Angelin 1878 [Crinoidea]
- Chirodella [Conodontophorida]
- Chirodipterus, Gross 1933 [Chirodipteridae]
- Chirognathus [Conodonta]
- Chirona, Gray 1835 [Archaeobalanidae]
- Chironiptrum [Palaeocopida]
- Chiropinna, Moore 1962 [Crinoidea]
- Chirospongia [Hexactinellida]
- Chirostoma, Swainson 1839 [Atheriniformes]
- Chirothrix, Zittel 1888 [Actinopterygii]
- Chisiloceras [Endocerida]
- Chisma [Cyclostomata]
- Chitinodendron, Eisenack 1938 [Lagynidae]
- Chitinoidella [Calpionellida]
- Chitinolagena [Allogromiidae]
- Chitinoteuthis [Aulacocerida]
- Chitonastrum, Haeckel 1881 [Spongodiscidae]
- Chitonotus, Lockington 1881 [Scorpaeniformes]
- Chitralina [Foraminifera]
- Chittidilla, King 1941 [Agraulidae]
- Chladocrinus, Agassiz 1836 [Isocrinidae]
- Chlamydophyllum, Pocta 1902 [Kodonophyllidae]
- Chlamydoselachus, Garman 1884 [Notidanidae]
- Chlamys, Röding 1798 [Pectinidae]
- Chlamys (Placopecten), Verrill 1897 [Pectinidae]
- Chlamys (Radulopecten) (Rollier 1911) [Pectinidae]
- Chlathrus (Oken 1815) [Gastropoda]
- Chlidoniopsis [Chlidoniopsidae]
- Chlidonocrinus, Strimple and Watkins 1969 [Ampelocrinidae]
- Chlinocephalus, Ristori 1886 [Euryplacidae]
- Chloridella [Stomatopoda]
- Chlorodiella, Rathbun 1897 [Xanthidae]
- Chlorophthalmus, Bonaparte 1840 [Chlorophthalmidae]
- Chlorostoma, Swainson 1840 [Trochidae]
- Chlupacina [Strophochonetidae]
- Chlupacitoechia [Glossinotoechiidae]
- Chnaurocoelia [Reticulariidae]
- Choanoceras, Lindström 1890 [Choanoceratidae]
- Choanoplasma [Anthozoa]
- Choffatella, Schlumberger 1905 [Cyclamminidae]
- Choffatia [Perisphinctidae]
- Choffaticeras, Hyatt 1903 [Pseudotissotiidae]
- Choia, Walcott 1920 [Choiidae]
- Cholocrinus [Sagenocrinida]
- Cholopilus, Raymond 1924 [Corynexochida]
- Chomatomediocris [Foraminifera]
- Chomatoseris, Thomas 1935 [Microsolenidae]
- Chonaxis, Milne-Edwards and Haime 1851 [Lithostrotionidae]
- Chondagraulos [Corynexochida]
- Chondranomocare, Pospelov and Fedyanina 1958 [Asaphida]
- Chondrastaulina [Ptychopariida]
- Chondraulus [Trepostomida]
- Chondrenchelyiformes, order, Moy-Thomas 1939 [Chondrichthyes]
- Chondrenchelys, Traquair 1888 [Chondrenchelyidae]
- Chondrinouyina, Repina 1965 [Corynexochida]
- Chondroceras [Sphaeroceratidae]
- Chondrocidaris [Cidaridae]
- Chondrocladia [Poecilosclerida]
- Chondrodonta, Stanton 1901 [Chondrodontidae]
- Chondroparia, Lorenz 1906 [Trilobita]
- Chondroplon [Medusae]
- Chondroteuthis, Bode 1933 [Belemnitida]
- Chonellopsis, Schrammen 1937 [Platychoniidae]
- Chonespondylus, Leidy 1868 [Ichthyopterygia]
- Chonetina [Anopliidae]
- Chonetinella, Ramsbottom 1952 [Rugosochonetidae]
- Chonetipustula [Araksalosiidae]
- Chonetoidea, Jones 1928 [Aegiromenidae]
- Choniocardia, Cossmann 1904 [Carditidae]
- Chonopectoides [Monticuliferidae]
- Chonopectus [Chonopectidae]
- Chonophyllum, Milne-Edwards and Haime 1850 [Arachnophyllidae]
- Chonostegites, Milne-Edwards and Haime 1851 [Chonostegitidae]
- Chonostrophia [Chonostrophiidae]
- Chonostrophiella [Chonostrophiidae]
- Choperella [Ambocoeliidae]
- Choreanoceroides [Endocerida]
- Chorilia, Dana 1851 [Epialtidae]
- Choristitella [Choristitidae]
- Choristites, Fischer de Waldheim 1825 [Choristitidae]
- Choristoceras, Hauer 1865 [Choristoceratidae]
- Choristograptus [Dendroidea]
- Choristopetalum [Cyclostomata]
- Choristothyris [Terebrataliidae]
- Chorizopora [Chorizoporidae]
- Chorus, Gray 1847 [Thaisidae]
- Chosenia, Kobayashi 1934 [Ptychopariida]
- Chosonodina [Conodontophorida]
- Chostophyllum, Pedder 1982 [Disphyllidae]
- Chotecops, Chlupac 1971 [Phacopidae]
- Choubertella, Hupé 1952 [Fallotaspididae]
- Chouberticyathus [Archaeocyathida]
- Chouteauoceras, Miller and Garner 1953 [Trigonoceratidae]
- Christianella [Christianiidae]
- Christiania, Hall and Clarke 1892 [Christianiidae]
- Christinella [Cheilostomata]
- Christioceras, Nassichuk and Furnish 1965 [Christioceratidae]
- Christophoceras [Cephalopoda]
- Chromis, Lacépède 1802 [Pomacentridae]
- Chrotichthys, Wade 1940 [Perleidiformes]
- Chrustenopora [Chrustenoporidae]
- Chrysalidina [Foraminifera]
- Chrysalidinella [Foraminifera]
- Chrysallida, Carpenter 1856 [Pyramidellidae]
- Chrysalogonium [Nodosariidae]
- Chrysame [Mitridae]
- Chrysoceras [Discosorida]
- Chrysocythere [Podocopida]
- Chrysolepis, Lebedev 1983 [Coelacanthiformes]
- Chrysostoma, Swainson 1840 [Trochidae]
- Chrysothurammina [Foraminifera]
- Chthamalus, Ranzani 1817 [Chthamalidae]
- Chuanbeiphyllum, He 1978 [Phillipsastreidae]
- Chuandianella, Hou and Bergström 1991 [Waptiidae]
- Chuangia, Walcott 1911 [Leiostegiidae]
- Chuangiella, Kobayashi 1935 [Leiostegiidae]
- Chuangiformis [Ptychopariida]
- Chuangiopsis, Kobayashi 1955 [Corynexochida]
- Chuanqianoproetus [Proetidae]
- Chubbina [Rhapydioninidae]
- Chuchiaspis, Chang 1974 [Corynexochida]
- Chulanolenus, Zhang 1983 [Ptychopariida]
- Chungkingichthyes [Ptycholepiformes]
- Chuniola [Loveniidae]
- Churanocyathus [Ajacicyathida]
- Churkinia, Palmer 1968 [Redlichiida]
- Chusenella, Hsu 1942 [Schwagerinidae]
- Chuticeras [Discosorida]
- Chynistrophia [Leptostrophiidae]
- Cianotremella [Cheilostomata]
- Cibicides, Monfort 1808 [Cibicididae]
- Cibicidina [Foraminifera]
- Cibicidoides [Cibicididae]
- Cibicorbis [Foraminifera]
- Cicatellia [Cardiida]
- Cicatrea [Cardiida]
- Cicatrites [Cephalopoda]
- Ciceragnostus, Kobayashi 1937 [Peronopsidae]
- Cicerocrinus, Sollas 1900 [Pisocrinidae]
- Ciclopecten, Seguenza 1877 [Pectinidae]
- Cidarina, Dall 1909 [Calliotropidae]
- Cidaris, Leske 1778 [Cidaridae]
- Cidaropsis [Hemicidaridae]
- Cigara [Eocrinoidea]
- Cigelirina [Neogastropoda]
- Cilara [Neogastropoda]
- Ciliatocardium, Kafanov 1974 [Cardiidae]
- Cilinella [Heterorthidae]
- Ciliocephalus, Liu 1977 [Ptychopariida]
- Ciliophora, phylum [Biciliata]
- Ciliscutellum, Lin 1987 [Ptychopariida]
- Cillia [Cheilostomata]
- Cimicinella [Cimicinellidae]
- Cimicinoides [Cimicinellidae]
- Cimoliasaurus, J. Leidy 1851 [Elasmosauridae]
- Cimolichthys, J. Leidy [Enchodontidae]
- Cimoliocentrum, Cossmann 1909 [Purpurinidae]
- Cimolithium, Cossmann 1906 [Procerithiidae]
- Cimomia, Conrad 1866 [Hercoglossidae]
- Cincinnaticoncha [Palaeocopida]
- Cincinnaticrinus, Warn and Strimple 1977 [Crinoidea]
- Cincinnatidiscus, Bassler 1935 [Hemicystitidae]
- Cincliderma [Hexactinosa]
- Cinclopyramis, Haeckel 1879 [Acropyramididae]
- Cincoriola [Foraminifera]
- Cincta [Zeilleriidae]
- Cincta, order, Jaekel 1918 [Homostelea]
- Cinctifera [Productellidae]
- Cinctipora [Cinctiporidae]
- Cinctoceras, Flower 1957 [Mandaloceratidae]
- Cinctopsis [Zeilleriidae]
- Cinerorthis [Glyptorthidae]
- Cingolospiriferina [Spiriferinidae]
- Cingula, Fleming 1818 [Rissoidae]
- Cingulella [Obolellida]
- Cingulina, Adams 1861 [Pyramidellidae]
- Cinguliturris [Neogastropoda]
- Cingulochitina [Rhizopodea]
- Cingulodermis [Tenellodermidae]
- Cinulia, Gray 1847 [Ringiculidae]
- Cionobrissus [Brissidae]
- Cionodendron, Benson and Smith 1923 [Lithostrotionidae]
- Ciperozea [Foraminifera]
- Cipliacella [Chamidae]
- Circe, Schumacher 1817 [Veneridae]
- Circeis [Serpulimorpha]
- Circibiopora [Cyclostomata]
- Circinatiella [Nubeculariidae]
- Circomphalus, Mörch 1853 [Veneridae]
- Circonularia [Scyphozoa]
- Circophyllia, Milne-Edwards and Haime 1848 [Mussidae]
- Circophyllum, Lang and Smith 1939 [Kodonophyllidae]
- Circopora [Axinellida]
- Circothecida, order, Sysoev 1968 [Orthothecimorpha]
- Circulaforma, Cheng 1986 [Ceratoikiscidae]
- Circulina, J. J. Sepkoski 2002 [Palaeocopida]
- Circulocrania, Fortey and Owens 1987 [Cyclopygidae]
- Circulopsis [Ataphridae]
- Circuloscala, de Boury 1886 [Epitoniidae]
- Circulus, Jeffreys 1842 [Vitrinellidae]
- Circumtextiphyllum, Kaplan 1971 [Columnariidae]
- Cirillia [Neogastropoda]
- Cirolana, Leach 1818 [Cirolanidae]
- Cirpa [Wellerellidae]
- Cirquella, Fri 1993 [Olenellida]
- Cirroceras, Conrad 1866 [Nostoceratidae]
- Cirrus, J. C. Sowerby 1816 [Cirridae]
- Cirsocerithium, Cossmann 1906 [Procerithiidae]
- Cirsochilus, Cossmann 1888 [Ataphridae]
- Cirsomphalus, Cossmann 1907 [Amnicolidae]
- Cirsonella, Angas 1877 [Turbinidae]
- Cirsope, Cossmann 1888 [Elachisinidae]
- Cirsostylus, Cossmann 1918 [Archaeogastropoda]
- Cirsotrema, Mörch 1852 [Epitoniidae]
- Cirsotrema (Coroniscala) (de Boury 1910) [Epitoniidae]
- Cisalveolina [Alveolinidae]
- Cistacythereis [Podocopida]
- Citharichthys, Bleeker 1862 [Bothidae]
- Citharina, d'Orbigny 1839 [Nodosariidae]
- Citharinella [Foraminifera]
- Citharus, Reinhardt 1838 [Pleuronectiformes]
- Citrella [Podocopida]
- Cittarium, Philippi 1847 [Trochidae]
- Civrieuxia [Foraminifera]
- Cladangia, Milne-Edwards and Haime 1851 [Rhizangiidae]
- Cladarocythere [Podocopida]
- Cladiscites, E. v. Mojsisovics 1879 [Cladiscitidae]
- Cladoceramus, Seitz 1961 [Inoceramidae]
- Cladochitina [Rhizopodea]
- Cladocora, Ehrenberg 1834 [Faviidae]
- Cladocoropsis, Felix 1907 [Cladocoropsidae]
- Cladodermia, Schrammen 1924 [Theonellidae]
- Cladodia [Demospongea]
- Cladodictya [Cryptostomata]
- Cladolithosia [Demospongea]
- Cladophyllia, Milne-Edwards and Haime 1851 [Amphiastreidae]
- Cladopora, Hall 1851 [Pachyporidae]
- Cladorhiza [Poecilosclerida]
- Cladoselache, Dean 1894 [Cladoselachidae]
- Cladoselachida, order, Dean 1909 [Chondrichthyes]
- Cladospyris [Nassellaria]
- Claibornia [Archaeogastropoda]
- Claibornites, Stewart 1930 [Lucinidae]
- Clambites [Cephalopoda]
- Clanculus, Monfort 1810 [Trochidae]
- Clanculus (Clanculopsis), Monterosato 1879 [Trochidae]
- Clappaspis, Deiss 1939 [Alokistocaridae]
- Claraia, Bittner 1901 [Pterinopectinidae]
- Claratrypa [Atrypinidae]
- Clarazia, Peyer 1936 [Thalattosauria]
- Clarella, Howel 1934 [Centropleuridae]
- Clariondia, Hupe 1953 [Redlichiida]
- Clarkeia [Eatoniidae]
- Clarkeipterus, Kjellesvig-Waering 1966 [Dolichopteridae]
- Clarkella [Clarkellidae]
- Clarkeocrinus, Goldring 1923 [Monobathrida]
- Clarkeolepis [Lepidocoleomorpha]
- Clarkesvillia, Flower 1946 [Westonoceratidae]
- Claruscoscinus, R.C. Handfield 1971 [Archaeocyathida]
- Clathricoscinus [Capsulocyathida]
- Clathricyathus [Ajacicyathida]
- Clathrispongia [Porifera]
- Clathrithyris [Clathrithyrididae]
- Clathrobaculus [Gordenellidae]
- Clathroceras, Foerste 1926 [Trimeroceratidae]
- Clathrochitina [Rhizopodea]
- Clathrocoilona, Yavorsky 1931 [Stromatoporellidae]
- Clathrocrinus, H.L. Strimple and R.C. Moore 1971 [Cladida]
- Clathrocyclas, Haeckel 1881 [Theopiliidae]
- Clathrodictyella, Bogoyavlenskaya 1965 [Amphiporidae]
- Clathrodictyon, Nicholson and Murie 1878 [Clathrodictyidae]
- Clathrodrillia, Dall 1918 [Turridae]
- Clathrodrillia (Carinodrillia), Dall 1919 [Turridae]
- Clathromangelia [Neogastropoda]
- Clathropora [Cryptostomata]
- Clathroscala, de Boury 1889 [Epitoniidae]
- Clathrospongia [Reticulosa]
- Clathrospyris [Nassellaria]
- Clathrostroma [Gerronostromatidae]
- Clathrus, Oken 1815 [Epitoniidae]
- Clathurella, Carpenter 1857 [Turridae]
- Claudiconcha [Petricolina]
- Claudostriatella [Foraminifera]
- Clausa [Cyclostomata]
- Clausastraea (d'Orbigny 1850) [Montlivaltiidae]
- Clausastraeopsis [Scleractinia]
- Clausia [Conchyliocarida]
- Clausinella, Gray 1851 [Veneridae]
- Clausotrypa [Nikiforovellidae]
- Clava, Martyn 1784 [Cerithiidae]
- Clavachitina [Rhizopodea]
- Clavagella, Blainville 1817 [Clavagellidae]
- Clavagnostus, Howell 1937 [Clavagnostidae]
- Clavaspidella, Poulson 1927 [Dolichometopidae]
- Clavatellus, Poletaeva 1955 [Asaphida]
- Clavatorella [Foraminifera]
- Clavatula, Lamarck 1801 [Turridae]
- Clavellofusus, Grabau 1904 [Fasciolariidae]
- Clavelloides [Foraminifera]
- Claviaster [Cassiduloida]
- Clavibole, Hahn and Brauckmann 1982 [Proetida]
- Clavicava [Cyclostomata]
- Claviculacrinus, Donovan 1989 [Crinoidea]
- Clavidictyon [Stromatoporoidea]
- Clavidiscus [Isorophida]
- Clavidrupa [Neogastropoda]
- Clavigellus, Geyer 1994 [Corynexochida]
- Clavigera [Diplospirellidae]
- Clavigerinella [Foraminifera]
- Clavihedbergella [Foraminifera]
- Clavilasma, Weyer 1975 [Antiphyllidae]
- Clavilithes, Swainson 1840 [Fasciolariidae]
- Clavipholas, Conrad 1868 [Pholadidae]
- Claviphyllum, Hudson 1942 [Antiphyllidae]
- Claviporella [Cheilostomata]
- Clavisparsa [Cyclostomata]
- Claviticinella [Foraminifera]
- Clavitubigera [Cyclostomata]
- Clavocerithium [Cerithiidae]
- Clavodalejina [Rhipidomellidae]
- Clavofabella [Palaeocopida]
- Clavofabellina [Palaeocopida]
- Clavohamulus [Conodontophorida]
- Clavstoma [Neogastropoda]
- Clavulina, d'Orbigny 1826 [Valvulinidae]
- Clavulinoides [Foraminifera]
- Clavulinopsis [Foraminifera]
- Clavulites [Serpulimorpha]
- Clavus, Monfort 1810 [Turridae]
- Cleidochasma [Cheilostomata]
- Cleidochondrella [Pterioida]
- Cleidothaerus, Stutchbury 1830 [Cleidothaeridae]
- Cleiocrinus, Billings 1857 [Diplobathrida]
- Cleiothyridina, Buckman 1906 [Athyrididae]
- Cleistechinus, de Loriol 1882 [Asterostomatidae]
- Cleistocrinus [Sagenocrinida]
- Cleistopora, Nicholson 1888 [Cleistoporidae]
- Cleistosphinctes [Cephalopoda]
- Cleithranchiste [Podocopida]
- Cleithrolepis, Egerton 1864 [Perleididae]
- Clelandia, Cossman 1902 [Kingstoniidae]
- Clelandoceras, Ulrich et al. 1944 [Ellesmeroceratidae]
- Clematocrinus, Jaekel 1898 [Monobathrida]
- Clementia, Gray 1847 [Veneridae]
- Cleobula [Conidae]
- Cleodictya [Reticulosa]
- Cleoniceras, Parona and Bonarelli 1897 [Cleoniceratidae]
- Cleoprion [Coleoloida]
- Clepsydrospongia [Reticulosa]
- Cletocythereis [Podocopida]
- Clibanarius, Dana 1852 [Diogenidae]
- Clidiophora, P. P. Carpenter 1864 [Pandoridae]
- Clidochirus [Sagenocrinida]
- Clidoderma, Bleeker 1862 [Pleuronectiformes]
- Clifdenella [Calcarea]
- Clifdenia [Neogastropoda]
- Cliffia, Wilson 1951 [Phylacteridae]
- Cliftonia, Foerste 1909 [Triplesiidae]
- Cliftonoceras, Flower 1957 [Uranoceratidae]
- Climacammina, Brady 1873 [Palaeotextulariidae]
- Climacina, Gemmellaro 1878 [Procerithiidae]
- Climacoconus [Scyphozoa]
- Climacograptus, Hall 1865 [Bireclinata]
- Climacoidea [Podocopida]
- Climacospongia, Hinde 1884 [Anthaspidellidae]
- Climacotrigonia [Trigoniida]
- Climatiiformes, order, Berg 1940 [Acanthodii]
- Clinambon, Schuchert and Cooper 1932 [Clitambonitidae]
- Clinapertina [Foraminifera]
- Clinocardium, Keen 1936 [Cardiidae]
- Clinoceras, Mascke 1876 [Clinoceratidae]
- Clinoclimacograptus [Graptoloidea]
- Clinocythere [Podocopida]
- Clinopegma, Grant and Gale 1931 [Buccinidae]
- Clinophyllum, Grove 1935 [Hapsiphyllidae]
- Clinopista [Nuculida]
- Clinopora [Cyclostomata]
- Clintiella [Palaeocopida]
- Clintonella [Atrypinidae]
- Clinura, Bellardi 1875 [Turridae]
- Clinurella [Neogastropoda]
- Clinuropsis [Speightiidae]
- Clinus, Cuvier 1817 [Perciformes]
- Clio, Linnaeus 1767 [Cavoliniidae]
- Cliocystiramus [Cystoporata]
- Cliona [Clionaidae]
- Clionyssiceras, Foerste 1930 [Acleistoceratidae]
- Cliopteria [Pterioida]
- Clioscaphites [Scaphitidae]
- Cliotrypa [Cystoporata]
- Clisiophyllum, Dana 1846 [Aulophyllidae]
- Clisocolus, Gabb 1868 [Mactromyidae]
- Clistoceras, Nassichuk 1967 [Glaphyritidae]
- Clistocrinus, Kirk 1937 [Cladida]
- Clistotrema, Rowell 1963 [Ceratretidae]
- Clitambonites, Pander 1830 [Clitambonitidae]
- Clitendoceras, Ulrich and Foerste 1936 [Proterocameroceratidae]
- Clithriellum [Schizoporellidae]
- Clithrocytheridea, J. J. Sepkoski 2002 [Podocopida]
- Clivospirifer [Cyrtospiriferidae]
- Clivuloturris [Neogastropoda]
- Cloghergnathus [Conodontophorida]
- Cloioceras [Cephalopoda]
- Clonocrinus, Quenstedt 1876 [Monobathrida]
- Clonograptus, Nicholson 1973 [Dendroidea]
- Clonopora [Cyclostomata]
- Clonosmilia, Chevalier 1963 [Scleractinia]
- Clorinda, Barrande 1879 [Clorindidae]
- Clorindella [Clorindidae]
- Clorindina [Clorindidae]
- Clorindinella [Clorindidae]
- Closia [Volutidae]
- Closteriscus [Neogastropoda]
- Closterocrinus, Hall 1852 [Monobathrida]
- Closteroides [Neogastropoda]
- Cloudella [Meganterididae]
- Cloudina, Germs 1972 [Cloudinidae]
- Cloudina [Bellerophontida]
- Cloudothyris [Centronellidae]
- Cloughtonia, Hudleston 1882 [Purpurinidae]
- Cluniaster [Echinoneoida]
- Clupavus [Pachycormiformes]
- Clupeiformes, order, Bleeker 1859 [Actinopteri]
- Clustinia [Odontopleurida]
- Cluthia [Podocopida]
- Cluthoceras, E. D. Currie 1954 [Muensteroceratidae]
- Clydagnathus [Ozarkodinida]
- Clydonaspis [Pteraspidomorphes]
- Clydonautilus, Mojsisovics 1882 [Clydonautilidae]
- Clydoniceras [Cephalopoda]
- Clydonites, Hauer 1860 [Clydonitidae]
- Clymenia, Münster 1834 [Clymeniidae]
- Clymeniida, order, J. J. Sepkoski 2002 [Cephalopoda]
- Clymenoceras, Schindewolf 1938 [Phenacoceratidae]
- Clymenonautilus, Hyatt in Zittel 1900 [Syringonautilidae]
- Clypeanthus [Cassiduloida]
- Clypeina, Michelin 1845 [Acetabulariaceae]
- Clypeola, Gray 1867 [Calyptraeidae]
- Clypeolampas [Clypeolampadidae]
- Clypeolum [Archaeogastropoda]
- Clypeomorus, Jousseaume 1888 [Cerithiidae]
- Clypeopygus [Nucleolitidae]
- Clypeorbis [Foraminifera]
- Clypidina, Gray 1847 [Emarginulinae]
- Clypoproetus, Begg 1939 [Proetida]
- Clytiella, Glaessner 1931 [Clytiopsidae]
- Clytiopsis, Bill 1914 [Clytiopsidae]
- Clytoceras [Estonioceratidae]
- Clyxhydra [Hydroida]
- Cnemaulax [Demospongea]
- Cnemicopanon [Pharetronida]
- Cnemidiastrum, Zittel 1878 [Cnemidiastridae]
- Cnemidopyge, Whittard 1955 [Raphiophoridae]
- Cnesterium, Dall 1898 [Yoldiidae]
- Cnestocythere [Podocopida]
- Cnestriella [Nuculida]
- Cnidaria, phylum, Hatschek 1888 [Neuralia]
- Coalcomana, Harris and Hodson 1922 [Caprinuloideidae]
- Coalingodea, Durham 1942 [Cassididae]
- Cobbanoscaphites [Pachydiscidae]
- Cobboldiella [Globorilida]
- Cobboldites, Kobayshi 1943 [Weymouthiidae]
- Cobcrephora [Polyplacophora]
- Cobelodus, Zangerl 1973 [Symmoriidae]
- Cobitopsis, Pomel 1853 [Beloniformes]
- Coccocephalichthys, Whitley 1940 [Palaeonisciformes]
- Coccocyclia, Haeckel 1881 [Coccodiscidae]
- Coccodentalium, Sacco 1896 [Dentaliidae]
- Coccoderma, Zittel 1887 [Laugiidae]
- Coccodiscus, Haeckel 1862 [Coccodiscidae]
- Coccodus [Pycnodontidae]
- Coccolarcus [Spumellaria]
- Coccolarnacium, Dumitrica 1989 [Larnacillidae]
- Coccophyllum, Reuss 1865 [Stylophyllidae]
- Coccopigya [Archaeogastropoda]
- Coccoseris, Eichwald 1855 [Coccoserididae]
- Cocculina, Dall 1882 [Cocculinidae]
- Cocculinella, Thiele 1909 [Cocculinellidae]
- Cochlearites [Pterioida]
- Cochleiferoceras, Shimanskiy 1962 [Bactritida]
- Cochleochilus [Archaeogastropoda]
- Cochlespira, Conrad 1865 [Turridae]
- Cochlespirella, Casey 1903 [Neogastropoda]
- Cochlespiropsis, Casey 1904 [Neogastropoda]
- Cochliconus [Neogastropoda]
- Cochlioceras, Eichwald 1860 [Baltoceratidae]
- Cochloceras, Hauer 1860 [Cochloceratidae]
- Cochlocrioceras, Spath 1950 [Protancyloceratidae]
- Cochlodesma, Couthouy 1839 [Periplomatidae]
- Cocoarota [Foraminifera]
- Codakia, Scopoli 1777 [Lucinidae]
- Codalucina, Stewart 1930 [Lucinidae]
- Codaster, F. M'Coy 1849 [Codasteridae]
- Codiacrinus, L. Schultze 1866 [Cladida]
- Codiacystis [Diploporita]
- Codiopsis [Arbaciidae]
- Codoceras, Hyatt 1900 [Polyelasmoceratidae]
- Codonella [Spirotrichia]
- Codonellina [Cheilostomata]
- Codonoconus [Mollusca]
- Codonofusiella, Dunbar and Skinner 1937 [Schubertellidae]
- Codonophyllum, Wedekind 1927 [Codonophyllidae]
- Codonosmilia, Koby 1888 [Rhipidogyridae]
- Coelacanthopsis [Coelacanthiformes]
- Coelastarte [Astartidae]
- Coelenteratella [Anthozoa]
- Coeliocrinus, White 1863 [Cercidocrinidae]
- Coelobolma, Cossmann 1918 [Archaeogastropoda]
- Coelocaulis [Cystoporata]
- Coeloceras [Coeloceratidae]
- Coelocerodontus [Conodontophorida]
- Coelochilina [Palaeocopida]
- Coelocladia, Girty 1908 [Heliospongiidae]
- Coeloclemis [Stenoporidae]
- Coelocochlea [Cyclostomata]
- Coelocoenia, Volz 1896 [Scleractinia]
- Coeloconia [Pharetronida]
- Coelocorypha, Zittel 1878 [Azoricidae]
- Coelocrinus, Meek and Wothen 1865 [Monobathrida]
- Coelocyprina, Douvillé 1921 [Arcticidae]
- Coelocyrtoceras, Foerste 1926 [Polyelasmoceratidae]
- Coelocystis, Schuchert 1903 [Rhombifera]
- Coeloderoceras [Phricodoceratidae]
- Coelodiscus, Broesamlen 1909 [Coelodiscidae]
- Coelodus, Haeckel [Pycnodontidae]
- Coeloenellina [Palaeocopida]
- Coelograptus [Graptolithina]
- Coelolasma, Weyer 1973 [Lambelasmatidae]
- Coelolepis [Thelodontidae]
- Coeloma, Milne-Edwards 1865 [Mathildellidae]
- Coelomeandra [Scleractinia]
- Coelometra, Rasmussen 1978 [Comatulida]
- Coelonella [Coelonellidae]
- Coelopis, Munier-Chalmas 1887 [Astartidae]
- Coelopleurus [Arbaciidae]
- Coelopora [Cheilostomata]
- Coeloptychium, Goldfuss 1826 [Coeloptychidae]
- Coelopus, A. Etallon 1861 [Longodromitidae]
- Coeloscapha, MacNeil in MacNeil & Dockery 1984 [Cephalaspida]
- Coeloscleritophora, class, Bengston and Missarzhevsky 1981 [Problematica]
- Coeloscyphia, Tate 1865 [Polyblastidiidae]
- Coelospira, Hall 1863 [Anoplothecidae]
- Coelospirella [Anoplothecidae]
- Coelospirina [Anoplothecidae]
- Coelospiropora [Cyclostomata]
- Coelosteus, Gross 1930 [Ctenacanthiformes]
- Coelostylis, Lindström 1880 [Lambelasmatidae]
- Coeloterorhynchus [Pugnacidae]
- Coeloteuthis [Belemnitida]
- Coemansia [Heterostrophia]
- Coenangia [Rhizangiidae]
- Coenaphrodia, Jull 1974 [Aphrophyllidae]
- Coenaspis, Resser 1938 [Ptychopariida]
- Coenastraea, Etallon 1859 [Actinastreidae]
- Coenites, Eichwald 1829 [Coenitidae]
- Coenobita, Latreille 1829 [Coenobitidae]
- Coenocyathus, Milne-Edwards and Haime 1848 [Caryophylliidae]
- Coenostella [Axinellida]
- Coenostroma, Winchell 1867 [Coenostromatidae]
- Coenothyris, Douvillé 1879 [Dielasmatidae]
- Coignops, Gandl 1980 [Proetida]
- Coilopoceras, Hyatt 1903 [Coilopoceratidae]
- Colacchilina [Palaeocopida]
- Colania, Lee 1933 [Foraminifera]
- Colaniella [Colaniellidae]
- Colapterochiton [Neoloricata]
- Colaptomena, Cooper 1956 [Rafinesquinidae]
- Colchidites [Ancyloceratidae]
- Coledium, Grant 1965 [Stenoscismatidae]
- Coleia, Broderip 1835 [Coleiidae]
- Coleiconus [Foraminifera]
- Coleites [Foraminifera]
- Coleodus [Conodontophorida]
- Coleoloida, order [Problematica]
- Coleophyllum, Hall 1883 [Cystiphyllidae]
- Coleopora [Cheilostomata]
- Colina, H. Adams and A. Adams 1854 [Cerithiidae]
- Colinella [Laqueidae]
- Collapora [Cyclostomata]
- Collarina [Cribrilinidae]
- Collarothyris, Modzalevskaya 1970 [Athyrididae]
- Colletosia [Umbonulidae]
- Colletostracia, Farrell 1992 [Strophomenida]
- Collibolbina [Palaeocopida]
- Collicyrtidium [Nassellaria]
- Collignonicardia [Cardiida]
- Collignoniceras, Breistroffer 1947 [Collignoniceratidae]
- Collinithyris [Sellithyrididae]
- Collisboris [Podocopida]
- Collisella, Dall 1871 [Lottiidae]
- Collonia, Gray 1850 [Ataphridae]
- Collonista, Iredale 1918 [Turbinidae]
- Collotia [Reineckeiidae]
- Collura [Cheilostomata]
- Collyrites [Collyritidae]
- Collyrolenus, Hupe 1952 [Ptychopariida]
- Collyropsis [Disasteridae]
- Colneptunus, Lorenthey 1929 [Portunidae]
- Coloceras [Liroceratidae]
- Colombiceras, Spath 1923 [Deshayesitidae]
- Colomia [Foraminifera]
- Colomiellia [Calpionellida]
- Colomita [Foraminifera]
- Colonammina [Hemisphaeramminidae]
- Colongina [Spiriferida]
- Colonograptus [Graptoloidea]
- Coloradoscaphites [Cephalopoda]
- Colossaspis, Zhang 1983 [Odontopleurida]
- Colostracon, Hamlin 1884 [Acteoninidae]
- Colpentolium [Pterioida]
- Colpichthys, Hubbs 1918 [Atheriniformes]
- Colpocoryphe, Novak and Perner 1918 [Calymenidae]
- Colpodecrinus, Sprinkle and Kolata 1982 [Diplobathrida]
- Colpophyllia, Milne-Edwards and Haime 1848 [Faviidae]
- Colposigma, Finlay and Marwick 1937 [Turritellidae]
- Colpospongia [Lyssacinosida]
- Colpostomia [Heterostrophia]
- Colpotiara [Hemicidaroidea]
- Colubraria, Schumacher 1817 [Buccinidae]
- Colubrellina, Fischer 1884 [Bursidae]
- Columactinastraea, Alloiteau 1952 [Actinastreidae]
- Columastrea, d'Orbigny 1849 [Columastreidae]
- Columbarium, von Martens 1881 [Turbinellidae]
- Columbella, Lamarck 1799 [Columbellidae]
- Columbellisipho [Neogastropoda]
- Columbellopsis, Bucquoy et al. 1882 [Columbellidae]
- Columbicrinus, Ulrich 1924 [Heterocrinidae]
- Columbitrigonia [Trigoniida]
- Columellaespongia [Demospongea]
- Columellithyris [Zeilleriidae]
- Columellogyra, Turnsek 1976 [Faviidae]
- Columenoceras, Barskov 1960 [Geisonoceratidae]
- Columna [Stromatoporoidea]
- Columnaphyllia, Geyer 1955 [Axosmiliidae]
- Columnaria, Goldfuss 1826 [Columnariidae]
- Columnaxon, Scrutton 1971 [Cyathaxoniidae]
- Columnocoenia, Alloiteau 1952 [Placocoeniidae]
- Columnogyra, Beauvais 1976 [Rhipidogyridae]
- Columnolasma, Pavlova 1973 [Stauriidae]
- Columnoporella, Sokolov and Tesakov 1963 [Anthozoa]
- Columnostroma, Bogoyavlenskaya 1972 [Syringostromatidae]
- Columnotheca [Scorioporidae]
- Colus, Röding 1798 [Buccinidae]
- Coluzea, Finlay 1926 [Turbinellidae]
- Colveraia, Klinghardt 1921 [Radiolitidae]
- Colwellia, Nuttall and Cooper 1973 [Nassariidae]
- Comaliamma [Mayncinidae]
- Comanchia, Frederickson 1950 [Idahoiidae]
- Comanthocrinus, Springer 1921 [Monobathrida]
- Comarmondia, Monterosato 1844 [Neogastropoda]
- Comaroceras [Discosorida]
- Comarocystites, Billings 1854 [Comarocystitida]
- Comarocystitida, order, Parsley and Mintz 1975 [Paracrinoidea]
- Comaster, Agassiz 1836 [Comatulida]
- Comatopoma [Giraldiellidae]
- Comatulida, order, and Clark 1908 [Crinoidea]
- Comatulina, Orbigny 1852 [Comatulida]
- Combinivalvula, Hou 1987 [Archaeocopida]
- Combophyllum, Milne-Edwards and Haime 1850 [Combophyllidae]
- Cometicercus [Furcacudiformes]
- Cominella, Gray 1850 [Buccinidae]
- Cominella (Austrocominella), Ihering 1907 [Buccinidae]
- Cominista [Neogastropoda]
- Comiotoechia [Ladogiidae]
- Comitas, H. Finlay 1926 [Turridae]
- Comluella, Hupe 1953 [Ellipsocephalidae]
- Commonozonispira [Archaeogastropoda]
- Commutatophyllum, Kaplan 1971 [Cyathophyllidae]
- Commutia, Fedorowski 1973 [Pentaphyllidae]
- Comograptus [Graptoloidea]
- Comophyllastraea, Alloiteau 1957 [Montlivaltiidae]
- Comophyllia, d'Orbigny 1849 [Latomeandridae]
- Comophylliopsis, Alloiteau 1957 [Latomeandridae]
- Comoseris, d'Orbigny 1849 [Microsolenidae]
- Compacoleus [Plumulitidae]
- Compagicrinus, Jobson and Paul 1979 [Crinoidea]
- Companteris [Productidae]
- Complanophyllum [Anthozoa]
- Complexastraea [Montlivaltiidae]
- Complexodus [Conodontophorida]
- Complexophyllum [Anthozoa]
- Composita, Brown 1849 [Athyrididae]
- Compositocyathus [Ajacicyathida]
- Compressidens, Pilsbry and Sharp 1897 [Gadilida]
- Compressigerina [Foraminifera]
- Compressiphyllum, Stumm 1949 [Streptelasmatidae]
- Compressoproductus, Sarytcheva 1960 [Monticuliferidae]
- Compsaspis [Demospongea]
- Compsocephalus, Repina 1973 [Dinesidae]
- Compsocrinus, Wachsmuth and Springer 1885 [Monobathrida]
- Compsomyax [Cardiida]
- Comptaluta, Opik 1968 [Archaeocopida]
- Comptonaspis, Brenzinski 1988 [Proetidae]
- Comura, Richter 1927 [Acastidae]
- Comus [Cardiida]
- Conactaeon, Meek 1863 [Cylindrobullinidae]
- Conannulofungia [Ajacicyathida]
- Conarchnium [Nassellaria]
- Conaspis, Hall 1863 [Dokimocephalidae]
- Conbathella [Metacopida]
- Concavatotruncana [Foraminifera]
- Concavella [Foraminifera]
- Concavhithis [Palaeocopida]
- Concavicarida, order, Briggs and Rolfe 1983 [Thylacocephala]
- Concavicaris [Concavicarida]
- Concavodonta, Babin 1972 [Praenuculidae]
- Concavus, Newman 1982 [Balanidae]
- Conchicolites, Nicholson 1872 [Cornulitidae]
- Conchidium, Oehlert 1887 [Subrianidae]
- Conchocele, Gabb 1866 [Cardiida]
- Conchodon [Megalodontidae]
- Conchodus, Pander 1858 [Dipteridae]
- Conchoecia [Myodocopida]
- Concholepas, Lamarck 1801 [Muricidae]
- Conchopeltis [Scyphozoa]
- Conchoprimitella [Palaeocopida]
- Conchoprimites [Palaeocopida]
- Conchoprimitia, Opik 1935 [Palaeocopida]
- Conchothyra, Hutton 1877 [Struthiolariidae]
- Conchyliocarida, order, Secretan 1985 [Thylacocephala]
- Concinnispira [Archaeogastropoda]
- Concinnispirifer [Hysterolitidae]
- Concinnithyris [Gibbithyrididae]
- Condomyra [Podocopida]
- Condonella, McLellan 1927 [Euomphalidae]
- Condonofusiella [Foraminifera]
- Condracypris [Bairdiocyprididae]
- Condranema [Vinellidae]
- Condraoceras, Miller et al. 1947 [Liroceratidae]
- Condrustella [Foraminifera]
- Condylacanthus [Astrophorida]
- Condylocardia, Bernard 1897 [Condylocardiidae]
- Condylocrinus, Eichwald 1859 [Diplobathrida]
- Condylocuna, Iredale 1936 [Condylocardiidae]
- Condylopyge, Hawle and Corda 1847 [Condylopygidae]
- Conescharellina, d'Orbigny 1852 [Conescharellinidae]
- Confiroma [Nassellaria]
- Confusastraraea, Gerth 1933 [Haplaraeidae]
- Confusiscala, de Boury 1909 [Epitoniidae]
- Conger, Schaeffer 1760 [Congridae]
- Congorhynchus, Darteville and Casier 1949 [Blochiidae]
- Congregopora [Stylasterina]
- Coniatopenia [Pharetronida]
- Conicarcella [Spirotrichia]
- Conicorbitolina [Foraminifera]
- Conicospirillina [Spirillinidae]
- Coniculospongia [Demospongea]
- Coniferina [Podocopida]
- Conilites [Foraminifera]
- Coninoda, Kollmann 1979 [Cassiopidae]
- Coniscala, de Boury 1887 [Epitoniidae]
- Conisia [Holothuroidea]
- Conispirifer [Conispiriferidae]
- Conispongia [Pharetronida]
- Conitubus [Tuboidea]
- Conjectura, Finlay 1926 [Archaeogastropoda]
- Conlinoceras [Acanthoceratidae]
- Connagnostus, Opik 1967 [Agnostidae]
- Connectastrea, Koby 1904 [Amphiastreidae]
- Connectoproductus [Monticuliferidae]
- Conobelus, Stolley 1919 [Belemnitida]
- Conocardioida, order, M. Neumayr 1891 [Rostroconchia]
- Conocaryomma, Lipman 1969 [Conocaryommidae]
- Conocerina, Ulrich and Foerste 1936 [Ellesmeroceratidae]
- Conochitina, Eisenack 1931 [Rhizopodea]
- Conococheaquea [Ptychopariida]
- Conocoelia [Pharetronida]
- Conocoryphe, Hawle and Corda 1847 [Conocoryphidae]
- Conocrinus, Orbigny 1850 [Isocrinida]
- Conocyathus, d'Orbigny 1849 [Turbinoliidae]
- Conodicoelites [Belemnitida]
- Conodiscus, Ulrich and Cooper 1936 [Acrothelidae]
- Conodonta, class, Eichenberg 1930 [Vertebrata]
- Conodontophorida, order, Eichenberg 1930 [Conodonta]
- Conoglobigerina [Foraminifera]
- Conoideocrinus, Klikushin 1987 [Comatulida]
- Conoides, Howel 1937 [Trilobita]
- Conoidocyathus [Cribricyathea]
- Conokephalina, Broegger 1886 [Conokephalinidae]
- Conolagena [Foraminifera]
- Conometra [Comatulida]
- Conomimus [Stringocephalidae]
- Conominolia, Finlay 1926 [Trochidae]
- Conomitra, Conrad 1865 [Costellariidae]
- Conopeum, Gray 1848 [Electridae]
- Conophillipsia, Roberts 1963 [Proetidae]
- Conophyllia, d'Orbigny 1849 [Procyclolitidae]
- Conopiscius [Anaspida]
- Conopolus, Robison 1988 [Ptychopariidae]
- Conopora [Stylasterina]
- Conopoterium, Winchell 1865 [Micheliniidae]
- Conora [Serpulimorpha]
- Conorbina [Foraminifera]
- Conorbinella [Foraminifera]
- Conorbis, Swainson 1840 [Conidae]
- Conorbitoides [Foraminifera]
- Conorboides [Foraminifera]
- Conoredlichia, Chang 1966 [Redlichiida]
- Conorhytis, Cossmann 1907 [Acmaeidae]
- Conorotalites [Foraminifera]
- Conosmilia, Duncan 1865 [Flabellidae]
- Conosphaera [Spumellaria]
- Conostichoceras, Foerste 1926 [Nothoceratidae]
- Conoteuthis [Diplobelidae]
- Conotomaria, Cox 1959 [Pleurotomariidae]
- Conotreta, Walcott 1889 [Acrotretidae]
- Conotrochammina, Finlay 1940 [Conotrochamminidae]
- Conotrochus, Seguenza 1864 [Caryophylliidae]
- Conotubigera [Cyclostomata]
- Conradoceras, Foerste 1926 [Hemiphragmoceratidae]
- Consonopsis [Palaeocopida]
- Conspicillum [Palaeocopida]
- Constantina, Cisne 1970 [Proetida]
- Constellaria, Dana 1846 [Cystoporida]
- Constileioceras [Cephalopoda]
- Contemniscala, de Boury 1909 [Epitoniidae]
- Contignatindocrinus, Arendt 1981 [Cladida]
- Contocrinus, Knapp 1969 [Graphiocrinidae]
- Contortella, Pchelintsev 1965 [Nerinellidae]
- Contortophyllum, Strelnikov 1968 [Expressophyllidae]
- Contracheirurus, Chatterton and Perry 1984 [Cheiruridae]
- Contractenus, Ljaschenko 1959 [Contractenidae]
- Contradouvillina [Douvillinidae]
- Contusotruncana [Foraminifera]
- Conularia [Conulariidae]
- Conulariella [Scyphozoa]
- Conularina [Scyphozoa]
- Conuloblastus [Spiraculata]
- Conus (Conus), Linnaeus 1758 [Conidae]
- Convexicaris [Conchyliocarida]
- Convexopecten [Pectinidae]
- Convexothyris [Harpotothyrididae]
- Convoluticeras, Erben 1960 [Teicherticeratidae]
- Cookia [Archaeogastropoda]
- Cookobryozoon [Ctenostomata]
- Coolinia, B. B. Bancroft 1949 [Chilidiopsidae]
- Coollarocrinus [Cyrtocrinida]
- Cooperatia [Metacopida]
- Cooperella, Carpenter 1864 [Cardiida]
- Cooperellopsis [Cardiida]
- Cooperidiscus, Bassler 1935 [Agelacrinitidae]
- Cooperina [Cooperinidae]
- Cooperispira [Neoretziidae]
- Cooperrhynchia [Dimerellidae]
- Cooperuna [Acratiidae]
- Coosella, Lochman 1936 [Crepicephalidae]
- Coosia, Walcott 1911 [Crepicephalidae]
- Coosina, Rasetti 1956 [Crepicephalidae]
- Coosinoides, Ivshin 1962 [Crepicephalidae]
- Copanognathus, Hussakof and Bryant 1920 [Dinichthyidae]
- Copelandella [Palaeocopida]
- Copelandia [Palaeocopida]
- Cophocara, Stewart 1927 [Neogastropoda]
- Copia, Vasilyuk and Kozyreva 1974 [Aulophyllidae]
- Copicyntra, Nazarov and Ormiston 1985 [Entactiniidae]
- Copicyntroides, Nazarov and Ormiston 1985 [Relindellidae]
- Copidozoum, Harmer 1926 [Calloporidae]
- Copiellintra, Nazarov and Ormiston 1985 [Archaeospongoprunidae]
- Copleicyathus [Archaeocyathida]
- Copodontiformes, order, Obruchev 1953 [Chondrichthyes]
- Copodus, Morris and Roberts 1862 [Copodontidae]
- Coprinoscolex [Echiurida]
- Coprolithina [Foraminifera]
- Coptocampylodon [Gorgonacea]
- Coptochetus, Cossmann 1889 [Neogastropoda]
- Coptodiscus [Holectypidae]
- Coptosipho [Neogastropoda]
- Coptostoma, Cossmann 1899 [Cancellariidae]
- Coptostomella [Neogastropoda]
- Coptothyris, Jackson 1918 [Terebrataliidae]
- Copytus, Skogsberg 1939 [Neocytherideidae]
- Coquandia [Myoida]
- Coquimba [Podocopida]
- Corallidium [Demospongea]
- Corallidomus, Whitfield 1895 [Modiomorphidae]
- Coralliophaga, Blainville 1824 [Trapezidae]
- Coralliophila, Adams and Adams 1853 [Muricidae]
- Corallistes [Demospongea]
- Corallium, Marsigli 1766 [Gorgonacea]
- Coralloceras [Orthocerida]
- Corallospondylus [Pterioida]
- Coraster [Holasteroida]
- Corbariastraea, Alloiteau 1952 [Thamnasteriidae]
- Corbicellopsis, Cox 1929 [Tancrediidae]
- Corbicula, Megerle 1811 [Corbiculidae]
- Corbicularia [Anopliidae]
- Corbiculella [Cardiida]
- Corbiculopsis [Cardiida]
- Corbina [Ptychopariida]
- Corbula, Bruguière 1789 [Corbulidae]
- Corbula (Caryocorbula), Gardner 1926 [Corbulidae]
- Corbula (Hexacorbula), Olsson 1932 [Corbulidae]
- Corbula (Tenuicorbula), Olsson 1932 [Corbulidae]
- Corbulamella, Meek 1857 [Corbulidae]
- Corbulipora, MacGillivray 1895 [Cribrilinidae]
- Corbuloceras [Oncocerida]
- Corbulomima, H. E. Vokes 1945 [Corbulidae]
- Corburella [Cardiida]
- Corcorania [Arthropoda]
- Cordania, Clarke 1892 [Brachymetopidae]
- Cordapeltis, Pribyl and Vanek 1971 [Phacopida]
- Cordatella [Foraminifera]
- Cordatomyonia [Proschizophoriidae]
- Cordiceramus, Heinz 1932 [Inoceramidae]
- Cordieria, Rouault 1848 [Turridae]
- Cordilleracyathus, R.C. Handfield 1971 [Ajacicyathida]
- Cordiopsis [Veneridae]
- Cordispira [Archaeogastropoda]
- Cordiula, Meyer 1887 [Mactromyidae]
- Cordobicyathus [Ajacicyathida]
- Cordubiceras [Cephalopoda]
- Cordyloblastus, R. O. Fay 1961 [Spiraculata]
- Cordylocrinus, Angelin 1878 [Monobathrida]
- Coreanocephalus, Kobayashi 1935 [Ptychaspididae]
- Coreanoceras, Kobayashi 1931 [Manchuroceratidae]
- Corechinus [Holasteroida]
- Corellicarcinus [Decapoda]
- Coremagraptus [Dendroidea]
- Corematocrinus, Goldring 1923 [Cladida]
- Coreocaris [Thylacocephala]
- Coriandria, Tomlin 1917 [Cingulopsidae]
- Corineorthis [Plectorthidae]
- Coriops, R. Estes 1969 [Albulidae]
- Coriothyris [Aulacothyropsidae]
- Coripia [Cardiida]
- Cornellites, Williams 1908 [Pterineidae]
- Corniculina, Klishevich 1967 [Procorniculinidae]
- Corniculinoides, Alberti 1986 [Procorniculinidae]
- Cornicythereis [Podocopida]
- Cornigella, Warthin 1930 [Drepanellidae]
- Cornikloedenia, Henningsmoen 1954 [Beyrichiidae]
- Cornovica, Whittard 1960 [Trilobita]
- Cornuboniscus, White 1939 [Palaeonisciformes]
- Cornucardia, Koken 1913 [Dicerocardiidae]
- Cornucoquimba [Podocopida]
- Cornuella [Orthocerida]
- Cornulina, Conrad 1853 [Melongenidae]
- Cornulina (Afrocornulina), Adegoke 1977 [Melongenidae]
- Cornulitella, Howell 1952 [Cornulitidae]
- Cornulites, Schlotheim 1820 [Cornulitidae]
- Cornulitidae, family, Fischer 1962 [Cornulitida]
- Cornuloculina [Ophthalmidiidae]
- Cornuodus [Strachanognathidae]
- Cornuproetus, Richter and Richter 1919 [Tropidocoryphidae]
- Cornuscutellum, Snajdr 1960 [Styginidae]
- Cornuspira, Schultze 1854 [Cornuspiridae]
- Cornuta, order, Jaekel 1901 [Stylophora]
- Cornutella, Ehrenberg 1838 [Acropyramididae]
- Cornuticella [Cheilostomata]
- Cornutobairdia [Bairdiidae]
- Cornutoentolium [Pterioida]
- Cornutovum, Foreman 1968 [Cannobotryidae]
- Cornwallia, Wilson 1932 [Articulata]
- Corocalyptra [Nassellaria]
- Corocrinus, Goldring 1923 [Monobathrida]
- Coronalosia [Strophalosiidae]
- Coronata, order, O. Jaekel 1918 [Blastoidea]
- Coronatica, Blanckenhorn 1927 [Ampullariidae]
- Coronatida, order [Scyphozoa]
- Corongoceras [Himalayitidae]
- Coronia [Turridae]
- Coroniceras [Arietitidae]
- Coronidmonea [Cyclostomata]
- Coroniopsis [Turridae]
- Coronipora [Involutinidae]
- Coroniscala, de Boury 1910 [Eulimidae]
- Coronites [Pulchelliidae]
- Coronocephalus, Grabau 1924 [Encrinuridae]
- Coronochitina [Rhizopodea]
- Coronocrinus, Hall 1858 [Crinoidea]
- Coronocystis, Paul 1972 [Rhombifera]
- Coronodus, Bryant 1935 [Coronodontidae]
- Coronograptus [Graptoloidea]
- Coronula, Bruguière 1792 [Coronulidae]
- Coronura, Hall and Clarke 1888 [Dalmanitidae]
- Corophiidae, family [Amphipoda]
- Corosaurus, Case 1936 [Eosauropterygia]
- Corphalia, Poty 1975 [Lithostrotionidae]
- Corralio [Demospongea]
- Corrigotubella [Foraminifera]
- Corrosina [Foraminifera]
- Corrugatagnostus, Kobayashi 1939 [Metagnostidae]
- Corrugatella [Foraminifera]
- Corrugatimediorostrum [Rhynchonellida]
- Corrugopora, Stearn 1956 [Theciidae]
- Corsania, Vidal 1917 [Neritidae]
- Cortezorthis, Johnson and Talent 1967 [Dalmanellidae]
- Corthya [Disasteridae]
- Corticium [Astrophorida]
- Cortina, Haeckel 1887 [Stephaniidae]
- Cortinella, Bandel 1988 [Cortinellidae]
- Cortinia [Pholadomyida]
- Cortiniscus [Nassellaria]
- Corum, Blome 1984 [Pseudodictyomitridae]
- Corumbella [Scyphozoa]
- Corunegenys, Wade 1942 [Semionotiformes]
- Corvaspis, Woodward 1934 [Corvaspididae]
- Corveolepis [Pteraspidomorphes]
- Corvinopugnax [Innaechiidae]
- Corwenia, Smith and Ryder 1926 [Aulophyllidae]
- Corycephalus, Hall and Clarke 1888 [Phacopida]
- Coryellites [Metacopida]
- Corylispirifer [Reticulariidae]
- Corylocrinus [Rhombifera]
- Corymbopora [Cyclostomata]
- Corymboporella [Cheilostomata]
- Corymbospongia, Rigby and Potter 1986 [Colospongiidae]
- Corynecrinus, Kirk 1934 [Cladida]
- Corynella [Endostomatidae]
- Corynexochida, order, T. Kobayashi 1935 [Trilobita]
- Corynexochides, Rasetti 1948 [Dolichometopidae]
- Corynexochina, Lermontova 1940 [Corynexochidae]
- Corynexochus, Angelin 1854 [Corynexochidae]
- Corynites [Graptoloidea]
- Corynoides, Nicholson 1867 [Graptoloidea]
- Corynostylus [Cheilostomata]
- Corynotrypa, Bassler 1911 [Corynotrypidae]
- Coryphaenoides, Gunnerus 1765 [Macrouridae]
- Coryphaenopsis, Fric and Bayer 1902 [Elopiformes]
- Coryphopterus, Gill 1863 [Perciformes]
- Coryphostoma, Cushman 1936 [Rotaliina]
- Coryphyllia, Cuif 1974 [Reimaniphylliidae]
- Coryslus [Holasteroida]
- Corysoceras [Oncocerida]
- Coryssochiton, M. D. Debrock et al. 1984 [Lepidopleuridae]
- Corythocrinus, Kirk 1946 [Cladida]
- Corythoecia, Foreman 1963 [Corythoecidae]
- Cosa, Finlay 1926 [Philobryidae]
- Coscinaraea, Milne-Edwards and Haime 1848 [Siderastreidae]
- Coscinaulus, Schrammen 1937 [Callodictyonidae]
- Coscinella, Hall and Simpson 1887 [Stictoporellidae]
- Cosciniopsis [Gigantoporidae]
- Coscinocyathella [Capsulocyathida]
- Coscinocyathellus [Capsulocyathida]
- Coscinocyathus, J.G. Bornemann 1884 [Capsulocyathida]
- Coscinodiscus, Schrammen 1937 [Cylindrophymatidae]
- Coscinodus [Pteraspidomorphi]
- Coscinoecia [Cyclostomata]
- Coscinophragma [Coscinophragmatidae]
- Coscinopleura [Coscinopleuridae]
- Coscinopora, Goldfuss 1826 [Ventriculitidae]
- Coscinoptycta [Ajacicyathida]
- Coscinospira [Peneroplidae]
- Coscinospongia [Demospongea]
- Coscinotrypa [Hexagonellidae]
- Cosjuvia [Anthozoa]
- Coskinolina [Foraminifera]
- Coskinolinoides [Foraminifera]
- Coskinon [Foraminifera]
- Cosmacanthus, Agassiz 1845 [Arthrodira]
- Cosmasyrinx, Marwick 1931 [Turridae]
- Cosmetalepas, Iredale 1924 [Fissurellidae]
- Cosmetocrinus, Kirk 1941 [Aphelecrinidae]
- Cosmiolithus, Lindström 1899 [Stelliporellidae]
- Cosmocrinus, Jaeckel 1898 [Botryocrinidae]
- Cosmogoniophora (McLearn 1918) [Modiomorphidae]
- Cosmolithes, Grabau 1904 [Neogastropoda]
- Cosmomya [Sanguinolitidae]
- Cosmophiline, Berger 1949 [Cephalaspida]
- Cosmoptychius, Traquair 1877 [Palaeonisciformes]
- Cossmannea, Pcelincev 1931 [Nerineidae]
- Cossmannella [Cardiida]
- Cossmannia, Newton 1891 [Rissoidae]
- Cossmannica [Pyramidellidae]
- Costa [Podocopida]
- Costacallista, Palmer 1926 [Veneridae]
- Costaclymenia, Schindewolf 1920 [Costaclymeniidae]
- Costacranaena [Cranaenidae]
- Costaegera [Palaeocopida]
- Costaella [Heterostrophia]
- Costagyra, Vialov 1936 [Gryphaeidae]
- Costaledopsis [Nuculida]
- Costalocrinus, Jaekel 1918 [Botryocrinidae]
- Costanoplia, Xu 1977 [Spiriferida]
- Costatia [Metacopida]
- Costatoleda [Nuculida]
- Costatoria [Myophoriidae]
- Costatrypa [Atrypidae]
- Costatumulus, Waterhouse 1983 [Monticuliferidae]
- Costaveenia [Podocopida]
- Costayella [Foraminifera]
- Costazia [Celleporidae]
- Costeina [Pterioida]
- Costellacesta, Kauffman 1964 [Limidae]
- Costellagerina [Foraminifera]
- Costellamussiopecten [Pectinidae]
- Costellipitar, Habe 1951 [Veneridae]
- Costellirostra [Eatoniidae]
- Costellispirifer [Hysterolitidae]
- Costentolium [Pterioida]
- Costicamptonectes [Pectinidae]
- Costidiscus, Uhlig 1883 [Macroscaphitidae]
- Costifera [Nubeculariidae]
- Costiferina [Productidae]
- Costigervillia, Cox 1948 [Bakevelliidae]
- Costileioceras [Graphoceratidae]
- Costimitoceras, Vöhringer 1960 [Gattendorfiidae]
- Costisorthis [Dalmanellidae]
- Costispinifera [Productellidae]
- Costispirifer, Copper 1942 [Acrospiriferidae]
- Costistricklandia, Amsden 1953 [Stricklandiidae]
- Costistrophomena, Sheehan 1987 [Strophomenidae]
- Costistrophonella [Strophonellidae]
- Costitrimerella, Ron and L 1993 [Trimerellidae]
- Costoconcha [Gillediidae]
- Costocyrena [Neomiodontidae]
- Costokidderia, Finlay 1927 [Gaimardiidae]
- Costokloedenia [Palaeocopida]
- Costonia, Whittard 1956 [Trilobita]
- Costosyrnola [Heterostrophia]
- Costula [Cheilostomata]
- Costulatostyliolina, Lardeux 1969 [Striatostyliolinidae]
- Cotalagnostus, Whitehouse 1936 [Spinagnostidae]
- Cothonion [Anthozoa]
- Cothurnicella [Cheilostomata]
- Cothurnocystis [Cornuta]
- Cothurnocystisbifida [Cornuta]
- Cotonopsis, Olsson 1942 [Columbellidae]
- Cottaldia, Desor 1856 [Arbaciidae]
- Cotteaudia [Echinoidea]
- Cotteroceras, Ulrich and Foerste 1936 [Proterocameroceratidae]
- Cottonia, Iredale 1934 [Volutidae]
- Cottopsis, Girard 1850 [Perciformes]
- Cottreaucorys [Spatangoida]
- Cottreauites [Cephalopoda]
- Cotylederma, Quenstedt 1852 [Cyrtocrinida]
- Cotyliscus [Porifera]
- Couloniceras [Cephalopoda]
- Couloumania, Thoral 1946 [Conocoryphidae]
- Coupatezia, H. Cappetta 1982 [Myliobatiformes]
- Courtessolium, Pribyl and Vanek 1985 [Phacopida]
- Couthouyia, Adams 1860 [Planaxidae]
- Covracythere, Gramm 1975 [Bythocytheridae]
- Cowlitzia, Clark and Palmer 1923 [Strombidae]
- Cowtoniceras [Cephalopoda]
- Coxesia [Mytilida]
- Coxiella [Spirotrichia]
- Coxites [Foraminifera]
- Coxliellina [Spirotrichia]
- Cradeocrinus, Goldring 1923 [Cladida]
- Craftonoceras [Tarphycerida]
- Craginia, Stephenson 1952 [Turritellidae]
- Craigella [Triplesiidae]
- Craigheadia, Hupe 1955 [Ptychopariida]
- Cranaena, J. Hall and J. Clarke 1893 [Cranaenidae]
- Crangopsis, Salter 1863 [Aeschronectida]
- Crania, Retzius 1781 [Craniidae]
- Craniella [Astrophorida]
- Craniida, order, Waagen 1885 [Craniata]
- Craniops, Hall 1859 [Craniopsidae]
- Craniopsida, order, Gorjansky and Popov 1985 [Craniata]
- Craniotreta, Termier and Monod 1978 [Acrotretida]
- Craniscus, Dall 1871 [Craniidae]
- Cranocephalites [Cardioceratidae]
- Cranoceras [Nautilida]
- Cranocrinus, Wanner 1929 [Cladida]
- Cranodus, Trautschold 1879 [Cochliodontidae]
- Cranosina [Calloporidae]
- Craspedites [Cephalopoda]
- Craspedobolbina [Palaeocopida]
- Craspedochiton, Shuttleworth 1853 [Acanthochitonidae]
- Craspedocrinus, Dahmer 1922 [Crinoidea]
- Craspedodiscus [Cephalopoda]
- Craspedographylus [Podocopida]
- Craspedopora [Electridae]
- Craspedoporina [Cheilostomata]
- Craspedops, Raasch 1939 [Aglaspididae]
- Craspedopyxion [Ostracoda]
- Crassacythere [Podocopida]
- Crassadoma, Bernard 1986 [Pectinidae]
- Crassaluna [Cystoporata]
- Crassatella, Lamarck 1799 [Crassatellidae]
- Crassatellina, Meek 1871 [Astartidae]
- Crassatellites, Krueger 1823 [Crassatellidae]
- Crassatellopsis, Beushausen 1895 [Astartidae]
- Crassatina, Kobelt 1881 [Crassatellidae]
- Crassatrypa [Karpinskiidae]
- Crassialveolites, Sokolov 1955 [Alveolitidae]
- Crassiatractites [Aulacocerida]
- Crassicellepora [Calloporidae]
- Crassiceras [Phymatoceratidae]
- Crassicollaria [Calpionellida]
- Crassiconcha [Pholadomyida]
- Crassicoscinus [Ajacicyathida]
- Crassicyclus [Anthozoa]
- Crassifimbra, Lochman 1947 [Antagmidae]
- Crassilabrum, Jousseaume 1880 [Muricidae]
- Crassilasma, Ivanovskiy 1962 [Streptelasmatidae]
- Crassilina, Ljaschenko 1955 [Crassilinidae]
- Crassimarginatella, Canu 1900 [Calloporidae]
- Crassimurex, Merle 1990 [Neogastropoda]
- Crassinella, Guppy 1874 [Crassatellidae]
- Crassiplanulites [Cephalopoda]
- Crassipunctatrypa [Punctatrypidae]
- Crassiscala, de Boury 1887 [Epitoniidae]
- Crassispira, Swainson 1840 [Turridae]
- Crassispirella [Turridae]
- Crassistella, Roniewicz 1989 [Pamiroseriidae]
- Crassodiscopora [Cyclostomata]
- Crassohornera [Cyclostomata]
- Crassophrentis [Anthozoa]
- Crassopleura, Monterosato 1884 [Turridae]
- Crassostrea, Sacco 1897 [Ostreidae]
- Crassotornoceras, House and Price 1985 [Tornoceratidae]
- Crataegocrinus, Manni and Nicosia 1985 [Cyrtocrinida]
- Crateniophyllum [Anthozoa]
- Craterellina [Metacopida]
- Crateroceras, Foerste and Savage 1927 [Acleistoceratidae]
- Craterocrinus, Goldring 1923 [Monobathrida]
- Crateromorpha [Lyssacinosida]
- Craterophyllum, Foerste 1909 [Arachnophyllidae]
- Crateropora [Aspidostomatidae]
- Crateroseris, Tomes 1883 [Synastraeidae]
- Craticularia, Zittel 1877 [Craticulariidae]
- Cratis, Hedley 1915 [Philobryidae]
- Cratochelone, Longman 1915 [Protostegidae]
- Cratorhynchonella [Hebetoechiidae]
- Cratoselache, Woodward 1924 [Ctenacanthidae]
- Cratospirifer, Tong 1986 [Spiriferida]
- Cravenia, Hudson 1928 [Verbeekiellidae]
- Cravenites [Goniatitida]
- Cravenoceras, W. S. Bisat 1928 [Cravenoceratidae]
- Cravenoceratoides, R. G. S. Hudson 1941 [Cravenoceratidae]
- Crawfordina [Neogastropoda]
- Crebriscala, de Boury 1909 [Epitoniidae]
- Cremacrinus, Ulrich 1886 [Crinoidea]
- Cremastoglottos, Whittard 1961 [Asaphida]
- Cremnoceramus, Heinz 1932 [Inoceramidae]
- Cremnorthis, Williams 1963 [Cremnorthidae]
- Crenabolina [Palaeocopida]
- Crenaleya [Podocopida]
- Crenamussium [Pterioida]
- Crenatella [Hauerinidae]
- Crenatocerithium, Grundel 1981 [Cerithiidae]
- Crenatolorica [Neoloricata]
- Crenatula, Lamarck 1803 [Malleidae]
- Crenaturricula, Vokes 1939 [Neogastropoda]
- Crenaverneuilina [Foraminifera]
- Crenella, Brown 1827 [Mytilidae]
- Crenetocerithium (Grundel 1981) [Neotaenioglossa]
- Creniceras [Oppeliidae]
- Crenidens, Cuvier and Valenciennes 1830 [Perciformes]
- Crenidens, Cuvier and Valenciennes 1830 [Perciformes]
- Crenilabium, Cossmann 1889 [Acteonidae]
- Crenipecten [Aviculopectinidae]
- Crenisutura [Neogastropoda]
- Creniturbo [Archaeogastropoda]
- Crenolepis, Carus 1888 [Perleidiformes]
- Crenomytilus, Soot-Ryen 1955 [Mytilidae]
- Crenostrea, Marwick 1931 [Gryphaeidae]
- Crenotrapezium [Neomiodontidae]
- Crenulilimopsis, Kuroda and Habe 1971 [Limopsidae]
- Crenulipora, Le Maître 1956 [Favositidae]
- Crenulostomina [Miliolidae]
- Creonella, B. Wade 1917 [Pyramidellidae]
- Crepicephalina, Resser and Endo 1935 [Crepicephalidae]
- Crepicephalus, Owen 1852 [Crepicephalidae]
- Crepichilella, Wilson 1951 [Ptychopariida]
- Crepidacantha [Crepidacanthidae]
- Crepidophyllia [Anthozoa]
- Crepidula, Lamarck 1799 [Calyptraeidae]
- Crepipatella, Lesson 1830 [Calyptraeidae]
- Crepipora, Ulrich 1882 [Ceramoporidae]
- Crepis [Chlidoniidae]
- Crepispisula, Eames 1957 [Mactridae]
- Crescenticythere [Ostracoda]
- Crescentilla [Palaeocopida]
- Crescis [Cyclostomata]
- Creseis, Rang 1828 [Cavoliniidae]
- Crespinella [Foraminifera]
- Crespinina [Foraminifera]
- Crestjahitus, Syssoiev 1968 [Crestjahitidae]
- Crestoconus [Mollusca]
- Cretaceomurex [Neogastropoda]
- Cretaceratina [Podocopida]
- Cretachlorodus [Decapoda]
- Cretascymnus, Cappetta 1980 [Squaliformes]
- Cretatriacanthus, Tyler and Sorbini 1996 [Tetraodontiformes]
- Cretiscalpellum, Withers 1922 [Calanticidae]
- Cretocardia [Cardiida]
- Cretodus, Sokolov 1965 [Cretoxyrhinidae]
- Cretolamna, Glikman 1958 [Cretoxyrhinidae]
- Cretoxyrhina, Glikman 1958 [Cretoxyrhinidae]
- Creusia, Leach 1817 [Balanidae]
- Cribanocrinus [Rhodocrinitidae]
- Cribella [Cheilostomata]
- Cribellopora [Lacernidae]
- Cribellopsis [Foraminifera]
- Cribranopsis [Foraminifera]
- Cribraria, Jousseaume 1884 [Cypraeidae]
- Cribratina [Cribratinidae]
- Cribrendoecium [Cribrilinidae]
- Cribricyathea, class [Problematica]
- Cribricyathus [Cribricyathea]
- Cribrilaria, Canu and Bassler 1928 [Cribrilinidae]
- Cribrilina [Cribrilinidae]
- Cribroaperturata [Foraminifera]
- Cribroblastus, G. Hambach 1903 [Spiraculata]
- Cribroconcha [Healdiidae]
- Cribroelphidium, Cushman and Bronnimann 1948 [Elphidiidae]
- Cribrogenerina [Palaeotextulariidae]
- Cribrogloborotalia [Foraminifera]
- Cribrogoesella [Foraminifera]
- Cribrohantkenina [Foraminifera]
- Cribrohemisphaeroides [Foraminifera]
- Cribrolenticulina [Foraminifera]
- Cribrolinoides [Spiroloculinidae]
- Cribronodosaria [Nodosariidae]
- Cribrononion [Nonionidae]
- Cribroparrella [Foraminifera]
- Cribropleurostomella [Foraminifera]
- Cribropullenia [Foraminifera]
- Cribrorobulina [Foraminifera]
- Cribrorotalia [Foraminifera]
- Cribrosphaeroides [Parathuramminidae]
- Cribrospira [Foraminifera]
- Cribrospongia, d'Orbigny 1849 [Cribrospongiidae]
- Cribrostomoides [Lituolidae]
- Cribroturretoides [Foraminifera]
- Crickites, Wedekind 1913 [Gephuroceratidae]
- Cricocosmia [Cricocosmiidae]
- Cricocrinus, Strimple and Watkins 1969 [Cladida]
- Cricocyathus, Quenstedt 1881 [Faviidae]
- Cricodictyum [Rhinidictyidae]
- Cricosaurus, A. Wagner 1858 [Metriorhynchidae]
- Crimella [Heterostrophia]
- Crimites, Toumansky 1937 [Adrianitidae]
- Crinerocrinus, Kolata 1982 [Diplobathrida]
- Crininicaminus [Terebellomorpha]
- Crinisaria [Spiriferida]
- Crinisarina [Athyrididae]
- Crinistrophia [Douvillinidae]
- Crinitograptus [Graptoloidea]
- Crinobrachiatus, Moore 1962 [Crinoidea]
- Crinocaulis [Graptolithina]
- Crinoidea, class, J. S. Miller 1821 [Echinodermata]
- Criocardium, Conrad 1870 [Cardiidae]
- Crioceras, d'Orbigny 1842 [Crioceratitidae]
- Crioceratites, Leveillé 1837 [Crioceratitidae]
- Crioceratites (Menuthiocrioceras), Collignon 1949 [Crioceratitidae]
- Criotypus, Opik 1979 [Ptychagnostidae]
- Crisia [Crisiidae]
- Crisidia [Cyclostomata]
- Crisidmonea [Cyclostomata]
- Crisiella [Cyclostomata]
- Crisina [Idmoneidae]
- Crisinella [Cyclostomata]
- Crisiona [Cyclostomata]
- Crisisina [Cyclostomata]
- Crispispongia [Stellispongiidae]
- Crispus [Cribricyathea]
- Crista, Tsyganko 1971 [Fasciphyllidae]
- Cristaeleberis [Podocopida]
- Cristafrons, R. Feldmann et al. 1993 [Raninidae]
- Cristagnostus, Rushton 1978 [Agnostida]
- Cristalloella [Tofanellidae]
- Cristatodus [Problematica]
- Cristellariopsis [Foraminifera]
- Cristicoma, Popov 1980 [Torynelasmatidae]
- Cristigerina, Lerich 1905 [Perciformes]
- Cristodus [Conodontophorida]
- Crisulipora [Cyclostomata]
- Crocodilaemus, Jourdan 1857 [Reptilia]
- Croixana, Nelson 1951 [Parabolinoididae]
- Crolanium, Pessagno 1977 [Xitidae]
- Cromatrypa, Havlí?ek 1987 [Lissatrypidae]
- Crommium, Cossmann 1888 [Naticidae]
- Crommium (Euspirocrommium), Sacco 1890 [Naticidae]
- Cromus, Barrande 1852 [Encrinuridae]
- Cromyocrinus, Trautschold 1867 [Cladida]
- Cromyodruppa, Haeckel 1887 [Litheliidae]
- Cromyodruppocarpus [Spumellaria]
- Cromyomma, Haeckel 1862 [Actinommidae]
- Cromyostaurolonche [Spumellaria]
- Croneisella [Saccamminidae]
- Cronia, H. Adams and A. A 1853 [Thaididae]
- Cronyphyllum, Ulitina 1975 [Kodonophyllidae]
- Crossacanthia [Productellidae]
- Crossata, Jousseaume 1881 [Bursidae]
- Crossbitheca [Circothecida]
- Crossea, Adams 1865 [Turbinidae]
- Crosseola, Iredale 1924 [Turbinidae]
- Crossiskenidium [Skenidiidae]
- Crossognathiformes, order, Taverne 1989 [Actinopteri]
- Crossognathus [Crossognathiformes]
- Crossostoma, Morris and Lycett 1851 [Ataphridae]
- Crossoura, Moberg and Segerberg 1906 [Trilobita]
- Crotalocephalides, Alberti 1967 [Phacopida]
- Crotalocephalina, Pibyl and Vanek 1964 [Cheiruridae]
- Crotalocephalus, Salter 1853 [Cheiruridae]
- Crotalocrinites, Austin 1842 [Cladida]
- Crownopora [Cryptostomata]
- Crozonorthis [Platyorthidae]
- Cruasiceras [Cephalopoda]
- Crucella, Pessagno 1971 [Hagiastridae]
- Crucibrissus [Hemiasteridae]
- Crucibulum, Schumacher 1817 [Calyptraeidae]
- Crucicornina [Podocopida]
- Cruciella [Bivalvia]
- Crucilobiceras [Eoderoceratidae]
- Cruciloculina [Hauerinidae]
- Crucimedusina [Hydroida]
- Crucispongia [Hexactinellida]
- Crucivirga [Holothuroidea]
- Crumillospongia, Rigby 1986 [Hazeliidae]
- Cruralina, Smirnova 1966 [Cancellothyrididae]
- Cruratula [Dielasmatidae]
- Crurirhynchia, Dagys 1961 [Erymnariidae]
- Crusoia [Ptychopariida]
- Crussoliceras [Cephalopoda]
- Crustoidea, order, Bulman 1970 [Graptolithina]
- Crustopora [Trepostomida]
- Crustuloides [Cardiida]
- Cruziturricula, Marks 1951 [Turridae]
- Cryphaeoides, Delo 1935 [Calmoniidae]
- Cryphina, Oehlert 1889 [Phacopida]
- Cryphiocrinus, Kirk 1929 [Cladida]
- Cryphops, R. Richter and E. Richter 1926 [Phacopidae]
- Cryptacanthia [Notothyrididae]
- Cryptamphorella, Dumitrica 1970 [Williriedellidae]
- Cryptangia, Milne-Edwards and Haime 1848 [Rhizangiidae]
- Cryptanisocrinus [Sagenocrinida]
- Cryptatrypa [Glassiidae]
- Cryptaulax [Cryptaulacidae]
- Cryptaulia, Pocta 1889 [Hippuritida]
- Cryptechinus [Temnopleuroida]
- Cryptobalistes [Tetraodontiformes]
- Cryptoberyx, Gaudant 1978 [Beryciformes]
- Cryptoblastus, R. Etherridge and P. H. Carpender 1886 [Spiraculata]
- Cryptoborsonia [Neogastropoda]
- Cryptobranchia [Archaeogastropoda]
- Cryptocapsa [Nassellaria]
- Cryptocardia, Palmer 1974 [Cardiidae]
- Cryptocaris, Schram 1974 [Tesnusocarididae]
- Cryptocephalus [Nassellaria]
- Cryptochiton, Middendorff 1847 [Acanthochitonidae]
- Cryptochorda, Mörch 1858 [Harpidae]
- Cryptoclymenia [Goniatitida]
- Cryptocoelia, Steinmann 1882 [Cryptocoeliidae]
- Cryptocoelopis [Cardiida]
- Cryptocoenia, d'Orbigny 1849 [Stylinidae]
- Cryptoconchus, Burrow 1815 [Acanthochitonidae]
- Cryptoconus, Koenen 1867 [Conidae]
- Cryptocordieria [Neogastropoda]
- Cryptocrinites, von Buch 1840 [Cryptocrinitidae]
- Cryptocycloceras [Orthocerida]
- Cryptoderaspis, Rasetti 1946 [Catillicephalidae]
- Cryptodictya [Reticulosa]
- Cryptoglena [Cyclostomata]
- Cryptoglytopleura [Palaeocopida]
- Cryptogoleus [Isorophida]
- Cryptograptus [Graptoloidea]
- Cryptolarancium [Spumellaria]
- Cryptolepas, Dall 1872 [Coronulidae]
- Cryptolepis [Coelacanthiformes]
- Cryptolichenaria, Sokolov 1955 [Cryptolichenariidae]
- Cryptolithoides, Whittington 1941 [Trinucleidae]
- Cryptolithus, Green 1832 [Trinucleidae]
- Cryptomactra, Andrussov 1902 [Mactridae]
- Cryptomella [Turridae]
- Cryptomya, Conrad 1848 [Myidae]
- Cryptonatica, Dall 1892 [Naticidae]
- Cryptonella [Cryptonellidae]
- Cryptonerita [Neritidae]
- Cryptopecten, Dall et al. 1938 [Pectinidae]
- Cryptophragmus, Raymond 1914 [Aulaceratidae]
- Cryptophyllus [Palaeocopida]
- Cryptoplax, Blainville 1818 [Acanthochitonidae]
- Cryptoplocus [Heterostrophia]
- Cryptopora [Nassellaria]
- Cryptopora, Jeffreys 1869 [Cryptoporidae]
- Cryptoptyxis, Cossmann 1906 [Procerithiidae]
- Cryptorhytis, Meek 1876 [Fasciolariidae]
- Cryptorthoceras, Flower 1939 [Spyroceratidae]
- Cryptoschisma, R. Etheridge and P. H. Carpenter 1886 [Fissiculata]
- Cryptoseptida [Ichthyolariidae]
- Cryptosiphon [Terebellomorpha]
- Cryptospira [Marginellidae]
- Cryptospirifer, Grabau 1931 [Athyrididae]
- Cryptostephanidium, Dumitrica 1978 [Eptingiidae]
- Cryptostomata, order, Vine 1884 [Stenolaemata]
- Cryptostomella [Lepraliellidae]
- Cryptosula, Canu and Bassler 1925 [Cryptosulidae]
- Cryptotaxis [Conodontophorida]
- Cryptothyris [Dalmanellidae]
- Cryptotreta, Pel'man 1977 [Cryptotretidae]
- Ctena, Mörch 1860 [Lucinidae]
- Ctenactis, Verrill 1864 [Fungiidae]
- Ctenaspis [Pteraspidomorphes]
- Cteniopleurium, Feldtmann 1951 [Pterioida]
- Ctenobactrites, Shimanskiy 1951 [Bactritidae]
- Ctenoberyx [Beryciformes]
- Ctenobolbina [Palaeocopida]
- Ctenobolbinella, Kummerow 1953 [Beyrichiidae]
- Ctenocardia, H. Adams and A. A 1857 [Cardiidae]
- Ctenocephalichthys, Gaudant 1969 [Beryciformes]
- Ctenocephalus, Hawle and Corda 1847 [Conocoryphidae]
- Ctenoceras, Noetling 1884 [Orthoceratinae]
- Ctenocheles, Kishinouye 1926 [Ctenochelidae]
- Ctenochonetes [Strophochonetidae]
- Ctenocolpus, Iredale 1924 [Turritellidae]
- Ctenoconularia [Scyphozoa]
- Ctenocrinus, Bronn 1840 [Monobathrida]
- Ctenodentex, Storms 1897 [Perciformes]
- Ctenodonta, Salter 1852 [Ctenodontidae]
- Ctenodontella, Khalfin 1940 [Malletiidae]
- Ctenognathodus, Fay 1959 [Kockelellidae]
- Ctenoides, Mörch 1853 [Limidae]
- Ctenoloculina [Palaeocopida]
- Ctenonotella [Palaeocopida]
- Ctenophora, phylum, Eschscholtz 1829 [Triploblastica]
- Ctenopomichthys, Whitley 1940 [Scorpaeniformes]
- Ctenopora [Cheilostomata]
- Ctenopterus [Eurypterida]
- Ctenopyge, Linnarsson 1880 [Olenidae]
- Ctenorbitoides [Foraminifera]
- Ctenosciaena, Fowler and Bean 1923 [Perciformes]
- Ctenoscolex [Phyllodocemorpha]
- Ctenostomata, order, Busk 1852 [Gymnolaemata]
- Ctenostreon, Eichwald 1862 [Limidae]
- Ctenothrissiformes, order, Patterson 1964 [Actinopteri]
- Ctenurella, Orvig 1960 [Ptyctodontida]
- Cterocardia [Cardiida]
- Cteroclymenia, Bogoslovsky 1979 [Rectoclymeniidae]
- Cualabaea [Coelacanthiformes]
- Cubacula [Echinoconchidae]
- Cubanina [Foraminifera]
- Cubanirhynchia, Kamyschan 1968 [Rhynchonellidae]
- Cubanothyris [Angustothyrididae]
- Cubaochetoceras [Oppeliidae]
- Cubestana, Bolten 1798 [Cymatiidae]
- Cubiceps, Lowe 1843 [Perciformes]
- Cubiculovinea [Serpulimorpha]
- Cubifenestella [Fenestrata]
- Cubitostrea, Sacco 1897 [Ostreidae]
- Cubitosulcus [Palaeocopida]
- Cubtosulcus [Palaeocopida]
- Cuburbita [Foraminifera]
- Cuccoceras, C. Diener 1905 [Balatonitidae]
- Cuctienophyllum [Anthozoa]
- Cucullaea, Lamarck 1801 [Cucullaeidae]
- Cucullaearca, Conrad 1865 [Arcidae]
- Cucullaria, Conrad 1869 [Parallelodontidae]
- Cucullipora [Hippoporinidae]
- Cucullograptus [Graptoloidea]
- Cudmorella [Terebratellidae]
- Cuersithyris [Lobothyrididae]
- Cuifastraea, Melnikova 1983 [Cuifastraeidae]
- Cuifia, Melnikova 1975 [Reimaniphylliidae]
- Culicia, Dana 1846 [Rhizangiidae]
- Culicocrinus, Muller 1855 [Monobathrida]
- Culmenaspis, Repina 1972 [Ptychopariida]
- Culmia [Neogastropoda]
- Culmicrinus, Jaekel 1918 [Cladida]
- Cultellus, Schumacher 1817 [Pharidae]
- Cultriopsis [Bakevelliidae]
- Culumbodina [Conodontophorida]
- Cumacea, order, Kroyer 1846 [Malacostraca]
- Cumberlandina [Acrospiriferidae]
- Cumberloceras, Ulrich et al. 1943 [Ellesmeroceratidae]
- Cumingia [Semelidae]
- Cumingsoceras, Flower 1950 [Uranoceratidae]
- Cummingella, F.R.C. Reed 1942 [Phillipsiidae]
- Cumminsia, Moore and Jeffords 1945 [Zaphrentoididae]
- Cumularia [Hippuritida]
- Cuna, Hedley 1902 [Condylocardiidae]
- Cunanax, Iredale 1936 [Condylocardiidae]
- Cunctocrinus, Kesling and Sigler 1969 [Calceocrinidae]
- Cuneamya, Hall and Whitfield 1875 [Grammysiidae]
- Cunearca, Dall 1898 [Arcidae]
- Cuneatopora [Cryptostomata]
- Cuneicardioceras [Cardioceratidae]
- Cuneigervillia, Cox 1954 [Bakevelliidae]
- Cuneoceratina [Bythocytheridae]
- Cuneocorbula, Cossmann 1886 [Corbulidae]
- Cuneocythere [Podocopida]
- Cuneolina [Cuneolinidae]
- Cuneolinella [Foraminifera]
- Cuneus [Foraminifera]
- Cuneus [Cardiida]
- Cunitoceras, Weyer 1972 [Prionoceratidae]
- Cunningtoniceras, Collignon 1937 [Acanthoceratidae]
- Cunnolites, Gagnebin 1772 [Cunnolitidae]
- Cuparius [Tetralobulidae]
- Cuphosolenus, Piette 1876 [Aporrhaidae]
- Cuphotifer, Piette 1876 [Aporrhaidae]
- Cupidoliva, Iredale 1924 [Olividae]
- Cupressocrinites, G.A. Goldfuss 1831 [Cupressocrinitidae]
- Cupuladria, Canu and Basler 1919 [Cupuladriidae]
- Cupularostrum, Sartenaer 1961 [Trigonirhynchiidae]
- Cupulina [Demospongea]
- Cupulocrinus, d'Orbigny 1849 [Cladida]
- Curetia [Heterostrophia]
- Curfsina [Podocopida]
- Curiaspis, Sdzuy 1955 [Trilobita]
- Curionia, Ronchetti and Allasinaz 1965 [Neoleptonidae]
- Curriella, Lamont 1978 [Encrinuridae]
- Cursina [Foraminifera]
- Curtastrum [Anthozoa]
- Curticia, Walcott 1905 [Curticiidae]
- Curtitheca [Orthothecida]
- Curtognathus [Conodontophorida]
- Curtohibolites [Belemnitida]
- Curvirostrum [Arcida]
- Curvitriordo [Isorophida]
- Curvostrea, Vialov 1936 [Ostreidae]
- Cusacrinus, Bowsher 1955 [Monobathrida]
- Cushmania [Foraminifera]
- Cushmanidea [Podocopida]
- Cushmanina, Jones 1984 [Ellipsolagenidae]
- Cuspidaria, Dall 1886 [Cuspidariidae]
- Cussetostrea [Pterioida]
- Cutchisphinctes [Cephalopoda]
- Cuvierina, Boas 1886 [Cavoliniidae]
- Cuvilliera [Cyclostomata]
- Cuvillierina [Foraminifera]
- Cuyanaspis, Rusconi 1953 [Trilobita]
- Cuyaniceras [Cephalopoda]
- Cyamidia [Fibulariidae]
- Cyamiomactra, Bernard 1897 [Cyamiidae]
- Cyamocarcinus, Bittner 1883 [Decapoda]
- Cyamocephalus [Planaterga]
- Cyamocytheridea [Podocopida]
- Cyamodus, H. von Meyer 1863 [Cyamodontidae]
- Cyanaphyllum [Anthozoa]
- Cyanocyclas [Cardiida]
- Cyanoplax, Pilsbry 1892 [Ischnochitonidae]
- Cyathactis, Soshkina 1955 [Ptychophyllidae]
- Cyathaspis [Pteraspididae]
- Cyathaxonella, Stuckenberg 1895 [Cyathaxoniidae]
- Cyathaxonia, Michelin 1847 [Cyathaxoniidae]
- Cyathelia, Milne-Edwards and Haime 1849 [Oculinidae]
- Cyathidium, Steenstrup 1846 [Cyrtocrinida]
- Cyathoceras, Moseley 1881 [Caryophylliidae]
- Cyathochitina [Rhizopodea]
- Cyathocidaris [Cidaridae]
- Cyathoclisia, Dingwall 1926 [Aulophyllidae]
- Cyathocoenia, Duncan 1867 [Pinacophyllidae]
- Cyathocricus [Ajacicyathida]
- Cyathocrinites, Miller 1821 [Cyathocrinitidae]
- Cyathocystis, Schmidt 1879 [Cyathocystidae]
- Cyathodictya [Reticulosa]
- Cyathodonta, Conrad 1849 [Thraciidae]
- Cyathopaedium, Schlüter 1889 [Pycnostylidae]
- Cyathophora, Michelin 1843 [Stylinidae]
- Cyathophycus, Walcott 1879 [Hintzespongiidae]
- Cyathophyllia, Fromentel 1865 [Montlivaltiidae]
- Cyathophylliopsis, Beauvais 1970 [Montlivaltiidae]
- Cyathophylloides, Dybowski 1873 [Stauriidae]
- Cyathophyllum, Goldfuss 1826 [Cyathophyllidae]
- Cyathophyscus [Porifera]
- Cyathoseris, Milne-Edwards and Haime 1849 [Agariciidae]
- Cyathosmilia, Tenison-Woods 1878 [Guyniidae]
- Cyathospongia [Demospongea]
- Cyathotheca, Jaekel 1927 [Cyathocystidae]
- Cyathotrochus, Bourne 1905 [Turbinoliidae]
- Cyathus [Aparchitidae]
- Cybantyx, Lane and Thomas 1978 [Styginidae]
- Cybele, Lovén 1845 [Encrinuridae]
- Cybeloides, Slocum 1913 [Encrinuridae]
- Cybelopsis, Poulsen 1927 [Pliomeridae]
- Cybelurus, Levitsky 1962 [Encrinuridae]
- Cycladicama, Valenciennes 1854 [Ungulinidae]
- Cycladigera [Linoporellidae]
- Cycladophora, Ehrenberg 1847 [Theopiliidae]
- Cyclammina, Brady 1876 [Lituolidae]
- Cyclampterium, Haeckel 1887 [Lophocyrtiidae]
- Cyclaster, Cotteau 1856 [Brissidae]
- Cyclastraea, Alloiteau 1952 [Fungiidae]
- Cyclastrum, Rüst 1898 [Angulobracchiidae]
- Cycledomia [Soritidae]
- Cycleryon, Glaessner 1965 [Eryonidae]
- Cyclicopora [Cyclicoporidae]
- Cyclina [Cardiida]
- Cyclindroclavulina [Foraminifera]
- Cyclindrocyathus, Alloiteau 1952 [Scleractinia]
- Cyclinella, Dall 1902 [Veneridae]
- Cyclinorbis, J. Makiyama 1926 [Cardiida]
- Cyclobacia [Micrabaciidae]
- Cyclobactrites, Shimanskiy 1955 [Bactritida]
- Cyclobatis, Egerton 1844 [Trygonidae]
- Cyclocancer, Beurlen 1958 [Cancridae]
- Cyclocardia, Conrad 1867 [Carditidae]
- Cycloceltites, E. v. Mojsisovics 1893 [Cycloceltitidae]
- Cycloceras, M'Coy 1844 [Orthocerida]
- Cyclochlamys, Finlay 1926 [Propeamussiidae]
- Cyclocites [Cyclostomata]
- Cycloclymenia, J. J. Sepkoski 2002 [Phenacoceratidae]
- Cycloclypeus [Nummulitidae]
- Cyclocoelia [Cyclocoeliidae]
- Cyclocolposa [Bryocryptellidae]
- Cycloconcha [Cycloconchidae]
- Cyclocrinus, d'Orbigny 1850 [Cyclocrinidae]
- Cyclocyathella [Ajacicyathida]
- Cyclocyrtendoceras, Balashov 1961 [Cyrtendoceratidae]
- Cyclodostomia [Heterostrophia]
- Cycloes, De Haan 1837 [Calappidae]
- Cycloflabellum, Chevalier 1961 [Flabellidae]
- Cycloforina, Luczkowska 1972 [Hauerinidae]
- Cyclogeorgina [Problematica]
- Cyclognathina, Lermontova 1951 [Ptychopariida]
- Cyclograptus [Tuboidea]
- Cyclolampas [Collyritidae]
- Cyclolberis [Myodocopida]
- Cyclolenzellina [Trilobita]
- Cyclolina [Foraminifera]
- Cyclolites, Lamarck 1801 [Cunnolitidae]
- Cyclolitopsis, Reuss 1873 [Cyclolitidae]
- Cyclolituites, Remelé 1886 [Lituitidae]
- Cyclolobus, Waagen 1879 [Cyclolobidae]
- Cycloloculina [Foraminifera]
- Cyclolorenzella, Kobayashi 1960 [Diceratocephalidae]
- Cyclomactra [Cardiida]
- Cyclomedusa, Sprigg 1947 [Cnidaria]
- Cyclomolops, Gabb 1868 [Rostellariidae]
- Cyclomyonia [Paurorthidae]
- Cyclope, Risso 1826 [Nassariidae]
- Cyclopecten, Verrill 1897 [Propeamussiidae]
- Cyclopellatia, Cossmann 1907 [Lucinidae]
- Cyclopelta [Fenestrata]
- Cycloperiella [Stomachetosellidae]
- Cyclophaenopora [Stenolaemata]
- Cyclophyllia, Milne-Edwards and Haime 1848 [Cyclolitidae]
- Cyclophyllopsis, Alloiteau 1951 [Cyclophyllopsiidae]
- Cyclopites, Zhuravleva 1962 [Polyelasmoceratidae]
- Cyclopites, Raasch 1952 [Aglaspididae]
- Cycloplectoceras, Ulrich et al. 1942 [Tarphyceratidae]
- Cyclopora [Trepostomida]
- Cycloporella [Trepostomida]
- Cycloporidium [Sphaeractinida]
- Cycloprosopon, E. Lorenthey and K. Beurlen 1929 [Goniodromitidae]
- Cyclopseudedomia [Rhapydioninidae]
- Cyclopsinella [Foraminifera]
- Cycloptychius, Young 1866 [Palaeoniscidae]
- Cycloputeolina [Soritidae]
- Cyclopyge, Hawle and Corda 1847 [Cyclopygidae]
- Cyclorbiculina [Soritidae]
- Cyclorbiculinoides [Soritidae]
- Cyclorbitopsella [Foraminifera]
- Cyclorhynchia [Cyclospiridae]
- Cyclorisma, Dall 1902 [Veneridae]
- Cyclorismina, Marwick 1927 [Veneridae]
- Cycloscala, Dall 1889 [Epitoniidae]
- Cycloseris, Milne-Edwards and Haime 1849 [Fungiidae]
- Cycloserpula, K.O.A. Parsch 1956 [Serpulimorpha]
- Cyclosphaeroma, H. Woodward 1890 [Isopoda]
- Cyclospira, Hall and Clarke 1893 [Cyclospiridae]
- Cyclospongia, Miller 1891 [Archaeogastropoda]
- Cyclostomaria, Szabo 1980 [Archaeogastropoda]
- Cyclostomata, order, Busk 1852 [Stenolaemata]
- Cyclostomiceras, Hyatt 1900 [Cyclostomiceratidae]
- Cyclostrema, Marryatt 1818 [Liotiidae]
- Cyclostremela [Archaeogastropoda]
- Cyclostremella, Tate 1898 [Gastropoda]
- Cyclostremiscus, Pilsbry and Olsson 1945 [Vitrinellidae]
- Cyclostromella (Tate 1898) [Vitrinellidae]
- Cyclosunneta [Cardiida]
- Cyclotellina, Cossmann 1886 [Tellinidae]
- Cyclothone, Goode and Bean 1883 [Gonostomatidae]
- Cyclothyca [Amathinidae]
- Cyclothyreus, M. Remes 1895 [Goniodromitidae]
- Cyclothyris, M'Coy 1844 [Cyclothyrididae]
- Cyclotrypa [Fistuliporidae]
- Cycloturbo [Archaeogastropoda]
- Cycloxanthops, Rathbun 1897 [Xanthidae]
- Cyclozoa, class [Cnidaria]
- Cyclus, de Koninck 1841 [Cyclidae]
- Cydimia [Meganterididae]
- Cydonocrinus, Bather 1913 [Codiacrinidae]
- Cydrocrinus, Kirk 1940 [Cladida]
- Cylichna, Lovén 1846 [Cylichnidae]
- Cylichnania, Marwick 1931 [Cylichnidae]
- Cylichnatys, Kuroda & Habe 1952 [Cephalaspida]
- Cylichnella, Gabb 1873 [Cylichnidae]
- Cylichnina, Monterasato 1884 [Retusidae]
- Cylichnopsis, Cossmann 1904 [Cephalaspida]
- Cylicoceras, Buckman 1899 [Graphoceratidae]
- Cylicocrinus, Miller 1892 [Monobathrida]
- Cylicoopsis [Axinellida]
- Cylinder [Neogastropoda]
- Cylindracanthus, Leidy 1856 [Dercetidae]
- Cylindriscala, de Boury 1912 [Epitoniidae]
- Cylindritella, White 1887 [Cephalaspida]
- Cylindrites, Gesner 1758 [Cylindrobullinidae]
- Cylindrochitina [Rhizopodea]
- Cylindroclavulina [Foraminifera]
- Cylindrocolaniella [Foraminifera]
- Cylindromitra [Neogastropoda]
- Cylindrophyllum, Simpson 1900 [Eridophyllidae]
- Cylindrophyma, Zittel 1878 [Cylindrophymatidae]
- Cylindropora [Cyclostomata]
- Cylindrosmilia [Scleractinia]
- Cylindrostylus, Sokolov 1955 [Multithecoporidae]
- Cylindroteuthis [Belemnitida]
- Cylindrotheca [Rhabdopleurida]
- Cylindrotrocholina [Foraminifera]
- Cylindrotruncatum, N. F. Sohl 1963 [Acteocinidae]
- Cyliocrinus, Jaekel 1918 [Cladida]
- Cyllene, Gray 1834 [Nassariidae]
- Cyllenina, Bellardi 1882 [Nassariidae]
- Cymabolbina [Palaeocopida]
- Cymaceras [Oppeliidae]
- Cymaclymenia, Hyatt 1884 [Cymaclymeniidae]
- Cymahoplites [Cleoniceratidae]
- Cymakra [Neogastropoda]
- Cymatelasma, Hill and Butler 1936 [Ptenophyllidae]
- Cymatella, Sytova 1970 [Ptenophyllidae]
- Cymatiella, Iredale 1924 [Ranellidae]
- Cymatium, Röding 1798 [Ranellidae]
- Cymatodus, Newberry and Worthen 1870 [Janassidae]
- Cymatoga [Isopoda]
- Cymatogaster, Gibbons 1854 [Perciformes]
- Cymatograptus [Dendroidea]
- Cymatoica, Dall 1889 [Tellinidae]
- Cymatonautilus, Spath 1927 [Cymatoceratidae]
- Cymatonota, Ulrich 1893 [Modiomorphidae]
- Cymatophos, Pilsbry and Olsson 1941 [Buccinidae]
- Cymatosaurus, Fritsch 1894 [Eosauropterygia]
- Cymatosyrinx, Dall 1889 [Turridae]
- Cymbalopora [Foraminifera]
- Cymbaloporella [Foraminifera]
- Cymbaloporetta, Cushman 1928 [Cymbaloporidae]
- Cymbidium, Kirk 1926 [Subrianidae]
- Cymbiocrinus, Kirk 1944 [Ampelocrinidae]
- Cymbiola, Swainson 1831 [Volutidae]
- Cymbionites [Eocrinoidea]
- Cymbistropheodonta [Strophodontidae]
- Cymbites, Neumayr 1878 [Cymbitidae]
- Cymbithyris [Billingsellidae]
- Cymbium [Volutidae]
- Cymbochlaenia [Demospongea]
- Cymbophora, Gabb 1869 [Mactridae]
- Cymbospondylus, Leidy 1868 [Cymbospondylidae]
- Cymella, Meek 1864 [Poromyidae]
- Cymenorhytis, Cossmann 1988 [Planaxidae]
- Cymia, Mörch 1860 [Muricidae]
- Cymoceras, McCaleb 1964 [Neodimorphoceratidae]
- Cymodoce [Isopoda]
- Cymoproductus [Productellidae]
- Cymosmilia, Koby 1894 [Rhipidogyridae]
- Cymostrophia, Caster 1939 [Douvillinidae]
- Cynisca, H. Adams and A. Adams 1854 [Turbinidae]
- Cyniscella, Cossmann 1918 [Ataphridae]
- Cynopodius, Traquair 1881 [Chondrichthyes]
- Cynoscion, Gill 1861 [Sciaenidae]
- Cypellia, Pomel 1872 [Cypelliidae]
- Cypelometra [Comatulida]
- Cyphaspides, Novak 1890 [Aulacopleuridae]
- Cyphaspis, H. Burmeister 1843 [Aulacopleuridae]
- Cyphinioides, Reed 1942 [Proetidae]
- Cyphocrinus, Miller 1892 [Diplobathrida]
- Cyphonella [Porinidae]
- Cyphoniscus, Salter 1853 [Isocolidae]
- Cyphonochelus, Jousseaume 1882 [Muricidae]
- Cyphoproetus, Kegel 1927 [Proetidae]
- Cyphoterorhynchus [Trigonirhynchiidae]
- Cyphotrypa, Ulrich and Bassler 1904 [Atactotoechidae]
- Cypraea (Bernayia) (Jousseaume 1884) [Cypraeidae]
- Cypraea (Mauritia), Troschel 1863 [Cypraeidae]
- Cypraea (Notocypraea) (Schilder 1927) [Cypraeidae]
- Cypraecassis, Stuchburry 1837 [Cassidae]
- Cypraedia, Swainson 1840 [Pediculariidae]
- Cypraeerato, Schilder 1932 [Triviidae]
- Cypraeogemmula, Vredenburg 1920 [Pediculariidae]
- Cypraeopsis, Schilder 1936 [Cypraeidae]
- Cyprella [Myodocopida]
- Cyprideis, T. R. Jones 1857 [Podocopida]
- Cypridella [Myodocopida]
- Cypridellina [Myodocopida]
- Cypridina [Cypridinidae]
- Cypridinella [Myodocopida]
- Cypridodella [Conodontophorida]
- Cypridopsis [Podocopida]
- Cyprilepas [Cirripedia]
- Cyprimeria, Conrad 1864 [Veneridae]
- Cyproglobina, De Gregorio 1880 [Pediculariidae]
- Cyprosina [Myodocopida]
- Cyprosis [Myodocopida]
- Cyptendoceras, Ulrich and Foerste 1936 [Baltoceratidae]
- Cyptoporocyathus [Capsulocyathida]
- Cyranichthys [Alepisauriformes]
- Cyrbasia [Cerithiopsidae]
- Cyrbasiotreta [Siphonotretidae]
- Cyrenobatissa [Cardiida]
- Cyrenodonax, Dall 1903 [Corbiculidae]
- Cyrenopsis [Cardiida]
- Cyrtactinoceras, Hyatt in Zittel 1900 [Proteoceratidae]
- Cyrtella, Fredericks 1924 [Syringothyrididae]
- Cyrtendoceras, Remelé 1886 [Cyrtendoceratidae]
- Cyrtentactinia, Foreman 1963 [Popofskyellidae]
- Cyrthoceratites, d'Archiac and deVerneuil 1842 [Nothoceratidae]
- Cyrtia, Dalman 1828 [Cyrtiidae]
- Cyrtina, Davidson 1858 [Cyrtinidae]
- Cyrtinaella [Cyrtinidae]
- Cyrtinoides [Ambocoeliidae]
- Cyrtinopsis [Cyrtinopsidae]
- Cyrtiopsis [Cyrtospiriferidae]
- Cyrtiorina [Ulbospiriferidae]
- Cyrtiphaeronemium [Spumellaria]
- Cyrtisphaeractenium, Deflandre 1972 [Archocyrtiidae]
- Cyrtobactrites, Erben 1960 [Bactritidae]
- Cyrtobaltoceras, R. H. Flower 1964 [Baltoceratidae]
- Cyrtobolia, Pocta 1883 [Cystispongiidae]
- Cyrtocalpis [Nassellaria]
- Cyrtocapsa, Haeckel 1881 [Eucyrtidiidae]
- Cyrtocapsella [Nassellaria]
- Cyrtocapsella, Haeckel 1887 [Eucyrtidiidae]
- Cyrtoceras [Cephalopoda]
- Cyrtoceratites, Goldfuss 1830 [Archiacoceratidae]
- Cyrtocerina, Billings 1865 [Cyrtocerinidae]
- Cyrtocheilus, Shimanskiy 1962 [Polyelasmoceratidae]
- Cyrtochetus, Cossmann 1899 [Buccinidae]
- Cyrtochilus, Meek 1876 [Baculitidae]
- Cyrtochites [Problematica]
- Cyrtoclymenia, Hyatt 1884 [Cyrtoclymeniidae]
- Cyrtocrinida, order [Cladida]
- Cyrtocrinus, Jeakel 1892 [Cyrtocrinida]
- Cyrtocyprus [Metacopida]
- Cyrtodaria, Reuss 1801 [Hiatellidae]
- Cyrtodechenella, Richter 1950 [Proetidae]
- Cyrtogomphoceras, Foerste 1924 [Cyrtogomphoceratidae]
- Cyrtogomphus, Flower 1938 [Poterioceratidae]
- Cyrtograptus [Graptoloidea]
- Cyrtometopus, Angelin 1854 [Cheiruridae]
- Cyrtoniscus [Anopliidae]
- Cyrtonotella, Schuchert and Cooper 1931 [Archaeorthidae]
- Cyrtonotreta, Holmer 1989 [Acrotretidae]
- Cyrtonowakia, Alberti 1986 [Procorniculinidae]
- Cyrtonybyoceras, Teichert 1933 [Armenoceratidae]
- Cyrtophyllum, Lindström 1882 [Cyrtophyllidae]
- Cyrtopinna, Mörch 1853 [Pinnidae]
- Cyrtopleura, Tryon 1862 [Pholadidae]
- Cyrtopleurites, E. v. Mojsisovics 1893 [Tibetitidae]
- Cyrtopora [Cyclostomata]
- Cyrtoproetus, F.R.C. Reed 1943 [Proetidae]
- Cyrtoprora, A. A. Opik 1967 [Odontopleurida]
- Cyrtorhina, T. Monod 1956 [Raninidae]
- Cyrtorizoceras, Hyatt 1900 [Oncoceratidae]
- Cyrtorostra [Deltopectinidae]
- Cyrtosiceras, Hyatt 1900 [Oppeliidae]
- Cyrtospirifer, Nalivkin 1924 [Cyrtospiriferidae]
- Cyrtospyroceras, Flower 1938 [Spyroceratidae]
- Cyrtosteus, Gross 1932 [Arthrodira]
- Cyrtosymbole, Richter 1913 [Proetidae]
- Cyrtosymboloides, Alberti 1967 [Tropidocoryphidae]
- Cyrtothoracoceras, Turner 1964 [Spyroceratidae]
- Cyrtovaginoceras, Kobayashi 1934 [Cyrtendoceratidae]
- Cystacythereis [Podocopida]
- Cystammina, Neumayer 1889 [Ammosphaeroidinidae]
- Cystaster, Hall 1871 [Hemicystitidae]
- Cystelasma, Miller 1891 [Pentaphyllidae]
- Cysticamara [Camaroidea]
- Cysticyathus [Anthozoa]
- Cystihalysites, Chernyshev 1941 [Halysitidae]
- Cystihexagonaria [Anthozoa]
- Cystilophophyllum, Fomichev 1953 [Aulophyllidae]
- Cystipaliphyllum, Lavrusevich 1964 [Paliphyllidae]
- Cystiphorolites, Miller 1889 [Holmophyllidae]
- Cystiphylloides (Cladionophyllum), Stumm 1961 [Cystiphyllidae]
- Cystiphylloides (Comanaphyllum), Flügel 1961 [Cystiphyllidae]
- Cystiphylloides (Lythophyllum), Wedekind 1925 [Cystiphyllidae]
- Cystiphylloides (Skoliophyllum), Wedekind 1937 [Cystiphyllidae]
- Cystiphyllum, Lonsdale 1839 [Cystiphyllidae]
- Cystiphyllum (Cruciphyllum), Lavrusevich 1976 [Cystiphyllidae]
- Cystiphyllum (Cysticonophyllum), Zaprudskaya and Ivanovskiy 1962 [Cystiphyllidae]
- Cystiphyllum (Gyalophyllum), Wedekind 1927 [Cystiphyllidae]
- Cystiphyllum (Gyaloplasma), Zhavoronkova 1976 [Cystiphyllidae]
- Cystiphyllum (Hedstroemophyllum), Wedekind 1927 [Cystiphyllidae]
- Cystiphyllum (Zonophyllum), Wedekind 1924 [Cystiphyllidae]
- Cystiramus [Cystoporata]
- Cystisella [Bryocryptellidae]
- Cystispina, R. Richter and E. Richter 1939 [Proetidae]
- Cystispongia, Roemer 1864 [Cystispongiidae]
- Cystistroma, Etheridge 1895 [Stromatoceriidae]
- Cystitrypa [Cystoporata]
- Cystitrypanopora, Jia 1955 [Aulocystidae]
- Cystoblastus [Rhombifera]
- Cystocantrilla [Anthozoa]
- Cystocerium, Nestor 1976 [Stromatoceriidae]
- Cystodendropora, Lin 1962 [Micheliniidae]
- Cystodictya, Ulrich 1882 [Cystodictyonidae]
- Cystodytes [Tunicata]
- Cystograptus [Graptoloidea]
- Cystolonsdaleia, Fomichev 1953 [Petalaxidae]
- Cystolyrielasma [Anthozoa]
- Cystomatochilina [Palaeocopida]
- Cystophora, Nilsson 1820 [Phocidae]
- Cystophrentis, Yü 1931 [Uraliniidae]
- Cystoporata, order, Astrova 1964 [Stenolaemata]
- Cystoporella [Cyclostomata]
- Cystostictoporus [Rhinidictyidae]
- Cystostroma, Galloway and St Jean 1957 [Rosenellidae]
- Cystothalamiella [Aphrosalpingidae]
- Cythara, Schumacher 1817 [Turridae]
- Cytharella, Monterosato 1875 [Turridae]
- Cytheralison [Podocopida]
- Cythere, O. F. Müller 1785 [Cytheridae]
- Cytherea (Transennella), Dall 1884 [Veneridae]
- Cythereis, Jones 1849 [Cytheridae]
- Cytherella, Jones 1849 [Cytherellidae]
- Cytherellina [Bairdiocyprididae]
- Cytherelloidea, Alexander 1929 [Cytherellidae]
- Cytheretta [Podocopida]
- Cytheridea, J. Bosquet 1852 [Cytherideidae]
- Cytheridella [Podocopida]
- Cytheriopsis, Conrad 1865 [Veneridae]
- Cytherocardia [Cardiida]
- Cytherodon [Trigoniida]
- Cytherois [Podocopida]
- Cytheroma [Podocopida]
- Cytheromorpha, Hirschmann 1909 [Cytheridae]
- Cytheropterina [Podocopida]
- Cytheropteron, Sars 1866 [Cytheruridae]
- Cytherura [Podocopida]
- Cytidocrinus, Kirk 1944 [Monobathrida]
- Cytis [Cyclostomata]
- Cytocrinus, Roemer 1860 [Monobathrida]
- Cyttarocrinus, Goldring 1923 [Monobathrida]
- Cyttaroplasma [Anthozoa]
- Cyttoides, Wettstein 1886 [Zeiformes]
- Czarnockia, Rozkowska 1969 [Laccophyllidae]
- Czekanowskites, C. Diener 1915 [Longobarditidae]
- Dabashanella, Huo et al 1983 [Archaeocopida]
- Dabashanites [Siphogonuchitidae]
- Dabashanospira [Atrypinidae]
- Dacicardium [Cardiida]
- Dacrydium, Torell 1859 [Mytilidae]
- Dacryoconarida, order, Fisher 1962 [Tentaculita]
- Dacryonella [Cheilostomata]
- Dacryopora [Cyclostomata]
- Dacryoporella [Cheilostomata]
- Dactylaraea, d'Orbigny 1849 [Microsolenidae]
- Dactylioceras [Dactylioceratidae]
- Dactyliosphaera, Squinabol 1904 [Dactyliosphaeridae]
- Dactylocalycites [Demospongea]
- Dactylocalyx [Lychniscosa]
- Dactylocephalus, Hsu 1948 [Hungaiidae]
- Dactylocoenia, d'Orbigny 1849 [Thamnasteriidae]
- Dactylocrinus [Sagenocrinida]
- Dactylocystis [Diploporita]
- Dactylogonia, Ulrich and Cooper 1942 [Strophomenidae]
- Dactylopogon, Marck 1868 [Actinopterygii]
- Dactyloptena [Dactylopteriformes]
- Dactylopteriformes, order [Actinopteri]
- Dactylopterus [Dactylopteridae]
- Dactylosaurus, Gürich 1884 [Eosauropterygia]
- Dactylosmilia, d'Orbigny 1849 [Faviidae]
- Dactyloteuthis [Megateuthididae]
- Dactylotreta, Rowell and Henderson 1978 [Acrotretidae]
- Dadocrinus [Millericrinida]
- Daedalichthys, Brough 1931 [Palaeonisciformes]
- Daedalocrinus, Ulrich 1924 [Homocrinidae]
- Dagmaraephyllum, Rogozov 1962 [Cyathopsidae]
- Dagmarella [Foraminifera]
- Dagmarita [Biseriamminidae]
- Dagnachonetes [Chonetidae]
- Dagnoceras, G. v. Arthaber 1911 [Dinaritidae]
- Daguinaspis, Hupe and Abadie 1950 [Fallotaspididae]
- Dagysorhynchia [Basiliolidae]
- Dahaiella, Jiang 1982 [Archaeocopida]
- Daharina [Cardiida]
- Dahomeya [Podocopida]
- Daihuaia, Yuan 1988 [Proetida]
- Dailyatia, Bischoff 1976 [Kennardiidae]
- Dailycyathus [Ajacicyathida]
- Dainella [Foraminifera]
- Dainita [Foraminifera]
- Dainitella [Foraminifera]
- Daira, De Haan 1833 [Decapoda]
- Daitingichthys, Arratia 1987 [Clupeiformes]
- Daixina, Rozovskaya 1949 [Schwagerinidae]
- Daixites, Ruzhencev 1941 [Medlicottiidae]
- Dakaria [Schizoporellidae]
- Dakeoceras, Ulrich and Foerste 1931 [Ellesmeroceratidae]
- Dakosaurus, F. A. Quenstedt 1856 [Metriorhynchidae]
- Dala, Muller 1983 [Brachypoda]
- Dalatias, Rafinesque 1810 [Squalidae]
- Dalecarlioceras, Frye 1987 [Oncoceratidae]
- Daleiella [Podocopida]
- Dalejeproetus, Snajdr 1977 [Tropidocoryphidae]
- Dalejina, Havlicek 1953 [Rhipidomellidae]
- Dalejocystis [Soluta]
- Dalejodiscus [Sowerbyellidae]
- Dalelina, Sun 1978 [Leperditicopida]
- Dalerhynchus [Trigonirhynchiidae]
- Dalinuria [Productellidae]
- Daljanolites, Leleshus 1964 [Pachyporidae]
- Dalliella, Cossmann 1895 [Litiopidae]
- Dalligas [Laqueidae]
- Dallina, Beecher 1893 [Dallinidae]
- Dallinella [Terebrataliidae]
- Dallitesta, Mansfield 1930 [Naticidae]
- Dallithyris [Terebratulidae]
- Dallocardia, Stewart 1930 [Cardiidae]
- Dallonella [Podocopida]
- Dalmanella, J. Hall and J. M. Clarke 1892 [Dalmanellidae]
- Dalmanellopsis [Draboviidae]
- Dalmaniopsis [Arthropoda]
- Dalmanites, Barrande 1852 [Dalmanitidae]
- Dalmanitina, Reed 1905 [Dalmanitidae]
- Dalmaniturus, Chernysheva 1937 [Phacopida]
- Dalmanophyllum, Lang and Smith 1939 [Streptelasmatidae]
- Dalmasiceras [Himalayitidae]
- Dalmatichthys, Radovcic 1975 [Polymixiiformes]
- Dalmatites [Proptychitidae]
- Dalnia, Fedorowski 1973 [Pentaphyllidae]
- Dalpiaziella, Cadrobbi 1962 [Paranguillidae]
- Damaiaoaspis [Ptychopariida]
- Damalichthys, Girard 1855 [Perciformes]
- Damaoella [Ostracoda]
- Damesella, Walcott 1905 [Damesellidae]
- Damesia [Gastropoda]
- Damesiceras [Cephalopoda]
- Damesites, Matsumoto 1942 [Desmoceratidae]
- Damiriella [Palaeocopida]
- Damonella [Podocopida]
- Dampietrigonia [Trigoniida]
- Dananzhuangaspis, Lin 1983 [Ptychopariida]
- Danaoceras, Foerste 1926 [Polyelasmoceratidae]
- Danaphos, Bruun 1931 [Stomiatiformes]
- Danatinia, Daniltshenko 1968 [Lampridiformes]
- Dandya, White and Moy-Thomas 1941 [Semionotidae]
- Danella [Thecideidae]
- Dannevigia, Whitley 1941 [Ophidiiformes]
- Danoceras, Troedsson 1926 [Diestoceratidae]
- Danubiella [Hauerinidae]
- Danubisphinctes [Ataxioceratidae]
- Danubites, E. v. Mojsisovics 1893 [Danubitidae]
- Danzania [Ingelarellidae]
- Danzikoceras [Nautilida]
- Daonella [Halobiidae]
- Dapalis, Gistl 1848 [Serranidae]
- Dapaloides, Gaudant 1985 [Perciformes]
- Dapedium, Leach 1822 [Semionotiformes]
- Daphnella, Hinds 1844 [Turridae]
- Daphnites, E. v. Mojsisovics 1893 [Parathisbitidae]
- Daphnobela [Fasciolariidae]
- Daradaster [Pliolampadidae]
- Daranyia, Lorenthey 1901 [Decapoda]
- Darbya, Bartsch 1934 [Turridae]
- Dardanula, Iredale 1915 [Eatoniellidae]
- Dardanus, O. Paulson 1875 [Paguridae]
- Darellia [Graphoceratidae]
- Darendeella, Karacabey-Oztemür 1976 [Radiolitidae]
- Dariellina [Foraminifera]
- Dariopsidae, family [Foraminifera]
- Darjella [Foraminifera]
- Darmuthia [Cephalaspidiformes]
- Daronia, A. Adams 1861 [Adeorbidae]
- Darteplicatula [Pterioida]
- Dartoceras, Foerste 1936 [Cephalopoda]
- Dartonaspis, Miller 1936 [Elviniidae]
- Dartonoceras [Endocerida]
- Darvasites [Schwagerinidae]
- Darwasophyllum, Pyzhyanov 1964 [Geyerophyllidae]
- Dasbergoceras [Nautilida]
- Dasciocrinus, Kirk 1939 [Cladida]
- Dasmia, Milne-Edwards and Haime 1848 [Caryophylliidae]
- Dasmiopsis, Oppenheim 1930 [Caryophylliidae]
- Dasmosmilia, Pourtalès 1880 [Caryophylliidae]
- Dasometopus, Resser 1936 [Holocephalinidae]
- Dastilbe, Jordan 1910 [Gonorhynchiformes]
- Dasyatis, Rafinesque 1810 [Dasyatidae]
- Dasyceras [Phylloceratitida]
- Dasyconus [Hydroconozoa]
- Datangia [Monticuliferidae]
- Datta [Pterioida]
- Daucina [Foraminifera]
- Daucinoides [Nodosariidae]
- Davanirhynchia [Rhynchonellidae]
- Davichthys, Forey 1973 [Elopiformes]
- Davidsonella, Munier-Chalmas 1881 [Bactryniidae]
- Davidsonia, Bouchard-Chantereaux 1849 [Davidsoniidae]
- Davidsoniatrypa [Carinatinidae]
- Daviesiconus [Foraminifera]
- Daviesiella [Daviesiellidae]
- Daviesina [Lepitorbitoididae]
- Davoustia [Eodevonariidae]
- Dawania [Palaeocopida]
- Dawsonelloides [Strophochonetidae]
- Dawsonia, C.F. Hartt 1868 [Eodiscidae]
- Dawsonocerina, Horny 1956 [Dawsonoceratidae]
- Daxia [Mayncinidae]
- Dayia, Davidson 1881 [Dayiidae]
- Dayiceras [Polymorphitidae]
- Daytonia, Holloway 1981 [Dalmanitidae]
- Dazhucrinus, Mu and Wu 1974 [Crinoidea]
- Deadwoodia, Resser 1938 [Dokimocephalidae]
- Deanaspis, Hughes et al. 1975 [Trinucleidae]
- Deania, Jordan and Snyder 1902 [Centrophoridae]
- Dearbornia [Acrothelidae]
- Debarina [Haplophragmoididae]
- Debnikiella [Anthozoa]
- Decacystis [Homostelea]
- Decadocrinus, Wachsmuth and Springer 1879 [Poteriocrinidae]
- Decaheliocoenia [Scleractinia]
- Decameros, Orbigny 1850 [Comatulida]
- Decaphyllum, Frech 1885 [Anthozoa]
- Decapterus, Bleeker 1850 [Carangidae]
- Decaschisma, Fay 1961 [Phaenoschismatidae]
- Decatopecten, Sowerby 1839 [Pectinidae]
- Decazella, Heyler 1967 [Palaeonisciformes]
- Dechaseauxia [Hippuritida]
- Dechenella, Kayser 1880 [Proetidae]
- Dechenellurus, Maksimova 1960 [Proetida]
- Decipia [Cephalopoda]
- Decipilites [Hyolithida]
- Decipula [Cardiida]
- Deckera, Frederickson 1949 [Dokimocephalidae]
- Deckerella [Palaeotextulariidae]
- Deckerellina [Foraminifera]
- Deckeroceras, Foerste 1935 [Apsidoceratidae]
- Declivolithus, Pribyl and Vanek 1967 [Trinucleidae]
- Decorella [Palaeocopida]
- Decorites, Ruzhencev and Bogoslovskaya 1975 [Homoceratidae]
- Decoritheca, Syssoiev 1968 [Novitatidae]
- Decoroproetus, Pribyl 1946 [Proetidae]
- Decoropugnax [Innaechiidae]
- Decoroscutellum, Snajdr 1958 [Styginidae]
- Decurella [Cyclostomata]
- Decurtaria [Cheilostomata]
- Decurtella, Gaetani 1966 [Austrirhynchidae]
- Decus, Pegel 1981 [Ptychopariida]
- Dedzetina [Dalmanellidae]
- Deefgella [Palaeocopida]
- Deflandrella, Loeblich and Tappan 1961 [Spumellaria]
- Deflandrellium, Cheng 1986 [Archocyrtiidae]
- Defrancia, Alloiteau 1957 [Faviidae]
- Defrancia [Frondiporidae]
- Defranciopora [Cyclostomata]
- Degamella, Marek 1961 [Cyclopygidae]
- Degeletticyathus [Ajacicyathida]
- Degrangia [Myoida]
- Dehmicystis [Soluta]
- Dehornella, Lecompte 1952 [Milleporellidae]
- Deianira, Stolickza 1860 [Deianiridae]
- Deiloceras [Discosorida]
- Deinoceras [Discosorida]
- Deiphon, Barrande 1846 [Cheiruridae]
- Deiracephalus, Resser 1935 [Llanoaspididae]
- Deiracorallium, Nelson 1963 [Streptelasmatidae]
- Deiradovclavus, Conway Morris and Chen 1990 [Zhijinitidae]
- Deiroceras, A. Hyatt 1884 [Ormoceratidae]
- Deirosaurus, Owen 1854 [Nothosauridae]
- Deirosteus, Wells 1942 [Arthrodira]
- Dekayella, Ulrich 1882 [Heterotrypidae]
- Dekayia, Milne-Edwards and Haime 1851 [Heterotrypidae]
- Delagnostus, Opik 1961 [Agnostida]
- Delaria, Weller 1944 [Phillipsiidae]
- Delecticeras [Cephalopoda]
- Delectopecten, Stewart 1930 [Pectinidae]
- Delepinea [Rugosochonetidae]
- Delepinoceras, Miller and Furnish 1954 [Delepinoceratidae]
- Delgadella, Walcott 1908 [Hebediscidae]
- Delheidia [Hydrozoa]
- Delia [Bivalvia]
- Dellea, Wilson 1949 [Dokimocephalidae]
- Delleana, Ivshin 1962 [Ptychopariida]
- Delocare, Struve 1958 [Phacopida]
- Delocidaris [Cidaroida]
- Delocrinus, Miller and Gurley 1890 [Catacrinidae]
- Deloia [Palaeocopida]
- Delops, Rickards 1965 [Dalmanitidae]
- Delosia, Gailite 1967 [Palaeocopida]
- Delosites [Eunicemorpha]
- Delphinites, Sayn 1901 [Neocomitidae]
- Delphinosaurus, Merriam 1905 [Californosauridae]
- Delphinulopsis, Laube 1868 [Delphinulopsidae]
- Deltacare, Harrington and Leanza 1957 [Trilobita]
- Deltacephalaspis, Eldredge and Ormiston 1979 [Calmoniidae]
- Deltaclavus, Conway Morris and Chen 1990 [Zhijinitidae]
- Deltacoleus, Withers 1926 [Turrilepadida]
- Deltacrinus, Ulrich 1886 [Crinoidea]
- Deltadechenella, Ormiston 1967 [Proetidae]
- Deltadiscus [Isorophida]
- Deltamya, Burmester 2004 [Pholadomyidae]
- Deltentosteus, Gill 1863 [Perciformes]
- Delthyris, Dalman 1828 [Delthyrididae]
- Deltina, Sunbe 1994 [Ptychopariidae]
- Deltoblastus, R. O. Fay 1961 [Schizoblastidae]
- Deltocyathus, Milne-Edwards and Haime 1848 [Caryophylliidae]
- Deltodus, Morris and Roberts 1862 [Cochliodontidae]
- Deltoideum, Rollier 1917 [Gryphaeidae]
- Deltoidonautilus, Spath 1927 [Hercoglossidae]
- Deltopecten [Deltopectinidae]
- Deltoptychius, Morris and Roberts 1862 [Deltoptychiidae]
- Deltospirifer [Reticulariidae]
- Demarezites, Ruzhencev 1955 [Cyclolobidae]
- Demeterops, Pribyl and Vanek 1985 [Phacopida]
- Deminucula, Iredale 1931 [Nuculidae]
- Demirastrites [Graptoloidea]
- Demirina [Foraminifera]
- Democrinus, Perrier 1883 [Isocrinida]
- Demoulia, Gray 1838 [Nassariidae]
- Denaecyathus [Ajacicyathida]
- Denagnostus, Jago 1987 [Diplagnostidae]
- Denariocrinus, Schmidt 1942 [Cladida]
- Denayphyllum, Merriam 1973 [Spongophyllidae]
- Denckmannites, Wedekind 1911 [Phacopidae]
- Dendostrea, Swainson 1835 [Ostreidae]
- Dendracis, Milne-Edwards and Haime 1849 [Acroporidae]
- Dendraraea, d'Orbigny 1849 [Microsolenidae]
- Dendritina, d'Orbigny 1826 [Peneroplidae]
- Dendrocircus [Nassellaria]
- Dendroclonella [Demospongea]
- Dendroconus (Swainson 1840) [Conidae]
- Dendrocrinus, J. Hall 1852 [Dendrocrinidae]
- Dendrocyathus, Okulitch and Roots 1947 [Archaeocyathida]
- Dendrocystites, Barrande 1887 [Dendrocystitidae]
- Dendrocystoides [Soluta]
- Dendroecia [Cyclostomata]
- Dendrofavosites, Rukhin 1937 [Favositidae]
- Dendrograptus [Dendroidea]
- Dendrogyra, Ehrenberg 1834 [Meandrinidae]
- Dendroholmia, Spasskiy and Kravtsov 1974 [Holmophyllidae]
- Dendroidea, order, Nicholson 1872 [Graptolithina]
- Dendrophyllia, Blainville 1830 [Dendrophylliidae]
- Dendrophyra [Rhizamminidae]
- Dendrosmilia, Milne-Edwards and Haime 1848 [Caryophylliidae]
- Dendrospyris, Haeckel 1881 [Triospyrididae]
- Dendrostella, Glinski 1957 [Stauriidae]
- Dendrostroma, Lecompte 1952 [Stromatoporellidae]
- Dendrozoum, Fuchs 1915 [Micheliniidae]
- Deneechinus [Lepidocentridae]
- Denemarkia, Pribyl 1946 [Tropidocoryphidae]
- Dengalosia [Chonopectidae]
- Dengyingoconus [Halkieriidae]
- Deningeria, O. Wilckens 1937 [Solenolmiidae]
- Denisonodus, Johnson and Elliott 1996 [Ptyctodontida]
- Dennantia, Tate 1888 [Fasciolariidae]
- Densalvus [Athyrididae]
- Densastroma, Flügel 1959 [Densastromatidae]
- Densepustula [Echinoconchidae]
- Densiphrentis, Ivanovskiy 1963 [Streptelasmatidae]
- Densiphyllum, Dybowski 1873 [Streptelasmatidae]
- Densocyathus [Ajacicyathida]
- Densonella, Shaw 1952 [Menomoniidae]
- Dentachites [Problematica]
- Dentacodina [Conodontophorida]
- Dentalina, d'Orbigny 1826 [Lagenidae]
- Dentalinella [Ichthyolariidae]
- Dentalinoides [Nodosariidae]
- Dentalinopsis [Nodosariidae]
- Dentalitrya [Cyclostomata]
- Dentallopoma [Archaeogastropoda]
- Dentaloscutellum, Chatterton 1971 [Styginidae]
- Dentatocoscinus [Ajacicyathida]
- Dentex, Cuvier 1815 [Sparidae]
- Denticrinus, Klikushin 1985 [Isocrinida]
- Denticulites, Ljaschenko 1957 [Polycylindritidae]
- Dentilasma, Ivanovskiy 1962 [Ketophyllidae]
- Dentimargo, Cossmann 1899 [Marginellidae]
- Dentiporella [Cheilostomata]
- Dentiscala, de Boury 1886 [Epitoniidae]
- Dentistyla, Dall 1889 [Archaeogastropoda]
- Dentiterebra [Neogastropoda]
- Dentoglobigerina, Blow 1979 [Globoquadrinidae]
- Dentokrithe, Khosla and Haskins 1980 [Podocopida]
- Dentonia, L. W. Stephenson 1953 [Corbiculidae]
- Dentrimitra [Mitridae]
- Deocrinus, Hudson 1907 [Parablastoidea]
- Depaocrinus, Wanner 1937 [Cladida]
- Depasophyllum, Grabau 1936 [Pycnostylidae]
- Deprandus, Gilbert 1921 [Anguilliformes]
- Depressiscala, de Boury 1909 [Epitoniidae]
- Derbiocrinus, Wright 1951 [Cladida]
- Derbyina [Meganterididae]
- Derbyoides [Orthotetidae]
- Dercetoides [Alepisauriformes]
- Dereta [Terebrataliidae]
- Dermatopsis, Ogilby 1896 [Ophidiiformes]
- Dermatostroma, Parks 1910 [Lophiostromatidae]
- Dermochelys, de Blainville 1816 [Testudines]
- Dermomurex, Monterosato 1890 [Muricidae]
- Dermosastraea, Beauvais 1970 [Scleractinia]
- Dermoseris, Koby 1887 [Microsolenidae]
- Dermosmilia, Koby 1884 [Dermosmiliidae]
- Dermosmiliopsis, Alloiteau 1952 [Brachyphylliidae]
- Dermosmiliopsis, Alloiteau 1952 [Brachyphylliidae]
- Derolytoceras [Lytoceratidae]
- Derstolida, Iredale 1935 [Cypraeidae]
- Dertonia [Neogastropoda]
- Derventina [Hauerinidae]
- Desatrypa [Karpinskiidae]
- Desertospira () [Pleurotomariida]
- Deshayesia, Raulin 1844 [Ampullinidae]
- Deshayesites, Kazansky 1914 [Deshayesitidae]
- Desioceras, G. Cecioni 1953 [Eothinoceratidae]
- Desistrophia [Amphistrophiidae]
- Deslongchampsia, Morris and Lycett 1851 [Acmaeidae]
- Desmatelesia [Cyclostomata]
- Desmechinus [Temnopleuridae]
- Desmediaperoecia [Diaperoeciidae]
- Desmeplatioecia [Cyclostomata]
- Desmepora [Cyclostomata]
- Desmidocrinus, Angelin 1878 [Monobathrida]
- Desmidopora, Nicholson 1886 [Desmidoporidae]
- Desmiodus, St. John and Worthen 1875 [Chondrichthyes]
- Desmoceras [Cephalopoda]
- Desmoceras, Zittel 1884 [Desmoceratidae]
- Desmochitina [Rhizopodea]
- Desmocladia, Reuss 1874 [Faviidae]
- Desmocoenia [Scleractinia]
- Desmoderma, Schrammen 1937 [Callodictyonidae]
- Desmograptus [Dendroidea]
- Desmophyllites, Spath 1829 [Desmoceratidae]
- Desmophyllum, Ehrenberg 1834 [Caryophylliidae]
- Desmopora [Axinellida]
- Desmoporella, Orvig 1971 [Ptyctodontida]
- Desmorthis [Plectorthidae]
- Desmoscaphites [Cephalopoda]
- Desmospyris, Haeckel 1881 [Triospyrididae]
- Desmostroma, Bol'shakova 1969 [Pseudolabechiidae]
- Desorinassa [Neogastropoda]
- Despujolsia, Neltner and Poctey 1949 [Redlichiida]
- Desquamatia, Alekseeva 1960 [Atrypidae]
- Destombesia [Diploporita]
- Deussenia, L. W. Stephenson 1941 [Melongenidae]
- Deuterospira [Mayncinidae]
- Deveonema, Kulczycki 1957 [Arthrodira]
- Devonamphistrophia [Amphistrophiidae]
- Devonaria [Anopliidae]
- Devonesteus, Jaekel 1927 [Dipteriformes]
- Devonia [Cardiida]
- Devoniotheca [Orthothecida]
- Devonobactrites, Shimanskiy 1962 [Bactritidae]
- Devonoblastus, I. G. Reimann 1935 [Spiraculata]
- Devonocaris [Eocaridacea]
- Devonocheilus, Shimanskiy 1962 [Archiacoceratidae]
- Devonocidaris [Echinocystitoida]
- Devonocoryphe [Proetida]
- Devonodontochile, Snajdr 1985 [Phacopida]
- Devonoproductus [Monticuliferidae]
- Devonoproetus, Lutke 1990 [Proetida]
- Devonopronorites, Bogoslovsky 1954 [Devonopronoritidae]
- Devonospongia [Demospongea]
- Devonosteus [Coelacanthiformes]
- Dhosaites [Sphaeroceratidae]
- Dhrumella [Foraminifera]
- Diabolepis, Chang and Yu 1984 [Dipnotetrapodomorpha]
- Diabolirhynchia [Eatoniidae]
- Diabolocrinus, Wachsmuth and Springer 1897 [Diplobathrida]
- Diacalymene, Kegel 1927 [Calymenidae]
- Diacanthocapsa, Squinabol 1903 [Carpocaniidae]
- Diacanthopora [Cheilostomata]
- Diacoryphe, R. Richter and E. Richter 1951 [Proetidae]
- Diactoma [Parvivaccidae]
- Diacyparia [Demospongea]
- Diadema [Diadematidae]
- Diademoceras, R. Flower 1945 [Rutoceratidae]
- Diademodus, Harris 1951 [Phoebodontidae]
- Diademopsis [Pedinidae]
- Diadochoceras, Hyatt 1900 [Parahoplitidae]
- Diagoceras, Flower 1936 [Spyroceratidae]
- Diagoniella, Rauff 1894 [Protospongiidae]
- Diala, A. Adams 1861 [Dialidae]
- Dialeptophyllum [Anthozoa]
- Dialipina, Schultze 1968 [Palaeonisciformes]
- Dialopsis, Cossmann 1888 [Diastomatidae]
- Dialutocrinus, Wright 1955 [Monobathrida]
- Dialyaster [Disasteridae]
- Diamantopora [Milleporina]
- Diambonia, Cooper and Kindle 1936 [Leptestiidae]
- Diambonioidea, Zeng 1987 [Grorudiidae]
- Diamenocrinus, Oehlert 1892 [Diplobathrida]
- Diamesopora [Cystoporata]
- Diameza, Deshayes 1865 [Seraphsidae]
- Diamphidiocystis [Mitrata]
- Diancopora [Cheilostomata]
- Diandongia, Rong 1974 [Botsfordiidae]
- Diandongpetalichthys, Pan and Wang 1978 [Petalichthyida]
- Dianops, Richter 1923 [Phacopidae]
- Dianulites, Eichwald 1829 [Constellariidae]
- Diaphana, Brown 1827 [Diaphanidae]
- Diaphanometopus, Schmidt 1881 [Phacopida]
- Diaphelasma [Clarkellidae]
- Diaphorocrinus, Eckert 1984 [Crinoidea]
- Diaphragmus [Productidae]
- Diaphus, Eigenmann 1890 [Myctophidae]
- Diaphyodus, Schafhäutl 1863 [Perciformes]
- Diaplectia, Hinde 1884 [Stellispongiidae]
- Diaplococeras, A. Hyatt 1900 [Dinaritinae]
- Diarthema, d'Orbigny 1864 [Aporrhaidae]
- Diartus, Sanfilippo and Riedel 1980 [Coccodiscidae]
- Diaschophyllum, Semenoff-Tian-Chansky 1974 [Aulophyllidae]
- Diasterofungia [Pharetronida]
- Diastoloceras, Teichert and Glenister 1954 [Protocycloceratidae]
- Diastoma, Deshayes 1850 [Diastomatidae]
- Diastomella, Chavan 1952 [Potamididae]
- Diastoporina [Cyclostomata]
- Diatinostoma, Cossmann 1906 [Eustomatidae]
- Diatorocrinus, Wright 1955 [Monobathrida]
- Diatrypesis, Tomlin and Le 1929 [Zygopleuridae]
- Diaziceras [Collignoniceratidae]
- Diazipora, Vinassa de Regni 1921 [Trepostomida]
- Diazoma [Ambocoeliidae]
- Dibaphimitra [Neogastropoda]
- Dibaphus [Neogastropoda]
- Diberus [Mytilidae]
- Dibolachras, Foreman 1973 [Syringocapsidae]
- Dibolbina, Ulrich and Bassler 1923 [Beyrichiidae]
- Dibolbopisthia [Palaeocopida]
- Dibrachiocrinus, Arendt 1968 [Cyrtocrinida]
- Dibranchus, Peters 1876 [Lophiiformes]
- Dibunophyllum, Thomson and Nicholson 1876 [Aulophyllidae]
- Dibunostoma [Thalamoporellidae]
- Dicamara [Meristidae]
- Dicamaropsis [Meristidae]
- Dicaulograptus [Graptoloidea]
- Dicellograptus, Hopkinson 1871 [Bireclinata]
- Dicellomus [Obolidae]
- Diceras, Lamarck 1805 [Diceratidae]
- Diceratobolbina [Palaeocopida]
- Diceratocephalina, Maksimova 1962 [Acrocephalitidae]
- Diceratocephalus, Lu 1954 [Diceratocephalidae]
- Diceratograptus [Graptoloidea]
- Diceratopora [Cheilostomata]
- Diceratopyge, Troedsson 1937 [Ceratopygidae]
- Dicerocardium, Stoppani 1856 [Dicerocardiidae]
- Dicerocaris [Arthropoda]
- Dicerodiscus, Chang 1974 [Agnostida]
- Diceromyonia, Wang 1949 [Platyorthidae]
- Dichelepyge, Harrinton and Leanza 1952 [Ceratopygidae]
- Dichelodus, Giebel 1857 [Cochliodontidae]
- Dichocaeniopsis, Alloiteau 1957 [Rhipidogyridae]
- Dichocoenia, Milne-Edwards and Haime 1848 [Meandrinidae]
- Dichocrinus, Munster 1839 [Dichocrinidae]
- Dichodella [Conodontophorida]
- Dichograptus [Graptoloidea]
- Dichojerea [Demospongea]
- Dichophyllia [Heterocorallia]
- Dichospirifer [Cyrtospiriferidae]
- Dichospiropora [Cyclostomata]
- Dichostreblocrinus, Weller 1930 [Cladida]
- Dichotomites, Koenen 1909 [Polyptychitidae]
- Dichotomoceras [Perisphinctidae]
- Dichotomosmilia [Scleractinia]
- Dichotomosphinctes [Perisphinctidae]
- Dichotrypa [Hexagonellidae]
- Dichozygopleura [Athyrididae]
- Dicirrocrinus, Schmidt 1934 [Crinoidea]
- Dickersonia [Cephalopoda]
- Dickinsiella [Archaeogastropoda]
- Dickinsonia, R. C. Sprigg 1947 [Erniettamorpha]
- Dicoccura [Spumellaria]
- Dicoelites [Belemnitida]
- Dicoelospirifer [Ambocoeliidae]
- Dicoelostrophia [Douvillinidae]
- Dicolocapsa, Haeckel 1881 [Syringocapsidae]
- Dicologlossa, Chabanaud 1927 [Soleidae]
- Dicondylotreta, Me 1993 [Acrotretidae]
- Diconomorpha [Neogastropoda]
- Dicosmos [Cycloneritimorpha]
- Dicostella [Cephalopoda]
- Dicranastrum, Haeckel 1881 [Myelastridae]
- Dicranella [Palaeocopida]
- Dicranoclonella, Schrammen 1937 [Corallistidae]
- Dicranodesma [Leptonidae]
- Dicranodonta, Woods 1899 [Cucullaeidae]
- Dicranogmus, Hawle and Corda 1847 [Lichidae]
- Dicranopeltis, Hawle and Corda 1847 [Lichidae]
- Dicranopora [Cryptostomata]
- Dicranurus, Conrad 1841 [Odontopleuridae]
- Dicrenodus, Romanowski 1853 [Hybodontidae]
- Dicricoconus, Fisher 1962 [Dicricoconidae]
- Dicroa, Foreman 1975 [Parvivaccidae]
- Dicroloma, Gabb 1868 [Aporrhaidae]
- Dicromyocrinus, Jaekel 1918 [Dendrocrinida]
- Dicrorygma [Podocopida]
- Dictenocrinus, Jaekel 1918 [Cladida]
- Dictocythere [Podocopida]
- Dictuonia [Cheilostomata]
- Dictyaraea, Reuss 1867 [Poritidae]
- Dictyastrum [Spumellaria]
- Dictyella, Kobayashi 1933 [Corynexochida]
- Dictyites, Kobayashi 1936 [Corynexochida]
- Dictyobolus, Williams and Curry 1985 [Elkaniidae]
- Dictyocaris [Archaeostraca]
- Dictyocephalus, Ehrenberg 1860 [Theoperidae]
- Dictyoceras, Eichwald 1860 [Orthocerida]
- Dictyoceratida, order [Demospongea]
- Dictyoclostoidea [Schrenkiellidae]
- Dictyoclostus [Productidae]
- Dictyoconella [Foraminifera]
- Dictyoconoides [Rotaliidae]
- Dictyoconus [Orbitolinidae]
- Dictyocoryne, Ehrenberg 1860 [Spongodiscidae]
- Dictyocyathus [Archaeocyathida]
- Dictyofavosites, Chernyshev 1951 [Favositidae]
- Dictyokathina [Foraminifera]
- Dictyomitra, Zittel 1876 [Archaeodictyomitridae]
- Dictyomitrella [Parvicingulidae]
- Dictyonella, Hall 1868 [Eichwaldiidae]
- Dictyonema, Hall 1851 [Dendrograptidae]
- Dictyonina, Cooper 1942 [Paterinidae]
- Dictyonites, Cooper 1956 [Paterinidae]
- Dictyophimus [Nassellaria]
- Dictyophyton [Reticulosa]
- Dictyopleurus [Glyphocyphidae]
- Dictyopodium [Nassellaria]
- Dictyoprora, Haeckel 1881 [Artostrobiidae]
- Dictyopsella [Dictyopsellidae]
- Dictyopselloides [Foraminifera]
- Dictyoptychus, Douvillé 1905 [Trechmannellidae]
- Dictyopyge, Egerton 1847 [Redfieldiidae]
- Dictyorbitolina [Foraminifera]
- Dictyoretmon [Fenestrata]
- Dictyorhabdus [Reticulosa]
- Dictyospongia, Hall and Clarke 1899 [Dictyospongiidae]
- Dictyospyris [Nassellaria]
- Dictyostrophia [Strophodontidae]
- Dictyosycon [Archaeocyathida]
- Dictyothyris, Douville 1880 [Dictyothyrididae]
- Dictyothyropsis [Kingenidae]
- Dictyotoxotis [Palaeocopida]
- Dicyclina [Dicyclinidae]
- Didactylum [Spumellaria]
- Didianema, Woodring 1928 [Liotiidae]
- Didimacar, Iredale 1939 [Arcidae]
- Didontogaster [Phyllodocemorpha]
- Didrepanon, Lane 1971 [Cheiruridae]
- Didwudina, Ivshin 1962 [Ptychopariida]
- Didymaspis, Lankester 1867 [Cephalaspidae]
- Didymelasma [Parallelelasmatidae]
- Didymoceras, Hyatt 1900 [Nostoceratidae]
- Didymocyathus [Ajacicyathida]
- Didymocyrtis, Haeckel 1862 [Coccodiscidae]
- Didymograptus, McCoy 1851 [Graptoloidea]
- Didymoparcium [Tyronellidae]
- Didymosella [Didymosellidae]
- Didymosphaera [Demospongea]
- Didymothyris, Rubel and Modzalevskaya 1967 [Athyrididae]
- Didymotis, Gerhardt 1897 [Posidoniidae]
- Diebelina [Podocopida]
- Diedrothyris [Terebratellidae]
- Dielasma [Dielasmatidae]
- Dielasmella [Cryptonellidae]
- Dielymella, Ulrich and Bassler 1931 [Indianidae]
- Diemanosaukia, Jago and Corbett 1990 [Saukiidae]
- Diempterus, Piette 1876 [Aporrhaidae]
- Dienstina, Richter 1931 [Phacopidae]
- Dientomochilus, Cossmann 1904 [Rostellariidae]
- Dierespongia [Reticulosa]
- Dierisma [Erymnariidae]
- Diestoceras, A. F. Foerste 1924 [Diestoceratidae]
- Diestosphecion [Pharetronida]
- Diestothyris [Terebrataliidae]
- Dietrichia [Cardiida]
- Dietrichiella, Wenz 1938 [Acmaeidae]
- Dieuryocrinus [Sagenocrinida]
- Difficilicrinus, Fres et al. 1979 [Crinoidea]
- Difunites (Glenister and Furnish 1978) [Medlicottiidae]
- Digenuoceras, Foerste 1935 [Oncoceratidae]
- Dightonia [Gigantoporidae]
- Digitaria, Wood 1853 [Astartidae]
- Digitariopsis, Chavan 1952 [Astartidae]
- Digitolabrum, Cossmann 1904 [Rostellariidae]
- Digitophyllites, Zhao 1950 [Procarnitidae]
- Digmocythere [Podocopida]
- Dignagnostus, Khairullina 1975 [Agnostida]
- Dignomia, Hall 1871 [Lingulidae]
- Digonella [Zeilleriidae]
- Digonoclisia, Yu et al. 1974 [Anthozoa]
- Digonophyllum, Wedekind 1923 [Digonophyllidae]
- Digonophyllum (Glossophyllum), Wedekind 1924 [Cyathophyllidae]
- Digonophyllum (Mochlophyllum), Wedekind 1923 [Digonophyllidae]
- Digonus, Guerich 1909 [Homalonotidae]
- Digrypos, Kobayashi 1940 [Asaphida]
- Dihelictera, Copper 1995 [Atrypidae]
- Dihogmochilina, Teichert 1937 [Isochilinidae]
- Dikelocephalites, Sun 1935 [Pterocephaliidae]
- Dikelocephalopsis, Poletaeva 1955 [Asaphida]
- Dikelocephalus, D.D. Owen 1852 [Dikelocephalidae]
- Dikelokephalina, Broegger 1996 [Hungaiidae]
- Dilatilabrum, Cossmann 1904 [Strombidae]
- Dilatobactrites [Anarcestida]
- Dilatocrinus, Webster and Lane 1987 [Monobathrida]
- Dilites [Hyolithomorpha]
- Dilobella [Palaeocopida]
- Diloma [Trochidae]
- Dilophaspis [Archaeostraca]
- Dimelasma [Anthozoa]
- Dimensionaequalirostrum [Pugnacidae]
- Dimerella, Zittel 1870 [Dimerellidae]
- Dimeroceras, J. J. Sepkoski 2002 [Dimeroceratidae]
- Dimeroclymenia, Czarnocki 1989 [Biloclymeniidae]
- Dimerocrinites, Phillips 1839 [Diplobathrida]
- Dimeropyge, Opik 1937 [Dimeropygidae]
- Diminovula, Iredale 1930 [Ovulidae]
- Dimitobelus, Whitehouse 1925 [Dimitobelidae]
- Dimorpha [Demospongea]
- Dimorpharaea, de Fromentel 1861 [Microsolenidae]
- Dimorphina [Foraminifera]
- Dimorphinites [Morphoceratidae]
- Dimorphites, E. Mojsisovics 1893 [Juvavitidae]
- Dimorphocella [Adeonidae]
- Dimorphocellaria [Cheilostomata]
- Dimorphoceras, A. Hyatt 1883 [Dimorphoceratidae]
- Dimorphoceratoides, J. J. Sepkoski 2002 [Neodimorphoceratidae]
- Dimorphocoenia, de Fromentel 1857 [Montlivaltiidae]
- Dimorphoconus [Problematica]
- Dimorphograptoides [Graptoloidea]
- Dimorphograptus [Graptoloidea]
- Dimorpholepis, Teixeira 1947 [Perleididae]
- Dimorphophyllia, Reuss 1864 [Agariciidae]
- Dimorphoplites [Hoplitidae]
- Dimorphoseris, Duncan 1872 [Synastraeidae]
- Dimorphosmilia, Tomes 1902 [Montlivaltiidae]
- Dimorphostylus [Cheilostomata]
- Dimorphotectus, Cossmann 1918 [Proconulidae]
- Dimya, Rouault 1850 [Dimyidae]
- Dimyodon, Munier-Chalmas 1886 [Dimyidae]
- Dinacrocrinus, Moore and Strimple 1969 [Monobathrida]
- Dinardocrinus, Manni and Nicosia 1990 [Cyrtocrinida]
- Dinarella [Dielasmatidae]
- Dinarites, E. v. Mojsisovics 1882 [Dinaritidae]
- Dinaspidella [Pteraspidomorphes]
- Dinaxis, Dall 1895 [Architectonicidae]
- Dindymene, Hawle and Corda 1847 [Encrinuridae]
- Dinelops, Woodward 1907 [Anguilliformes]
- Dinemagraptus [Graptoloidea]
- Dinesus, Etheridge 1896 [Dinesidae]
- Dingus [Mollusca]
- Dinichthys, Newberry 1873 [Dinichthyidae]
- Dinobolus, Hall 1871 [Trimerellidae]
- Dinocardia, class [Problematica]
- Dinocardium, Dall 1900 [Cardiidae]
- Dinocystis, Bather 1898 [Edrioasteridae]
- Dinomischus, Conway Morris 1977 [Problematica]
- Dinomylostoma, Eastman 1906 [Mylostomidae]
- Dinophyllum, Lindström 1882 [Streptelasmatidae]
- Dinorthis, Hall and Clarke 1892 [Plaesiomyidae]
- Dinoscolites [Phyllodocemorpha]
- Dinostrophinx [Anthozoa]
- Dinotocrinus, Kirk 1941 [Cladida]
- Diochthofera [Orthidae]
- Diodoceras, Hyatt and Zittel 1900 [Trigonoceratidae]
- Diodochoceras [Cephalopoda]
- Diodon, Linnaeus 1758 [Diodontidae]
- Diodora, Gray 1821 [Fissurellidae]
- Diogmopteron [Podocopida]
- Diomedeoides, K. Fischer 1985 [Diomedeoididae]
- Dionella [Cheilostomata]
- Dionide, Barrande 1847 [Dionididae]
- Dionidella, Prantl and Pribyl 1950 [Dionididae]
- Dionites, E. v. Mojsisovics 1893 [Tibetitidae]
- Diopatraites [Eunicemorpha]
- Dioristella [Diplospirellidae]
- Diorychopora, Davis 1887 [Auloporidae]
- Diotis [Pterioida]
- Dioxycaris [Thylacocephala]
- Diparelasma [Finkelnburgiidae]
- Diparvapila, MacDonald 1998 [Pseudorotasphaeridae]
- Dipentaspis, Opik 1967 [Damesellidae]
- Dipharus, Clark 1923 [Agnostida]
- Diphuicrinus, Moore and Plummer 1937 [Diphuicrinidae]
- Diphyllospira [Hexactinosa]
- Diphyphyllum, Lonsdale 1845 [Lithostrotionidae]
- Diplacanthograptus [Graptoloidea]
- Diplacanthopoma, Guenther 1887 [Ophidiiformes]
- Diplacmoceras [Placenticeratidae]
- Diplacodus, Davis 1884 [Cochliodontidae]
- Diplactura [Spumellaria]
- Diplagnostus, Jaeckel 1909 [Diplagnostidae]
- Diplaraea, Milaschewitsch 1876 [Haplaraeidae]
- Diplasioceras [Cephalopoda]
- Diplechinus [Stomechinidae]
- Diplesioceras [Ammonitida]
- Dipleura, Green 1832 [Homalonotidae]
- Dipleurites [Pterioida]
- Dipleuropyge, Lermontova 1951 [Asaphida]
- Diploaspis [Diploaspididae]
- Diploastrea, Matthai 1914 [Diploastraeidae]
- Diplobathrida, order, Moore and Laudon 1943 [Crinoidea]
- Diplobeisselina [Cheilostomata]
- Diplobelus [Belemnitida]
- Diploblastus, R. O. Fay 1961 [Spiraculata]
- Diplocava [Cyclostomata]
- Diplocercides [Actinistia]
- Diplochaetetes, Weissermel 1913 [Acanthochaetetidae]
- Diplochilus, Wöhrmann 1894 [Proconulidae]
- Diplochone, Frech 1886 [Cystiphyllidae]
- Diplocidaris [Diplocidaridae]
- Diploclema [Cyclostomata]
- Diplocoenia, Fromentel 1857 [Acroporidae]
- Diploconcha [Serpulimorpha]
- Diplocrinus, Doederlein 1912 [Isselicrinidae]
- Diplocteniopsis, Zlatarski 1968 [Meandrinidae]
- Diploctenium, Goldfuss 1827 [Meandrinidae]
- Diplocyathellus [Ajacicyathida]
- Diplocyma, Pilsbry and Olsson 1935 [Potamididae]
- Diplodesmepora [Cyclostomata]
- Diplodetus [Brissidae]
- Diplodictyon [Lychniscosa]
- Diplododella [Conodontophorida]
- Diplodonta, Bronn 1831 [Ungulinidae]
- Diplodus, Rafinesque 1810 [Sparidae]
- Diploepora, Quenstedt 1879 [Proporidae]
- Diplognathodus [Conodontophorida]
- Diplognathus, Newberry 1878 [Selenosteidae]
- Diplograptus [Diplograptidae]
- Diplogyra, Eguchi 1936 [Stylinidae]
- Diplohelia, Milne-Edwards and Haime 1857 [Oculinidae]
- Diplomeriza [Terebridae]
- Diplomitra [Neogastropoda]
- Diplomoceras, Hyatt 1900 [Diplomoceratidae]
- Diplonorthis, Mitchell 1972 [Archaeorthidae]
- Diplopetalopora [Cyclostomata]
- Diplopholeous [Cheilostomata]
- Diplophyllum, Hall 1851 [Acervulariidae]
- Diploplegma [Spumellaria]
- Diplopleura [Hexactinellida]
- Diplopodia [Pseudodiadematidae]
- Diploporaria [Acanthocladiidae]
- Diploporaster, Mortensen 1950 [Schizasteridae]
- Diploporita, class, Müller 1854 [Blastozoa]
- Diplopsis [Palaeocopida]
- Diploria, Milne-Edwards and Haime 1848 [Faviidae]
- Diplorrhina, Hawle and Corda 1847 [Peronopsidae]
- Diplorula [Cheilostomata]
- Diplosalenia [Parasaleniidae]
- Diploschiza, Conrad 1866 [Plicatulidae]
- Diplosirenites, E. v. Mojsisovics 1893 [Trachyceratidae]
- Diplosolen [Cyclostomata]
- Diplosphaerina [Archaesphaeridae]
- Diplospinella [Chancelloriida]
- Diplospirella [Diplospirellidae]
- Diplostenopora [Trepostomida]
- Diplostoma [Pharetronida]
- Diplostroma [Stromatoporoidea]
- Diplotagma [Stomechinidae]
- Diplotheca, Mathew 1885 [Diplothecidae]
- Diplothecangia, Chevalier 1963 [Scleractinia]
- Diplotremina [Duostominidae]
- Diplotresis [Cheilostomata]
- Diplotrypa, Nicholson 1879 [Halloporidae]
- Dipnoides [Pteraspidomorphi]
- Dipnorhynchus, Etheridge 1906 [Dipteriformes]
- Dipodospyris [Nassellaria]
- Dipterichthys, Arambourg 1967 [Perciformes]
- Dipteriformes, order [Osteichthyes]
- Dipteroblastus, J. Wanner 1940 [Phaenoschismatidae]
- Dipteronotus, Egerton 1854 [Perleididae]
- Dipterophyllum, Roemer 1883 [Zaphrentoididae]
- Dipterus, Sedgwick and Murchison 1828 [Dipteridae]
- Diptyxiella [Heterostrophia]
- Dipulus, Waite 1905 [Ophidiiformes]
- Dipyrgotes, Opik 1967 [Ptychopariida]
- Dipyrogotes [Odontopleurida]
- Diraphora [Bohemiellidae]
- Dircella, Sohl 1960 [Potamididae]
- Diretmus, Johnson 1864 [Beryciformes]
- Dirinus, M' Coy 1844 [Articulata]
- Dirocerithium, Woodring and Stenzel 1959 [Cerithiidae]
- Dirrymoceras [Cephalopoda]
- Disaraea, Fromentel 1861 [Microsolenidae]
- Disaster [Disasteridae]
- Disasteroida, order [Echinoidea]
- Discamminoides [Haplophragmoiidae]
- Discanomalina [Foraminifera]
- Dischides, Jeffreys 1867 [Gadilidae]
- Dischidognathus [Conodontophorida]
- Discinella, Hall 1871 [Mobergellidae]
- Discinisca, Gray 1840 [Disciniidae]
- Discinocaris [Malacostraca]
- Discinopsis, Hall and Clarke 1892 [Craniopsidae]
- Discispongia, Kolb 1910 [Ancorinidae]
- Discitoceras, Hyatt 1894 [Trigonoceratidae]
- Discoactinoceras, Kobayashi 1927 [Huroniidae]
- Discobasis [Heterostrophia]
- Discoceras, Barrande 1867 [Discoceratidae]
- Discoceratites, Schrammen 1928 [Ceratitidae]
- Discocirris [Archaeogastropoda]
- Discoclymenia, Hyatt 1884 [Posttornoceratidae]
- Discocoeila [Pharetronida]
- Discocoenia, Tomes 1884 [Stylophyllidae]
- Discocrinus, Peck 1943 [Roveacrinidae]
- Discocyathus, Milne-Edwards and Haime 1848 [Caryophylliidae]
- Discocyclina [Discocyclinidae]
- Discocystis, Gregory 1897 [Agelacrinitidae]
- Discocytis, d'Orbigny 1854 [Cyclostomata]
- Discodermia, du Bocage 1869 [Theonellidae]
- Discodermites [Demospongea]
- Discofascigera [Frondiporidae]
- Discoflustrellaria [Lunulitidae]
- Discogenus [Archaeogastropoda]
- Discograptus [Tuboidea]
- Discogypsina [Foraminifera]
- Discohelix, Dunker 1847 [Discohelicidae]
- Discohoplites [Hoplitidae]
- Discoidella [Polycopidae]
- Discoides, Parkinson 1811 [Discoididae]
- Discometra [Comatulida]
- Discomiltha, Chavan 1952 [Lucinidae]
- Discophyllites, A. Hyatt 1900 [Discophyllitidae]
- Discophyllum [Hydroida]
- Discoporella, d'Orbigny 1852 [Cupuladriidae]
- Discopsis, de Folin and Perrier 1870 [Vitrinellidae]
- Discoptychites, C. Diener 1916 [Sturiidae]
- Discoramulina [Foraminifera]
- Discorbinella [Discorbinellidae]
- Discorbitina [Foraminifera]
- Discorbitura, Margerel 1968 [Rotaliina]
- Discorinopsis [Discorbidae]
- Discorotalia [Foraminifera]
- Discors [Cardiidae]
- Discosaurus, J. Leidy 1851 [Elasmosauridae]
- Discoscaphites, Meek 1870 [Scaphitidae]
- Discosella [Cheilostomata]
- Discosiphonella, Inai 1936 [Sebargasiidae]
- Discosorida, order, Flower 1950 [Cephalopoda]
- Discosorus, Hall 1852 [Discosoridae]
- Discosparsa, d'Orbigny 1852 [Diastoporidae]
- Discosphinctes [Cephalopoda]
- Discosphinctoides [Cephalopoda]
- Discospirina [Discospirinidae]
- Discostroma, Zittel 1878 [Discostromatidae]
- Discotectonica, Marwick 1931 [Architectonicidae]
- Discotectus, Favre 1913 [Trochidae]
- Discotheca [Archaeogastropoda]
- Discotoma [Trochotomidae]
- Discotreta, Ulrich and Cooper 1936 [Acrothelidae]
- Discotrochus, Milne-Edwards 1848 [Fungiidae]
- Discotrochus (Cylindrophyllia), Yabe and Eguchi 1937 [Turbinoliidae]
- Discotruncatulipora [Cyclostomata]
- Discotrypa [Trepostomida]
- Discotrypina [Trepostomida]
- Discotubigera [Cyclostomata]
- Discouvermetulus [Serpulimorpha]
- Discovibracella [Cheilostomata]
- Disculcina [Palaeocopida]
- Disculina [Chlidonophoridae]
- Disculus, Deshayes 1863 [Architectonicidae]
- Dishelopora [Cheilostomata]
- Disjectopora, Waagen and Wentzel 1888 [Disjectoporidae]
- Disoketa, Gardner 1880 [Aporrhaidae]
- Disolenia [Spumellaria]
- Disopontocypris [Podocopida]
- Disparida, subclass, R. C. Moore and L. R. Laudon 1943 [Crinoidea]
- Disparigonya [Palaeocopida]
- Disparilia [Cardiida]
- Disparistromaria [Axinellida]
- Disphenoceras [Endocerida]
- Disphyllia, He 1978 [Disphyllidae]
- Disphyllum, Fromentel 1861 [Disphyllidae]
- Displodocrinus, Webster and Lane 1987 [Monobathrida]
- Disporella [Lichenoporidae]
- Dissochilus, Cossmann 1888 [Littorinidae]
- Dissostoma, Cossmann 1888 [Pomatiasidae]
- Distansescharella [Cheilostomata]
- Distazeris, Raymond 1937 [Catillicephalidae]
- Distefanaster [Hemiasteridae]
- Distefanella, Parona 1901 [Radiolitidae]
- Distefanella [Cheilostomata]
- Disteginopora [Cheilostomata]
- Distichites, E. Mojsisovics 1893 [Distichitidae]
- Distichoceras [Oppeliidae]
- Distichomeandra, Cuif 1976 [Margarophylliidae]
- Distichophyllia, Cuif 1974 [Distichophylliidae]
- Distichopora [Stylasterina]
- Distobolbina [Palaeocopida]
- Distoloceras, Hyatt 1900 [Neocomitidae]
- Distorsio, Röding 1798 [Personidae]
- Distorsio (Personella), Conrad 1865 [Ranellidae]
- Distriactis [Spumellaria]
- Distriatostylus, Lardeux 1969 [Undastriatostyliolinidae]
- Distyrax, Lane 1988 [Encrinuridae]
- Disulcatella, Fu Lipu 1982 [Virgianidae]
- Disulcinoides [Palaeocopida]
- Ditaxia [Cyclostomata]
- Ditaxipora, MacGillivray 1895 [Catenicellidae]
- Ditaxiporina [Cheilostomata]
- Dithecodendrum [Graptolithina]
- Dithyrocaris [Archaeostraca]
- Ditichia, Sandberger 1891 [Ctenodontidae]
- Ditoecholasma, Simpson 1900 [Ditoecholasmatidae]
- Ditomopyge [Phillipsiidae]
- Ditrabs, Baumgartner 1980 [Tritrabidae]
- Ditraenella [Hadromerida]
- Ditremaster [Hemiasteridae]
- Ditreta, Biernat 1973 [Acrotretidae]
- Ditretus, Pieite 1874 [Campanilidae]
- Ditrupa, Berkeley 1835 [Serpulidae]
- Ditrupula [Serpulimorpha]
- Dittmarites, E. v. Mojsisovics 1893 [Trachyceratidae]
- Dittopora, Dybowski 1877 [Trematoporidae]
- Dittosaria [Pasytheidae]
- Ditypodon [Cardiida]
- Diura [Metacopida]
- Divalinga, Chavan 1951 [Lucinidae]
- Divalinga (Stchepinskya), Chavan 1951 [Lucinidae]
- Divalucina, Iredale 1936 [Lucinidae]
- Divaricardium [Cardiidae]
- Divaricella, Martens 1880 [Lucinidae]
- Divaricella (Egracina), Chavan 1951 [Lucinidae]
- Divarikellia [Cardiida]
- Diversiphyllum [Anthozoa]
- Diversipora [Cyclostomata]
- Diversograptus [Graptoloidea]
- Dividuagnostus, Koroleva 1982 [Agnostida]
- Divisosphinctes [Cephalopoda]
- Dixieus [Echinoidea]
- Dixiphopyge, Brezinski 1988 [Aulacopleuridae]
- Dixonella [Hysterolitidae]
- Dixonia [Discoididae]
- Dizerina [Foraminifera]
- Dizoniopsis, Sacco 1895 [Cerithiopsidae]
- Dizygocrinus, Wachsmuth and Springer 1897 [Monobathrida]
- Dizygopleura [Platycopida]
- Djurjuriceras [Cephalopoda]
- Dmitria [Cyrtospiriferidae]
- Dmitrispirifer [Mucrospiriferidae]
- Dnestrina [Anoplothecidae]
- Dnestroceras, Zhuravleva 1961 [Pseudorthoceratidae]
- Dobrodgeiceras, Nikolov 1963 [Olcostephanidae]
- Dobrogeites, Kittl 1908 [Megaphyllitidae]
- Dobrogelina, Neagu 1979 [Foraminifera]
- Dobrogimactra [Cardiida]
- Dobrowlania, Stensiö 1944 [Acanthothoraci]
- Docidoceras [Otoitidae]
- Dodecaactinella, Reif 1968 [Polyactinellidae]
- Dodecaceria [Spiomorpha]
- Doellocosmia, Bonarelli 1927 [Spirostylidae]
- Doescherella [Dimegelasmidae]
- Doescherina [Hyolithida]
- Dogdathyris [Athyrididae]
- Dogdoa [Innaechiidae]
- Dogielina [Hauerinidae]
- Dogoriella [Palaeocopida]
- Dohaia [Foraminifera]
- Dohmiella, Lutke 1990 [Proetida]
- Dohmophyllum, Wedekind 1923 [Ptenophyllidae]
- Dokidocyathella [Ajacicyathida]
- Dokidocyathus [Ajacicyathida]
- Dokimocephalus, Walcott 1924 [Dokimocephalidae]
- Dokophyllum, Wedekind 1927 [Ketophyllidae]
- Dolabella, Lamarck 1801 [Anaspidea]
- Dolatocrinus, S. S. Lyon 1857 [Melocrinidae]
- Dolborella [Palaeocopida]
- Dolerobasilicus, Harrington and Leanza 1942 [Asaphidae]
- Doleroceras [Oncocerida]
- Dolerocrinus, Prick 1983 [Crinoidea]
- Doleroides, Cooper 1930 [Plectorthidae]
- Dolerolenus, Leanza 1949 [Dolerolenidae]
- Dolerolichia, Sdzuy 1962 [Redlichiida]
- Dolerorthis, Schuchert and Cooper 1931 [Hesperorthidae]
- Dolgaia, Walcott and Resser 1928 [Ptychopariida]
- Dolgeuloma, Rozova 1963 [Eulomidae]
- Dolichoagnostus, Pokrovskaya 1958 [Agnostida]
- Dolichoblastus, A. Breimer and D. B. Macurda 1972 [Fissiculata]
- Dolichocrinus, Loriol 1891 [Crinoidea]
- Dolichocyathus [Cribricyathea]
- Dolichoharpes, Whittington 1949 [Harpetidae]
- Dolicholatirus, Bellardi 1884 [Fasciolariidae]
- Dolichometopsis, Poulson 1927 [Dolichometopidae]
- Dolichomocelypha [Problematica]
- Dolichopteron [Pterioida]
- Dolichopterus [Dolichopteridae]
- Dolichoscapha, Kesling and Ehlers 1958 [Beyrichiidae]
- Dolichoscaphoides [Palaeocopida]
- Dolichupis, Iredale 1930 [Triviidae]
- Dolicrassea [Archaeogastropoda]
- Doliella [Heterostrophia]
- Doliocassis, Dall 1909 [Cassidae]
- Doliocrinus, Warn 1982 [Crinoidea]
- Doliodus, Traquair 1893 [Omalodontidae]
- Doliognathus [Bactrognathidae]
- Dollfusia, Cossmann 1886 [Veneridae]
- Dollocaris [Concavicarida]
- Dollosaurus, Yakovlev 1901 [Mosasauridae]
- Dollymae [Conodontophorida]
- Dolocythere [Podocopida]
- Dolocytheridea [Podocopida]
- Dolomitella [Heterostrophia]
- Doloresella [Tetralobulidae]
- Dolorthoceras, Miller 1931 [Spyroceratidae]
- Dolosella [Fischerinidae]
- Domaszevicella [Palaeocopida]
- Domatoceras, Hyatt 1891 [Grypoceratidae]
- Dombarites, Librovitch 1957 [Delepinoceratidae]
- Dombarocanites, Ruzhencev 1949 [Prolecanitidae]
- Domerginella [Neogastropoda]
- Domeykos [Pachycormiformes]
- Domfrontia [Cornuta]
- Dominicotrochus, Wells 1937 [Caryophylliidae]
- Dominina [Palaeocopida]
- Domokhotia [Spiriferidae]
- Donacoceras, Foerste 1925 [Orthocerida]
- Donacophyllum, Dybowski 1873 [Kyphophyllidae]
- Donacopsis [Cardiida]
- Donacosmilia, Fromentel 1861 [Amphiastreidae]
- Donalosia [Araksalosiidae]
- Donax (Tembrockia) (Gründel 1980) [Donacidae]
- Donella [Rhynchonellida]
- Donellina [Palaeocopida]
- Donetzites, Dampel 1940 [Cleistoporidae]
- Donetzoceras, Librovitch 1946 [Wiedeyoceratidae]
- Dongbaella [Dielasmatidae]
- Dongbeiispirifer [Cyrtiidae]
- Dongshanoceras [Ellesmerocerida]
- Donispirifer, Poletaev 2000 [Spiriferida]
- Donmacythere [Podocopida]
- Donophyllum, Fomichev 1939 [Yatsengiidae]
- Doraclatum [Palaeocopida]
- Dorateuthis, Woodward 1883 [Teuthida]
- Doratiopus [Decapoda]
- Doratocythere [Podocopida]
- Doratodus, Schmid 1861 [Hybodontiformes]
- Dorcadospyris, Haeckel 1881 [Triospyrididae]
- Dorcadungula [Pterioida]
- Dordoniella [Podocopida]
- Dordonophyllia, Alloiteau 1957 [Montlivaltiidae]
- Doreckicrinus, Rasmussen 1961 [Isocrinida]
- Doremataspis, Opik 1967 [Asaphida]
- Dorfopterus [Eurypterida]
- Dorikranites, A. Hyatt 1889 [Tirolitidae]
- Dorippe, Weber 1795 [Dorippidae]
- Dorispina [Ostracoda]
- Dorlodotia, Salee 1920 [Lithostrotionidae]
- Dornbuschia [Podocopida]
- Dorocidaris, A. Agassiz 1869 [Cidaridae]
- Dorothia [Valvulinidae]
- Dorsanum, Gray 1847 [Buccinidae]
- Dorsetensia [Sonniniidae]
- Dorsirugatia [Productellidae]
- Dorsisinus, Sanders 1958 [Rhynchonellida]
- Dorsojugatus, Sysoyev 1968 [Dorsojugatidae]
- Dorsolepis, Jorg 1969 [Palaeonisciformes]
- Dorsolinevitus, Syssoiev 1958 [Sulcavitidae]
- Dorsoplanites [Perisphinctidae]
- Dorsoscyphus [Derbyiidae]
- Dorvillea [Eunicemorpha]
- Doryagnostus, Kobayashi 1939 [Spinagnostidae]
- Doryblastus, R. O. Fay 1961 [Spiraculata]
- Doryconthidium [Spumellaria]
- Dorycrinus, Roemer 1854 [Monobathrida]
- Doryderma, Zittel 1878 [Pleromatidae]
- Dorydictyum [Spumellaria]
- Dorydiscus [Spumellaria]
- Dorydruppa [Spumellaria]
- Dorylonchidium [Spumellaria]
- Doryphacus [Spumellaria]
- Doryplegma [Spumellaria]
- Dorypyge, Dames 1883 [Dorypygidae]
- Dorypygella, Walcott 1905 [Damesellidae]
- Dorypygina, Lermontova 1940 [Dorypygidae]
- Dorysphaera [Spumellaria]
- Dorytreta [Sphenotretidae]
- Dosidicus, Steenstrup 1857 [Teuthida]
- Dosima [Cirripedia]
- Dosina, Gray 1835 [Veneridae]
- Dosinella [Cardiida]
- Dosinia, Scopoli 1777 [Veneridae]
- Dosinia (Dosinobia), Finlay and Marwick 1937 [Veneridae]
- Dosinia (Kakahuia), Marwick 1927 [Veneridae]
- Dosinia (Kereia), Marwick 1927 [Veneridae]
- Dosinia (Raina), Marwick 1927 [Veneridae]
- Dosiniopsella [Cardiida]
- Dosiniopsis, Conrad 1864 [Veneridae]
- Dosinorbis [Cardiida]
- Dostia [Neritidae]
- Douglasocaris [Arthropoda]
- Douvillaster [Toxasteridae]
- Douvilleia, Parnes 1988 [Cephalaspida]
- Douvilleiceras, Grossouvre 1894 [Douvilleiceratidae]
- Douvillina [Douvillinidae]
- Douvillinaria [Douvillinidae]
- Douvillinella [Douvillinidae]
- Douvillinoides [Douvillinidae]
- Douvinella [Strophomenida]
- Dowhatania [Productidae]
- Dowlingoceras, Foerste 1928 [Diestoceratidae]
- Dozyia [Cardiida]
- Drabia, Wilson 1951 [Phylacteridae]
- Drabodiscina, Havlicek 1972 [Trematidae]
- Drabovia, Havlicek 1950 [Draboviidae]
- Drabovinella [Draboviidae]
- Drachiella, Guinot 1976 [Aethridae]
- Dracius [Chlidonophoridae]
- Dracolychnus [Lychniscosa]
- Drahanorhynchus [Schuchertellidae]
- Drahanostrophia [Areostrophiidae]
- Drakonoceras [Discosorida]
- Dreissenomya [Cardiida]
- Drepanaspis [Drepanaspidae]
- Drepanella [Palaeocopida]
- Drepanellina, Ulrich and Bassler 1923 [Beyrichiidae]
- Drepaniota [Foraminifera]
- Drepanites, E. Mojsisovics 1893 [Tibetitidae]
- Drepanocheilus, Meek 1864 [Aporrhaidae]
- Drepanocheilus (Goniocheila), Gabb 1868 [Aporrhaidae]
- Drepanochites [Siphogonuchitidae]
- Drepanoconcho [Archaeogastropoda]
- Drepanoistodus, Lindstrom 1971 [Protopanderodontida]
- Drepanolepis [Furcacudiformes]
- Drepanopterus [Drepanopteridae]
- Drepanopyge, Lu 1961 [Redlichiida]
- Drepanorhyncha, Cooper 1956 [Ancistrorhynchidae]
- Drepanura, Bergeron 1899 [Damesellidae]
- Drepanuroides, Chang 1966 [Redlichiida]
- Dresbachia, Walcott 1916 [Menomoniidae]
- Drevennia [Foraminifera]
- Drevermannia, Schmidt 1909 [Proetidae]
- Drevoella [Hydroida]
- Drewerelasma [Anthozoa]
- Drillia, Gray 1838 [Turridae]
- Drilliola, Cossmann 1903 [Neogastropoda]
- Drilluta, B. Wade 1916 [Fasciolariidae]
- Drilomorpha, order [Polychaeta]
- Drilonereis [Eunicemorpha]
- Drobna, Munster 1839 [Decapoda]
- Droharhynchia [Hadrorhynchiidae]
- Dromia, Weber 1795 [Dromiidae]
- Dromilites, H. Milne-Edwards 1837 [Sphaerodromiidae]
- Dromiopsis, Reuss 1858 [Dromiidae]
- Droogerinella [Foraminifera]
- Drosdoria [Stromatoporoidea]
- Drosdovia [Porifera]
- Drotops, Struve 1990 [Phacopida]
- Druganirhynchia [Tetrarhynchiidae]
- Drumaspis, Resser 1942 [Elviniidae]
- Drummuckina [Strophomenidae]
- Drumoceras, Wang and He 1976 [Thanamitidae]
- Drupa, Röding 1798 [Thaididae]
- Druppastylus [Spumellaria]
- Druppatractus, Haeckel 1887 [Stylosphaeridae]
- Druppocarpus [Spumellaria]
- Druppula [Spumellaria]
- Drydenius, Traquair 1890 [Palaeonisciformes]
- Drymocrinus, Ulrich 1924 [Homocrinidae]
- Dryorhizopsis [Dryorhizopsidae]
- Dryptoscolex [Phyllodocemorpha]
- Duartea [Productidae]
- Duashnoceras [Stephanoceratidae]
- Dubarechinus [Orthopsidae]
- Dubaria [Septatrypidae]
- Dubertretia, Cox 1965 [Radiolitidae]
- Dubioleptina [Sowerbyellidae]
- Dubius [Cribricyathea]
- Dubrovia, Zheltonogova 1961 [Ptenophyllidae]
- Ducdonia, Leleshus 1974 [Proporidae]
- Ductina, Richter 1931 [Phacopidae]
- Dudleyaspis, F. Prantl and A. Pribyl 1949 [Odontopleuridae]
- Dudu, Hahn 1985 [Proetida]
- Duerleyoceras, Turner 1954 [Rutoceratidae]
- Dufrenoya (Kilian and Reboul 1915) [Deshayesitidae]
- Duftonia, Dean 1959 [Dalmanitidae]
- Duibianaspis, Lu and Lin 1984 [Idahoiidae]
- Duibianella [Ostracoda]
- Dukhania [Foraminifera]
- Dulankarella, Rukavishnikova 1956 [Leptellinidae]
- Dulanocrinus [Crinoidea]
- Dulcineaia [Modiomorphida]
- Dulkumella [Palaeocopida]
- Dulunomya [Pholadomyida]
- Dumasella, Cossmann 1901 [Elachisinidae]
- Dumontina [Podocopida]
- Dumortieria [Hildoceratidae]
- Dunbarinella [Schwagerinidae]
- Dunbarula, Ciry 1948 [Schubertellidae]
- Duncanella, Nicholson 1874 [Metriophyllidae]
- Duncania, de Koninck 1872 [Anthozoa]
- Duncaniaster [Holasteridae]
- Duncanoclema [Cystoporata]
- Duncanopora, Sando 1975 [Thecostegitidae]
- Duncanopsammia, Wells 1936 [Dendrophylliidae]
- Dunderbergella, Howell 1945 [Ptychopariida]
- Dunderbergia, Walcott 1924 [Elviniidae]
- Dunedinites, E. T. Tozer 1963 [Proptychitidae]
- Dungulia, Oppenheim 1930 [Caryophylliidae]
- Dunkeria, Carpenter 1856 [Pyramidellidae]
- Dunkleosteus, Newberry 1874 [Dunkleosteidae]
- Dunleithoceras, Foerste 1924 [Oncoceratidae]
- Dunnicrinus, Moore 1967 [Isocrinida]
- Dunsopterus [Eurypterida]
- Dunveganoceras, Warren and Stelck 1940 [Acanthoceratidae]
- Duodecimedusina [Medusae]
- Duostomina, Kristan-Tollmann 1960 [Duostominidae]
- Duotaxis [Verneuilinidae]
- Duperieria [Holectypoida]
- Duplella [Foraminifera]
- Duplexibollia [Palaeocopida]
- Duplicristatia [Palaeocopida]
- Duplipecten, Marwick 1928 [Pectinidae]
- Dupliporocyathus [Ajacicyathida]
- Duplocarinia [Anthozoa]
- Duplophyllum, Koker 1924 [Hapsiphyllidae]
- Durangites [Himalayitidae]
- Durania, Douvillé 1908 [Radiolitidae]
- Durga [Hippuritida]
- Durhamella [Clypeasteroida]
- Duringia [Palaeocopida]
- Durinia, Robison 1988 [Lonchocephalidae]
- Durotrigensia [Parkinsoniidae]
- Durvilleoceras [Meekoceratidae]
- Duryeella [Spinocyrtiidae]
- Dusa, Munster 1839 [Decapoda]
- Dushanirhynchia [Trigonirhynchiidae]
- Dushanophrentis, Yü et al. 1974 [Disphyllidae]
- Duslia [Arthropoda]
- Dutkevichella [Foraminifera]
- Dutkevitchites, Davydov 1984 [Schubertellidae]
- Dutoitella [Podocopida]
- Duvalia, Bayle 1878 [Duvaliidae]
- Duvergiera [Cheilostomata]
- Dvorakia [Conodontophorida]
- Dwightoceras, Ulrich and Foerste 1936 [Bassleroceratidae]
- Dwortsowaecrinus, Stukalina 1967 [Crinoidea]
- Dwykia, Gardiner 1969 [Palaeonisciformes]
- Dyasma [Pholadomyida]
- Dybowskinia, Weyer 1973 [Lambelasmatidae]
- Dybowskites, Pushkin 1987 [Ralfimartitidae]
- Dyfrondicularia [Foraminifera]
- Dymia [Foraminifera]
- Dynatoceras [Discosorida]
- Dyocibicides [Cibicididae]
- Dyoconia [Pharetronida]
- Dyocopanon [Pharetronida]
- Dyoidophragma, Duncan 1939 [Trepostomata]
- Dyreaspis [Pteraspidomorphes]
- Dyrosaurus, Pomel 1894 [Dyrosauridae]
- Dyscheiloceras, Schmidt 1922 [Cheiloceratidae]
- Dyscolia [Dyscoliidae]
- Dyscritella [Dyscritellidae]
- Dyscritellina [Dyscritellidae]
- Dyscritoceras, Ulrich and Foerste 1936 [Bassleroceratidae]
- Dysidea [Dictyoceratida]
- Dysnoetocella [Cheilostomata]
- Dysnoetopla [Mollusca]
- Dysnoetopora [Cheilostomata]
- Dysondonta [Nuculida]
- Dysoristus, Bell in Lochman and Duncan 1941 [Dysoristidae]
- Dysplanus, Burmeister 1843 [Illaenidae]
- Dysprosorthis, Rong 1984 [Chrustenoporidae]
- Dystactella, Hall and Whitfield 1872 [Ctenodontidae]
- Dystactocrinus, Ulrich 1924 [Heterocrinidae]
- Dystactospongia, Miller 1882 [Dystactospongiidae]
- Dytremacephalus, Palmer 1954 [Elviniidae]
- Dzhangirhynchia [Basiliolidae]
- Dzhaprakoceras, Popov 1965 [Maxigoniatitidae]
- Dzhebaglina [Strophomenidae]
- Dzhinsetoceras [Nautilida]
- Dzhulfoceras, Ruzhencev 1962 [Araxoceratidae]
- Dzieduszyckia [Peregrinellidae]
- Dzirulina [Kingenidae]
- Eamesiella [Cardiida]
- Earlachitina [Rhizopodea]
- Earlandia [Earlandiidae]
- Earlandinella [Foraminifera]
- Earlandinita [Earlandinitidae]
- Easchmidtella [Palaeocopida]
- Eastmanalepes, Bannikov 1984 [Carangidae]
- Eatonia [Eatoniidae]
- Eatoniella, Dall 1876 [Eatoniellidae]
- Eatonioides [Eatoniidae]
- Ebala, Gray 1847 [Pyramidellidae]
- Ebalia, Leach 1817 [Leucosiidae]
- Ebetallites [Polychaeta]
- Ebianella [Mollusca]
- Ebianotheca [Orthothecida]
- Eblanaia [Foraminifera]
- Ebocotrochus, Barta-Calmus 1970 [Scleractinia]
- Eboraciceras [Cardioceratidae]
- Eboroceras [Cephalopoda]
- Ebrayia, Ferry 1870 [Scleractinia]
- Ebrayiceras [Morphoceratidae]
- Eburna, Lamarck 1801 [Olividae]
- Eburneotrochus, Barta-Calmus 1970 [Scleractinia]
- Eburnopsis, Tate 1889 [Buccinidae]
- Eburoceras [Ellesmerocerida]
- Ecblastesia, Rauff 1933 [Craticulariidae]
- Eccaparadoxides, Snajdr 1957 [Paradoxididae]
- Eccentricosta [Strophochonetidae]
- Ecclimadictyon, Nestor 1964 [Actinodictyidae]
- Eccliseogyra, Dall 1892 [Epitoniidae]
- Eccoptochile, Hawle and Corda 1847 [Cheiruridae]
- Eccoptochiloides, Prantle and Pribyl 1948 [Phacopida]
- Ecdyceras, Flower 1941 [Hebetoceratidae]
- Echelus, Rafinesque 1810 [Anguilliformes]
- Echicrinus [Isocrinida]
- Echidnina, Bengtson 1986 [Echidninidae]
- Echidnocephalus, Marck 1858 [Actinopterygii]
- Echigoina [Foraminifera]
- Echigophyllum, Yabe and Hayasaka 1924 [Aulophyllidae]
- Echinalosia [Strophalosiidae]
- Echinaria [Echinoconchidae]
- Echinauris, Muir-Wood and Cooper 1960 [Productellidae]
- Echinellopsis, Rovereto 1899 [Littorinidae]
- Echinimathilda (Sohl 1960) [Mathildidae]
- Echininus, Clench and Abbott 1942 [Littorinidae]
- Echinirhynchia, Childs 1969 [Acanthothirididae]
- Echinobathra, Cossmann 1906 [Potamididae]
- Echinocardium, Gray 1825 [Loveniidae]
- Echinocaris [Archaeostraca]
- Echinocava [Cyclostomata]
- Echinochimaera, Lund 1977 [Echinochimaeridae]
- Echinocoelia [Ambocoeliidae]
- Echinocoeliopsis [Reticulariidae]
- Echinoconchella [Echinoconchidae]
- Echinoconchus [Echinoconchidae]
- Echinocyamus [Fibulariidae]
- Echinocyphus [Echinoidea]
- Echinocyphus [Temnopleuridae]
- Echinocystites [Echinocystitidae]
- Echinocythereis, Puri 1953 [Hemicytheridae]
- Echinodus, Davis 1884 [Heterodontidae]
- Echinoencrinites, von Meyer 1826 [Glyptocystitida]
- Echinogalerus [Holectypoida]
- Echinognathus [Eurypterida]
- Echinoida, order, Troschel 1872 [Echinoidea]
- Echinolampas, Gray 1825 [Echinolampadidae]
- Echinomma [Spumellaria]
- Echinopecten [Pterioida]
- Echinopedina [Pedinidae]
- Echinophacops, Zhou 1983 [Phacopida]
- Echinophoria, Sacco 1890 [Cassidae]
- Echinophyllia, Klunzinger 1879 [Pectiniidae]
- Echinopora, Lamarck 1816 [Merulinidae]
- Echinoporina [Foraminifera]
- Echinoprimitia [Palaeocopida]
- Echinopsis, Agassiz 1840 [Orthopsidae]
- Echinopyge, Haas 1968 [Phacopida]
- Echinorhinus [Echinorhinidae]
- Echinosphaerites, Wahlenberg 1818 [Echinosphaeritidae]
- Echinospirifer [Echinospiriferidae]
- Echinostrephus [Echinoida]
- Echinothuria [Echinothuriidae]
- Echinoturris [Neogastropoda]
- Echioceras [Echioceratidae]
- Echioceratoides [Echioceratidae]
- Echiodon, Thompson 1837 [Carapidae]
- Echiurida, phylum [Chaetifera]
- Echmatocrinida, order [Crinoidea]
- Echyropora, Tong-Dzuy 1964 [Parastriatoporidae]
- Eclipes, Jordan and Gilbert 1919 [Gadidae]
- Eclusia [Foraminifera]
- Econgella [Foraminifera]
- Ecphora, Conrad 1843 [Muricidae]
- Ecphorosycon [Neogastropoda]
- Ectasis, Jordan and Gilbert 1919 [Elopidae]
- Ectenaspis, Raymond 1920 [Asaphida]
- Ectenoceras, Ulrich and Foerste 1936 [Ellesmeroceratidae]
- Ectenocrinus, Miller 1889 [Homocrinidae]
- Ectenodesma, Hall 1883 [Pterineidae]
- Ectenodictya [Reticulosa]
- Ectenoglossa, Sinclair 1945 [Obolidae]
- Ectenolites, Ulrich and Foerste 1935 [Ellesmeroceratidae]
- Ectenonotus, Raymond 1920 [Pliomeridae]
- Ectillaenus, Salter 1867 [Illaenidae]
- Ectinechinus [Lepidocentridae]
- Ectocentrites [Lytoceratidae]
- Ectochoristites [Spiriferidae]
- Ectocrinus, Wright 1955 [Monobathrida]
- Ectocycloceras, Ulrich and Foerste 1936 [Protocycloceratidae]
- Ectocyrtoceras, Foerste 1930 [Acleistoceratidae]
- Ectolcites, E. v. Mojsisovics 1893 [Distichitidae]
- Ectonocorys, Foreman 1968 [Theoperidae]
- Ectoprimitia [Palaeocopida]
- Ectoprimitioides [Palaeocopida]
- Ectorensselandia [Stringocephalidae]
- Eczematolepis, Miller 1892 [Ptyctodontida]
- Edaphaspis [Pteraspidomorphes]
- Edaphoceras, Hyatt 1884 [Koninckioceratidae]
- Edaphodon, Buckland 1838 [Callorhinchidae]
- Edaphophyllum, Simpson 1900 [Cystiphyllidae]
- Edapocrinus, Wright 1935 [Cladida]
- Edelsteinaspis, Lermontova 1940 [Edelsteinaspididae]
- Edelsteinia [Stromatoporoidea]
- Edenoceras [Oncocerida]
- Edenopsis [Palaeocopida]
- Edganocare [Trilobita]
- Edhemia [Foraminifera]
- Ediacaria, Sprigg 1947 [Scyphozoa]
- Edithaella [Foraminifera]
- Edithais [Neogastropoda]
- Edithiella, Kurtz 1975 [Asaphiscidae]
- Editia [Podocopida]
- Edmundites, C. Diener 1916 [Trachyceratidae]
- Edomia [Soritidae]
- Edreja, Koneva 1979 [Botsfordiidae]
- Edrioaster, Billings 1858 [Edrioasteridae]
- Edrioasterida, order, Bell 1976 [Edrioasteroidea]
- Edrioasteroidea, class, Billings 1858 [Echinodermata]
- Edriocrinus, Hall 1858 [Crinoidea]
- Edriodiscus [Isorophida]
- Edriophus [Edrioasterida]
- Edriospongia, Ulrich and Everett 1889 [Streptosolenidae]
- Edwardsomeandra, Beauvais 1965 [Scleractinia]
- Edwardsoseris, Alloiteau 1946 [Synastraeidae]
- Edwardsosmilia, Alloiteau 1949 [Montlivaltiidae]
- Effeminatopleura [Palaeocopida]
- Egdetheca [Allathecidae]
- Egenacythere [Podocopida]
- Egerea, Gábor 1936 [Cancellariidae]
- Egerella [Cardiida]
- Egertonia, Cocchi 1866 [Phyllodontidae]
- Egesta [Veneridae]
- Egestas, Finlay 1926 [Turbinellidae]
- Eggerella [Valvulinidae]
- Eggerellina [Verneuilinidae]
- Eggerina [Foraminifera]
- Egilina [Heterostrophia]
- Eglisia, Gray 1847 [Epitoniidae]
- Eglonaspis [Pteraspidomorphes]
- Egorovella [Palaeocopida]
- Egorovia [Podocopida]
- Egorovitina [Podocopida]
- Egorvellina [Palaeocopida]
- Egosiella, Dubatolov 1955 [Pachyporidae]
- Egotistica, Marwick 1934 [Buccinidae]
- Egrabensiceras [Cephalopoda]
- Egrona [Cardiida]
- Egyngolia, Korobov 1980 [Agnostida]
- Ehlersia [Palaeocopida]
- Ehlersoceras, Foerste 1932 [Oncoceratidae]
- Ehmania, Resser 1935 [Alokistocaridae]
- Ehmaniella, Resser 1937 [Alokistocaridae]
- Ehrenbergina [Foraminifera]
- Eichstaettia, Arratia 1987 [Elopiformes]
- Eichwaldia [Eichwaldiidae]
- Eichwaldictya [Cryptostomata]
- Eichwaldoceras, Balashov 1955 [Estonioceratidae]
- Eifelatrypa [Carinatinidae]
- Eifeloceras, Foerste 1929 [Pseudorthoceratidae]
- Eifelocrinus, Wanner 1916 [Cladida]
- Eiffelia, Walcott 1920 [Eiffeliidae]
- Eifyris [Athyrididae]
- Eigilia, Kazantzeva-Selezneva 1977 [Palaeonisciformes]
- Eilotreta [Triplesiidae]
- Eilura, Resser and Endo 1935 [Ptychopariida]
- Eirelithus, Lamont 1941 [Asaphida]
- Eireocrinus, Wright 1951 [Decadocrinidae]
- Eirmocrinus, Strimple and Watkins 1969 [Cladida]
- Eisenackitina [Rhizopodea]
- Eisenackograptus [Graptoloidea]
- Eisobairdia [Bairdiidae]
- Ejinaspis, Lu and Zhou 1986 [Ptychopariida]
- Ejnespirifer [Cyrtiidae]
- Ekalakia, G. Bishop 1976 [Glaessneropsidae]
- Ekaterdonta [Arcida]
- Ekstadia, Soot-Ryen 1964 [Malletiidae]
- Ektyphocythere [Protocytheridae]
- Ekvasophyllum, Parks 1951 [Ekvasophyllidae]
- Ekwanoceras, Foerste and Savage 1927 [Oncoceratidae]
- Ekwipagetia, Frtitz 1973 [Yukoniidae]
- Elachorbis, Iredale 1915 [Vitrinellidae]
- Elachychiton [Neoloricata]
- Elaeacrinus, C. F. Roemer 1851 [Spiraculata]
- Elaeocyma, Dall 1918 [Neogastropoda]
- Elankaspis, Egorova 1976 [Corynexochida]
- Elaphoceras [Discosorida]
- Elaphopora [Cyclostomata]
- Elasma [Lychniscosa]
- Elasmalimus [Demospongea]
- Elasmaspis, Kramarenko 1956 [Pterygometopidae]
- Elasmatium [Bivalvia]
- Elasmocoelia [Pharetronida]
- Elasmocoenia, Milne-Edwards and Haime 1851 [Heterocoeniidae]
- Elasmodectes, Woodward 1888 [Chimaeridae]
- Elasmofungia, Alloiteau 1957 [Haplaraeidae]
- Elasmogyra, Beauvais 1982 [Agariciidae]
- Elasmoierea [Stellispongiidae]
- Elasmophyllia, d'Achiardi 1875 [Montlivaltiidae]
- Elasmophyllum, Hall 1882 [Anthozoa]
- Elasmostoma, Fromentel 1860 [Stellispongiidae]
- Elasmothyris [Linoporellidae]
- Elatioriella [Heterostrophia]
- Elatius, Orlowski 1985 [Ptychopariida]
- Eldenosteus, Miles 1975 [Arthrodira]
- Elder [Mysidacea]
- Elderra [Terebratellidae]
- Eldoradia, Resser 1935 [Ptychopariida]
- Eldroceras [Actinocerida]
- Elea, d'Orbigny 1853 [Eleidae]
- Electra, Lamouroux 1816 [Electridae]
- Electroma, Stoliczka 1871 [Pteriidae]
- Electrona, Goode and Bean 1895 [Myctophidae]
- Eleganella [Heterostrophia]
- Elegantaspis, Ivshin 1962 [Aphelaspididae]
- Eleganticeras [Hildoceratidae]
- Elegantilites [Hyolithida]
- Elegantiscala, deBoury 1911 [Epitoniidae]
- Elegantula, de Gregario 1884 [Semelidae]
- Eleganuculana [Nuculanidae]
- Elegesta [Proschizophoriidae]
- Elegestina, Pokrovskaya 1959 [Redlichiida]
- Elegestolepis, Karatajute-Talimaa 1973 [Chondrichthyes]
- Elenamarginia [Palaeocopida]
- Elenchus [Martiniidae]
- Elenella [Foraminifera]
- Elephantanellum, Barsch 1920 [Caecidae]
- Elephantaria, Oppenheim 1930 [Actinacididae]
- Elergella [Foraminifera]
- Eleusoceras, Flower 1938 [Brevicoceratidae]
- Eleutherocaris [Archaeostraca]
- Eleutherocrania, von Huene 1899 [Acrotretida]
- Eleutherocrinus, B. F. Shumard and L. P. Yandell 1856 [Spiraculata]
- Eleutherokomma [Mucrospiriferidae]
- Elganellus, Suvorova 1958 [Redlichiida]
- Elhasaella [Foraminifera]
- Eliasopora [Ascodictyidae]
- Elibatocrinus, Moore 1940 [Blothrocrinidae]
- Elicicola, Jel and Runnegar 1990 [Yunnanocephalidae]
- Elicrinus, Prokop 1973 [Cladida]
- Eligmus, Eudes-Deslongchampes 1856 [Malleidae]
- Elioserolis [Isopoda]
- Elita [Elythidae]
- Eliva [Spiriferidae]
- Elivella [Martiniidae]
- Elivina, Fredericks 1924 [Spiriferellidae]
- Elkanaspis, Ludvigson 1982 [Remopleurididae]
- Elkania, Ford 1886 [Elkaniidae]
- Elkanisca, Havlicek 1982 [Elkaniidae]
- Elkanoceras [Discosorida]
- Elkanospina [Chancelloriida]
- Elkia, Walcott 1924 [Asaphida]
- Ella [Brachythyrididae]
- Ellatrivia, Iredale 1931 [Triviidae]
- Elleria [Xiphosurida]
- Elleriprion [Eunicemorpha]
- Ellesicrusta [Crustoidea]
- Ellesmerelasma [Anthozoa]
- Ellesmerina [Podocopida]
- Ellesmeroceras, Foerste 1921 [Ellesmeroceratidae]
- Ellicea, Finlay 1928 [Buccinidae]
- Ellinoceras, Balashov 1960 [Actinoceratidae]
- Elliottina [Thecidellinidae]
- Ellipsactinia [Axinellida]
- Ellipsechinus [Echinoida]
- Ellipsella [Palaeocopida]
- Ellipsidium [Spumellaria]
- Ellipsobulimina [Foraminifera]
- Ellipsocephaloides, Kobayashi 1935 [Ellipsocephaloididae]
- Ellipsocephalus, Zenker 1833 [Ellipsocephalidae]
- Ellipsocoenia, d'Orbigny 1850 [Latomeandridae]
- Ellipsocristellaria [Foraminifera]
- Ellipsocyathus, d'Orbigny 1849 [Anthozoa]
- Ellipsodimorphina [Foraminifera]
- Ellipsoglandulina [Foraminifera]
- Ellipsoidastraea, Alloiteau 1957 [Conophyllidae]
- Ellipsoidella [Foraminifera]
- Ellipsoidina [Foraminifera]
- Ellipsolingulina [Foraminifera]
- Ellipsopolymorphina [Foraminifera]
- Ellipsoscapha, L. W. Stephenson 1941 [Scaphandridae]
- Ellipsosmilia, d'Orbigny 1849 [Montlivaltiidae]
- Ellipsostrenua, Kautsky 1945 [Ptychopariida]
- Ellipsostylus [Spumellaria]
- Ellipsotaphrus, Whittard 1952 [Cyclopygidae]
- Ellipsoxiphus, Dunikowski 1882 [Pantanelliidae]
- Ellipsuella, Hupe 1960 [Trilobita]
- Ellipticoblastus, R. O. Fay 1960 [Spiraculata]
- Elliptocyprites [Podocopida]
- Elliptoglossa, Cooper 1956 [Obolidae]
- Elliptoidea [Bivalvia]
- Elliptoseris, Duncan 1880 [Agariciidae]
- Elliptostrophia [Rafinesquinidae]
- Elliptotellina, Cossmann 1886 [Tellinidae]
- Ellisella [Volborthellida]
- Ellisella [Euomphalina]
- Ellisina [Calloporidae]
- Ellisinidra [Alderinidae]
- Ellisonia [Conodonta]
- Ellopetalichthys, Orvig 1957 [Petalichthyida]
- Ellsaspis, Rasetti 1945 [Trilobita]
- Elmaria [Stringocephalidae]
- Elminius [Cirripedia]
- Elmosaurus, Huene 1957 [Nothosauridae]
- Elobiceras, Spath 1921 [Brancoceratidae]
- Elofsonella [Podocopida]
- Elofsonia [Podocopida]
- Elongatanileus, Ji 1986 [Asaphida]
- Elongobula, Finlay 1939 [Buliminoididae]
- Elonichthys, Giebel 1848 [Elonichthyidae]
- Elopiformes, order, Sauvage 1875 [Actinopteri]
- Elopopsis [Elopidae]
- Elpasocrinus, Sprinkle and Wahlm 1994 [Cladida]
- Elpezoe [Myodocopida]
- Elphidiella [Foraminifera]
- Elphidioides [Foraminifera]
- Elphidium, Monfort 1808 [Elphidiidae]
- Elpidocrinus, Strimple 1963 [Diplobathrida]
- Elpinella [Myodocopida]
- Elpisoceras [Discosorida]
- Elrathia, Walcott 1924 [Alokistocaridae]
- Elrathiella, Poulson 1927 [Alokistocaridae]
- Elrathina, Resser 1937 [Ptychopariidae]
- Elsonella [Conodontophorida]
- Elvinia, Walcott 1924 [Elviniidae]
- Elvinoides, Ivshin 1962 [Ptychopariida]
- Elviraspis, Ivshin 1962 [Ptychopariida]
- Elyaspis, Kurtz 1975 [Elviniidae]
- Elymocaris [Archaeostraca]
- Elymospirifer, Wang 1974 [Acrospiriferidae]
- Elysiacea [Sacoglossa]
- Elyx, Brogger 1879 [Conocoryphidae]
- Emaciaticeras [Hildoceratidae]
- Emanuella, Grabau 1923 [Ambocoeliidae]
- Emarginula, Lamarck 1801 [Emarginulinae]
- Emarginula (Tauschia), Haber 1932 [Emarginulinae]
- Emarginulina, Goldfuss 1870 [Archaeogastropoda]
- Emarites [Hyolithida]
- Emballotheca, Levinsen 1909 [Lanceoporidae]
- Embaysgnathus [Conodontophorida]
- Embolophyllum, Pedder 1967 [Ptenophyllidae]
- Embryocrinus, Wanner 1916 [Codiacrinidae]
- Embryotoxotis [Palaeocopida]
- Emeiella [Arthropoda]
- Emeraldella, Walcott 1912 [Arachnomorpha]
- Emeraldellida, order, Størmer 1944 [Merostomoidea]
- Emersonia, Haber 1932 [Emarginulinae]
- Emersonius, Ross 1967 [Balanidae]
- Emileia [Otoitidae]
- Emilites, Ruzhencev 1938 [Adrianitidae]
- Emiluvia, Foreman 1973 [Emiluviidae]
- Emmelichthys, Richardson 1845 [Perciformes]
- Emmonsaspis, Resser and Howell 1938 [Problematica]
- Emmonsia, Milne-Edwards and Haime 1851 [Favositidae]
- Emmrichella, Walcott 1911 [Asaphiscidae]
- Emmrichops, Marek 1961 [Cyclopygidae]
- Empedaspis [Pteraspidomorphes]
- Emperoceras, Hyatt 1894 [Nostoceratidae]
- Emperocrinus, Miller and Gurley 1895 [Diplobathrida]
- Emphasia [Podocopida]
- Empheresula, Harrison 1975 [Sulidae]
- Empleconia, Dall 1908 [Limopsidae]
- Emploca [Hexactinosa]
- Empodesma, Moore and Jeffords 1945 [Polycoeliidae]
- Emsurella, Rozova 1960 [Corynexochida]
- Emsurina, Sivov 1955 [Phacopida]
- Emuella, Pocock 1970 [Emuellidae]
- Enaeta, H. Adams and A. Adams 1853 [Volutidae]
- Enaliornis, H. G. Seeley 1876 [Aves]
- Enallhelia, Milne-Edwards and Haime 1849 [Stylinidae]
- Enallocoenia, d'Orbigny 1849 [Actinastreidae]
- Enallocrinus, Orbigny 1850 [Cladida]
- Enallophrentis [Anthozoa]
- Enallopora [Fenestrata]
- Enallopsammia, Michelotti 1871 [Dendrophylliidae]
- Enammocephalus, Repina 1964 [Ptychopariida]
- Enantiaspis, Rasetti 1972 [Redlichiida]
- Enantiomorphina [Foraminifera]
- Enantiopoda, order, Birshtein 1960 [Remipedia]
- Enantiosphen [Enantiosphenidae]
- Enantiosphenella [Enantiosphenidae]
- Enantiostreon, Bittner 1901 [Prospondylidae]
- Enascocrinus, Strimple and Watkins 1969 [Taxocrinida]
- Enatimene, Iredale 1929 [Muricidae]
- Enatiodentalina [Nodosariidae]
- Enaulofungia, Fromentel 1860 [Stellispongiidae]
- Enayites [Perisphinctidae]
- Enchelion, Hay 1903 [Anguilliformes]
- Enchelurus, Marck 1863 [Actinopterygii]
- Enchelyolepis, Woodward 1918 [Macrosemiiformes]
- Enchondrospirifer [Echinospiriferidae]
- Enchostoma [Problematica]
- Enchoteuthis, Miller and Walker 1968 [Paleololiginidae]
- Encicellaria [Fusicellariidae]
- Enclyclomphalus [Archaeogastropoda]
- Encoiloceras, Hyatt in Zittel 1900 [Tainoceratidae]
- Encrinida, order [Crinoidea]
- Encrinuraspis, Webby et al. 1970 [Encrinuridae]
- Encrinurella, Reed 1915 [Pliomeridae]
- Encrinuroides, Reed 1931 [Encrinuridae]
- Encrinus, Andreae 1764 [Encrinidae]
- Endamplexus, Koker 1924 [Endamplexidae]
- Endelocrinus, Moore and Plummer 1940 [Paradelocrinidae]
- Endeodiadema [Diadematoida]
- Endianaulax, Cossmann 1902 [Archaeogastropoda]
- Endiaplocus [Heterostrophia]
- Endiataenia, Chartron and Cossmann 1902 [Coelostylinidae]
- Endiatoma [Neogastropoda]
- Endiatrachelus, Cossmann 1898 [Nerineidae]
- Endoaspis, Lochman 1956 [Trilobita]
- Endoceras, Hall 1847 [Endoceratidae]
- Endocerida, order, Hyatt in Zittel 1900 [Cephalopoda]
- Endochernella [Foraminifera]
- Endocostea, Whitfield 1877 [Inoceramidae]
- Endodiscosorus, Teichert 1931 [Lowoceratidae]
- Endolobus, Meek et al. 1865 [Koninckioceratidae]
- Endolophia [Metacopida]
- Endomargarus [Pholadomyida]
- Endopachychilus, Cossman 1889 [Neogastropoda]
- Endopachys, Lonsdale 1845 [Dendrophylliidae]
- Endophyllum, Milne-Edwards and Haime 1851 [Endophyllidae]
- Endoplanoceras, Flower 1938 [Nephriticeratidae]
- Endoplectoceras, Foerste 1924 [Phragmoceratidae]
- Endoptygma, Gabb 1877 [Xenophoridae]
- Endosacculus [Problematica]
- Endosacculus [Cirripedia]
- Endospirifer [Cyrtiidae]
- Endospiroplectammina [Foraminifera]
- Endostokesoceras [Discosorida]
- Endostoma, Roemer 1864 [Endostomatidae]
- Endoteba [Endotebidae]
- Endotebanella [Foraminifera]
- Endothecium, Koker 1924 [Endotheciidae]
- Endothyra [Endothyridae]
- Endothyranella [Endothyridae]
- Endothyranopsis [Endothyridae]
- Endotriada [Foraminifera]
- Endotriadella [Foraminifera]
- Endrea [Atrypidae]
- Endymionia, Billings 1865 [Raphiophoridae]
- Engelia [Diadematoida]
- Engenella [Hesperonomiidae]
- Engina, Gray 1839 [Buccinidae]
- Engoniophos [Nassariidae]
- Engraulis, Cuvier 1817 [Clupeidae]
- Enichaster [Spatangoida]
- Enida, A. Adams 1860 [Trochidae]
- Enigmalosia [Araksalosiidae]
- Enigmatichthys, Wade 1935 [Semionotiformes]
- Enigmonia, Iredale 1918 [Anomiidae]
- Enischorhynchus [Crossognathiformes]
- Enkelbergia [Pterioida]
- Ennosviaspis [Pteraspidomorphes]
- Ennucula, Iredale 1931 [Nuculidae]
- Ennucula (Lissanucula), Woodring 1973 [Nuculidae]
- Enophrys, Swainson 1839 [Cottidae]
- Enoploceras, Hyatt in Zittel 1900 [Tainoceratidae]
- Enoploclytia, F. McCoy 1849 [Erymidae]
- Enoplocoelia, Steinmann 1882 [Girtyocoeliidae]
- Enoplonotus, A. Milne-Edwards 1860 [Portunidae]
- Enoplophthalmus, Sauvage 1880 [Osmeriformes]
- Enoplostomella [Schizoporellidae]
- Enoplosus, Lacépède 1802 [Perciformes]
- Enoploura, Wetherby 1879 [Anomalocystitidae]
- Enosphinctes [Cephalopoda]
- Ense, Struve 1992 [Terebratulida]
- Enseosteus, Jaeckel 1919 [Selenosteidae]
- Ensia [Bivalvia]
- Ensiculus, H. Adams 1860 [Pharidae]
- Ensiferites, Reimann 1945 [Astraeospongiidae]
- Ensio [Cardiida]
- Ensiphragma [Cryptostomata]
- Ensipora [Cryptostomata]
- Ensis, Schumacher 1817 [Pharidae]
- Ensisolen [Solenidae]
- Ensitellops [Sportellidae]
- Entacanthus [Neogastropoda]
- Entactinia, Foreman 1963 [Entactiniidae]
- Entactinosphaera, Foreman 1963 [Entactiniidae]
- Entalina, Monterosato 1872 [Entalinidae]
- Entalophora, Lamoureux 1821 [Entalophoridae]
- Entalophoroecia [Diaperoeciidae]
- Entapium, Sanfilippo and Riedel 1973 [Entapiidae]
- Enteletella [Enteletidae]
- Enteletes [Enteletidae]
- Enteletina [Enteletidae]
- Entelophyllia [Anthozoa]
- Entelophyllum, Wedekind 1927 [Entelophyllidae]
- Enterolasma, Simpson 1900 [Streptelasmatidae]
- Enteropleura, Kittl 1912 [Halobiidae]
- Enteropneusta, class [Hemichordata]
- Entimoceras [Discosorida]
- Entogonites, Kittl 1904 [Entogonitidae]
- Entolioides [Entoliidae]
- Entoliopsis [Pterioida]
- Entolium, Meek 1865 [Entoliidae]
- Entomaria [Cheilostomata]
- Entomaspis, Ulrich 1931 [Harpetidae]
- Entomaster [Holasteridae]
- Entomella, Cossmann 1888 [Emarginulinae]
- Entomoconchus [Myodocopida]
- Entomonotis [Pterioida]
- Entomope, Cossmann 1888 [Elachisinidae]
- Entomoprimitia [Myodocopida]
- Entomozoe [Myodocopida]
- Entoprimitia [Podocopida]
- Entoprocta, phylum, Nitsche 1869 [Polyzoa]
- Enygmophyllum, Fomichev 1931 [Uraliniidae]
- Eoacidaspis, Poletaeva 1956 [Lichakephalidae]
- Eoacrochordiceras, Wang 1978 [Acrochordiceratidae]
- Eoacteon, L. W. Stephenson 1955 [Acteoninidae]
- Eoagnostus, Resser and Howell 1938 [Spinagnostidae]
- Eoammosphaeroides [Foraminifera]
- Eoamphistrophia, Harper and Boucot 1978 [Amphistrophiidae]
- Eoanastrophia [Parastrophinidae]
- Eoanguilla, Blot 1978 [Anguillidae]
- Eoannularia [Foraminifera]
- Eoapatokephalus, Rozova 1983 [Asaphida]
- Eoaquapulex [Palaeocopida]
- Eoasaphus, Kobayashi 1936 [Asaphidae]
- Eoasianites, Ruzhencev 1933 [Neoicoceratidae]
- Eoasianites (Zephyroceras), Kullmann 1962 [Neoicoceratidae]
- Eoatlanta, Cossmann 1889 [Hipponicidae]
- Eoaulostomus, Blot 1981 [Aulostomidae]
- Eobactrites, Schindewolf 1932 [Baltoceratidae]
- Eobelemnites, Flower 1945 [Belemnitida]
- Eobeloceras, Schindewolf 1936 [Beloceratidae]
- Eobiernatella [Athyrididae]
- Eobothus, Eastman 1914 [Pleuronectiformes]
- Eobrachythyrina [Choristitidae]
- Eobrachythyris [Spiriferidae]
- Eobromidella [Euprimitidae]
- Eobronteus, Reed 1928 [Styginidae]
- Eobuglossus, Chabanaud 1931 [Pleuronectiformes]
- Eobuntonia [Podocopida]
- Eocalcinus, Via 1959 [Diogenidae]
- Eocallista, Douvillé 1921 [Corbiculidae]
- Eocameroceras [Endocerida]
- Eocamptocrinus, Gluchowski 1980 [Monobathrida]
- Eocamptonectes [Deltopectinidae]
- Eocanites, Librovitch 1957 [Prolecanitidae]
- Eocarcinosoma [Eurypterida]
- Eocarcinus, Withers 1932 [Eocarcinidae]
- Eocaridacea, order, Brooks 1962 [Malacostraca]
- Eocaris [Eocaridacea]
- Eocarniodus [Conodontophorida]
- Eocatenipora, Hamada 1957 [Halysitidae]
- Eocephalodiscus [Cephalodiscida]
- Eoceratoconcha [Cirripedia]
- Eocernina, Gardner 1934 [Ampullinidae]
- Eocheiurus [Phacopida]
- Eochelodes [Mattheviidae]
- Eochelone, Dollo 1903 [Cheloniidae]
- Eochetoceras [Oppeliidae]
- Eochilina [Palaeocopida]
- Eochonetes, Reed 1917 [Sowerbyellidae]
- Eochoristitella [Spiriferidae]
- Eochoristites [Palaeochoristitidae]
- Eochuangia, kobayashi 1935 [Leiostegiidae]
- Eocicerocrinus, Donovan 1989 [Crinoidea]
- Eocithara, Fischer 1883 [Harpidae]
- Eoclarkoceras [Ellesmerocerida]
- Eoclathurella, Casey 1904 [Turridae]
- Eoclavatorella [Foraminifera]
- Eocoelia, Nikiforova 1961 [Leptocoeliidae]
- Eocomatula, Simms 1986 [Eocomatulidae]
- Eoconcha, Cooper 1951 [Nisusiidae]
- Eoconchidium, Rozman 1967 [Virgianidae]
- Eoconchoecia [Podocopida]
- Eoconodontus [Conodontophorida]
- Eoconularia [Scyphozoa]
- Eoconuloides [Foraminifera]
- Eoconulus, Cooper 1956 [Eoconulidae]
- Eocopea [Isopoda]
- Eocoryne [Porifera]
- Eocramatia [Eocramatiidae]
- Eocrassina [Cardiida]
- Eocrinoidea, class, Jaekel 1918 [Blastozoa]
- Eocrioceratites, Wiedmann 1973 [Himantoceratidae]
- Eocristellaria [Robuloididae]
- Eocryphops, Richter 1931 [Phacopidae]
- Eocyckistomiceras [Ellesmerocerida]
- Eocyphinium, F.R.C. Reed 1942 [Proetidae]
- Eocypridina [Cylindroleberididae]
- Eocyrtoceras [Oncocerida]
- Eocyrtosymbole, Pillet 1973 [Proetida]
- Eocystites, Billings 1868 [Ascocystitida]
- Eocytherella [Palaeocopida]
- Eocytheridea [Podocopida]
- Eodallina [Laqueidae]
- Eodalmanella [Ranorthidae]
- Eodalmanitina, Richter 1964 [Dalmanitidae]
- Eodanubites, Wang 1978 [Danubitidae]
- Eoderoceras [Eoderoceratidae]
- Eodesmoceras [Cephalopoda]
- Eodiadema [Diadematidae]
- Eodiaphragmoceras [Ellesmerocerida]
- Eodiaphyodus [Anguilliformes]
- Eodiceras, Pchelintsev 1959 [Hippuritida]
- Eodictyoptychus, Skelton and El-Asa'ad 1992 [Trechmannellidae]
- Eodindymene, Kielan 1960 [Phacopida]
- Eodinobolus, Rowell 1963 [Trimerellidae]
- Eodiodon, Casier 1952 [Tetraodontiformes]
- Eodiorthelasma [Draboviidae]
- Eodiscus, Matthew 1896 [Eodiscidae]
- Eodmitria [Cyrtospiriferidae]
- Eodon [Cardiida]
- Eodonax [Cardiida]
- Eodouvilleiceras [Cephalopoda]
- Eodrevermannia, Pribyl 1946 [Eodrevermanniinae]
- Eodrilla (Casey 1904) [Neogastropoda]
- Eodrillia, Casey 1904 [unclassified genus]
- Eodyscritella [Trepostomida]
- Eoectenolites [Ellesmerocerida]
- Eoendothyra [Foraminifera]
- Eoendothyranopsis [Endothyridae]
- Eoeponidella [Foraminifera]
- Eoescharopora, Jiang 1982 [Problematica]
- Eoetmopterus, Muller and Schollmann 1989 [Squaliformes]
- Eofabiania [Foraminifera]
- Eofallotaspis [Fallotaspididae]
- Eofistulipora [Cystoporata]
- Eofletcheria, Bassler 1950 [Lyoporidae]
- Eofletcheriella, Lin and Chow 1977 [Fletcheriellidae]
- Eoforschia [Foraminifera]
- Eofusulina [Fusulinoidea]
- Eogaleropygus [Cassiduloida]
- Eogaleus, Cappetta 1975 [Carcharhinidae]
- Eogaudryceras, Spath 1927 [Gaudryceratidae]
- Eoglobigerina [Foraminifera]
- Eoglossinotoechia [Glossinotoechiidae]
- Eoglossophyllum, Yü 1974 [Disphyllidae]
- Eoglyptograptus [Graptoloidea]
- Eognathodus [Ozarkodinida]
- Eogonioloboceras, Librovitch 1957 [Eogonioloboceratidae]
- Eogorgia, Hickson 1938 [Gorgonacea]
- Eographiodactylus [Palaeocopida]
- Eogryphus, Hertlein and Grant 1944 [Terebratulida]
- Eogunnarites [Kossmaticeratidae]
- Eoguttulina [Polymorphinidae]
- Eohalysiocrinus, Prokop 1970 [Crinoidea]
- Eoharpa, L. W. Stephenson 1955 [Harpidae]
- Eoharpes, Raymond 1905 [Harpetidae]
- Eohastigerinella [Foraminifera]
- Eohecticoceras [Cephalopoda]
- Eohemithiris, Hertlein and Grant 1944 [Basiliolidae]
- Eoheteroceras [Cephalopoda]
- Eoheteropora [Cyclostomata]
- Eohippotha [Cheilostomata]
- Eohollina [Palaeocopida]
- Eoholocentrum, Sorbini and Tirapelle 1975 [Holocentridae]
- Eohornera [Cyclostomata]
- Eohowellella [Reticulariidae]
- Eohydnophora, Yabe and Eguchi 1936 [Faviidae]
- Eoinachoides, Van Straelen 1933 [Majidae]
- Eoindocrinus, Arendt 1981 [Indocrinidae]
- Eoisotelus, Wang 1938 [Asaphidae]
- Eokaolishania, Wittke 1984 [Kaolishaniidae]
- Eokaotaia, Yuan and Zhao 1994 [Ptychopariidae]
- Eokarpinskia [Karpinskiidae]
- Eokirkidium, Khodalevich and Sapelnikov 1970 [Pentameridae]
- Eokloedenia [Palaeocopida]
- Eokosovopeltis, Pribyl and Vanek 1972 [Styginidae]
- Eokrefftia, Schwarzhans 1895 [Myctophiformes]
- Eolabroides, Eastman 1914 [Perciformes]
- Eolacazella [Thecideidae]
- Eolactoria, Tyler 1975 [Ostraciidae]
- Eolagena [Foraminifera]
- Eolamprogrammus, Daniltshenko 1968 [Brotulidae]
- Eolasiodiscus [Foraminifera]
- Eolasma [Cirripedia]
- Eolates [Latidae]
- Eoleonaspis, Sheng 1974 [Odontopleuridae]
- Eolepas, Withers 1928 [Scalpellidae]
- Eoleperditia, Swartz 1949 [Leperditiidae]
- Eolimea, Cox 1969 [Limidae]
- Eolimulus, Bergström 1968 [Merostomata]
- Eoliotina [Archaeogastropoda]
- Eolomatella [Palaeocopida]
- Eolophotes, Daniltshenko 1980 [Lampridiformes]
- Eolotagnostus, Zhou 1982 [Agnostidae]
- Eoluvarus, Sahni and Choudhary 1977 [Perciformes]
- Eolyttonia [Lyttoniidae]
- Eomactra, Cossmann 1909 [Mactridae]
- Eomadrasites [Kossmaticeratidae]
- Eomanta [Myliobatiformes]
- Eomaoristrophia [Amphistrophiidae]
- Eomarssonella [Foraminifera]
- Eomartiniopsis [Martiniidae]
- Eomathilda, Finlay and Marwick 1937 [Mathildidae]
- Eomegalodus [Hippuritida]
- Eomegastrophia, Cocks 1967 [Leptostrophiidae]
- Eomeretrix [Cardiida]
- Eomesodon, Woodward 1918 [Pycnodontiformes]
- Eomiltha, Cossmann 1912 [Lucinidae]
- Eomiodon, Cox 1935 [Neomiodontidae]
- Eomoelleritia, Abushik 1972 [Leperditicopida]
- Eomonorachus, Delo 1935 [Pterygometopidae]
- Eomonotis, J.A. Grant-Mackie 1978 [Monotidae]
- Eomunidopsis, Via Boada 1981 [Galatheidae]
- Eomuraena, Casier 1967 [Anguilliformes]
- Eomyelodactylus, Foerste 1919 [Crinoidea]
- Eomyrophis, Whitley 1950 [Anguilliformes]
- Eomyrus, Eastman 1905 [Anguilliformes]
- Eonalivkinia [Anazygidae]
- Eonavicula, Arkell 1929 [Arcidae]
- Eonodosaria [Foraminifera]
- Eonomia [Anomiidae]
- Eonomismoceras, Kusina 1974 [Nomismoceratidae]
- Eonotidanus, Pfeil 1893 [Hexanchiformes]
- Eonovitatus [Orthothecida]
- Eontia, MacNeil 1937 [Noetiidae]
- Eoophthalmidium [Ophthalmidiidae]
- Eoorodus, Branson 1914 [Orodontidae]
- Eoorthis, Walcott 1908 [Eoorthidae]
- Eopachydiscus [Pachydiscidae]
- Eopaijenborchella [Podocopida]
- Eopalorbitolina [Foraminifera]
- Eoparalegoceras, Delépine 1939 [Pseudoparalegoceratidae]
- Eoparaparchites [Podocopida]
- Eoparaphorhynchus [Leiorhynchidae]
- Eoparisocrinus, Ausich 1986 [Cladida]
- Eopatelliocrinus, Brower 1973 [Patelliocrinidae]
- Eopecten, Douvillé 1897 [Pectinidae]
- Eopeyeria, Whitley 1947 [Siluriformes]
- Eophacops, Delo 1935 [Phacopidae]
- Eophasma [Eophasmidae]
- Eopholidostrophia, Harper et al. 1967 [Eopholidostrophiidae]
- Eophyllites, L. F. Spath 1930 [Ussuritidae]
- Eophysema, Stewart 1930 [Lucinidae]
- Eopilidiocrinus, Arendt 1981 [Cladida]
- Eopinctada, Tamura 1961 [Pteriidae]
- Eopinnacrinus, Brower and Veinus 1982 [Cladida]
- Eoplacognathus [Conodontophorida]
- Eoplatax, Blot 1969 [Ephippidae]
- Eoplectodonta, R. Kozlowski 1929 [Sowerbyellidae]
- Eoplectus, Tyler 1975 [Eoplectidae]
- Eopleurotoma, Cossmann 1889 [Turridae]
- Eoplicanoplia [Strophochonetidae]
- Eoplicoplasia [Ambocoeliidae]
- Eopolychaetus [Polychaeta]
- Eopolydiexodina [Schwagerinidae]
- Eoporpita [Hydrozoa]
- Eoprodromites, Work et al. 1988 [Prodromitidae]
- Eoproductella [Monticuliferidae]
- Eoproetus [Proetida]
- Eoprosodacna [Cardiida]
- Eoprosopon, Forster 1986 [Homolodromiidae]
- Eoprotelops, Saint-Seine 1949 [Protelopidae]
- Eops, Richter 1940 [Saukiandidae]
- Eopsetta, Jordan and Goss 1887 [Pleuronectiformes]
- Eopsiloceras, L. F. Spath 1930 [Ussuritidae]
- Eopteridium, Rohdendorf 1970 [Palaeostomatopoda]
- Eoptychaspis, Nelson 1951 [Asaphida]
- Eoptychoparia, Rasetti 1955 [Ptychopariidae]
- Eopugnax [Pugnacidae]
- Eoquasiendothyra [Foraminifera]
- Eoradiolites, Douvillé 1909 [Radiolitidae]
- Eoranella, Sayn 1932 [Colombellinidae]
- Eoredlichia, Chang 1950 [Redlichiidae]
- Eoreticularia [Reticulariidae]
- Eorhipidomella, Hints 1971 [Platyorthidae]
- Eorizoceras, Flower 1943 [Graciloceratidae]
- Eorotundracythere [Podocopida]
- Eorupertia [Foraminifera]
- Eosagenites, E. T. Tozer 1971 [Eosagenitidae]
- Eosalenia [Aspidodiadematidae]
- Eosalmo, Wilson 1975 [Salmoniformes]
- Eosaukia, Lu 1954 [Trilobita]
- Eoscaphelasma, Koneva et al. 1990 [Scaphelasmatidae]
- Eoscaphites, Breistroffer 1947 [Scaphitidae]
- Eoschistoceras, Ruzhencev 1952 [Schistoceratidae]
- Eoschizodus, Cox 1951 [Eoschizodidae]
- Eoschubertella [Schubertellidae]
- Eoschuchertella [Areostrophiidae]
- Eoscrupocellaria [Cheilostomata]
- Eoscutellum [Corynexochida]
- Eoscutum [Fibulariidae]
- Eosemicoscinium [Fenestrata]
- Eosericoidea [Taffiidae]
- Eoserranus, Woodward 1908 [Perciformes]
- Eoshumardia, Hupe 1953 [Shumardiidae]
- Eosigmoilina [Foraminifera]
- Eosinica [Umbraculomorpha]
- Eosipho [Neogastropoda]
- Eosiphonalia, Ruth 1942 [Neptuneidae]
- Eosiphonotreta, Havlí?ek 1982 [Siphonotretidae]
- Eosolarium, Chavan 1947 [Architectonicidae]
- Eosolen, Stewart 1930 [Solenidae]
- Eosomichelinoceras, J. Y. Chen 1974 [Baltoceratidae]
- Eosophragmophora [Dalmanellidae]
- Eosotrematorthis [Billingsellidae]
- Eosphaeroma [Isopoda]
- Eosphargis, Lydekker 1889 [Dermochelyidae]
- Eospinatrypa, Cooper 1973 [Atrypidae]
- Eospinus, Tyler and Bannikov 1992 [Tetraodontiformes]
- Eospirifer, C. Schuchert 1913 [Cyrtiidae]
- Eospiriferina, A.W. Grabau 1931 [Adolfiidae]
- Eospongia, Billings 1861 [Streptosolenidae]
- Eostaffella, Rauser-Chernousova 1948 [Eostaffellidae]
- Eostaffeloides [Foraminifera]
- Eostegostoma, Herman and Crochard 1977 [Orectolobiformes]
- Eostenopora [Trepostomida]
- Eostenoporella [Trepostomida]
- Eostephanella [Podocopida]
- Eostrophalosia, Stainbrook 1943 [Araksalosiidae]
- Eostropheodonta, Bancroft 1949 [Leptostrophiidae]
- Eostrophomena [Orthidiellidae]
- Eostrophonella, A. Williams 1950 [Strophonellidae]
- Eostrotion, Vaughan 1915 [Aulophyllidae]
- Eostylodictya, Ormiston and Lane 1976 [Palaeolithocycliidae]
- Eosurcula, Casey 1904 [Turridae]
- Eosynanceja, Casier 1946 [Scorpaeniformes]
- Eosyringothyris [Spinocyrtiidae]
- Eotaphrus [Conodontophorida]
- Eotetragonites, Breistroffer 1947 [Gaudryceratidae]
- Eotetraodon, Tyler 1980 [Tetraodontidae]
- Eotextularia [Palaeospiroplectamminidae]
- Eothalassoceras, Miller and Furnish 1940 [Thalassoceratidae]
- Eothecidellina [Thecidellinidae]
- Eothele, Rowell 1980 [Acrothelidae]
- Eothesbia [Neogastropoda]
- Eothinites, Ruzhencev 1933 [Metalegoceratidae]
- Eothinoceras, F. A. Ulrich et al. 1944 [Bathmoceratidae]
- Eothuria [Lepidocentridae]
- Eothyrsites, Chapman 1934 [Perciformes]
- Eotissotia, Barber 1957 [Pseudotissotiidae]
- Eotomopteris [Phyllodocemorpha]
- Eotorpedo, White 1934 [Torpedinidae]
- Eotournayella [Foraminifera]
- Eotrapezium, Douvillé 1912 [Arcticidae]
- Eotrigonia [Trigoniida]
- Eotrimeroceras, Foerste 1928 [Trimeroceratidae]
- Eotrinucleus, Zhou and Zhang 1978 [Trinucleidae]
- Eotripteroceras, Flower 1943 [Cephalopoda]
- Eotrochactaeon, Akopyan 1972 [Cephalaspida]
- Eotrophonia [Polychaeta]
- Eotuberitina [Tuberitinidae]
- Eoturris, Finlay and Marwick 1937 [Neogastropoda]
- Eoursivivas, Ota 1964 [Corbulidae]
- Eousella [Gusarellidae]
- Eouvigerina [Foraminifera]
- Eovasum, Douvillé 1920 [Vasidae]
- Eoverbeekina [Staffellidae]
- Eoverruca [Cirripedia]
- Eovolutilithes [Neogastropoda]
- Eovolutina [Foraminifera]
- Eovolva, Schilder 1932 [Pediculariidae]
- Eowaeringella [Fusulinoidea]
- Eowedekindellina [Foraminifera]
- Eowellerites, Ruzhencev 1957 [Welleritidae]
- Eowuhuia, Zhang and Wang 1984 [Asaphida]
- Eozanclus, Blot and Voruz 1975 [Zanclidae]
- Eozellia [Schwagerinidae]
- Epacrochordiceras, L. F. Spath 1934 [Acrochordiceratidae]
- Epactridion, Bengston 1990 [Archaeocopida]
- Epadrianites, Schindewolf 1931 [Adrianitidae]
- Epalxis, Cossmann 1889 [Turridae]
- Epancyloceras [Cephalopoda]
- Eparietites [Asteroceratidae]
- Epaspidoceras [Cephalopoda]
- Epetrium, Harris and Burrows 1891 [Triphoridae]
- Epeudea [Calcarea]
- Epheria, Gray 1847 [Littorinidae]
- Ephippelasma, Cooper 1956 [Ephippelasmatidae]
- Ephippioceras, Hyatt 1884 [Ephippoceratidae]
- Ephippiorthoceras, Foerste 1924 [Proteoceratidae]
- Epialtus, H. Milne-Edwards 1834 [Majidae]
- Epiannularia [Foraminifera]
- Epiaster [Spatangoida]
- Epicanites, Schindewolf 1926 [Daraelitidae]
- Epiceltites, G. v. Arthaber 1911 [Columbitidae]
- Epicephalites [Cephalopoda]
- Epiceratites, C. Diener 1915 [Aplococeratidae]
- Epicodakia, Iredale 1930 [Lucinidae]
- Epicosmoceras [Kosmoceratidae]
- Epicymatoceras, Kummel 1956 [Nautilidae]
- Epicyprina, Casey 1952 [Arcticidae]
- Epicyrta [Zeilleriidae]
- Epideira [Neogastropoda]
- Epideroceras [Phricodoceratidae]
- Epidiceras, Douvillé 1935 [Epidiceratidae]
- Epidirella, Iredale 1931 [Turridae]
- Epidirona, Iredale 1939 [Turridae]
- Epidomatoceras, Turner 1954 [Grypoceratidae]
- Epifaxis [Archaeogastropoda]
- Epiglyphioceras, Spath 1930 [Metalegoceratidae]
- Epiglyptoxoceras [Cephalopoda]
- Epigondolella [Gondolellidae]
- Epigonites [Cephalopoda]
- Epigonus, Rafinesque 1810 [Perciformes]
- Epigraptus [Tuboidea]
- Epigymnites, C. Diener 1916 [Gymnitidae]
- Epihalysiocrinus, Arendt 1965 [Crinoidea]
- Epihoplites [Hoplitidae]
- Epijuresanites, Popov 1970 [Spirolegoceratidae]
- Epileymeriella [Leymeriellidae]
- Epilucina, Dall 1901 [Lucinidae]
- Epimorphoceras [Reineckeiidae]
- Epinephelus, Bloch 1793 [Serranidae]
- Epinnula, Poey 1854 [Perciformes]
- Epipallasiceras (Spath 1936) [Perisphinctidae]
- Epipaston [Isorophida]
- Epipeltoceras [Aspidoceratidae]
- Epipetalichthys, Stensiö 1925 [Petalichthyida]
- Epipetschoracrinus, Yakovlev 1956 [Cladida]
- Epiphyllina [Coronatida]
- Epiphyllum [Procyclolitidae]
- Episageceras, Noetling 1904 [Medlicottiidae]
- Episcynia, Morch 1875 [Vitrinellidae]
- Episiphon, Pilsbry 1897 [Gadilinidae]
- Epismilia, Fromentel 1861 [Zardinophyllidae]
- Epismiliopsis, Alloiteau 1952 [Zardinophyllidae]
- Epistomaria [Foraminifera]
- Epistomella, Zittel 1878 [Scleritodermatidae]
- Epistomina [Epistominidae]
- Epistominella, Husezima and Maruhasi 1944 [Discorbidae]
- Epistominita [Foraminifera]
- Epistominitella [Foraminifera]
- Epistominoides [Foraminifera]
- Epistrenoceras [Parkinsoniidae]
- Epistreptophyllum, Milaschewitsch 1876 [Dermosmiliidae]
- Epistroboceras, J.S. Turner 1954 [Trigonoceratidae]
- Epitheles, Fromentel 1860 [Sestrostomellidae]
- Epithemella [Foraminifera]
- Epithyris, Phillips 1841 [Postepithyrididae]
- Epitonium, Röding 1798 [Epitoniidae]
- Epitornoceras, Frech 1902 [Tornoceratidae]
- Epitrochus [Scleractinia]
- Epivirgatites, Spath 1924 [Perisphinctidae]
- Epiwocklumeria, Schindewolf 1937 [Wocklumeriidae]
- Eponidella [Foraminifera]
- Eponides, Montfort 1808 [Eponididae]
- Epopella [Cirripedia]
- Epophioceras [Asteroceratidae]
- Eptingium, Dumitrica 1978 [Eptingiidae]
- Epulotrochus, Cossmann 1918 [Proconulidae]
- Equicastanea [Palaeocopida]
- Equichlamys, Iredale 1929 [Pectinidae]
- Equirostra [Porambonitidae]
- Erato, Risso 1826 [Triviidae]
- Eratocrinus, Kirk 1938 [Cladida]
- Eratoidea, Weinkauff 1879 [Marginellidae]
- Eratopsis, Hörnes and Auinger 1880 [Eratoidae]
- Eratotrivia, Sacco 1894 [Triviidae]
- Erbechinus [Temnopleuridae]
- Erbenaspis, Vanek 1961 [Proetidae]
- Erbenia, Whittke 1984 [Asaphida]
- Erbenicoryphe, Feist 1989 [Proetida]
- Erbenites, Pribyl 1964 [Proetidae]
- Erbenoceras, Bogoslovsky 1962 [Mimosphinctidae]
- Erbia, Lermontova 1940 [Dinesidae]
- Erbiella, Fedyanina 1962 [Dinesidae]
- Erbiopsidella, Pokrovskaya 1959 [Dinesidae]
- Erbiopsis, Lermontova 1940 [Dinesidae]
- Erbocyathus [Ajacicyathida]
- Erdoradites, Ivshin 1962 [Ptychopariida]
- Erectocephalus [Stringocephalidae]
- Erediaspis, Opik 1967 [Tricrepicephalidae]
- Eremactis, Bengston and Conway-Morris 1990 [Chancelloriidae]
- Eremiproetus, R. Richter and E. Richter 1919 [Proetidae]
- Eremitacyathus [Archaeocyathida]
- Eremites, E. v. Mojsisovics 1893 [Sandlingitidae]
- Eremoceras, Hyatt 1884 [Ellesmeroceratidae]
- Eremochitina [Rhizopodea]
- Eremos, Moberg and Segerberg 1906 [Beyrichonidae]
- Eremotrema, Cooper 1956 [Dalmanellidae]
- Eretmocrinus, Lyon and Casseday 1859 [Monobathrida]
- Erettopterus [Eurypterida]
- Ergenica [Cardiida]
- Erginus, Jeffreys 1877 [Archaeogastropoda]
- Eribotrys, Foreman 1968 [Artostrobiidae]
- Ericiatia [Sentosiidae]
- Ericina [Anthozoa]
- Ericusa, H. Adams and A. A 1858 [Volutidae]
- Eridites, Zhuravleva 1961 [Spyroceratidae]
- Eridocamplyus [Trepostomida]
- Eridoconcha [Podocopida]
- Eridophyllum, Milne-Edwards and Haime 1850 [Eridophyllidae]
- Eridopora [Fistuliporidae]
- Eridorthis, Foerste 1909 [Glyptorthidae]
- Eridotrypa, Ulrich 1893 [Trematoporidae]
- Eridotrypella, Duncan 1939 [Atactotoechidae]
- Eridotrypellina [Trepostomida]
- Eriella [Metacopida]
- Erieopterus [Eurypterida]
- Erinella [Cellariidae]
- Erineum, Schrammen 1937 [Cribrospongiidae]
- Erinocystis, Jaekel 1899 [Rhombifera]
- Erioliceras, J. J. Sepkoski 2002 [Brancoceratidae]
- Eripachya, Gabb 1869 [Neogastropoda]
- Eriphia, Latreille 1817 [Eriphiidae]
- Eriphyla, Gabb 1864 [Astartidae]
- Eriphylopsis [Cardiida]
- Eripleura [Podocopida]
- Eripnifera [Rhactorthidae]
- Eriptycha, Meek 1876 [Ringiculidae]
- Eriptychius, Walcott 1892 [Astraspidiformes]
- Erismacanthus, M'Coy 1848 [Cochliodontidae]
- Erismacoscinus, F. Debrenne 1958 [Ajacicyathida]
- Erismodus [Conodonta]
- Erisocrinus, Meek and Worthen 1865 [Erisocrinidae]
- Eristavites [Neocomitidae]
- Eritropsis [Nuculida]
- Erixanium, Opik 1963 [Aphelaspididae]
- Erkosonea [Cyclostomata]
- Erlangbapora, Lin 1975 [Theciidae]
- Ernietta [Erniettamorpha]
- Erniettamorpha, order, Pflug 1972 [Cnidaria]
- Ernogia [Brachiopoda]
- Erodona, Daudin 1802 [Corbulidae]
- Erosaria, Troschel 1863 [Cypraeidae]
- Erphyllum [Cribricyathea]
- Erquelinnesia, L. Dollo 1887 [Thalassemydidae]
- Erquitaia, Cappetta 1989 [Chondrichthyes]
- Erratencrinurus, Krueger 1971 [Encrinuridae]
- Erratencrinurus (Celtencrinurus) (Evitt and Tripp 1974) [Encrinuridae]
- Erraticodon [Conodonta]
- Erraticornus [Hyolithida]
- Errhynx [Rozmanariidae]
- Errina [Stylasterina]
- Errolosteus, Young 1981 [Arthrodira]
- Erromenosteus, Jaeckel 1919 [Arthrodira]
- Erronea, Troschel 1863 [Cypraeidae]
- Ertangia [Palaeocopida]
- Erugatocyathus [Ajacicyathida]
- Erugocentrus, Radovcic 1975 [Beryciformes]
- Erugonia [Trigoniida]
- Ervillia, Turton 1822 [Mesodesmatidae]
- Erycina, Lamarck 1805 [Erycinidae]
- Erycinella, Conrad 1845 [Condylocardiidae]
- Erycinopsis [Cardiida]
- Erycites [Hammatoceratidae]
- Erylus, Gray 1867 [Geodiidae]
- Eryma, Von Meyer 1840 [Erymidae]
- Erymarella [Archaeogastropoda]
- Erymastacus [Decapoda]
- Erymnoceras [Pachyceratidae]
- Eryon, Desmarest 1822 [Eryonidae]
- Escharacytheridea [Podocopida]
- Escharella [Romancheinidae]
- Escharendoceras, Flower 1956 [Proterocameroceratidae]
- Escharicellaria [Cellariidae]
- Escharifora [Coscinopleuridae]
- Escharina [Escharinidae]
- Escharipora [Cheilostomata]
- Escharoides, Milne Edwards 1836 [Romancheinidae]
- Escharopora, Hall 1847 [Ptilodictyonidae]
- Escoffieria, Fontannes 1880 [Potamididae]
- Esconites [Phyllodocemorpha]
- Escornebovina [Foraminifera]
- Escumasia [Cnidaria]
- Eselaevitrigonia [Trigoniida]
- Esericeras [Phymatoceratidae]
- Eshelmania, Wilson 1951 [Dokimocephalidae]
- Esilia [Strophomenidae]
- Eskimoceras, Troedsson 1936 [Eskimoceratidae]
- Esmeraldina, Resser and Howel 1938 [Holmiidae]
- Esopoceras [Orthocerida]
- Espanocrinus, Webster 1976 [Crinoidea]
- Espella [Cyrtiidae]
- Esperites [Demospongea]
- Esseigania, Kobayashi 1944 [Trilobita]
- Essexella [Rhizostomatida]
- Essoidea [Eocaridacea]
- Estea, Iredale 1915 [Barleeidae]
- Esthonia [Anthozoa]
- Esthonioporina, suborder, Astrova 1978 [Fenestrata]
- Esthoniporella [Trepostomida]
- Esthonocrinus, Jeakel 1918 [Cladida]
- Estlandia, Schuchert and Cooper 1931 [Gonambonitidae]
- Estonaceratella [Podocopida]
- Estonielasma, Weyer 1973 [Lambelasmatidae]
- Estonioceras, Noetling 1883 [Estonioceratidae]
- Estoniops, Mannil 1958 [Pterygometopidae]
- Estoniops [Palaeocopida]
- Estonirhynchia [Hebetoechiidae]
- Estonocystis [Diploporita]
- Etacystis [Problematica]
- Etallonia, Oppel 1861 [Axiidae]
- Etalloniella [Lychniscosa]
- Etea, Conrad 1873 [Arcticidae]
- Ethalia, H. Adams and A. A 1854 [Trochidae]
- Ethelocrinus, Kirk 1937 [Cladida]
- Etherella [Hexagonellidae]
- Etheridgaspis, Kobayashi 1940 [Proetida]
- Etheridgia, Tate 1865 [Coeloptychidae]
- Etheridgina [Echinoconchidae]
- Ethmocardium, White 1880 [Cardiidae]
- Ethmocoscinus [Ajacicyathida]
- Ethmocyathus [Ajacicyathida]
- Ethmophyllum [Ajacicyathida]
- Etisus, H. Milne-Edwards 1834 [Xanthidae]
- Etmopterus, Rafinesque 1810 [Etmopteridae]
- Etrema, Hedley 1918 [Turridae]
- Etremopsis, Powell 1942 [Conidae]
- Etrumeus, Bleeker 1853 [Clupeiformes]
- Etymothyris [Centronellidae]
- Etyus, Leach 1822 [Bryocryptellidae]
- Euactaeonina, Wenz 1947 [Architectibranchia]
- Euagassiceras [Arietitidae]
- Euagnostus, Whitehouse 1936 [Agnostida]
- Euaptetoceras [Hammatoceratidae]
- Euaspidoceras [Aspidoceratidae]
- Eubaculites, Spath 1926 [Baculitidae]
- Eubela, Dall 1899 [Turridae]
- Eubiodectes, Hay 1903 [Cladocyclidae]
- Eubostrychoceras, Matsumoto 1967 [Nostoceratidae]
- Eubranoceras [Cephalopoda]
- Eubrochis, Schrammen 1902 [Euretidae]
- Eubrochus [Hexactinosa]
- Eubuliminella [Foraminifera]
- Eucalathis, Fischer and Oehlert 1890 [Chlidonophoridae]
- Eucallista [Cardiida]
- Eucalycoceras, Spath 1923 [Acanthoceratidae]
- Eucalyptocrinites, G. A. Goldfuss 1831 [Eucalyptocrinitidae]
- Eucatillocrinus, Springer 1923 [Crinoidea]
- Eucecryphalus, Haeckel 1860 [Theopiliidae]
- Eucentrurus, Traquair 1901 [Chondrichthyes]
- Eucharitina [Uncinulidae]
- Eucheilodon, Gabb 1860 [Turridae]
- Eucheilopora [Cheilostomata]
- Euchelus, Philippi 1847 [Calliotropidae]
- Euchelus (Hybochelus), Pilsbry 1890 [Trochidae]
- Euchilotheca [Thecosomata]
- Euchitonia, Ehrenberg 1860 [Spongodiscidae]
- Euchrysalis, Laube 1870 [Coelostylinidae]
- Eucidaris [Cidaridae]
- Euciphoceras [Nautilidae]
- Eucladocrinus, Meek 1872 [Monobathrida]
- Euclia, H. Adams and A. Adams 1854 [Cancellariidae]
- Euclichthys, McCulloch 1926 [Gadiformes]
- Euclimacograptus [Graptoloidea]
- Eucominia [Buccinidae]
- Euconactaeon, Meek 1863 [Cylindrobullinidae]
- Euconchitina [Rhizopodea]
- Eucopia [Lophogastrida]
- Eucoroniceras [Arietitidae]
- Eucoronis, Haeckel 1881 [Acanthodesmiidae]
- Eucrassatella, Iredale 1924 [Crassatellidae]
- Eucratea [Cheilostomata]
- Eucraterellina [Metacopida]
- Eucryptocaris [Tanaidacea]
- Eucycloceras [Macrocephalitidae]
- Eucycloidea, Hudleston 1887 [Eucyclidae]
- Eucyclomphalus [Eucyclidae]
- Eucymatoceras, Spath 1927 [Nautilidae]
- Eucymba [Neogastropoda]
- Eucypraedia (Schilder 1939) [Pediculariidae]
- Eucyrtidiellum, Baumgartner 1984 [Eucyrtidiellidae]
- Eucyrtidium, Ehrenberg 1847 [Eucyrtidiidae]
- Eucyrtis [Nassellaria]
- Eucystis, Angelin 1878 [Sphaeronitidae]
- Eucythere, Brady 1868 [Cytherideidae]
- Eucytherura [Podocopida]
- Eudea, Lamouroux 1821 [Stellispongiidae]
- Eudecacythere [Podocopida]
- Eudechenella, Richter 1912 [Proetida]
- Eudesella [Thecideidae]
- Eudesicrinus, Loriol 1882 [Eudesicrinidae]
- Eudesites [Terebratulida]
- Eudictyon, Bistram 1903 [Hexactinosa]
- Eudimerocrinus, Springer 1926 [Diplobathrida]
- Eudmetoceras [Hammatoceratidae]
- Eudoceras, Hyatt 1884 [Oncocerida]
- Eudolium, Dall 1889 [Tonnidae]
- Eudoxina [Eudoxinidae]
- Eudoxochiton, Shuttleworth 1853 [Ischnochitonidae]
- Euerisocrinus, Strimple 1939 [Cladida]
- Eufistulina [Myoida]
- Euflemingites, L. F. Spath 1934 [Flemingitidae]
- Eugabrielona [Archaeogastropoda]
- Eugeniacrinites, Miller 1821 [Cyrtocrinida]
- Euglossodus, White and Moy-Thomas 1940 [Chondrichthyes]
- Euglyphella [Metacopida]
- Eugnathides [Pachycormiformes]
- Eugonocare, Whitehouse 1939 [Aphelaspididae]
- Eugyra, Fromentel 1857 [Faviidae]
- Eugyriopsis, Beauvais 1976 [Scleractinia]
- Euhelia, Milne-Edwards and Haime 1850 [Stylinidae]
- Euhoplites [Hoplitidae]
- Euhoploceras [Sonniniidae]
- Eukloedenella [Kloedenellidae]
- Eulachychiton [Neoloricata]
- Eulepidina [Lepidocyclinidae]
- Euleptochiton [Neoloricata]
- Euleptorhamphus, Gill 1860 [Hemiramphidae]
- Euleraphe, Schrammen 1937 [Astrophorida]
- Eulima, Risso 1826 [Eulimidae]
- Eulimastoma, Bartsch 1916 [Pyramidellidae]
- Eulimella, Forbes and MacAndrew 1846 [Pyramidellidae]
- Eulimene, Wood 1872 [Littorinidae]
- Eulinderina [Foraminifera]
- Eulithota [Semaeostomatida]
- Euloma, Angelin 1854 [Eulomidae]
- Eulomella, Kobayashi 1955 [Trilobita]
- Eulomina, Ružicka 1931 [Bathycheilidae]
- Eulophoceras, Hyatt 1903 [Sphenodiscidae]
- Euloxa [Euloxidae]
- Euloxoceras, Miller et al. 1933 [Spyroceratidae]
- Euloxostomum, McCulloch 1977 [Siphogenerinoididae]
- Eulyra [Fenestrata]
- Eulytoceras, Spath 1927 [Lytoceratidae]
- Eumarcia, Iredale 1925 [Veneridae]
- Eumarcia (Atamarcia), Marwick 1927 [Veneridae]
- Eumedlicottia, Spath 1934 [Medlicottiidae]
- Eumetabolotoechia [Leiorhynchidae]
- Eumetopias, Gill 1866 [Carnivora]
- Eumetria [Retziidae]
- Eumetula, Thiele 1912 [Newtoniellidae]
- Eumitra [Mitridae]
- Eumitrocystella [Mitrata]
- Eumorphactaea, Bittner 1875 [Pilumnidae]
- Eumorphoceras, Girty 1909 [Girtyoceratidae]
- Eumorphocorystes, Van Binkhorst 1857 [Raninidae]
- Eumorphocrinus, J. Wright 1955 [Actinocrinitidae]
- Eumorphocystis [Diploporita]
- Eumorpholites [Hyolithomorpha]
- Eumorphotis [Heteropectinidae]
- Eunaticina, Fischer 1885 [Naticidae]
- Eunice [Eunicemorpha]
- Eunicemorpha, order [Polychaeta]
- Eunicites [Eunicemorpha]
- Euonchonotina, Lu and Zhou 1986 [Olenidae]
- Euonychocrinus, H. L. Strimple 1940 [Taxocrinida]
- Euorthisina [Euorthisinidae]
- Eupachycrinus, Meek and Worthen 1865 [Cladida]
- Eupachydiscus, Spath 1922 [Pachydiscidae]
- Euparthenia [Heterostrophia]
- Eupatagus, L. Agassiz 1847 [Brissidae]
- Euphemitella [Bellerophontida]
- Euphenax [Vulsellidae]
- Euphylax, W. Stimpson 1862 [Portunidae]
- Euphyllia, Dana 1846 [Euphyllidae]
- Euphylloceras [Phylloceratidae]
- Euphyllon [Neogastropoda]
- Euplectella [Lyssacinosida]
- Eupleura, H. Adams and A. Adams 1853 [Muricidae]
- Eupleuroceras, Miller and Cline 1934 [Eupleuroceratidae]
- Euplica, Dall 1889 [Columbellidae]
- Euporosteus [Actinistia]
- Euprimites [Palaeocopida]
- Euprimitia [Palaeocopida]
- Euprioniodina, Ulrich and Bassler 1926 [Prioniodidae]
- Euprionoceras [Cardioceratidae]
- Euprognatha, Stimpson 1871 [Inachoididae]
- Eupsammia, Milne-Edwards and Haime 1848 [Dendrophylliidae]
- Euptychaspis, Ulrich 1931 [Ptychaspididae]
- Euptychoceras, Breistroffer 1952 [Bochianitidae]
- Euptychocrinus, Brow 1994 [Diplobathrida]
- Euractinella [Diplospirellidae]
- Eurekabolbina [Palaeocopida]
- Eurekia, Walcott 1924 [Eurekiidae]
- Eurete, Semper 1868 [Euretidae]
- Eurhinosaurus, O. Abel 1909 [Ichthyopterygia]
- Eurhodia [Pliolampadidae]
- Eurhomalea, Cossmann 1920 [Veneridae]
- Euriclanculus [Archaeogastropoda]
- Eurissolina (Woodring 1928) [Rissoidae]
- Eurites, Kusina 1973 [Muensteroceratidae]
- Euritina [Cheilostomata]
- Euroatrypa [Atrypinidae]
- Eurocyamus [Palaeocopida]
- Europicardium (Popov 1977) [Cardiidae]
- Europisthia [Palaeocopida]
- Europora [Cryptostomata]
- Eurostina, Whitehouse 1939 [Ptychopariida]
- Euryalox [Phymatopleuridae]
- Eurycaraspis, Li 1991 [Petalichthyida]
- Eurycare, Angelin 1854 [Ptychopariida]
- Eurycarpus, Schluter 1868 [Decapoda]
- Eurycephalites [Sphaeroceratidae]
- Eurycheilostoma [Foraminifera]
- Eurychilina, Ulrich 1889 [Palaeocopida]
- Eurycolporhynchus [Petasmariidae]
- Eurycormus [Eurycormidae]
- Eurydike [Neogastropoda]
- Eurydiscites [Demospongea]
- Euryentome [Neogastropoda]
- Euryitycythere [Podocopida]
- Eurymyella, Williams 1912 [Modiomorphidae]
- Eurynoticeras [Oppeliidae]
- Eurynotoides, Berg 1940 [Palaeonisciformes]
- Euryochetus, Cossmann 1896 [Neogastropoda]
- Euryocrinus [Sagenocrinida]
- Eurypholis, Pictet 1850 [Enchodontidae]
- Euryphyllum, Hill 1937 [Hapsiphyllidae]
- Euryplax, Stimpson 1862 [Euryplacidae]
- Eurypneustes [Hemicidaridae]
- Euryprion [Eunicemorpha]
- Eurypterida, order, Burmeister 1843 [Sclerophorata]
- Eurypterus [Eurypteridae]
- Eurypthyris [Postepithyrididae]
- Euryrizoceras, Foerste 1935 [Acleistoceratidae]
- Eurysalenia [Salenioida]
- Eurysaurus, Gaudry 1878 [Eosauropterygia]
- Euryspirifer [Hysterolitidae]
- Eurystichthys [Pachycormiformes]
- Eurystomella [Eurystomellidae]
- Eurystomites, Schröder 1891 [Tarphyceratidae]
- Eurystrotos [Cyclostomata]
- Eurytellina, Fischer 1887 [Tellinidae]
- Eurythyrhombopora [Cryptostomata]
- Eurythyris [Centronellidae]
- Eurytium, Stimpson 1862 [Panopeidae]
- Eurytorus, Gardner 1947 [Turritellidae]
- Eurytreta, Rowell 1966 [Acrotretidae]
- Eusagenites, E. T. Tozer 1971 [Haloritidae]
- Euscalpellum, Hoek 1907 [Calanticidae]
- Euscobinella [Neogastropoda]
- Euseila, Cotton 1951 [Cerithiopsidae]
- Eusemius, Vetter 1881 [Amiiformes]
- Eushantungoceras [Actinocerida]
- Eusiphonella, Zittel 1878 [Stellispongiidae]
- Eusmilia, Milne-Edwards and Haime 1848 [Meandrinidae]
- Eusmiliopsis [Scleractinia]
- Euspilopora [Cryptostomata]
- Euspira, Agassiz 1837 [Naticidae]
- Euspirocrinus, Angelin 1878 [Cladida]
- Eustenocrinus, Ulrich 1924 [Eustenocrinidae]
- Eustephanella [Metacopida]
- Eusthenoceras, Foord 1898 [Pseudorthoceratidae]
- Eusthenotrochus [Turbinoliidae]
- Eustoma, Piette 1855 [Eustomatidae]
- Eustomia [Heterostrophia]
- Eusyringium, Haeckel 1881 [Theoperidae]
- Eutactostomium [Hexactinosa]
- Eutaxocrinus, F. Springer 1906 [Taxocrinidae]
- Eutelecrinus, Wanner 1916 [Monobathrida]
- Euthlipsurella [Podocopida]
- Euthria, Gray 1850 [Buccinidae]
- Euthriofusus, Cossmann 1901 [Fasciolariidae]
- Euthydesma [Cyrtodontida]
- Euthymella, Thiele 1929 [Triphoridae]
- Euthymipecten [Pterioida]
- Euthynnus, Jordan and Gilbert 1882 [Scombridae]
- Euthynotus [Pachycormidae]
- Euthystylus, Cossmann 1895 [Spirostylidae]
- Eutinochilus, Cossmann 1918 [Archaeogastropoda]
- Eutretocystis [Rhombifera]
- Eutrichiurides, Casier 1944 [Trichiuridae]
- Eutrigla, Fraser-Brunner 1938 [Scorpaeniformes]
- Eutrochocrinus, Wachsmuth and Springer 1897 [Monobathrida]
- Eutylus [Myoida]
- Euuvigerina [Foraminifera]
- Euxinella [Wellerellidae]
- Euxinita [Foraminifera]
- Euzittelia [Pharetronida]
- Euzkadiella [Demospongea]
- Evactinostella [Hexagonellidae]
- Evagena, Hahn and Brauckmann 1989 [Proetida]
- Evalea, A. Adams 1860 [Pyramidellidae]
- Evanescirostrum [Leiorhynchidae]
- Evanidisinurostrum [Pugnacidae]
- Evansaspis, Kobayashi 1955 [Corynexochida]
- Evarnula, Finlay 1926 [Buccinulidae]
- Evechinus [Echinometridae]
- Evelynella, Laws 1940 [Pyramidellidae]
- Evencoceras, Balashov 1960 [Intejoceratidae]
- Evencodus [Conodontophorida]
- Evenia [Atomodesmatidae]
- Evenkaspis (Parevenkaspis) (Kramerenko 1952) [Pterygometopidae]
- Evenkia, Berg 1941 [Palaeonisciformes]
- Evenkiella, Soshkina 1955 [Entelophyllidae]
- Evenkina [Plaesiomyidae]
- Evenkinorthis [Plectorthidae]
- Evenkorhynchia, Rozman 1969 [Trigonorhynchiidae]
- Evermannella, Fowler 1901 [Alepisauriformes]
- Everticyclammina [Cyclamminidae]
- Evesthes, Gilbert 1910 [Pleuronectidae]
- Evlanella [Palaeocopida]
- Evlania [Foraminifera]
- Evlanoceras, Zhuravleva 1962 [Polyelasmoceratidae]
- Evlanovia, Egorov 1950 [Aechminellidae]
- Evolutinella [Haplophragmoididae]
- Evolutononion [Foraminifera]
- Evolvocassidulina [Foraminifera]
- Evropeites, Balashova 1966 [Pliomeridae]
- Ewaldocoenia, Oppenheim 1921 [Stylinidae]
- Ewekoroia, Adegoke 1977 [Diastomatidae]
- Ewingella [Nassellaria]
- Exaetocrinus [Cladida]
- Exallias, Jordan and Evermann 1905 [Perciformes]
- Exanthesis, Regnard 1926 [Dactylocalycidae]
- Exastipyx, Holloway 1996 [Corynexochida]
- Exatrypa [Atrypidae]
- Excalibosaurus, McGowan 1986 [Ichthyopterygia]
- Excellichlamys, Iredale 1939 [Pectinidae]
- Exceptothyris [Lobothyrididae]
- Exechestoma, Cossmann 1899 [Potamididae]
- Exechocirsus, Cossmann 1906 [Potamididae]
- Exechonella [Exechonellidae]
- Exelissa, Piette 1860 [Cryptaulacidae]
- Exellia, White and Moy-Thomas 1941 [Exelliidae]
- Exidomonea [Cyclostomata]
- Exigraptus [Graptoloidea]
- Exilia, Conrad 1860 [Ptychatractidae]
- Exilifrons, Crickmay 1968 [Disphyllidae]
- Exilifusus, Conrad 1865 [Fasciolariidae]
- Exilitheca [Allathecidae]
- Exilithecida, order, Sysoyev 1968 [Orthothecimorpha]
- Exiloidea [Neogastropoda]
- Exiteloceras, Hyatt 1894 [Nostoceratidae]
- Exlessia (Piette 1860) [Neotaenioglossa]
- Exochella [Exochellidae]
- Exochoceras [Discosorida]
- Exochocrinus, Burdick and Strimple 1969 [Cladida]
- Exochoecia [Cyclostomata]
- Exochopora [Demospongea]
- Exochorhynchus [Sanguinolitidae]
- Exocoetoides [Actinopterygii]
- Exoconularia [Scyphozoa]
- Exocrinus, Strimple 1949 [Exocrinidae]
- Exocyrtoceras, Flower 1938 [Brevicoceratidae]
- Exodictydia [Demospongea]
- Exogyra, Say 1820 [Gryphaeidae]
- Exomiliopsis [Neogastropoda]
- Exophthalmocythere [Podocopida]
- Exoriocrinus, Strimple and Moore 1971 [Cladida]
- Exosiperna, Iredale 1929 [Crenellidae]
- Exostega, Rafinesque and Clifford 1820 [Anthozoa]
- Exotica, Lamy 1918 [Tellinidae]
- Exotornoceras, Becker 1993 [Posttornoceratidae]
- Expellobolus, Havlí?ek 1982 [Obolidae]
- Experilingula [Obolidae]
- Exputens [Pterioida]
- Exsculptina [Foraminifera]
- Exsulacrinus, Bowsher and Strimple 1986 [Monobathrida]
- Extentitheca [Circothecida]
- Exterocrinus, Knapp 1969 [Cladida]
- Extrania, Qian 1983 [Lisaniidae]
- Extrania [Palaeocopida]
- Eygalierina [Foraminifera]
- Eymarella [Phymatopleuridae]
- Eymekops, Resser and Endo 1935 [Proasaphiscidae]
- Ezhuangia, Qiu and Liu 1983 [Corynexochida]
- Ezonuculana, Nagao 1938 [Nuculanidae]
- Fabagella [Pholadomyida]
- Fabalicypris [Bairdiidae]
- Fabanella [Podocopida]
- Fabella, Conrad 1863 [Sportellidae]
- Faberoceras, Flower 1946 [Westonoceratidae]
- Faberolasma, Bykova 1974 [Aulophyllidae]
- Faberophyllum, Parks 1951 [Ekvasophyllidae]
- Fabiania [Foraminifera]
- Fabularia [Fabulariidae]
- Fabulaspis, Ivshin 1952 [Trilobita]
- Fabulina [Cardiida]
- Faciledictyon [Stromatoporoidea]
- Faciura, Rozova 1963 [Ptychopariida]
- Facivermis, Hou and Chen 1989 [Problematica]
- Fagesia, Pervinquiére 1907 [Vascoceratidae]
- Fahraeusodus [Conodontophorida]
- Failleana, Chatterton and Ludvigson 1976 [Styginidae]
- Fainella [Anthozoa]
- Faksephyllia, Floris 1972 [Caryophylliidae]
- Faksethyris [Dyscoliidae]
- Falanaspis, Tjernvik 1956 [Alsataspididae]
- Falcatoproetus, Lutke 1990 [Proetidae]
- Falciclymenia, Schindewolf 1923 [Rectoclymeniidae]
- Falciferella [Oppeliidae]
- Falciferula, Tchoumatchenco 1987 [Terebratulida]
- Falcimytilus, Cox 1937 [Mytilidae]
- Falcitornoceras, House and Price 1985 [Tornoceratidae]
- Falconoplax, Van Straelen 1933 [Chasmocarcinidae]
- Falites [Ostracoda]
- Falkosites [Eunicemorpha]
- Fallacites, Ruzhencev and Bogoslovskaya 1971 [Homoceratidae]
- Fallacosteus, Long 1990 [Camuropiscidae]
- Fallaticella [Palaeocopida]
- Fallaxispirifer [Reticulariidae]
- Fallaxoproductus [Monticuliferidae]
- Fallocyathus [Ajacicyathida]
- Fallotaspidella, Repina 1964 [Olenellida]
- Fallotaspis, Hupe 1953 [Fallotaspididae]
- Fallotella [Foraminifera]
- Fallotia [Meandropsinidae]
- Falospongia, Rigby 1986 [Hazeliidae]
- Falsatrypa [Atrypidae]
- Falsicatenipora, Hamada 1958 [Halysitidae]
- Falsicolus, Finlay 1930 [Fasciolariidae]
- Falsifusus [Fasciolariidae]
- Falsipollex [Palaeocopida]
- Falsocibicides [Foraminifera]
- Falsocythere [Podocopida]
- Falsogaudryinella [Verneuilinidae]
- Falsoguttulina [Foraminifera]
- Falsopalmula [Robuloididae]
- Falsoplanulina [Foraminifera]
- Falsostyliola [Heterostrophia]
- Falsostyliola [Thecosomata]
- Falsotruncana [Foraminifera]
- Falsurgonina [Foraminifera]
- Falunia [Podocopida]
- Faluniella [Heterostrophia]
- Famatinolithus, Harrington and Leanza 1957 [Trinucleidae]
- Famatinorthis [Giraldiellidae]
- Famaxonia, Weyer 1971 [Stauriida]
- Famenella [Palaeocopida]
- Famennelasma, Weyer 1973 [Hapsiphyllidae]
- Faniathalamia [Calcarea]
- Fanninoceras, McLearn 1930 [Eoderoceratidae]
- Fansycyathus [Ajacicyathida]
- Fanulodiscus [Isorophida]
- Faorina [Schizasteridae]
- Farabophyllum, Lavrusevich 1971 [Phillipsastreidae]
- Farbesiceras [Cephalopoda]
- Farcus, Pessagno et al. 1986 [Farcidae]
- Fardenia, Lamont 1935 [Chilidiopsidae]
- Farisia [Cardiida]
- Farquharsonia [Pedinoida]
- Farrazia [Pholadomyida]
- Farrea, Bowerbank 1862 [Farreidae]
- Farreopsis [Hexactinellida]
- Farroceras [Endocerida]
- Fartulum, Carpenter 1857 [Caecidae]
- Fasciatiphyllia [Scleractinia]
- Fascicoma, Popov 1980 [Acrotretidae]
- Fascicostella [Dalmanellidae]
- Fasciculina [Finkelnburgiidae]
- Fasciculinopora [Cyclostomata]
- Fasciculipora, d'Orbigny 1847 [Cyclostomata]
- Fasciculitubus [Tuboidea]
- Fasciculophyllum, Thomson 1883 [Antiphyllidae]
- Fasciculus [Ctenophora]
- Fascifera, Ulrich and Cooper 1942 [Draboviidae]
- Fascigera [Cyclostomata]
- Fascinewellipecten [Pterioida]
- Fasciolaria, Lamarck 1799 [Fasciolariidae]
- Fascioplex, Marwick 1934 [Neogastropoda]
- Fascipericyclus, Turner 1948 [Pericyclidae]
- Fasciphyllum, Schlüter 1885 [Fasciphyllidae]
- Fascipora [Cyclostomata]
- Fasciseris, Alloiteau and Dercourt 1966 [Scleractinia]
- Fascistropheodonta [Strophodontidae]
- Fascivelvata [Archaeogastropoda]
- Fascizetina [Dalmanellidae]
- Fastigastocythere [Podocopida]
- Fastigiella, Reeve 1848 [Cerithiidae]
- Fastuoscolex [Phyllodocemorpha]
- Fatocephalus, Duan and An 1982 [Remopleurididae]
- Faujasia [Faujasiidae]
- Faujasina, d'Orbigny 1839 [Nonionidae]
- Fauraster [Faujasiidae]
- Fautor, Iredale 1924 [Trochidae]
- Favartia, Jousseaume 1880 [Muricidae]
- Favelloides [Spirotrichia]
- Faveolebris [Podocopida]
- Favia, Oken 1815 [Faviidae]
- Favicella, Hall and Simpson 1887 [Cystoporata]
- Favilynthus [Monocyathida]
- Favistina, Flower 1961 [Stauriidae]
- Favites, Link 1807 [Merulinidae]
- Favitopsis, Alloiteau 1955 [Scleractinia]
- Favocassidulina [Foraminifera]
- Favosichaetetes [Tabulospongida]
- Favositella, Etheridge and Foord 1884 [Ceramoporidae]
- Favosites, Lamarck 1816 [Favositidae]
- Favosyringium [Nassellaria]
- Favrella, Douvillé 1909 [Neocomitidae]
- Favriella, Hornung 1920 [Turridae]
- Favulella [Metacopida]
- Favulina, Patterson and Richardson [Ellipsolagenidae]
- Favusella [Favusellidae]
- Fax, Iredale 1925 [Buccinidae]
- Faxia, Ravn 1933 [Pickworthiidae]
- Faxxia (Ravn 1933) [Neotaenioglossa]
- Fayettevillea, Gordon 1960 [Glaphyritidae]
- Fayettoceras, Foerste 1932 [Valcouroceratidae]
- Fedaiella, Kittl 1894 [Fedaiellidae]
- Fedorowskicyathus, Rozkowska 1980 [Chonophyllidae]
- Fehamya, Mergl 1983 [Orthida]
- Feifelia [Cribrospongiidae]
- Felaniella, Dall 1899 [Ungulinidae]
- Felinotoechia [Leiorhynchidae]
- Felixaraea, Beauvais 1982 [Haplaraeidae]
- Felixastraea, Oppenheim 1930 [Agariciidae]
- Felixigyra, Prever 1909 [Faviidae]
- Felixium, de Laubenfels 1955 [Ichnofossils]
- Fellerites [Palaeocopida]
- Fellius [Cidaroida]
- Felsinella [Foraminifera]
- Femerensia [Palaeocopida]
- Feneoniana, Kolesnikov 1939 [Archaeogastropoda]
- Fenestella, Lonsdale 1839 [Fenestellidae]
- Fenestellata [Fenestrata]
- Fenestepora [Fenestrata]
- Fenesteverta [Fenestrata]
- Fenestralia [Fenestrata]
- Fenestrapora [Fenestrata]
- Fenestraspis, Branisa and Vanek 1973 [Phacopida]
- Fenestrellina [Fenestrata]
- Fenestricardita, Casey 1961 [Carditidae]
- Fenestrirostra, Cooper 1955 [Leiorhynchidae]
- Fenestrocyathus, R.C. Handfield 1971 [Archaeocyathida]
- Fenestrosyrinx [Neogastropoda]
- Fenestrulina [Microporellidae]
- Fengjiachonia [Cardiida]
- Fengtaiella [Ostracoda]
- Fengzuella, Li and Han 1980 [Trimerellidae]
- Fenolignum [Neogastropoda]
- Fensiangia [Problematica]
- Fenxiangella [Clarkellidae]
- Ferayina [Foraminifera]
- Ferenepea, Opik 1967 [Nepeidae]
- Ferestromatopora, Yavorsky 1955 [Ferestromatoporidae]
- Ferganella [Machaerariidae]
- Fergania [Pterioida]
- Ferganoceras, Librovitch 1957 [Ferganoceratidae]
- Ferganoproductus [Productellidae]
- Fernandezaster [Brissidae]
- Ferralsia, Cobbold 1935 [Ptychopariida]
- Ferrax [Productorthidae]
- Ferresium, Blome 1984 [Eptingiidae]
- Ferrobolus, Havlicek 1982 [Dysoristidae]
- Ferrya, Fromentel 1870 [Calamophylliidae]
- Feruminops, Haas 1986 [Phacopida]
- Feurtillia [Foraminifera]
- Fezzanoglossa [Obolidae]
- Ffynnonia, Neuman and Bates 1978 [Platystrophiidae]
- Fibrosopecten [Pterioida]
- Fibula [Cephalaspida]
- Fibularia, Lamarck [Fibulariidae]
- Fibulaster [Fibulariidae]
- Fibulella [Heterostrophia]
- Fibulina [Laganidae]
- Fibulistrophia [Douvillinidae]
- Fibuloptygmatis [Heterostrophia]
- Fibuloptyxis [Heterostrophia]
- Ficariastraea, Alloiteau 1952 [Agatheliidae]
- Ficheuria, Pervinquiére 1910 [Flickiidae]
- Ficopsis, Conrad 1866 [Ficidae]
- Fictoacteon, Stephenson 1952 [Cephalaspida]
- Fictonoba, Ponder 1967 [Barleeidae]
- Ficulomorpha [Neogastropoda]
- Ficulopsis [Neogastropoda]
- Ficus, Röding 1798 [Ficidae]
- Fidelitella [Palaeocopida]
- Fidespirifer [Adolfiidae]
- Fieldaspis, Rasetti 1951 [Zacanthoididae]
- Fieldia, C. D. Walcott 1912 [Fieldiidae]
- Fieldingaspis [Cephalaspidiformes]
- Fieldospongia, Rigby 1986 [Anthaspidellidae]
- Fifeocrinus, Wright 1951 [Cladida]
- Figularia, Jullien 1886 [Cribrilinidae]
- Fijnonion [Foraminifera]
- Fikaites [Cephalopoda]
- Filiatrypa [Atrypidae]
- Filicava [Cyclostomata]
- Filicea [Cyclostomata]
- Filiconcha [Monticuliferidae]
- Filicrisia [Cyclostomata]
- Filicrisina [Cyclostomata]
- Filifascigera [Frondiporidae]
- Filigreenia [Pugnacidae]
- Filisparsa [Oncousoeciidae]
- Filites [Fenestellidae]
- Filodrilla [Neogastropoda]
- Filograna, Oken 1815 [Serpulidae]
- Filogranula [Serpulimorpha]
- Filopecten [Entolioididae]
- Filosina [Corbiculidae]
- Fimbria, Mühlfeldt 1811 [Lucinidae]
- Fimbriaria [Productellidae]
- Fimbrinia [Productellidae]
- Fimbriothyris [Zeilleriidae]
- Fimbrispirifer, Cooper 1942 [Hysterolitidae]
- Finiclymenia, Price and Korn 1989 [Gonioclymeniidae]
- Finkelnburgia, Walcott 1905 [Finkelnburgiidae]
- Finlayella [Cardiida]
- Finlayina [Foraminifera]
- Finlayola, Laws 1937 [Pyramidellidae]
- Finmarchinella [Podocopida]
- Finospirifer [Spiriferidae]
- Fiorella [Palaeocopida]
- Firmacidaris [Echinoidea]
- Firmicornus [Hyolithida]
- Fischerella [Ctenostomata]
- Fischericardium [Cardiida]
- Fischeriella [Archaeogastropoda]
- Fischerina [Fischerinidae]
- Fishericrinus [Cyrtocrinida]
- Fissiculata, order, O. Jaekel 1918 [Blastoidea]
- Fissidentalium, Fischer 1885 [Dentaliidae]
- Fissilobiceras [Hammatoceratidae]
- Fissilunula, Etheridge 1902 [Isocardiidae]
- Fissispongia, King 1938 [Fissispongiidae]
- Fissocephalus, Lermontova 1951 [Ptychopariida]
- Fissocrinocythere [Podocopida]
- Fissocythere [Podocopida]
- Fissodus, St. John and Worthen 1875 [Janassidae]
- Fissoelphidium [Foraminifera]
- Fissurella, Bruguière 1789 [Fissurellidae]
- Fissurellidea, Orbigny 1841 [Emarginulinae]
- Fissuricella [Cheilostomata]
- Fissurina, Reuss 1850 [Ellipsolagenidae]
- Fissurisepta, Seguenza 1863 [Fissurellidae]
- Fistulamina [Hexagonellidae]
- Fistularioides, Blot 1981 [Fistularioididae]
- Fistulicanta [Cystoporata]
- Fistulimurina, Sokolov 1947 [Chaetetidae]
- Fistuliphragma [Cystoporata]
- Fistulipora, McCoy 1850 [Fistuliporidae]
- Fistuliporella [Cystoporata]
- Fistuliporidra [Cystoporata]
- Fistuliramus [Fistuliporidae]
- Fistulisponga [Calcarea]
- Fistulobalanus, Zullo 1984 [Balanidae]
- Fistulocladia [Cheilotrypidae]
- Fistulotrypa [Fistuliporidae]
- Fitzroyella [Uncinulidae]
- Flabellammina [Haplophragmoiidae]
- Flabellamminopsis [Foraminifera]
- Flabelligerimorpha, order [Polychaeta]
- Flabellimutilis [Podocopida]
- Flabellinella [Foraminifera]
- Flabellipecten, Sacco 1897 [Pectinidae]
- Flabellisphinctes [Cephalopoda]
- Flabellispongia [Lychniscosa]
- Flabellocephalus, Jinlin and Shaoxin 1984 [Asaphida]
- Flabellocyclolina [Mayncinidae]
- Flabellopora [Cheilostomata]
- Flabellosmilia, Oppenheim 1930 [Meandrinidae]
- Flabellothyris, Deslongchamps 1884 [Eudesiidae]
- Flabellotrypa [Cyclostomata]
- Flabellulirostrum [Uncinulidae]
- Flabellum, Lesson 1831 [Flabellidae]
- Flaccivelum [Palaeocopida]
- Flacilla, Koken 1896 [Turbinidae]
- Flagellophyllum, Fan 1962 [Adamanophyllidae]
- Flagrospira [Ammodiscidae]
- Flaventia, Jukes-Browne 1908 [Veneridae]
- Flectospira [Cornuspiridae]
- Flemingia [Ostracoda]
- Flemingites, Waagen 1892 [Flemingitidae]
- Flemingopsis [Ostracoda]
- Flemingostrea, Vredenburg 1916 [Ostreidae]
- Flemmingia, Kittl 1894 [Proconulidae]
- Fletcheria, Milne-Edwards and Haime 1851 [Fletcheriidae]
- Fletcheriella, Sokolov 1955 [Fletcheriellidae]
- Fletcherina, Lang et al. 1955 [Pycnostylidae]
- Fletcherithyroides [Zeilleriidae]
- Flexanulus [Ajacicyathida]
- Flexaria [Productidae]
- Flexathyris [Athyrididae]
- Flexiclymenia, Czarnocki 1989 [Cymaclymeniidae]
- Flexicollicamara [Camaroidea]
- Flexicorbula, Chavan 1947 [Corbulidae]
- Flexihydra [Hydroida]
- Flexiostroma [Stromatoporoidea]
- Flexispinites [Cephalopoda]
- Flexopecten [Pectinidae]
- Flexuocythere [Podocopida]
- Flexus [Podocopida]
- Flickia [Flickiidae]
- Flindersichthys, Longman 1932 [Elopiformes]
- Flintinella [Hauerinidae]
- Flobertia [Merostomata]
- Floria, Turnsek 1981 [Actinastreidae]
- Floribella, Woodring 1970 [Gastropoda]
- Floridina, Jullien 1882 [Onychocellidae]
- Floridinella [Opesiulidae]
- Floridiscus [Isorophida]
- Florimetis, Olsson and Harbison 1953 [Tellinidae]
- Flosculinella [Alveolinidae]
- Flourensina [Foraminifera]
- Flowerites [Discosorida]
- Floweroceras, Miller and Youngquist 1947 [Actinoceratidae]
- Flucticularia [Serpulimorpha]
- Fluctuaria [Linoproductidae]
- Flugopterus [Pachycormiformes]
- Flustra [Trepostomida]
- Flustrella, Ehrenberg 1838 [Spumellaria]
- Flustrella [Cheilostomata]
- Flustrellaria [Calloporidae]
- Foerstediscus, Bassler 1935 [Hemicystitidae]
- Foerstella [Lyssacinosida]
- Foerstellites, Kobayashi 1940 [Endoceratidae]
- Foersteoceras, Ruedemann 1925 [Brevicoceratidae]
- Foersteotheca [Novitatidae]
- Foerstephyllum, Bassler 1950 [Billingsariidae]
- Folina (Crosse 1868) [Neotaenioglossa]
- Folinia, Crosse 1868 [Rissoidae]
- Folioceras [Orthocerida]
- Foliomena, Havlicek 1952 [Foliomenidae]
- Follicalena [Calcarea]
- Folliceps, Opik 1970 [Trilobita]
- Follicrinus, Schmidt 1934 [Cladida]
- Follicucullus, Ormiston and Babcock 1979 [Follicucullidae]
- Follmannia [Pterioida]
- Fomichevia, Dubatolov 1959 [Parastriatoporidae]
- Fomichivella [Anthozoa]
- Fomitchella, Missarzhevsky in Rozanov 1969 [Problematica]
- Fontanelliceras, Fucini 1931 [Hildoceratidae]
- Fontannesia [Sonniniidae]
- Fontannesiella [Oppeliidae]
- Fontbotia [Foraminifera]
- Foordites, Wedekind 1918 [Pinacitidae]
- Foramenella [Palaeocopida]
- Foraripora [Ctenostomata]
- Foratiscala, de Boury 1887 [Epitoniidae]
- Forbescieras [Cephalopoda]
- Forbescythere [Podocopida]
- Forbesiocrinus [Sagenocrinida]
- Forcepia [Poecilosclerida]
- Forchhammeria, Lermontova and Chernysheva 1950 [Asaphida]
- Fordaspis, Lochman 1956 [Dorypygidae]
- Fordinia [Obolidae]
- Foremanella [Spumellaria]
- Foricula [Cyclostomata]
- Forillonaria, Lesperance 1975 [Phacopida]
- Forma [Strophomenida]
- Formagnostus, Ergaliev 1980 [Agnostida]
- Formanhelena [Spumellaria]
- Formonia, Richter 1928 [Proetida]
- Formosocyathus [Ajacicyathida]
- Formosulus [Myoida]
- Forolina [Stromatoporoidea]
- Forreria, Jousseaume 1880 [Neogastropoda]
- Forschia [Foraminifera]
- Forschiella [Foraminifera]
- Forsia [Neogastropoda]
- Forskaelena [Archaeogastropoda]
- Forthocrinus, Wright 1942 [Cladida]
- Fortipecten, Yabe and Hatai 1940 [Pectinidae]
- Fortunella, Calzada 1985 [Basiliolidae]
- Fossacallista, J.A. Marwick 1938 [Veneridae]
- Fossacypraea, Schilder 1939 [Cypraeidae]
- Fossaphyllia [Heterocorallia]
- Fossariopsis, Laube 1868 [Neritopsidae]
- Fossarius (Philippi 1841) [Neotaenioglossa]
- Fossarus, Philippi 1841 [Planaxidae]
- Fossaruus, Philippi 1841 [unclassified genus]
- Fossatrivia, Iredale 1931 [Triviidae]
- Fossatrypa [Punctatrypidae]
- Fossirichterina [Myodocopida]
- Fossopora, Etheridge 1903 [Theciidae]
- Fossoporella, Leleshus 1965 [Theciidae]
- Fossulites, Astre 1957 [Radiolitidae]
- Fossundecima [Phyllodocemorpha]
- Fosterella [Cirripedia]
- Foulonia, Pribyl and Vanek 1985 [Phacopida]
- Fournierechinus [Echinocystitoida]
- Fournierella [Cephalopoda]
- Fourtaunia [Brissidae]
- Foveaprimitella [Palaeocopida]
- Foveola, Gorjansky 1969 [Obolidae]
- Foveoleberis [Podocopida]
- Fractoceramus [Pterioida]
- Fragilicyathus [Archaeocyathida]
- Fragiscutum, Whittington and Campbell 1967 [Encrinuridae]
- Fragum, Ršding 1798 [Cardiidae]
- Frambocythere [Podocopida]
- Frammia, Holtedahl 1922 [Encrinuridae]
- Francesita [Foraminifera]
- Francocaris [Mysidacea]
- Francopora [Cheilostomata]
- Francovichia, Branisa 1960 [Dalmanitidae]
- Frankiella [Chonetidae]
- Frankites, E. T. Tozer 1971 [Trachyceratidae]
- Franklinella [Myodocopida]
- Franklinoceras, Flower 1957 [Ruedemannoceratidae]
- Fransuasaecyathus [Capsulocyathida]
- Frechastrea [Anthozoa]
- Frechella [Trigonotretidae]
- Frechiella [Hildoceratidae]
- Frechites, J. P. Smith 1932 [Beyrichitidae]
- Fredenia, Cadee and A.W. Janssen 1994 [Fasciolariidae]
- Fredericksia [Ingelarellidae]
- Freiastarte, Chavan 1952 [Astartidae]
- Freixialina [Mayncinidae]
- Freja, Liljedahl 1984 [Frejidae]
- Fremontoceras, Foerste 1935 [Apsidoceratidae]
- Freneixita [Pterioida]
- Freneixostrea [Pterioida]
- Frenguelliceras [Cephalopoda]
- Frenguelliella, A. F. Leanza 1942 [Laevitrigoniidae]
- Frenula [Zeilleriidae]
- Friedbergia, Rozkowska 1969 [Laccophyllidae]
- Frigichione [Cardiida]
- Frigidocardium, Habe 1951 [Cardiidae]
- Friginatica, Hedley 1916 [Naticidae]
- Frinalicyathus [Ajacicyathida]
- Fritchaspis, Vanek 1963 [Harpetidae]
- Frithjofia, Pribyl and Vanek 1978 [Proetida]
- Frogdenites [Otoitidae]
- Frognaspis, Nikolaisen 1965 [Ityophoridae]
- Frombachia [Cycloneritimorpha]
- Fromentellia, Ferry 1863 [Montlivaltiidae]
- Fromentelligyra, Alloiteau 1952 [Rhipidogyridae]
- Fromeophyllum [Anthozoa]
- Frondicularia, Defrance 1824 [Lagenidae]
- Frondiculinata [Foraminifera]
- Frondilina [Foraminifera]
- Frondina [Protonodosariidae]
- Frondipora [Frondiporidae]
- Frondovaginulina [Foraminifera]
- Frostiella [Podocopida]
- Fruehwirthia [Anthozoa]
- Frumentella [Fusulinoidea]
- Frurionella [Lepraliellidae]
- Fryxellodontus [Conodontophorida]
- Fuchouia, Resser and Endo 1935 [Dolichometopidae]
- Fuchungopora, Lin 1963 [Gorskyitidae]
- Fuciniceras, Haas 1913 [Hildoceratidae]
- Fueloepicythere [Podocopida]
- Fugleria, Reinhart 1937 [Arcidae]
- Fuhrbergiella [Podocopida]
- Fulcrella [Cardiida]
- Fulcriphoria [Proschizophoriidae]
- Fulgerca, L. W. Stephenson 1941 [Neogastropoda]
- Fulgoraria, Schumacher 1817 [Volutidae]
- Fulguroficus, Grabau 1904 [Ficidae]
- Fulgurofusus, Grabau 1904 [Turbinellidae]
- Fulpia, L. W. Stephenson 1946 [Corbiculidae]
- Fulvia, Gray 1853 [Cardiidae]
- Fundinia, Sladic-Trifunovic and Pejovic 1977 [Radiolitidae]
- Fungella [Cyclostomata]
- Fungia, Lamarck 1801 [Fungiidae]
- Fungia (Verrillofungia), Wells 1966 [Fungiidae]
- Fungiacara [Mytilida]
- Fungiacyathus, Sars 1872 [Fungiacyathidae]
- Fungiastraea, Alloiteau 1952 [Latomeandridae]
- Funginella, d'Orbigny 1849 [Funginellidae]
- Funginellastraea, Alloiteau 1952 [Fungiidae]
- Fungochitina [Rhizopodea]
- Fungocystites [Diploporita]
- Fungulodus [Conodontophorida]
- Funiscala, de Boury 1891 [Epitoniidae]
- Furacopyge, Aribazu 1978 [Phacopida]
- Furcacauda [Furcacudiformes]
- Furcacudiformes, order [Pteraspidomorphi]
- Furcalithus, Fortey and Owens 1987 [Trinucleidae]
- Furcitella, G. A. Cooper 1956 [Strophomenidae]
- Furnishina [Conodonta]
- Furnishius [Conodonta]
- Furo, Gistl 1848 [Furidae]
- Fursenkoina, d'Orbigny 1846 [Fursenkoinidae]
- Fusarchaias [Soritidae]
- Fuscibuccinum [Neogastropoda]
- Fuscinipyge, Ormiston 1972 [Proetidae]
- Fuscinites [Palaeocopida]
- Fuscinullina [Palaeocopida]
- Fuscocardium [Cardiida]
- Fuscoscala, Monterosato 1890 [Scalidae]
- Fusella, M'Coy 1844 [Strophopleuridae]
- Fusiaphera, Habe 1961 [Cancellariidae]
- Fusicellaria [Cheilostomata]
- Fusicoceras, Flower 1939 [Spyroceratidae]
- Fusiella [Schubertellidae]
- Fusiferella [Astrophorida]
- Fusiguraleus, Powell 1942 [Turridae]
- Fusimilis, L. W. Stephenson 1941 [Turridae]
- Fusimitra, Conrad 1855 [Mitridae]
- Fusinus, Rafinesque 1815 [Fasciolariidae]
- Fusiptyxis [Heterostrophia]
- Fusiteuthis [Belemnitida]
- Fusitoma [Neogastropoda]
- Fusiturricula, Woodring 1928 [Turridae]
- Fusiturris, Thiele 1929 [Turridae]
- Fusoficula, Sacco 1890 [Ficidae]
- Fusoidella, Wenz 1938 [Pseudomelaniidae]
- Fusoterebra [Neogastropoda]
- Fustiaria, Stoliczka 1868 [Fustiariidae]
- Fustichitina [Rhizopodea]
- Fusuconcharium [Problematica]
- Fusulina, Schellwien 1898 [Fusulinidae]
- Fusulinella, Moeller 1878 [Fusulinidae]
- Fusus, Bruguière 1789 [Strombidae]
- Futhystylus (Cossmann 1895) [Neotaenioglossa]
- Fuxianhuia, Hou 1987 [Fuxianhuiidae]
- Fyfea [Neogastropoda]
- Fylgia [Pterioida]
- Gabbioceras, Hyatt 1900 [Gaudryceratidae]
- Gablonzeria, Cuif 1976 [Gablonzeriidae]
- Gabonita [Foraminifera]
- Gabriceraurus, Pribyl and Vanek 1985 [Cheiruridae]
- Gabriellus [Olenellidae]
- Gabrielona, Iredale 1917 [Phasianellidae]
- Gabrielsocyathus [Archaeocyathida]
- Gadella, Lowe 1843 [Gadiformes]
- Gadiculus, Guichenot 1850 [Gadidae]
- Gadiformes, order, Goodrich 1909 [Actinopteri]
- Gadila, Gray 1847 [Gadilidae]
- Gadilina, Foresti 1895 [Gadilinidae]
- Gadomus, Regan 1903 [Gadiformes]
- Gaetanoceras, Ruzhencev 1938 [Agathiceratidae]
- Gafrarium, Ršding 1798 [Veneridae]
- Gagaria, Duncan 1889 [Temnopleuroida]
- Gagarinicyathus [Ajacicyathida]
- Gagaticeras [Echioceratidae]
- Gaidropsarus, Rafinesque 1810 [Gadiformes]
- Gaimardia, Gould 1852 [Gaimardiidae]
- Galahetes [Trilobita]
- Galateacrinus, Moore 1940 [Texacrinidae]
- Galateastrophia [Strophodontidae]
- Galathea, Fabricius 1793 [Galatheidae]
- Galaticeras [Lytoceratidae]
- Galaxea, Oken 1815 [Oculinidae]
- Galbanites [Cephalopoda]
- Galeanella [Milioliporidae]
- Galeaspis, Ivshin 1955 [Ptychopariida]
- Galeaster [Holasteridae]
- Galeatagypa [Gypidulidae]
- Galeatathyris [Athyrididae]
- Galeatella [Productidae]
- Galeatellina, Sapelnikov and Rukavishnikova 1975 [Virgianidae]
- Galene, De Haan 1833 [Galenidae]
- Galenocaris [Thylacocephala]
- Galenopsis, A. Milne-Edwards 1865 [Pilumnidae]
- Galeocerdo, Müller and Henle 1837 [Carcharhinidae]
- Galeodaria, Conrad 1865 [Cassidae]
- Galeodea, Link 1807 [Cassidae]
- Galeodea (Gomphopages), Gardner 1939 [Cassidae]
- Galeodina, Monterosato 1884 [Rissoidae]
- Galeodinopsis, Sacco 1895 [Rissoidae]
- Galeograptus [Tuboidea]
- Galeola [Holasteroida]
- Galeolaria [Serpulimorpha]
- Galeoocorys, Kuroda and Habe 1957 [Cassidae]
- Galeopsis [Ostracoda]
- Galeopsis [Cheilostomata]
- Galeraster [Conulidae]
- Galericulus, Seeley 1861 [Gastropoda]
- Galeroclypeus [Echinoidea]
- Galeropsis [Neogastropoda]
- Galeropygus [Galeropygidae]
- Galerosaukia, Shergold 1975 [Asaphida]
- Galeus, Schaeffer 1760 [Scyliorhinidae]
- Galicornus [Hyolithida]
- Gallagnostus, Howell 1935 [Peronopsidae]
- Galliaecystis [Cornuta]
- Galliaecytheridea [Podocopida]
- Galliennithyris [Postepithyrididae]
- Galliherina [Foraminifera]
- Gallitellia [Foraminifera]
- Gallitellia, Cuif 1977 [Scleractinia]
- Gallowaiina, Chen 1934 [Schubertellidae]
- Galtoceras, Foerste 1934 [Acleistoceratidae]
- Galwayella, Patterson and Pettis 1986 [Ellipsolagenidae]
- Gamachignathus [Ozarkodinida]
- Gammacythere [Podocopida]
- Gammarocrinites, Quenstedt 1857 [Cyrtocrinida]
- Gammascolex [Palaeoscolecida]
- Gamonedaspis, Branisa and Vanek 1973 [Dalmanitidae]
- Gamonetes [Chonetidae]
- Gamopleura [Thecosomata]
- Gamphalosia [Leptostrophiidae]
- Gampsurus, Von der Marck 1863 [Decapoda]
- Ganbirretia [Holasteridae]
- Gandinella [Ammodiscidae]
- Ganella [Foraminifera]
- Ganesa [Archaeogastropoda]
- Gangadharites, C. Diener 1916 [Beyrichitidae]
- Gangamophyllum, Gorskiy 1938 [Axophyllidae]
- Gangshanoceras, X. P. Zou 1988 [Proteoceratidae]
- Ganiella [Cystoporata]
- Ganinella, Elkin 1968 [Proetida]
- Ganloudina [Protoconodontida]
- Gannibeyrichia [Palaeocopida]
- Ganoessus [Clupeidae]
- Ganopristis, Arambourg 1935 [Sclerorhynchidae]
- Ganorhynchus, Traquair 1873 [Dipteridae]
- Gansserina [Foraminifera]
- Gansuella [Cardiida]
- Ganxiella [Cardiida]
- Gaofengophyllum [Anthozoa]
- Gaoqiaioella [Arthropoda]
- Gaotanaspis, Zhang and Li 1984 [Ptychopariida]
- Gaotania, Chang 1974 [Odontopleuridae]
- Gapeevella, Gandl 1987 [Proetida]
- Gapparodus [Protoconodontida]
- Garantella [Foraminifera]
- Garantiana [Cephalopoda]
- Gardinerichthys [Palaeonisciformes]
- Gardineroseris, Scheer and Pillai 1974 [Agariciidae]
- Gardnerella, Chavan 1951 [Lucinidae]
- Gargania [Archaeogastropoda]
- Gargantua [Microporidae]
- Gari, Schumacher 1817 [Psammobiidae]
- Garniella [Palaeocopida]
- Garniericeras, Spath 1924 [Cephalopoda]
- Garnierisphinctes [Cephalopoda]
- Garnotia, Gray 1867 [Calyptraeidae]
- Garnuella [Podocopida]
- Garraconularia [Scyphozoa]
- Garraspongia [Demospongea]
- Garryoceras, Foerste 1928 [Orthocerida]
- Garum [Psammobiidae]
- Garumnaster [Holasteridae]
- Gasconsia, Northrop 1939 [Trimerellidae]
- Gasconsoceras, Foerste 1936 [Barrandoceratidae]
- Gashaomiaoia, Rong Su and Li 1983 [Gypidulidae]
- Gaspespongia [Calcarea]
- Gaspocyrtoceras, Foerste 1936 [Paraphragmitidae]
- Gasteroclupea, Signeux 1964 [Clupeiformes]
- Gasterocoma, Goldfuss 1839 [Gasterocomidae]
- Gasterorhamphosus, Sorbini 1981 [Gasterosteiformes]
- Gasterosteiformes, order [Actinopteri]
- Gastrana, Schumacher 1817 [Tellinidae]
- Gastranopsis [Cardiida]
- Gastreochrea, Val'kov 1982 [Trilobozoa]
- Gastrioceras, Hyatt 1884 [Gastrioceratidae]
- Gastroammina [Saccamminidae]
- Gastrobelus [Belemnitida]
- Gastrochaena, Spengler 1783 [Gastrochaenidae]
- Gastrochaenopsis [Myoida]
- Gastroconus [Hydroconozoa]
- Gastrocrinus, Jaekel 1895 [Cladida]
- Gastrodetoechia [Leiorhynchidae]
- Gastrodorus, H. von Meyer 1864 [Homolidae]
- Gastropella [Cheilostomata]
- Gastroplites [Hoplitidae]
- Gastropoda, class, G. Cuvier 1797 [Mollusca]
- Gastropolus, Whittard 1966 [Cyclopygidae]
- Gastrosacus, Von Meyer 1851 [Galatheidae]
- Gatagacyathus [Archaeocyathida]
- Gattendorfia, Schindewolf 1920 [Gattendorfiidae]
- Gattenpleura, Weyer 1976 [Gattendorfiidae]
- Gaudryanella [Cheilostomata]
- Gaudryceras, de Grossouvre 1894 [Gaudryceratidae]
- Gaudryella, Patterson 1970 [Actinopteri]
- Gaudryina, d'Orbigny 1839 [Verneuilinidae]
- Gaudryinella [Foraminifera]
- Gaudryinoides [Foraminifera]
- Gaudryinopsis [Foraminifera]
- Gaulocrinus [Sagenocrinida]
- Gaurites, Bogoslovsky 1984 [Auguritidae]
- Gaurocrinus, Miller 1883 [Diplobathrida]
- Gauthieria, Lambert 1891 [Phymosomatidae]
- Gauthiericeras, de Grossouvre 1894 [Collignoniceratidae]
- Gauthiosoma [Echinoidea]
- Gavelinella [Gavelinellidae]
- Gavelinopsis, Hofker 1951 [Rosalinidae]
- Gavialinum, Lortet 1892 [Teleosauridae]
- Gaynaphyllum, Pedder 1980 [Ptenophyllidae]
- Gazacrinus, Miller 1892 [Diplobathrida]
- Gazameda, Iredale 1924 [Turritellidae]
- Gazdaganites [Cephalopoda]
- Gazimuria, Spasskiy 1960 [Anthozoa]
- Gazolapodus, Blot 1981 [Anguilliformes]
- Gazza, Rueppell 1835 [Perciformes]
- Gdowia [Merostomata]
- Gebeckeria [Palaeocopida]
- Gebia [Decapoda]
- Geffenina [Knoxitidae]
- Geffenites [Palaeocopida]
- Gegania, Jeffreys 1884 [Mathildidae]
- Gegenella [Meekellidae]
- Geintzina [Foraminifera]
- Geisina [Knoxitidae]
- Geisonoceras, Hyatt 1884 [Geisonoceratidae]
- Geisonocerina [Orthocerida]
- Geisonoceroides, Flower 1939 [Spyroceratidae]
- Geisopora [Cheilostomata]
- Geitonoceras [Nautilida]
- Geitonograptus [Graptoloidea]
- Gelagna, Schaufuss 1869 [Ranellidae]
- Gelasene, Palmer 1968 [Trilobita]
- Gelidicella [Ostracoda]
- Gelidorthina [Giraldiellidae]
- Gelidorthis [Giraldiellidae]
- Gellensia [Palaeocopida]
- Geloina, Gray 1840 [Corbiculidae]
- Geltena, L. W. Stephenson 1946 [Mactridae]
- Gemaspira [Neogastropoda]
- Gemellaria [Cheilostomata]
- Gemellides [Foraminifera]
- Gemellipora [Schizoporellidae]
- Gemelliporella [Gemelliporellidae]
- Gemelliporidra [Cheilostomata]
- Gemelliporina [Cheilostomata]
- Gemerithyris [Zeilleriidae]
- Geminella [Cheilostomata]
- Geminospira [Foraminifera]
- Gemma, Deshayes 1853 [Veneridae]
- Gemmacrinus, Prokop and Petr 1989 [Crinoidea]
- Gemmarcula [Terebrataliidae]
- Gemmaterebra [Neogastropoda]
- Gemmellarocarcinus, Checchia-Rispoli 1905 [Decapoda]
- Gemmellaroceras, Hyatt 1900 [Polymorphitidae]
- Gemmellaroia [Heterostrophia]
- Gemmellaroia (Gemmellaroiella), Mabuti 1937 [Gemmellaroiidae]
- Gemmellaroialla (Mabuti 1937) [Gemmellaroiidae]
- Gemmoliva [Neogastropoda]
- Gemmuloborsonia [Neogastropoda]
- Gempylus, Cuvier 1829 [Perciformes]
- Gemuendenaspis, Miles 1962 [Arthrodira]
- Gemuendina, Traquair 1903 [Galeidae]
- Gemuendolepis, Gross 1973 [Acanthodii]
- Genabacia, Milne-Edwards and Haime 1849 [Microsolenidae]
- Genaxinus, Iredale 1930 [Thyasiridae]
- Gendrotella [Mayncinidae]
- Genevievella, Lochmann 1936 [Llanoaspididae]
- Genicularia [Serpulimorpha]
- Geniculatus [Conodontophorida]
- Geniculicyathus [Ajacicyathida]
- Geniculifera [Productellidae]
- Geniculigypa [Gypidulidae]
- Geniculina, Roomusoks 1993 [Strophomenidae]
- Geniculomclearnites [Amphistrophiidae]
- Genkaimurex, Kuroda 1953 [Neogastropoda]
- Gennaeocrinus, Wachsmuth and Springer 1881 [Periechocrinitidae]
- Gentilapsis [Trilobita]
- Gentilia [Archiaciidae]
- Gentoniceras [Acanthoceratidae]
- Genuclymenia, Wedekind 1908 [Cymaclymeniidae]
- Genyonemus, Gill 1862 [Sciaenidae]
- Genypterus, Philippi 1857 [Ophidiidae]
- Geocyathus [Ajacicyathida]
- Geodia, Lamarck 1815 [Geodiidae]
- Geodites [Astrophorida]
- Geoffbondia [Cardiida]
- Geopeltis, van Regteren Altena 1949 [Teuthida]
- Georgethyris [Reticulariidae]
- Georgia, Bourguignat 1882 [Pomatiasidae]
- Georgina, Wade 1977 [Actinocerida]
- Georgioceras [Cephalopoda]
- Geosaurus, G. Cuvier 1824 [Metriorhynchidae]
- Geoteuthinus, Kretzoi 1942 [Teuthida]
- Gephyroberyx, Boulenger 1902 [Trachichthyidae]
- Gephyrophora [Gigantoporidae]
- Gephyrotes [Cribrilinidae]
- Geragnostella, Kobayashi 1939 [Metagnostidae]
- Geragnostus, Howell 1935 [Metagnostidae]
- Geraldinella [Archaeaspididae]
- Geranocephalus [Stringocephalidae]
- Geraocrinus, Ulrich 1924 [Anomalocrinidae]
- Gerastos, Goldfuss 1843 [Proetidae]
- Geratrigonia [Trigoniidae]
- Gerbeckites [Podocopida]
- Gergovia, Cossmann 1899 [Cancellariidae]
- Gerkeina [Ichthyolariidae]
- Gerkispira [Gerkispiridae]
- Gerlus [Pterioida]
- Germariceras, Breistroffer 1947 [Collignoniceratidae]
- Geroldicrinus [Sagenocrinida]
- Gerolsteinites [Reticulariidae]
- Gerothyris [Reticulariidae]
- Gerres, Quoy and Gaimard 1824 [Perciformes]
- Gerrhynx [Hebetoechiidae]
- Gerronodictyon, Bogoyavlenskaya 1969 [Gerronostromatidae]
- Gerronostroma, Yavorsky 1931 [Gerronostromatidae]
- Gerthia, Grabau 1928 [Polycoeliidae]
- Gertholites, Sokolov 1955 [Pachyporidae]
- Gerubiella [Ostracoda]
- Gervillaria, Cox 1951 [Bakevelliidae]
- Gervilleiogoma [Pterioida]
- Gervilleioperna, Krumbeck 1923 [Malleidae]
- Gervillella, Waagen 1907 [Bakevelliidae]
- Gervilletia [Pterioida]
- Gervillia, Defrance 1820 [Bakevelliidae]
- Geryon [Decapoda]
- Gesoriacula [Podocopida]
- Gevanites, A. Parnes 1975 [Hungaritidae]
- Gevreya, Moret 1927 [Cribrospongiidae]
- Geyerella [Meekellidae]
- Geyeroceras, Hyatt 1900 [Phylloceratidae]
- Geyeronaotia [Anthozoa]
- Geyerophyllum, Heritsch 1936 [Geyerophyllidae]
- Gharbouria, Gayet 1988 [Salmoniformes]
- Gheorghianina [Nubeculariidae]
- Giandites [Palaeocopida]
- Gibba [Palaeocopida]
- Gibbaster [Micrasteridae]
- Gibbechinorhinus, Cappetta 1990 [Squaliformes]
- Gibberella, Abushik 1958 [Leperditiidae]
- Gibberlebeis [Podocopida]
- Gibberostrophia [Leptostrophiidae]
- Gibberula, Swainson 1840 [Cystiscidae]
- Gibberulina, Monterosato 1884 [Cystiscidae]
- Gibbithyris [Gibbithyrididae]
- Gibbochonetes [Rugosochonetidae]
- Gibboconcha [Bivalvia]
- Gibbolucina, Cossmann 1904 [Lucinidae]
- Gibbomodiola [Mytilida]
- Gibbula, Risso 1826 [Trochidae]
- Gibbula (Colliculus), Monterosato 1888 [Trochidae]
- Giganticlavus [Isorophida]
- Gigantocapulus, Hayami and Kanie 1980 [Gigantocapulidae]
- Gigantocypraea (Schilder 1927) [Cypraeidae]
- Gigantogonia, Cossmann 1909 [Coelostylinidae]
- Gigantopecten [Pectinidae]
- Gigantopora [Gigantoporidae]
- Gigantoproductus [Monticuliferidae]
- Gigantopygus, Hupe 1952 [Redlichiida]
- Gigantorhynchus, V. P. Sapelnikov and A. A. Malygina 1977 [Leiorhynchidae]
- Gigasbia [Foraminifera]
- Gigmpeltis [Trilobita]
- Gignouxia [Demospongea]
- Gigoutella, Hupe 1953 [Trilobita]
- Gilbertharrisella [Cardiida]
- Gilbertina, Morlett 1888 [Cephalaspida]
- Gilbertsocrinus, Phillips 1836 [Rhodocrinidae]
- Gilbertsonia [Pholadomyida]
- Gilbertturricula [Neogastropoda]
- Gillastraea, Melnikova 1983 [Cuifastraeidae]
- Gillatia, Opik 1953 [Palaeocopida]
- Gillcarcinus, Collins and Morris 1978 [Chasmocarcinidae]
- Gillechinus [Brissidae]
- Gillettia [Corallistidae]
- Gillicus [Saurodontidae]
- Gillidia, Eastman 1914 [Perciformes]
- Gilmocrinus, Lauden 1933 [Scytalocrinidae]
- Gilsonicaris [Branchiopoda]
- Ginebis, Taki and Otuka 1942 [Archaeogastropoda]
- Ginella [Ostracoda]
- Ginginella [Podocopida]
- Ginglymostoma, Müller and Henle 1838 [Ginglymostomatidae]
- Ginkgospongia [Demospongea]
- Ginospina [Chancelloriida]
- Ginsburgia [Salmoniformes]
- Giordanella, Bornemann 1891 [Trilobita]
- Gipsella [Ostracoda]
- Giraffospyris, Haeckel 1881 [Triospyrididae]
- Giraliapecten [Pectinidae]
- Giraliarella [Hyperamminoididae]
- Giraliaster [Holasteroida]
- Girandia, Kobayashi 1943 [Corynexochida]
- Girardevia [Merostomata]
- Girardotia [Pholadomyida]
- Girlasia (de Gregorio 1930) [Aulostegidae]
- Girtycoelia, King 1933 [Girtyocoeliidae]
- Girtyella, Weller 1911 [Cranaenidae]
- Girtyoceras, Wedekind 1918 [Girtyoceratidae]
- Girtyopora [Fenestrata]
- Girtyoporina [Fenestrata]
- Girvanicystis [Soluta]
- Girvanopyge, Kobayashi 1960 [Cyclopygidae]
- Gisilina, Steinich 1963 [Chlidonophoridae]
- Gisortia, Jousseaume 1884 [Cypraeidae]
- Gispyrella, Laws 1937 [Pyramidellidae]
- Gissarina [Retziellidae]
- Gissarophyllum, Lavrusevich 1964 [Paliphyllidae]
- Gissocrinus, Angelin 1878 [Cyathocrinitidae]
- Gitarra, Gandl 1968 [Proetida]
- Gitolampas [Pliolampadidae]
- Gitonia [Serpulimorpha]
- Gjelispinifera, Ivanova 1975 [Reticulariinidae]
- Glabella, Swainson 1840 [Marginellidae]
- Glabellacythere [Podocopida]
- Glaberagnostus, Romanenko 1985 [Agnostida]
- Glabratella [Glabratellidae]
- Glabratellina [Glabratellidae]
- Glabrophysodoceras [Cephalopoda]
- Glabropilumus [Decapoda]
- Gladigondolella [Conodontophorida]
- Gladiobranchus, Bernacsek and Dineley 1977 [Acanthodii]
- Gladioscutum [Ostracoda]
- Gladiostrophia [Amphistrophiidae]
- Glamocites, C. Diener 1917 [Sandlingitidae]
- Glandulina, d'Orbigny 1826 [Glandulinidae]
- Glandulinoides [Foraminifera]
- Glandulopleurostomella [Foraminifera]
- Glans, Mühfeld 1811 [Carditidae]
- Glansicystis, Paul 1967 [Rhombifera]
- Glaphurella, Dean 1971 [Raymondinidae]
- Glaphurina, Ulrich 1930 [Glaphuridae]
- Glaphurochiton [Neoloricata]
- Glaphurus, Raymond 1905 [Glaphuridae]
- Glaphyocrinus [Monobathrida]
- Glaphyraspis, Resser 1937 [Lonchocephalidae]
- Glaphyrina, Finlay 1926 [Fasciolariidae]
- Glaphyrites, Ruzhencev 1936 [Glaphyritidae]
- Glaphyrocystis, Jaekel 1899 [Rhombifera]
- Glarichelys, Zangerl 1958 [Cheloniidae]
- Glassia, Davidson 1881 [Glassiidae]
- Glassina, Hall and Clarke 1893 [Athyrididae]
- Glassoceras, Ruzhencev 1960 [Vidrioceratidae]
- Glatziella, Renz 1914 [Glatziellidae]
- Glaucocrinus, Parks and Alcock 1912 [Crinoidea]
- Glaucolithites [Cephalopoda]
- Glauconia, Stoliczka 1868 [Cassiopidae]
- Glauconiella, Akopyan 1976 [Cassiopidae]
- Glauconomella, Bassler 1952 [Arthrostylidae]
- Glaucosoma, Temminck and Schlegel 1843 [Perciformes]
- Glaukosocrinus, Strimple 1951 [Decadocrinidae]
- Glazewskia [Thecideidae]
- Glenaraea [Meandrinidae]
- Glenisteroceras, Flower 1957 [Sactorthoceratidae]
- Glenodictyum [Porifera]
- Glenotremites, Goldfuss 1829 [Comatulida]
- Gleviceras, Buckman 1918 [Oxynoticeratidae]
- Glezeria [Palaeocopida]
- Glibertia [Cardiida]
- Glimmatobolbina [Palaeocopida]
- Gloassamyophorous [Hippuritida]
- Globacrocrinus, Moore and Strimple 1969 [Monobathrida]
- Globanomalina [Foraminifera]
- Globatrypa [Lissatrypidae]
- Globiconcha, d'Orbigny 1843 [Cephalaspida]
- Globicuniculus [Foraminifera]
- Globiella [Monticuliferidae]
- Globigerapsis [Foraminifera]
- Globigerina, d'Orbigny 1826 [Globigerinidae]
- Globigerinatella, Cushman and Stainforth 1945 [Globigerinidae]
- Globigerinatheka [Foraminifera]
- Globigerinella [Foraminifera]
- Globigerinelloides [Globigerinelloididae]
- Globigerinita, Bronnimann 1951 [Globigerinidae]
- Globigerinoides, Cushman 1927 [Globigerinidae]
- Globigerinoidesella [Foraminifera]
- Globigerinoita [Foraminifera]
- Globigerinopsis [Foraminifera]
- Globigerinopsoides [Foraminifera]
- Globimorphina [Foraminifera]
- Globiomorpha [Neotaenioglossa]
- Globisinum, Marwick 1924 [Naticidae]
- Globispirifer [Martiniidae]
- Globispiroplectamminha [Foraminifera]
- Globithyris [Rhipidiothyrididae]
- Globivalvulina, Schubert 1921 [Biseriamminidae]
- Globivenus, Coen 1934 [Veneridae]
- Globoblastus, G. Hambach 1903 [Spiraculata]
- Globobulimina [Buliminidae]
- Globocardium, Hayami 1965 [Cardiidae]
- Globocassidulina, Voloshinova 1960 [Cassidulinidae]
- Globochernella [Foraminifera]
- Globoconusa [Foraminifera]
- Globodrillia [Neogastropoda]
- Globoendothyra [Endothyridae]
- Globofissurella [Foraminifera]
- Globoquadrina, Finlay 1947 [Globigerinidae]
- Globoreticulina [Soritidae]
- Globorilida, order, Syssoiev 1957 [Calyptoptomatida]
- Globorilus, Syssoiev 1958 [Globorilidae]
- Globoritubulus [Globorilida]
- Globorosalina [Foraminifera]
- Globorotalia, Cushman 1927 [Globorotaliidae]
- Globorotalia (Turborotalia), Cushman and Burmudez 1949 [unclassified subgenus]
- Globorotalites [Foraminifera]
- Globorotaloides [Globorotaliidae]
- Globosochonetes [Anopliidae]
- Globosoproductus [Monticuliferidae]
- Globospirillina [Foraminifera]
- Globostroma [Sphaeractinida]
- Globotetrataxis [Foraminifera]
- Globotruncana [Globotruncanidae]
- Globotruncanella [Globotruncanidae]
- Globotruncanita [Foraminifera]
- Globoturborotalita, Hofker 1976 [Globigerinidae]
- Globularia, Swainson 1840 [Ampullinidae]
- Globulaspis, Reed 1931 [Odontopleurida]
- Globuligerina [Foraminifera]
- Globulina, d'Orbigny 1839 [Polymorphinidae]
- Globulipora [Cyclostomata]
- Globulirhynchia [Pugnacidae]
- Globulospinella [Foraminifera]
- Globusia, H. Osmolska 1973 [Proetidae]
- Glochiceras, Hyatt 1900 [Oppeliidae]
- Glomalveolina [Alveolinidae]
- Glomodiscus [Archaediscidae]
- Glomospira, Rzehak 1895 [Ammodiscidae]
- Glomospiranella [Foraminifera]
- Glomospirella, Plummer 1945 [Ammodiscidae]
- Glomospiroides [Foraminifera]
- Glomotrocholina [Foraminifera]
- Gloria, Egorova and Savitsky 1968 [Ptychopariida]
- Gloriosocyathus [Ajacicyathida]
- Gloripallium, Iredale 1939 [Pectinidae]
- Glosia, Cossmann 1921 [Dialidae]
- Glossella, Cooper 1956 [Obolidae]
- Glosshypothyridina [Hypothyridinidae]
- Glossinotoechia [Glossinotoechiidae]
- Glossinulina [Hebetoechiidae]
- Glossinulinirhynchia [Hebetoechiidae]
- Glossinulus [Glossinotoechiidae]
- Glossites, Hall 1885 [Modiomorphidae]
- Glossoceras, Barrande 1865 [Ascoceratidae]
- Glossocrinus, W. Goldring 1923 [Glossocrinidae]
- Glossograptus [Graptoloidea]
- Glossoleptaena, Havlicek 1967 [Rafinesquinidae]
- Glossomorphites, Hessland 1953 [Palaeocopida]
- Glossopleura, Poulsen 1927 [Dolichometopidae]
- Glossorthis, Öpik 1930 [Productorthidae]
- Glossothyropsis [Notothyrididae]
- Glossotrypa [Stenolaemata]
- Glossus, Poli 1795 [Glossidae]
- Glottidia, Dall 1870 [Lingulidae]
- Glottoptychinites [Cephalopoda]
- Glubokoevella [Foraminifera]
- Glycera [Phyllodocemorpha]
- Glycerites [Phyllodocemorpha]
- Glycobtrys [Nassellaria]
- Glycydonta [Cardiida]
- Glycymerella, Woodring 1925 [Glycymerididae]
- Glycymeris, Da Costa 1778 [Glycymerididae]
- Glycymerita, Finlay and Marwick 1937 [Glycymerididae]
- Glymmatobolbina, Harris 1957 [Palaeocopida]
- Glyphanodus, Davis 1883 [Petalodontidae]
- Glypharthrus, Raasch 1939 [Aglaspididae]
- Glyphaspellus, Ivshin 1952 [Asaphida]
- Glyphaspis, Poulson 1927 [Anomocarellidae]
- Glyphea, Von Meyer 1835 [Glypheidae]
- Glyphidites [Thisbitidae]
- Glyphiteuthis, Reuss 1855 [Teuthida]
- Glyphithyreus, W. S. Macleay 1838 [Panopeidae]
- Glyphocyphus [Glyphocyphidae]
- Glyphopeltis, Deiss 1939 [Asaphida]
- Glyphopneustes [Hyposaleniidae]
- Glyphostoma, Gabb 1872 [Conidae]
- Glyphostomella [Foraminifera]
- Glyptacrothele [Acrothelidae]
- Glyptagnostus, Whitehouse 1936 [Agnostidae]
- Glyptambon, Holloway 1981 [Dalmanitidae]
- Glyptambonites, Cooper 1956 [Leptellinidae]
- Glyptarpites [Hildoceratidae]
- Glyptaspis, Newberry 1890 [Arthrothoraci]
- Glyptechinus [Temnopleuridae]
- Glypterina, Boucot 1970 [Orthida]
- Glyptias, Walcott 1901 [Botsfordiidae]
- Glypticus [Arbaciidae]
- Glyptoactis, Stewart 1930 [Carditidae]
- Glyptoactis (Claibornicardia), Stenzel and Krause 1957 [Carditidae]
- Glyptoactis (Fasciculicardia), Maxwell 1969 [Carditidae]
- Glyptoceras [Cephalopoda]
- Glyptochelone, Dollo 1903 [Cheloniidae]
- Glyptochiton [Neoloricata]
- Glyptochrysalis, Koken 1896 [Coelostylinidae]
- Glyptocidaris, A. Agassiz 1853 [Phymosomatidae]
- Glyptoconularia [Scyphozoa]
- Glyptoconus [Conodontophorida]
- Glyptocrinus, Hall 1847 [Monobathrida]
- Glyptocystites, Billings 1854 [Rhombifera]
- Glyptocythere [Podocopida]
- Glyptodendron, Claypole 1878 [Westonoceratidae]
- Glyptodynomene, Van Straelen 1944 [Decapoda]
- Glyptogatocythere [Podocopida]
- Glyptograptus [Retiolitidae]
- Glyptogypa [Gypidulidae]
- Glyptolichvinella [Podocopida]
- Glyptomena, Cooper 1956 [Glyptomenidae]
- Glyptometopus, Rasetti 1944 [Ptychopariida]
- Glyptophidium, Alcock 1889 [Ophidiiformes]
- Glyptopleurella [Palaeocopida]
- Glyptopleurina [Knoxitidae]
- Glyptopleuroides [Palaeocopida]
- Glyptopomus, Agassiz 1844 [Osteolepidae]
- Glyptopora [Cystoporata]
- Glyptorthis, Foerste 1914 [Glyptorthidae]
- Glyptosceptron [Pennatulacea]
- Glyptosphaerites, Müller 1854 [Glyptosphaeritidae]
- Glyptosphaeronites [Diploporita]
- Glyptospirifer [Echinospiriferidae]
- Glyptostromoides, Stearn 1983 [Stromatoporidae]
- Glyptostyla [Fasciolariidae]
- Glyptotoma, Casey 1904 [Neogastropoda]
- Glyptotrophia [Huenellidae]
- Glyptoxoceras, Spath 1925 [Diplomoceratidae]
- Glyptozaria, Iredale 1924 [Turritellidae]
- Gmelinmagas, Mariñelarena 1964 [Terebratellidae]
- Gnaltacyathus [Ajacicyathida]
- Gnathoberyx, Patterson 1967 [Beryciformes]
- Gnathodus [Idiognathodontidae]
- Gnathophis, Kaup 1860 [Congridae]
- Gnathosaurus, Meyer 1833 [Reptilia]
- Gnidiella, P. Parker 1949 [Veneridae]
- Gnorimocrinus, Wachsmuth and Springer 1879 [Taxocrinida]
- Gobiella [Trigoniida]
- Gochtia [Problematica]
- Goesella [Foraminifera]
- Goethemia [Cardiidae]
- Gogia, Walcott 1917 [Eocrinidae]
- Gogiida, order, Broadhead 1982 [Eocrinoidea]
- Gogiura, Rozova and Dubatolova 1985 [Asaphida]
- Gogoceras, Becker et al. 1993 [Ponticeratidae]
- Gogoella, Legg 1976 [Trilobita]
- Golcocythere [Podocopida]
- Golcondella [Ostracoda]
- Goldfussitrypa [Cryptostomata]
- Goldringia, Flower 1945 [Rutoceratidae]
- Goleocrinus, Strimple and Watkins 1969 [Dendrocrinida]
- Goliathiceras, Buckman 1919 [Cardioceratidae]
- Goliathites [Cardioceratidae]
- Gombertiphyllia [Scleractinia]
- Gomphacanthus, Davis 1884 [Janassidae]
- Gomphina, Mörch 1853 [Veneridae]
- Gomphinella [Veneridae]
- Gomphites [Hadromerida]
- Gomphoceras, Sowerby 1839 [Oncocerida]
- Gomphocystites, Hall 1864 [Gomphocystitidae]
- Gompholepis [Pteraspidomorphi]
- Gompholites [Hyolithida]
- Gomphomarcia [Cardiida]
- Gomphonchus, Gross 1971 [Climatiiformes]
- Gonambonites, Pander 1830 [Gonambonitidae]
- Gonamispongia [Hexactinellida]
- Gonathyris [Athyrididae]
- Gonatocaris [Archaeostraca]
- Gonatocyrtoceras, Foerste 1926 [Acleistoceratidae]
- Gonatodus, Traquair 1877 [Palaeoniscidae]
- Gonatosphaera [Nodosariidae]
- Gondolella, Stauffer and Plummer 1932 [Ozarkodinida]
- Gondolina, Jin and Liao 1966 [Aulostegidae]
- Gondwanella [Pterioida]
- Gongrochanus [Faujasiidae]
- Gongrocrinus, Burdick and Strimple 1982 [Crinoidea]
- Gongylospongia [Reticulosa]
- Gongylostonyx [Palaeocopida]
- Gongylothorax, Foreman 1968 [Sethocapsidae]
- Goniada [Phyllodocemorpha]
- Goniagnostus, Howell 1935 [Ptychagnostidae]
- Goniastrea, Milne-Edwards and Haime 1848 [Merulinidae]
- Goniatites, Haan 1825 [Goniatitidae]
- Goniatitida, order, Hyatt 1884 [Cephalopoda]
- Goniatogyra, Cossmann 1921 [Hydrobiidae]
- Gonilia [Cardiida]
- Gonimyrtea, Marwick 1929 [Lucinidae]
- Goniocardium [Cardiida]
- Gonioceras, Hall 1847 [Gonioceratidae]
- Goniochasma, Meek 1864 [Pholadidae]
- Goniochirus, Etallon 1861 [Paguridae]
- Goniocidaris, Desor, in Agassiz & Desor 1846 [Cidaroida]
- Goniocladia [Goniocladiidae]
- Goniocladiella [Cystoporata]
- Gonioclymenia, Hyatt 1884 [Gonioclymeniidae]
- Gonioconcha, Bonarelli 1921 [Thiaridae]
- Goniocora, Milne-Edwards and Haime 1851 [Stylinidae]
- Goniocornus [Hyolithida]
- Goniocrinus, Miller and Gurley 1890 [Cladida]
- Goniocylichna, B. Wade 1926 [Acteocinidae]
- Goniocylindrites, Meek 1863 [Cylindrobullinidae]
- Goniocypoda, Woodward 1867 [Hexapodidae]
- Goniodostomia [Heterostrophia]
- Goniodromites, A. Reuss 1858 [Goniodromitidae]
- Goniograptus, McCoy 1876 [Graptoloidea]
- Gonioloboceras, Hyatt 1900 [Gonioloboceratidae]
- Goniomya, Agassiz 1842 [Pholadomyidae]
- Gonionaedyceras, Flower 1945 [Brevicoceratidae]
- Gonionautilus, Mojsisovics 1902 [Gonionautilidae]
- Gonionotites, Gemmellaro 1904 [Juvavitidae]
- Goniophora, Phillips 1848 [Modiomorphidae]
- Goniophoria [Rhynchotetradidae]
- Goniophyllum, Milne-Edwards and Haime 1850 [Goniophyllidae]
- Goniopora, Blainville 1830 [Poritidae]
- Gonioptyxis [Neogastropoda]
- Goniopygus, L. Agassiz 1838 [Arbaciidae]
- Gonioseris, Duncan 1872 [Calamophylliidae]
- Goniosigma [Temnopleuridae]
- Goniosteus, Gross 1933 [Ptyctodontida]
- Goniotelina, Whittington and Ross 1953 [Bathyuridae]
- Gonioteloides, Kobayashi 1955 [Proetida]
- Gonioteuthis [Belemnitida]
- Goniothyropsis [Muirwoodellidae]
- Goniotrypa [Cryptostomata]
- Goniporus, Gross 1967 [Katoporididae]
- Gonodactylus [Stomatopoda]
- Gonolkites [Parkinsoniidae]
- Gonoplax, Leach 1814 [Goneplacidae]
- Gonorhynchiformes, order [Actinopteri]
- Gonostoma, Rafinesque 1810 [Gonostomatidae]
- Gonzagia [Heterostrophia]
- Gonzalezaster [Spatangoida]
- Goodallia, Turton 1822 [Astartidae]
- Goodalliopsis [Cardiida]
- Goodhallites, Spath 1932 [Brancoceratidae]
- Goodradigbeeon, White 1978 [Arthrodira]
- Goodrichthys [Ctenacanthiformes]
- Goossensia [Cardiida]
- Gorbachikella [Foraminifera]
- Gorbyoceras, S. Shimizu and T. Obata 1935 [Proteoceratidae]
- Gordonicyathus, Zhuravleva 1959 [Ajacicyathida]
- Gordonifungia [Ajacicyathida]
- Gordonoceras, Teichert and Glenister 1953 [Spyroceratidae]
- Goreauiella [Tabulospongida]
- Gorgansium, Pessagno and Blome 1980 [Pantanelliidae]
- Gorgonichthys, Claypole 1892 [Arthrodira]
- Gorgonoceras, Zhuravleva 1961 [Lamellorthoceratidae]
- Gorgonophontes [Stomatopoda]
- Gorgospyris, Haeckel 1881 [Triospyrididae]
- Gorgostrophia [Strophodontidae]
- Gorisella [Foraminifera]
- Gorizdronia, Rozkowska 1969 [Laccophyllidae]
- Gorjanovicia, Polsak 1967 [Radiolitidae]
- Gorjanskya [Obolidae]
- Goronyosaurus, Azzaroli et al. 1972 [Mosasauridae]
- Gorskyella [Anthozoa]
- Gorskyites, Sokolov 1955 [Gorskyitidae]
- Gortanipora [Trepostomida]
- Gorystrophia [Strophomenida]
- Goryunovia [Cyclostomata]
- Gosavia, Stolickza 1866 [Volutidae]
- Gosaviaraea, Oppenheim 1930 [Microsolenidae]
- Goshoraia, Tamura 1977 [Veneridae]
- Goslinophis, Blot 1981 [Ophichthidae]
- Gotatrypa [Atrypidae]
- Gothicispira, Maxwell 1988 [Newtoniellidae]
- Gothocrinus, Bather 1893 [Cladida]
- Gothograptus [Retiolitidae]
- Goticaris [Arthropoda]
- Gotlandechinus [Cravenechinidae]
- Gotlandella [Platycopida]
- Gotlandellites, K. Larsson 1979 [Gotlandellitidae]
- Gotlandites [Eunicemorpha]
- Gotlandochitina [Rhizopodea]
- Gotula [Palaeocopida]
- Goudkoffia, David 1946 [Salmoniformes]
- Gougerotia [Sacoglossa]
- Gouldia, C. B. Adams 1847 [Veneridae]
- Goungjunspirifer [Ulbospiriferidae]
- Goupillaudina [Foraminifera]
- Gourdonia, Pillet 1954 [Phacopida]
- Gourmya, Fischer 1884 [Cerithiidae]
- Goycoia, Rusconi 1950 [Trilobita]
- Grabauphyllum, Foerste 1917 [Endophyllidae]
- Grabella [Pterioida]
- Gracemerea, Engel and Morris 1989 [Proetida]
- Gracianella, Johnson and Boucot 1967 [Atrypinidae]
- Graciella, Rozova 1963 [Lonchocephalidae]
- Gracilechinus [Echinidae]
- Graciliala, N. F. Sohl 1960 [Aporrhaidae]
- Gracilisphinctes [Perisphinctidae]
- Gracilispira, Olsson 1956 [Olividae]
- Gracilites, Bogoslovsky 1972 [Teicherticeratidae]
- Graciloceras, Flower 1943 [Graciloceratidae]
- Gracilocyathus [Cribricyathea]
- Gracilopora, Chudinova 1964 [Pachyporidae]
- Gracilotoechia [Ladogiidae]
- Gracquina [Palaeocopida]
- Graffhamicrinus, Strimple 1961 [Diphuicrinidae]
- Graftonoceras, Foerste 1925 [Trocholitidae]
- Gramannicythere [Protocytheridae]
- Grambergia, Y. N. Popov 1961 [Longobarditidae]
- Gramella [Palaeocopida]
- Grammanotosoecia [Cyclostomata]
- Grammascosoecia [Cyclostomata]
- Grammatodon, Meek and Hayden 1860 [Parallelodontidae]
- Grammatodon (Cosmetodon), Branson 1942 [Parallelodontidae]
- Grammatodonax [Cardiida]
- Grammatorycnus, Gill 1863 [Scombridae]
- Grammechinus [Temnopleuridae]
- Grammella [Membraniporidae]
- Grammoceras [Hildoceratidae]
- Grammolomatella [Palaeocopida]
- Grammorhynchus [Allorhynchidae]
- Grammothoa [Cheilostomata]
- Grammysia, de Verneuil 1847 [Grammysiidae]
- Grammysioidea, Williams 1916 [Grammysiidae]
- Granatocrinus [Spiraculata]
- Granatodontus [Conodontophorida]
- Grandagnostus, Howell 1935 [Agnostida]
- Grandalveolites, Mironova 1970 [Alveolitidae]
- Grandaurispina, Muir-Wood and Cooper 1960 [Linoproductidae]
- Grandaxinea [Glycymerididae]
- Grandiarca, Olsson 1961 [Arcidae]
- Grandicornus [Orthothecida]
- Grandidiericeras [Desmoceratidae]
- Grandifavia, Babaev 1964 [Faviidae]
- Grandioculus, Cossmann 1908 [Proasaphiscidae]
- Grandiproductella [Productidae]
- Granobrissoides [Brissidae]
- Granocardium, Gabb 1868 [Cardiidae]
- Grantitheca [Hyolithida]
- Grantonia [Trigonotretidae]
- Granula, Jousseaume 1875 [Marginellidae]
- Granularapis [Corynexochida]
- Granulidictyum, Schindewolf 1959 [Micheliniidae]
- Granuliferella [Endothyridae]
- Granuliferelloides [Foraminifera]
- Granulina, Leleshus 1975 [Plasmoporellidae]
- Granulina, Jousseaume 1888 [Cystiscidae]
- Granulittorina, Habe and Kosuge [Littorinidae]
- Granuloagnostus, Pek 1970 [Agnostida]
- Granulochlamys [Pectinidae]
- Granulolabium, Cossmann 1889 [Batillariidae]
- Graphepleurus [Temnopleuridae]
- Graphiadactyllis [Quasillitidae]
- Graphidula, L. W. Stephenson 1941 [Fasciolariidae]
- Graphiocrinus, de Koninck and Lehon 1854 [Graphiocrinidae]
- Graphis [Tofanellidae]
- Graphoceras [Graphoceratidae]
- Graphoscyphus [Archaeocyathida]
- Graphularia [Anthozoa]
- Graptacme, Pilsbry 1897 [Dentaliidae]
- Graptoblastoides [Graptolithina]
- Graptoblastus [Graptolithina]
- Graptocamara [Camaroidea]
- Graptocarcinus, Roemer 1887 [Dynomenidae]
- Graptodictya, Ulrich 1882 [Escharoporidae]
- Graptogeitonia [Hydrozoa]
- Graptolodendrum [Dendroidea]
- Graptoloidea, order, Lapworth 1875 [Graptolithina]
- Graptopora, Lang 1916 [Cheilostomata]
- Graptoporella [Cheilostomata]
- Graptovermis [Rhabdopleurida]
- Grasia [Collyritidae]
- Grasirhynchia [Rhynchonellidae]
- Gratagnostus, Khairullina 1975 [Agnostida]
- Grateloupia, Des Moulins 1828 [Veneridae]
- Gravellina [Foraminifera]
- Gravesia [Aulacostephanidae]
- Gravestockia, Reitner 1992 [Lithonida]
- Gravia [Palaeocopida]
- Graviscalpellum, Foster 1980 [Scalpellidae]
- Grayiceras [Sphaeroceratidae]
- Grayina [Parastrophinidae]
- Graysonites, Young 1958 [Acanthoceratidae]
- Grazosteus, Gross 1958 [Arthrodira]
- Greenfieldia [Athyrididae]
- Greenlandoceras [Orthocerida]
- Greenlandoceras, Shimizu and Obata 1935 [Greenlandoceratidae]
- Greenwoodella [Crossognathiformes]
- Gregariella, Monterosato 1883 [Mytilidae]
- Gregorioiscala, Cossman 1912 [Epitoniidae]
- Gregoryceras [Aspidoceratidae]
- Grekoffiana [Podocopida]
- Grenprisia, Moore 1962 [Cladida]
- Gresslya, Agassiz 1843 [Ceratomyidae]
- Grewgiphyllum, Oliver 1974 [Eridophyllidae]
- Grewingkia, Dybowski 1873 [Streptelasmatidae]
- Griesbachites, E. v. Mojsisovics 1896 [Juvavitidae]
- Grigelis [Nodosariidae]
- Grillina [Ichthyolariidae]
- Grillita [Foraminifera]
- Grimsbyoceras, Foerste 1934 [Acleistoceratidae]
- Grimsdaleinella [Foraminifera]
- Grinioneis [Podocopida]
- Grinnellaspis, Poulson 1946 [Bathyuridae]
- Griphasaphus, Opik 1967 [Asaphidae]
- Griphocrinus, Kirk 1945 [Diplobathrida]
- Griphodictya [Reticulosa]
- Griphognathus, Gross 1956 [Dipteriformes]
- Grippia, Wiman 1930 [Grippiidae]
- Groebericeras [Olcostephanidae]
- Groenlandaspis, Heintz 1932 [Arthrodira]
- Groenlandibelus, Birkelund 1956 [Sepiida]
- Groenlandophyllum, Flügel 1973 [Polycoeliidae]
- Groenwallia [Ptychopariida]
- Groessensia, Termier and Termier 1975 [Thecostegitidae]
- Grorudia, Spjeldnaes 1957 [Grorudiidae]
- Grossaspis, White and Moy-Thomas 1940 [Antiarcha]
- Grossopterus [Eurypterida]
- Grossouvria [Perisphinctidae]
- Grotriania [Cardiida]
- Gruendelella [Podocopida]
- Gruendelicythere [Cytherissinellidae]
- Gruenewaldia [Myophoriidae]
- Gruenewaldtia [Palaferellidae]
- Grumantaspis [Pteraspidomorphes]
- Grumiphyllia, Wells 1937 [Faviidae]
- Grundelella [Podocopida]
- Grundensia [Cardiida]
- Gryphaea, Lamarck 1801 [Gryphaeidae]
- Gryphaeligmus [Pterioida]
- Gryphaeostrea, Conrad 1865 [Gryphaeidae]
- Gryphellina, Iredale 1929 [Limidae]
- Gryphiswaldensia [Palaeocopida]
- Gryphus, Megerle von Mühlfeld 1811 [Terebratulidae]
- Grypoceras, Hyatt 1883 [Grypoceratidae]
- Grypocrinus, Strimple 1963 [Crinoidea]
- Grypodon [Pycnodontiformes]
- Gryponautilus, Mojsisovics 1902 [Grypoceratidae]
- Grypophyllum, Wedekind 1922 [Ptenophyllidae]
- Grzegorzewskia [Nautilida]
- Gshelia, Shtukenberg 1888 [Bothrophyllidae]
- Gsollbergella [Ophthalmidiidae]
- Guadalupiida, order [Demospongea]
- Gualtieria [Brissidae]
- Guandacolithus, Harrington and Leanza 1957 [Trinucleidae]
- Guangdongella [Ostracoda]
- Guangshunia [Terebratulida]
- Guangxiispirifer [Ambocoeliidae]
- Guangyuanaspis, Lu and Chang 1974 [Redlichiida]
- Guangyuanella, Chang 1974 [Archaeocopida]
- Guangyuanoceras [Oncocerida]
- Guangyuanoceroides [Oncocerida]
- Guanziyaopora, Kim and Yang 1978 [Pachyporidae]
- Guaxa [Athyrididae]
- Gubbera [Anthozoa]
- Guberites [Palaeocopida]
- Gubkinella [Foraminifera]
- Gubkiniella [Podocopida]
- Gubleria [Lyttoniidae]
- Gublerina [Foraminifera]
- Guebhardia [Bivalvia]
- Guembelastraea, Cuif 1976 [Guembelastraeidae]
- Guembelites, E. Mojsisovics 1896 [Juvavitidae]
- Guembelitria [Guembelitriidae]
- Guembelitriella [Foraminifera]
- Guembelitrioides [Foraminifera]
- Guerangeria, Oehlert 1880 [Modiomorphidae]
- Guerichicaris [Archaeostraca]
- Guerichiella [Palaeocopida]
- Guerichina, Boucek and Prantl 1961 [Peneauiidae]
- Guerichiphyllum, Rozkowska 1969 [Laccophyllidae]
- Guettardicrinus [Millericrinida]
- Guettardiscyphia, Fromentel 1860 [Cribrospongiidae]
- Guettaria [Holasteridae]
- Guhsania [Sonniniidae]
- Guichenia, Henry 1968 [Dalmanitidae]
- Guichenocarpos [Mitrata]
- Guicyrtia [Adolfiidae]
- Guidonia [Murchisoniina]
- Guildfordia, Gray 1850 [Turbinidae]
- Guildingia [Neoloricata]
- Guilinospirifer [Dimegelasmidae]
- Guistrophia [Areostrophiidae]
- Guitarra [Demospongea]
- Guizhouchaetetes [Tabulospongida]
- Guizhouella [Monticuliferidae]
- Guizhoupecten, Chen 1962 [Streblochondriidae]
- Guizhoustriatopora, Chow 1978 [Pachyporidae]
- Gujaratella [Podocopida]
- Guleilmites [Kosmoceratidae]
- Gulielmiceras, Buckman 1920 [Kosmoceratidae]
- Gulielmina [Kosmoceratidae]
- Gumbycyathus [Ajacicyathida]
- Gumina, Finlay 1928 [Pyramidellidae]
- Gunaspis [Pteraspidomorphes]
- Gunnarites, Kilian and Reboul 1909 [Kossmaticeratidae]
- Gunneropsis [Podocopida]
- Gunningblandella, Percival 1979 [Sowerbyellidae]
- Gunteria [Foraminifera]
- Guppyella [Foraminifera]
- Guraleus, Hedley 1918 [Turridae]
- Gurieuskiella [Anthozoa]
- Gusarella, Prozorovskaja 1962 [Gusarellidae]
- Gustabilicrinus, Guensburg 1984 [Diplobathrida]
- Gutnicella [Foraminifera]
- Gutticonus [Mollusca]
- Gutticrinus, Klikushin 1987 [Cyrtocrinida]
- Guttulina, d'Orbigny 1839 [Polymorphinidae]
- Gutturnium, Mörch 1853 [Ranellidae]
- Guynia, Duncan 1837 [Guyniidae]
- Gwynia, King 1859 [Terebratulida]
- Gwyniella, Johanson 1987 [Terebratulida]
- Gymnarus, Gabb 1868 [Aporrhaidae]
- Gymnentome, Cossmann 1909 [Cassiopidae]
- Gymnites, E. v. Mojsisovics 1882 [Gymnitidae]
- Gymnocerithium, Cossmann 1906 [Campanilidae]
- Gymnocrinus, Loriol 1879 [Cyrtocrinida]
- Gymnodiadema [Orthopsidae]
- Gymnodiscoceras [Oppeliidae]
- Gymnograptus [Graptoloidea]
- Gymnolaemata, class, Allman 1856 [Bryozoa]
- Gymnophyllum, Howell 1945 [Stauriida]
- Gymnoplites [Cephalopoda]
- Gymnosarda, Gill 1863 [Scombridae]
- Gymnoscopelus, Guenther 1873 [Myctophiformes]
- Gymnostomix, Fortey and Owens 1987 [Trinucleidae]
- Gymnotrachelus, Dunkle and Bongert 1939 [Selenosteidae]
- Gymnotropites, A. Hyatt and J. P. Smith 1905 [Tropitidae]
- Gymnura, Van Hasselt 1823 [Gymnuridae]
- Gymocetus, Romer 1966 [Sauropterygia]
- Gypidulella [Gypidulidae]
- Gypidulina, Rzhonsnitzkaya 1956 [Gypidulidae]
- Gypsina, Carter 1877 [Acervulinidae]
- Gyrgathella [Palaeocopida]
- Gyrineum, Link 1807 [Ranellidae]
- Gyrispongia [Lychniscosa]
- Gyroceras [Oncocerida]
- Gyroceratites, Meyer 1831 [Mimoceratidae]
- Gyroclymenia [Platyclymeniidae]
- Gyroconulina [Foraminifera]
- Gyrocystis [Homostelea]
- Gyrocythere [Podocopida]
- Gyrodendron, Quenstedt 1880 [Calamophylliidae]
- Gyrodes, Conrad 1860 [Naticidae]
- Gyrodes (Hypterita) (Woodring 1957) [Naticidae]
- Gyrodes (Sigaretopsis), Cossmann 1888 [Naticidae]
- Gyroidina, d'Orbigny 1826 [Rotaliidae]
- Gyroidinella [Foraminifera]
- Gyroidinoides [Rotaliidae]
- Gyrolepidoides, Cabrera 1944 [Palaeonisciformes]
- Gyronaedyceras, Flower 1945 [Brevicoceratidae]
- Gyropeltus [Pteraspidomorphi]
- Gyroplacosteus, Obrutschev 1930 [Arthrodira]
- Gyropleura, Douvillé 1887 [Monopleuridae]
- Gyroptychius, M'Coy 1848 [Rhizodontidae]
- Gyroscala, de Boury 1887 [Epitoniidae]
- Gyroselenella, Li 1985 [Trimerellidae]
- Gyrostrea, Mirkamalov 1963 [Gryphaeidae]
- Gyrothyris, Thomson 1918 [Terebratellidae]
- Gyrotropis, Gabb 1877 [Gyrotropidae]
- Gyrovalvulina [Foraminifera]
- Gythemon, Casey 1952 [Arcticidae]
- Haasia, Yuan 1988 [Proetidae]
- Habanaster [Holasteroida]
- Habelia [Arthropoda]
- Habonucula, Singh and Kanjilal 1977 [Praenuculidae]
- Habrocephalus, Repina 1964 [Ptychopariida]
- Habrocythere [Podocopida]
- Habrostroma, Fagerstrom 1982 [Coenostromatidae]
- Hacobjanella, Atabekjan 1976 [Radiolitidae]
- Hacobjania, Aliev & Lysenko 1986 [Cephalaspida]
- Hacquetia, Szajnocha 1886 [Clupeiformes]
- Haddonia [Lituolidae]
- Hadimopanella, Gedik 1977 [Palaeoscolecidae]
- Hadoprion [Eunicemorpha]
- Hadragnostus, Opik 1967 [Agnostidae]
- Hadriania, Bucquoy et al. 1882 [Muricidae]
- Hadroblastus, R. O. Fay 1962 [Phaenoschismatidae]
- Hadrochthus [Isorophida]
- Hadrocrinus, Lyon 1869 [Monobathrida]
- Hadrocystis, Sprinkle 1974 [Rhombifera]
- Hadrodiscus [Isorophida]
- Hadrodontina [Ellisoniidae]
- Hadrohybus, Raymond 1925 [Phacopida]
- Hadromerida, order, Topsent 1898 [Demospongea]
- Hadromeros, Lane 1971 [Cheiruridae]
- Hadrophyllum, Milne-Edwards and Haime 1850 [Hadrophyllidae]
- Hadrorhynchia [Hadrorhynchiidae]
- Hadrosteus, Gross 1932 [Arthrodira]
- Hadrotatorhynchus [Leiorhynchidae]
- Hadrotreta, Rowell 1966 [Acrotretidae]
- Hadyrhyncha [Rozmanariidae]
- Haeggochiton [Scanochitonidae]
- Haenleinia [Pterioida]
- Haerella [Foraminifera]
- Haereticotaxocrinus, Franzen 1981 [Taxocrinida]
- Haeretocrinus, Moore and Pulmmer 1940 [Scytalocrinidae]
- Haeuslerella [Textulariidae]
- Haffnericambria [Maxillopoda]
- Hagenowella [Foraminifera]
- Hagenowia [Holasteridae]
- Hagenowina [Foraminifera]
- Hagenowinella [Cheilostomata]
- Hagiastrum, Haeckel 1881 [Hagiastridae]
- Hahazimania, Yabe and Hatai 1939 [Ampullinidae]
- Haidingerites, E. v. Mojsisovics 1893 [Ceratitida]
- Haileyia [Polychaeta]
- Haimasiella [Foraminifera]
- Haimea [Oligopygidae]
- Haimeina [Ctenostomata]
- Haimesiphyllia, Alloiteau 1957 [Faviidae]
- Hainbergia, Schweizer 1966 [Actinistia]
- Hainosaurus, Dollo 1885 [Mosasauridae]
- Hajulia, Woodward 1942 [Anguilliformes]
- Halenia [Foraminifera]
- Halesium, Pessagno 1971 [Patulibracchiidae]
- Halia, Risso 1926 [Volutidae]
- Halianassa [Dugongidae]
- Halicalyptra, Dumitrica 1973 [Dictyochaceae]
- Halice [Decapoda]
- Halichondrites, Walcott 1920 [Halichondritidae]
- Halicyne [Cyclidae]
- Halidictyum [Spumellaria]
- Halilucites, C. Diener 1905 [Ceratitidae]
- Halina [Astrophorida]
- Haliomma, Ehrenberg 1838 [Spumellaria]
- Haliophis, Rueppell 1829 [Perciformes]
- Haliotiomorpha [Archaeogastropoda]
- Haliotis, Linnaeus 1758 [Haliotidae]
- Haliotis (Sulculus), Adams and Adams 1854 [Haliotidae]
- Haliphoebus, Kiener 1879 [Xenophoridae]
- Haliphormis [Nassellaria]
- Halisaurus, O. C. Marsh 1869 [Mosasauridae]
- Halistylus, Dall 1890 [Trochidae]
- Halkyardia [Foraminifera]
- Halla [Eunicemorpha]
- Hallatia [Palaeocopida]
- Hallia, Milne-Edwards and Haime 1850 [Halliidae]
- Hallicystis, Jaekel 1899 [Rhombifera]
- Hallidaya [Cyclozoa]
- Halliella, Ulrich 1891 [Beyrichiidae]
- Hallina [Anazygidae]
- Hallirhoa, Lamouroux 1821 [Siphoniidae]
- Halloceras, Hyatt 1884 [Rutoceratidae]
- Hallocrinus, Goldring 1923 [Cladida]
- Hallodictya [Reticulosa]
- Hallograptus, Lapworth 1876 [Graptoloidea]
- Halloporina, suborder, Astrova 1965 [Trepostomata]
- Hallotheca, Malinky et al. 1987 [Hyolithidae]
- Halloysia, Briart and Cornet 1877 [Newtoniellidae]
- Hallstadtia, Cossmann 1915 [Lacunidae]
- Halobia, Bronn 1830 [Halobiidae]
- Halochitina [Rhizopodea]
- Halogetocrinus, Strimple and Moore 1971 [Ampelocrinidae]
- Haloginella [Neogastropoda]
- Halomitra, Dana 1846 [Fungiidae]
- Halonympha, Dall and Smith 1886 [Cuspidariidae]
- Halorella, Bittner 1884 [Halorellidae]
- Halorelloidea [Halorellidae]
- Halorites, E. v. Mojsisovics 1879 [Haloritidae]
- Halysicyathus [Ajacicyathida]
- Halysiocrinus, Ulrich 1886 [Calceocrinidae]
- Halysitastraea, O. F. Geyer 1968 [Cladophylliidae]
- Halysites, von Waldheim 1813 [Halysitidae]
- Hamacantha [Poecilosclerida]
- Hamacuna, Cotton 1931 [Condylocardiidae]
- Hamarilopora, Le Maître 1956 [Favositidae]
- Hamarodus [Conodontophorida]
- Hamashania, Kobayashi 1941 [Trilobita]
- Hamatoconus [Mollusca]
- Hamatolenus, Hupe 1952 [Ellipsocephalidae]
- Hamburgia [Cranaenidae]
- Hameaschmidtella [Ostracoda]
- Hamiroproetus, Snajdr 1977 [Proetidae]
- Hamites, Parkinson 1811 [Hamitidae]
- Hamiticeras [Ancyloceratidae]
- Hamitoides [Cephalopoda]
- Hamlingella (Reed 1943) [Araksalosiidae]
- Hamlinia, Boehm 1900 [Cephalaspida]
- Hammannopyge, Pribyl and Vanek 1985 [Phacopida]
- Hammatoceras [Hammatoceratidae]
- Hammatocyclus, Schindewolf 1951 [Pericyclidae]
- Hammatocythere [Podocopida]
- Hammatopsis [Polychaeta]
- Hamodus [Coelacanthiformes]
- Hamptonia, Walcott 1920 [Hamptoniidae]
- Hamptoniella, Wenz 1938 [Acmaeidae]
- Hamulina [Hamulinidae]
- Hamulinites, Paquier 1900 [Ancyloceratidae]
- Hamulus [Serpulimorpha]
- Hamusella, Val'kov 1987 [Cyrtonellida]
- Hamusina, Gemmellaro 1878 [Cirridae]
- Hanaeproductus [Monticuliferidae]
- Hanaiborchella [Podocopida]
- Hanaiceratina [Podocopida]
- Hanaicythere [Podocopida]
- Hanaites [Palaeocopida]
- Hanburia [Arthropoda]
- Hanchiangella, Huo 1956 [Archaeocopida]
- Hanchungolithus, Lu 1956 [Trinucleidae]
- Hanetia, Jousseaume 1880 [Buccinidae]
- Hanielites, O. Welter 1922 [Kashmiritidae]
- Hanilepis, Wang and Dong 1989 [Climatiiformes]
- Hanivella [Ptychopariida]
- Haniwa, Kobayashi 1933 [Remopleurididae]
- Haniwoides, Kobayashi 1953 [Ceratopygidae]
- Hanjiangaspis, Zhou and Xiang 1993 [Proetida]
- Hankaxis, Birenheide 1978 [Ptenophyllidae]
- Hanleya, Gray 1857 [Hanleyidae]
- Hanostaffella [Foraminifera]
- Hansenisca [Foraminifera]
- Hansotreta [Acrotretidae]
- Hantkeniceras [Phylloceratidae]
- Hantkenina [Foraminifera]
- Hanusia [Cornuta]
- Hanusitrypa [Atrypidae]
- Hanzawaia, Asano 1944 [Gavelinellidae]
- Haoella [Foraminifera]
- Hapalocrinus, Jaekel 1895 [Hapalocrinidae]
- Hapalorbis [Turbinidae]
- Haplacanthus, Agassiz 1845 [Acanthoessidae]
- Haplaraera (Milaschewitsch 1876) [Astraraeidae]
- Haplentactinia, Foreman 1963 [Entactinaria]
- Haplistion, Young and Young 1877 [Haplistiidae]
- Haplobolbina [Palaeocopida]
- Haplocephalopora [Cheilostomata]
- Haploceras, Zittel 1870 [Haploceratidae]
- Haplocochlias, Carpenter 1864 [Turbinidae]
- Haplocrinites, Troost 1850 [Haplocrinitidae]
- Haplocytheridea [Podocopida]
- Haplodiacanthus, Nazarov and Rudenko 1981 [Follicucullidae]
- Haplograptus [Graptolithina]
- Haplohelia, Reuss 1864 [Oculinidae]
- Haplolasma, Semenoff-Tian-Chansky 1974 [Aulophyllidae]
- Haplolepis, Miller 1892 [Palaeonisciformes]
- Haplooecia [Cyclostomata]
- Haplophragmella [Foraminifera]
- Haplophragmina [Foraminifera]
- Haplophragmium [Ammobaculinidae]
- Haplophragmoides, Cushman 1910 [Haplophragmoiidae]
- Haplophylloceras [Phylloceratitida]
- Haplopleuroceras [Hammatoceratidae]
- Haplopoma [Cheilostomata]
- Haplopomella [Cheilostomata]
- Haploprimitia [Palaeocopida]
- Haploptyxis [Heterostrophia]
- Haploscaphites [Cephalopoda]
- Haplosclerida, order [Demospongea]
- Haplosphaeronis, Jaekel 1926 [Sphaeronitidae]
- Haplospirifer [Strophopleuridae]
- Haplothecia, Frech 1885 [Disphyllidae]
- Haplotrypa, Bassler 1936 [Cystoporata]
- Haplovoluta, Wade 1918 [Neogastropoda]
- Hapsidocare, Shergold 1975 [Corynexochida]
- Hapsidopora [Cheilostomata]
- Hapsiphyllum, Simpson 1900 [Hapsiphyllidae]
- Hapsizaphrentis [Anthozoa]
- Haptaphyllina [Heterocorallia]
- Haptophyllum, Pedder 1967 [Petraiidae]
- Hardaghia [Hippuritida]
- Hardieopterus [Hardieopteridae]
- Hardmanoceras, Teichert and Glenister 1952 [Trocholitidae]
- Hardyia, Walcott 1924 [Missisquoiidae]
- Hardyoides, Kobayashi 1938 [Norwoodiidae]
- Harengula, Cuvier and Valenciennes [Clupeiformes]
- Haresiceras [Cephalopoda]
- Harfordia [Neogastropoda]
- Harginisulcus [Palaeocopida]
- Harknessella [Harknessellidae]
- Harmatia [Neogastropoda]
- Harmeria [Neotaenioglossa]
- Harmeriella [Ctenostomata]
- Harmostocrinus, Strimple 1975 [Cladida]
- Harpa, Röding 1798 [Harpidae]
- Harpabollia [Palaeocopida]
- Harpacodus, St. John and Worthen 1875 [Petalodontidae]
- Harpactocarcinus, A. Milne-Edwards 1862 [Zanthopsidae]
- Harpactoxanthopsis, Via 1959 [Zanthopsidae]
- Harpago, Mörch 1852 [Strombidae]
- Harpagodes, Gill 1870 [Aporrhaidae]
- Harpella, H. Adams and A. Adams 1858 [Volutidae]
- Harperopsis [Podocopida]
- Harpesoides, Koroleva 1978 [Harpetidae]
- Harpidella, McCoy 1849 [Aulacopleuridae]
- Harpides, Beyrich 1846 [Harpididae]
- Harpidium, Kirk 1925 [Pentameridae]
- Harpidoides [Ptychopariida]
- Harpoceras [Hildoceratidae]
- Harpoceratoides [Hildoceratidae]
- Harpohildoceras [Hildoceratidae]
- Harpula, Swainson 1840 [Volutidae]
- Harrelicrinus [Monobathrida]
- Harrellicrinus, Arendt and Broadhead 1982 [Cladida]
- Harriotta, Goode and Bean 1895 [Rhinochimeridae]
- Harrisianella, Olson 1929 [Potamididae]
- Harrisoceras, Flower 1939 [Geisonoceratidae]
- Harrycaris [Concavicarida]
- Harrytoombsia, Miles and Dennis 1979 [Arthrodira]
- Hartmanina [Catenispongiidae]
- Hartshillia, Illing 1914 [Corynexochidae]
- Hartshillina, Lake 1940 [Ptychopariida]
- Harttella [Cranaenidae]
- Harttites [Problematica]
- Hartungia, Bronn 1861 [Janthinidae]
- Hartwellia, Kitchin 1926 [Arcticidae]
- Haruspex [Orthocerida]
- Hastacypris [Podocopida]
- Hastagnostus, Howell 1937 [Agnostida]
- Hastatellina [Palaeocopida]
- Hastigerina, Thomson 1876 [Globorotaliidae]
- Hastigerinella [Foraminifera]
- Hastigerinoides [Foraminifera]
- Hastigerinopsis [Foraminifera]
- Hastimima [Eurypterida]
- Hastites [Belemnitida]
- Hastula, H. Adams and A. Adams 1853 [Terebridae]
- Haswellia [Cheilostomata]
- Hataiyoldia [Sareptidae]
- Hatangeus [Palaeocopida]
- Hatangia, Egorova and Savitsky 1968 [Ptychopariida]
- Hatasia [Myoida]
- Hatayin [Hippuritida]
- Hatchericeras, Stanton 1901 [Neocomitidae]
- Hattonia, Jones 1927 [Favositidae]
- Hauericeras, de Grossouvre 1894 [Desmoceratidae]
- Hauerina, d'Orbigny 1839 [Miliolidae]
- Hauerites, E. v. Mojsisovics 1893 [Tibetitidae]
- Haugia [Phymatoceratidae]
- Haumea [Pterioida]
- Haupiria, MacKinnon 1983 [Kutorginidae]
- Haurakia, Iredale 1915 [Rissoidae]
- Haurania [Spirocyclinidae]
- Haustator (Monfort 1810) [Turritellidae]
- Haustellum, Schumacher 1817 [Muricidae]
- Hautura [Neogastropoda]
- Havlicekella [Leiorhynchidae]
- Havlicekia [Cyrtiidae]
- Hawaiarca, Dall et al. 1938 [Arcidae]
- Hawthorneachiton [Polyplacophora]
- Hayasakaia, Lang et al. 1940 [Tetraporellidae]
- Hayasakaina [Staffellidae]
- Haydenoceras, Flower 1949 [Barrandoceratidae]
- Haynesina [Foraminifera]
- Hazelia, Walcott 1920 [Hazeliidae]
- Hazelina [Podocopida]
- Healdia [Healdiidae]
- Healdiacypris [Podocopida]
- Healdianella [Healdiidae]
- Healdioides [Metacopida]
- Hebediscina, Rasetti 1972 [Agnostida]
- Hebediscus, Whitehouse 1936 [Hebediscidae]
- Hebellum [Palaeocopida]
- Hebertella, J. Hall and J. M. Clarke 1892 [Plectorthidae]
- Hebertocaris, Stumm and Chilman 1969 [Archaeostraca]
- Hebeseila, Finlay 1927 [Cerithiopsidae]
- Hebeticrinus [Comatulida]
- Hebetoceras, Flower 1941 [Hebetoceratidae]
- Hebetoechia [Hebetoechiidae]
- Hebetoxyites [Strigoceratidae]
- Hebra, H. Adams and A. A 1853 [Buccinidae]
- Hebukophyllum [Anthozoa]
- Hechticythere [Podocopida]
- Hechtina [Nubeculariidae]
- Hecia, J. J. Sepkoski 2002 [Decapoda]
- Heckericyathus [Ajacicyathida]
- Heckericystis [Soluta]
- Hecticoceras, Bonarelli 1893 [Oppeliidae]
- Hectioceras [Cephalopoda]
- Hectioceratoides [Oppeliidae]
- Hedbergella [Hedbergellidae]
- Hedecardium, Marwick 1944 [Cardiidae]
- Hedeinopsis [Hedeinopsidae]
- Hedeliastraea [Scleractinia]
- Hedenstroemia, Waagen 1895 [Hedenstroemiidae]
- Hederopsis [Cyclostomata]
- Hedinaspis, Troedsson 1951 [Ceratopygidae]
- Hedraites [Cornuspiridae]
- Hedstroemia, Pribyl and Vanek 1978 [Proetidae]
- Hedstroemina, B. B. Bancroft 1929 [Rafinesquinidae]
- Hedstroemoceras, A. A. Foerste 1930 [Baltoceratidae]
- Hefriga, Munster 1839 [Decapoda]
- Heftastylis [Axinellida]
- Hefteria [Trigoniida]
- Hegleria, Nazarov and Ormiston 1985 [Entactiniidae]
- Heida [Heterostrophia]
- Heilprinia, Grabau 1900 [Fasciolariidae]
- Heimia, Haas 1890 [Postepithyrididae]
- Heinia [Podocopida]
- Heintzella, Fedorowski 1967 [Kleopatrinidae]
- Heintzichthys, Whitley 1933 [Arthrodira]
- Heinzia [Cephalopoda]
- Helaspis [Productellidae]
- Helcion, Montfort 1810 [Patellidae]
- Helcionelloida, class, J.S. Peel 1991 [Mollusca]
- Helenathyris [Athyrididae]
- Helenia, Walcott 1889 [Hyolithidae]
- Helenifore, Nazarov and Ormiston 1983 [Ceratoikiscidae]
- Helenolepis, Karartajüté-Talimaa 1978 [Katoporididae]
- Helenolites, Chekhovich 1977 [Proporidae]
- Helenopora [Helenoporidae]
- Helentappanella [Miliolidae]
- Helepagetia, Jell 1975 [Eodiscidae]
- Helgolandichthys, Taverne 1981 [Salmoniformes]
- Heliacus, d'Orbigny 1842 [Architectonicidae]
- Heliacus (Granosolarium), Sacco 1892 [unclassified subgenus]
- Helicacanthus [Archaeogastropoda]
- Helicancylus [Acrioceratidae]
- Helicaulax, Gabb 1868 [Aporrhaidae]
- Helichthys, Broom 1909 [Redfieldiidae]
- Helicocrinus [Crinoidea]
- Helicocryptus, d'Orbigny 1850 [Ataphridae]
- Helicocyclus, Schindewolf 1951 [Pericyclidae]
- Helicodictya [Reticulosa]
- Helicolepidina [Foraminifera]
- Helicopora [Fenestrata]
- Helicorbitoides [Foraminifera]
- Helicostegina [Foraminifera]
- Helicosteginopsis [Foraminifera]
- Helictites, E. v. Mojsisovics 1893 [Thetiditidae]
- Helieranella, Baldis and Gonzalez 1984 [Ptychopariida]
- Heligmina [Pterioida]
- Heligmope, Tate 1893 [Janthinidae]
- Heligmopsis [Pterioida]
- Heligmostylus, Cossmann 1909 [Spirostylidae]
- Heligmotenia [Neogastropoda]
- Heligothyris [Terebratulida]
- Heliocephalus, Delo 1935 [Phacopida]
- Heliocidaris [Echinoida]
- Heliocladus [Spumellaria]
- Heliocrinites, Eichwald 1840 [Caryocystitidae]
- Heliocryptocapsa, Dumitrica 1970 [Sethocapsidae]
- Heliocythere [Podocopida]
- Heliodiscus, Haeckel 1862 [Heliodiscidae]
- Helioentactinia, Nazarov 1975 [Entactiniidae]
- Heliofungia, Wells 1966 [Fungiidae]
- Helioharpes, Pribyl and Vanek 1981 [Harpetidae]
- Heliolites, Dana 1846 [Heliolitidae]
- Heliomedusa, Sun and Hou 1987 [Disciniidae]
- Heliomera, Raymond 1905 [Cheiruridae]
- Heliophyllum, Hall 1846 [Zaphrentidae]
- Helioplasma, Kettnerova 1933 [Heliolitidae]
- Helioplasmolites, Chekhovich 1955 [Heliolitidae]
- Heliopora [Helioporacea]
- Helioporacea, order [Anthozoa]
- Helioproetoides, Yuan 1988 [Proetida]
- Helioproetus, Richter 1919 [Proetidae]
- Heliopyge, W. Haas and H. Mensink 1970 [Acastidae]
- Heliosaturnalis, Kozur and Mostler 1972 [Saturnalidae]
- Helioseris, Milne-Edwards and Haime 1849 [Agariciidae]
- Heliosocrinus, Strimple 1951 [Dendrocrinida]
- Heliosoma [Spumellaria]
- Heliosphaera, Haeckel 1860 [Astrosphaeridae]
- Heliospongia, Girty 1908 [Heliospongiidae]
- Heliostylina [Scleractinia]
- Heliostylus, Haeckel 1881 [Coccodiscidae]
- Heliotrypa [Cryptostomata]
- Helix [Cheilostomata]
- Helixotionella [Cheilostomata]
- Helladophyllia [Scleractinia]
- Hellebardia [Podocopida]
- Hellenocyclina [Foraminifera]
- Hellerocaris, Van Straelen 1924 [Coleiidae]
- Helloceras [Caryophylliidae]
- Helmersenia, Pander 1861 [Siphonotretidae]
- Helmetia [Arthropoda]
- Helminthidium, Lindström 1882 [Calostylidae]
- Helminthochiton, Salter 1846 [Lepidopleuridae]
- Helminthophyllum, Schrammen 1937 [Helminthophyllidae]
- Heloceras, Eichwald 1860 [Orthocerida]
- Heloclema [Cryptostomata]
- Helodiadema [Diadematoida]
- Helopora, Hall 1851 [Arthrostylidae]
- Heloraphinia, Schrammen 1937 [Carterellidae]
- Heloringulum [Nassellaria]
- Helotholus [Nassellaria]
- Helvetella [Terebrataliidae]
- Helveticosaurus, Peyer 1955 [Placodontia]
- Helvetoglobatruncana [Foraminifera]
- Hemeaschnidtella [Palaeocopida]
- Hemerocoetes, Cuvier and Valenciennes 1837 [Perciformes]
- Hemeschara [Cheilostomata]
- Hemiaechminoides [Palaeocopida]
- Hemiarges, Gürich 1901 [Lichidae]
- Hemiaulacophyllum, Kravtsov 1975 [Disphyllidae]
- Hemibaculites [Heteroceratidae]
- Hemibarrandia, Prantl and Pribyl 1949 [Panderiidae]
- Hemibashkirella [Fenestrata]
- Hemibeloitoceras, Balashov 1962 [Oncocerida]
- Hemibrachiocrinus, Arendt 1968 [Cyrtocrinida]
- Hemicara [Nucleolitidae]
- Hemicellaria [Cyclostomata]
- Hemicerithium, Cossmann 1893 [Cerithiidae]
- Hemichenopus, Steinmann and Wilckens 1908 [Aporrhaidae]
- Hemichoanella, Teichert and Glenister 1954 [Ellesmeroceratidae]
- Hemichonetes, Racheboeuf 1981 [Strophochonetidae]
- Hemichordata, phylum, Bateson 1885 [Ambulacraria]
- Hemiconus [Conidae]
- Hemicorbicula [Cardiida]
- Hemicosciniopsis [Cheilostomata]
- Hemicosmites, Buch 1840 [Hemicosmitidae]
- Hemicosmorthoceras, Ristedt 1968 [Sphaerorthoceratidae]
- Hemicricus [Tentaculitida]
- Hemicrinus, Orbigny 1850 [Cyrtocrinida]
- Hemicryptocapsa, Tan Sin Hok 1927 [Williriedellidae]
- Hemicyclammina [Foraminifera]
- Hemicyclaspis [Atelaspidiformes]
- Hemicyclonosta [Cardiida]
- Hemicyclopora [Romancheinidae]
- Hemicyprideis [Podocopida]
- Hemicystites, Hall 1852 [Hemicystitidae]
- Hemicythere [Podocopida]
- Hemicytheria [Podocopida]
- Hemicytheridea, Kingma 1948 [Cytheridae]
- Hemicytherura, Elofson 1941 [Cytheruridae]
- Hemidiadema [Glyphocyphidae]
- Hemidiscella [Ammodiscidae]
- Hemidiscosa, order, Schrammen 1924 [Hexactinellida]
- Hemidiscus [Ammodiscidae]
- Hemidonax, Mörch 1871 [Donacidae]
- Hemieridotrypa [Trepostomida]
- Hemieuryale, E. von Martens 1867 [Hemieuryalidae]
- Hemifaorina [Schizasteridae]
- Hemifusulina [Foraminifera]
- Hemifusulinella [Foraminifera]
- Hemifusus, Swainson 1840 [Melongenidae]
- Hemigarantia [Parkinsoniidae]
- Hemigymnia [Schizasteridae]
- Hemihaploceras [Oppeliidae]
- Hemihoplites, Spath 1924 [Hemihoplitidae]
- Hemiindocrinus, Yakovlev 1927 [Cladida]
- Hemikaolishania, Zhang 1983 [Corynexochida]
- Hemikrithe [Podocopida]
- Hemilampronites, Geinitz 1868 [Beloniformes]
- Hemilecanites, L. F. Spath 1934 [Hemilecanitidae]
- Hemilepton, Cossmann 1911 [Erycinidae]
- Hemilistrona [Conodontophorida]
- Hemilytoceras, Spath 1927 [Lytoceratidae]
- Hemimactra, Swainson 1840 [Mactridae]
- Hemimollocrinus, Yakovlev 1930 [Cladida]
- Heminajas [Myophoriidae]
- Heminautilus, Spath 1927 [Cenoceratidae]
- Heminematopora, Bassler 1952 [Arthrostylidae]
- Hemingwayella [Podocopida]
- Hemiparacytheridea [Podocopida]
- Hemipecten, Adams 1849 [Propeamussiidae]
- Hemipedina [Pedinidae]
- Hemiphlactella [Cheilostomata]
- Hemiphragma, Ulrich 1893 [Trematoporidae]
- Hemiphragmoceras, Hyatt in Zittel 1900 [Hemiphragmoceratidae]
- Hemipiloceras, Shimizu et al. [Cephalopoda]
- Hemiplasmopora [Anthozoa]
- Hemiplax [Decapoda]
- Hemiplethorhynchus, von Peetz 1898 [Trigonirhynchiidae]
- Hemipleurotoma [Turridae]
- Hemiplicatula [Sacoglossa]
- Hemipneustes [Holasteridae]
- Hemiporites, Alloiteau 1952 [Faviidae]
- Hemipronites, Pander 1830 [Clitambonitidae]
- Hemiptychoceras, Spath 1925 [Hamitidae]
- Hemirhabdorhynchus, Casier 1946 [Istiophoridae]
- Hemirhamphus, Voigt 1832 [Hemiramphidae]
- Hemirhodon, Raymond 1937 [Dolichometopidae]
- Hemirobulina [Foraminifera]
- Hemisaurida [Alepisauriformes]
- Hemiscyllium, Smith 1837 [Hemiscylliidae]
- Hemiseptella [Calloporidae]
- Hemisimoceras [Simoceratidae]
- Hemismittina [Cheilostomata]
- Hemisphaerammina [Hemisphaeramminidae]
- Hemisphaerocoryphe, Reed 1896 [Cheiruridae]
- Hemisquilla [Stomatopoda]
- Hemisterias [Bivalvia]
- Hemistreptacron, Yakovlev 1926 [Cladida]
- Hemistreptocrinus [Crinoidea]
- Hemistringocephalus [Stringocephalidae]
- Hemistylus [Cheilostomata]
- Hemisurcula, Casey 1904 [Turridae]
- Hemitetragonites, Spath 1927 [Lytoceratidae]
- Hemithalamocyathus [Ajacicyathida]
- Hemithiris, d'Orbigny 1847 [Hemithirididae]
- Hemithurammina [Foraminifera]
- Hemithylus [Phymosomatidae]
- Hemithyropsis [Tetrarhynchiidae]
- Hemitissotia [Vascoceratidae]
- Hemitoechia, Nikiforova 1970 [Trigonirhynchiidae]
- Hemitoma, Swainson 1840 [Fissurellidae]
- Hemitrypa [Fenestrata]
- Hemitrypella [Fenestellidae]
- Hemiulrichostylus [Cryptostomata]
- Hemlebenia [Foraminifera]
- Hemsiella [Palaeocopida]
- Henadoparia, Opik 1967 [Ptychopariida]
- Henaniodus [Problematica]
- Hengestites [Placenticeratidae]
- Hengnania [Pachycormiformes]
- Hennigopora [Cystoporata]
- Henningsmoenia [Palaeocopida]
- Henningsmoenicaris [Arthropoda]
- Henricellum, O. Wilckens 1937 [Girtyocoeliidae]
- Henryhowella [Podocopida]
- Hensonella [Problematica]
- Hensonia [Foraminifera]
- Hensonina [Foraminifera]
- Heosomocelypha [Problematica]
- Hepatella, Smith 1969 [Aethridae]
- Hepatinulus, Ristori 1886 [Leucosiidae]
- Hepatiscus, Bittner 1875 [Aethridae]
- Hepatus, Latreille 1802 [Hepatidae]
- Heptabronteus, Webby 1974 [Styginidae]
- Heptaloculites [Podocopida]
- Heptanema, Belloti 1857 [Mawsoniidae]
- Heptranchias, Rafinesque 1810 [Hexanchidae]
- Heraclites, E. v. Mojsisovics [Heraclitidae]
- Heraclitites, E. v. Mojsisovics [unclassified genus]
- Heracloceras, Teichert 1940 [Nephriticeratidae]
- Heracrinus, Prokop 1977 [Crinoidea]
- Heraultipegma, J. Pojeta and B. Runnegar 1976 [Stenothecidae]
- Herbstia, H. Milne-Edwards 1834 [Epialtidae]
- Hercantyx, Opik 1963 [Trilobita]
- Hercoceras, Barrande 1865 [Rutoceratidae]
- Hercochitina [Rhizopodea]
- Hercocrinus, Hudson 1907 [Parablastoidea]
- Hercocyrtoceras, Foerste 1927 [Acleistoceratidae]
- Hercodon [Cardiida]
- Hercoglossa, Conrad 1866 [Hercoglossidae]
- Hercoglossoceras [Nautilida]
- Hercolepadida, order, Dzik 1986 [Machaeridia]
- Hercolepas, Withers 1915 [Hercolepadida]
- Hercophyllum, Jones 1936 [Lykophyllidae]
- Hercorhynchus [Neogastropoda]
- Hercorhyncus (Haplovoluta) (Wade 1918) [Fasciolariidae]
- Hercostrophia [Douvillinidae]
- Hercynobolbina [Palaeocopida]
- Hercynocythere [Podocopida]
- Hercynolepis, Gross 1973 [Orodontidae]
- Herentia [Escharinidae]
- Hergetatrypa [Carinatinidae]
- Hergottella [Foraminifera]
- Heritschiella, Moore and Jeffords 1956 [Waagenophyllidae]
- Heritschioides, Yabe 1950 [Durhaminidae]
- Herkimeroceras, Foerste 1926 [Jovellaniidae]
- Hermania, Monterosato 1884 [Cephalaspida]
- Hermanites, Puri 1955 [Hemicytheridae]
- Hermatoporella, Khromych 1969 [Trupetostromatidae]
- Hermatostroma, Nicholson 1886 [Trupetostromatidae]
- Hermatostromella, Khalfina 1961 [Trupetostromatidae]
- Hernandezaster [Hemiasteridae]
- Heroldina [Archaeostraca]
- Heronallenia [Foraminifera]
- Herouvalia [Cardiida]
- Herpetocrinus, Salter 1873 [Crinoidea]
- Herpetopoma, Pilsbry 1890 [Calliotropidae]
- Herpetopora, Lang 1914 [Electridae]
- Herpolitha, Eschscholtz 1825 [Fungiidae]
- Herreraster [Brissidae]
- Herrigocyther [Podocopida]
- Herrmannina, Kegel 1933 [Leperditicopida]
- Hertha, Hagenow 1840 [Comatulida]
- Hertleinites, Inlay 1958 [Polyptychitidae]
- Hertzina [Conodonta]
- Herzogina, Chavan 1950 [Astartidae]
- Hescheleria, Peyer 1936 [Thalattosauria]
- Hesionites [Polychaeta]
- Heslingtonia [Trigoniida]
- Hesperaster [Clypeasteroida]
- Hesperibalanus, Pilsbry 1916 [Archaeobalanidae]
- Hesperidella [Palaeocopida]
- Hesperithyris [Hesperithyrididae]
- Hesperiturris, J. A. Gardner 1945 [Turridae]
- Hesperoceras, Miller and Youngquist 1947 [Cephalopoda]
- Hesperocoelia, Bassler 1927 [Streptosolenidae]
- Hesperocystis, Sinclair 1945 [Rhombifera]
- Hesperonomia, Ulrich and Cooper 1936 [Hesperonomiidae]
- Hesperonomiella [Hesperonomiidae]
- Hesperopora [Cheilostomata]
- Hesperorhynchia [Cyclothyrididae]
- Hesperornithiformes, order, Fürbringer 1888 [Aves]
- Hesperorthis, Schuchert and Cooper 1931 [Hesperorthidae]
- Hesperotrophia [Tetralobulidae]
- Hessenhausia [Stringocephalidae]
- Hesslandella [Palaeocopida]
- Hesslandites [Podocopida]
- Hesslandona [Ostracoda]
- Hesslerella [Isopoda]
- Hetcochitina [Rhizopodea]
- Heteractaea, Lockington 1877 [Xanthidae]
- Heteractinida, class, Hinde 1888 [Porifera]
- Heteractis [Cheilostomata]
- Heterantyx [Foraminifera]
- Heteraster [Toxasteridae]
- Heterastraea, Tomes 1888 [Oppelismiliidae]
- Heterastridium, Reuss 1865 [Heterastrididae]
- Heterdontoides [Conodonta]
- Heterelasma, Grabau 1922 [Antiphyllidae]
- Heterillina [Hauerinidae]
- Heterma [Metacopida]
- Heteroaspis [Chasmataspidida]
- Heteroblastus, R. Etheridge and P. H. Carperter 1886 [Spiraculata]
- Heterobrissus, Manzoni and Mazzetti 1877 [Asterostomatidae]
- Heterocaninia, Yabe and Hayasaka 1920 [Aulophyllidae]
- Heterocaryon, Raymond 1937 [Harpetidae]
- Heterocella [Vinculariidae]
- Heteroceras, d'Orbigny 1849 [Heteroceratidae]
- Heterochiton [Ischnochitonidae]
- Heterocidaris [Heterocidaridae]
- Heterocithara, Hedley 1922 [Turridae]
- Heterocoenia, Milne-Edwards and Haime 1848 [Heterocoeniidae]
- Heteroconopeum, E. Voigt 1983 [Electridae]
- Heterocorallia, order, Schindewolf 1941 [Anthozoa]
- Heterocoskinolina [Foraminifera]
- Heterocrinus, Hall 1872 [Heterocrinidae]
- Heterocrisina [Cyclostomata]
- Heterocrypta [Decapoda]
- Heterocyathus, Milne-Edwards and Haime 1848 [Caryophylliidae]
- Heterocyclopyge, Marek 1961 [Cyclopygidae]
- Heterocyprideis [Podocopida]
- Heterocystites [Rhombifera]
- Heterocythereis [Podocopida]
- Heterodiadema, Cotteau 1864 [Pseudodiadematidae]
- Heterodiscus [Hippuritida]
- Heterodonax, Morch 1853 [Psammobiidae]
- Heterodontiformes, order, Berg 1940 [Chondrichthyes]
- Heterodontus, de Blainville 1816 [Heterodontidae]
- Heterogyrella [Cerithiidae]
- Heterohaplooecia [Cyclostomata]
- Heterohelix [Heterohelicidae]
- Heterolampas [Hemiasteridae]
- Heterolasma, Ehlers 1919 [Ketophyllidae]
- Heterolepa, Franzenau 1884 [Heterolepidae]
- Heterolepidotus, Egerton 1872 [Eugnathidae]
- Heterolimulus [Xiphosurida]
- Heteromacoma, Habe 1952 [Tellinidae]
- Heterometra, Clark 1909 [Comatulida]
- Heteromorphina [Foraminifera]
- Heteropecten [Heteropectinidae]
- Heteropedina [Diadematoida]
- Heteropetalus [Debeeriidae]
- Heterophaulactis, Yü 1974 [Cyathophyllidae]
- Heteropholas [Myoida]
- Heterophrentis, Billings 1875 [Amplexidae]
- Heterophyllia, McCoy 1849 [Heterophylliidae]
- Heterophyllia (Heterophylloides), Schindewolf 1941 [Heterophylliidae]
- Heteropis [Cardiida]
- Heteropora, de Blainville 1830 [Cerioporidae]
- Heteroporella [Cyclostomata]
- Heteropsammia, Milne-Edwards and Haime 1848 [Dendrophylliidae]
- Heteroptygmatis, Shikama and Yui 1973 [Gastropoda]
- Heteroraphidites, Schrammen 1901 [Cephaloraphiditidae]
- Heterorthella [Heterorthidae]
- Heterorthina, B. B. Bancroft 1928 [Heterorthidae]
- Heterorthis [Heterorthidae]
- Heterosalenia, Cotteau [Acrosaleniidae]
- Heteroschisma, C. Wachsmuth 1883 [Codasteridae]
- Heterosculpotheca [Problematica]
- Heterosestrum [Spumellaria]
- Heterospaeroma [Isopoda]
- Heterospira, Koken 1897 [Lacunidae]
- Heterospongia [Demospongea]
- Heterospongophyllum, Huang and Kong 1978 [Spongophyllidae]
- Heterostegina, d'Orbigny 1826 [Nummulitidae]
- Heterostella [Heteractinida]
- Heterosteus, Asmuss 1856 [Chelonichthyidae]
- Heterostinia, Zittel 1878 [Pleromatidae]
- Heterostomella [Foraminifera]
- Heterostrea [Pterioida]
- Heterostrophia, order [Gastropoda]
- Heterostrophus, Wagner 1859 [Semionotiformes]
- Heterothrissa [Ctenothrissiformes]
- Heterotissotia, Peron 1897 [Tissotiidae]
- Heterotorpedo, Ward 1983 [Myliobatiformes]
- Heterotrichina [Spirotrichia]
- Heterotrigonia [Trigoniida]
- Heterotrypa, Nicholson 1879 [Heterotrypidae]
- Hexacanthopora [Cheilostomata]
- Hexachorda [Muricidae]
- Hexacladus [Spumellaria]
- Hexaclymenia, Schindewolf 1923 [Cyrtoclymeniidae]
- Hexacontium, Haeckel 1881 [Hexalonchidae]
- Hexacosta, Farsan 1981 [Phacopida]
- Hexacrinites, T. Austin and T. Austin 1843 [Hexacrinitidae]
- Hexacromyum [Spumellaria]
- Hexactinella, Carter 1885 [Tretodictyidae]
- Hexactinellida, class, Schmidt 1870 [Porifera]
- Hexactinosa, order, Schrammen 1903 [Hexactinellida]
- Hexadoras [Spumellaria]
- Hexaglauconia, Mennessier 1984 [Cassiopidae]
- Hexagonaria, Gürich 1896 [Disphyllidae]
- Hexagonites, Hayasaka 1947 [Tainoceratidae]
- Hexalasma, Soshkina 1928 [Polycoeliidae]
- Hexaloncharium [Spumellaria]
- Hexalonche, Haeckel 1881 [Hexalonchidae]
- Hexameroceras, Hyatt 1884 [Hemiphragmoceratidae]
- Hexanchiformes, order, de Buen 1926 [Chondrichthyes]
- Hexanchus, Rafinesque 1810 [Hexanchidae]
- Hexangulaconularia [Scyphozoa]
- Hexaphyllia, Shtukenberg 1904 [Heterophylliidae]
- Hexaplex, Perry 1811 [Muricidae]
- Hexaporites [Trepostomida]
- Hexapus, De Haan 1833 [Hexapodidae]
- Hexasaturnalis, Kozur and Mostler 1983 [Saturnalidae]
- Hexaspyris, Haeckel 1887 [Triospyrididae]
- Hexastylarium [Spumellaria]
- Hexastylostroma [Stromatoporoidea]
- Hexastylus, Haeckel 1881 [Hexastylidae]
- Hexatarsostinus, Hawkins 1840 [Sauropterygia]
- Hexatractiella, Mehl 1996 [Reticulosa]
- Hexelasma, Lang et al. 1940 [Pachylasmatidae]
- Hexianella, Zhang 1983 [Proetida]
- Hexismia, Sokolov 1955 [Halysitidae]
- Hexites [Arthrostylidae]
- Hexitheca [Orthothecida]
- Heymonsicambria [Maxillopoda]
- Heyuncunoceras [Cephalopoda]
- Hezhangophyllum, Kong 1978 [Ptenophyllidae]
- Hezhouphyllum [Anthozoa]
- Hiantopora [Hiantoporidae]
- Hiatella, Daudin 1801 [Hiatellidae]
- Hiatobairdia, Kristan-Tollmann 1970 [Bairdiidae]
- Hiatula [Cardiida]
- Hibbardella [Conodonta]
- Hibbardia, Kesling 1953 [Beyrichiidae]
- Hibbertia, Jones and Woodward 1898 [Harpetidae]
- Hibbertopterus [Eurypterida]
- Hibernicoceras, Moore and Hodson 1958 [Goniatitidae]
- Hibernodonta [Rafinesquinidae]
- Hibolites [Belemnitida]
- Hicetes [Serpulimorpha]
- Hicksia, Delgado 1904 [Trilobita]
- Hidaella [Foraminifera]
- Hidascutellum, Kobayashi and Hamada 1977 [Ptychopariida]
- Hidina [Foraminifera]
- Hiemalora, Fedonkin 1982 [Cnidaria]
- Highgatella, Shaw 1955 [Olenidae]
- Higumastra, Baumgartner 1980 [Hagiastridae]
- Hijitrigonia, Kobayashi 1955 [Myophorellidae]
- Hikelaster [Brissidae]
- Hilberia, von Teppner 1922 [Pectinidae]
- Hilda, Hoernes and Auinger 1884 [Buccinidae]
- Hildaites [Hildoceratidae]
- Hildaphillipsia, Hahn 1972 [Phillipsiidae]
- Hildebrandia, Jordan and Evermann 1927 [Congridae]
- Hildoceras [Hildoceratidae]
- Hildoceratoides [Hildoceratidae]
- Hildoglochiceras [Haploceratidae]
- Hilgardella, L. W. Stephenson 1957 [Mytilidae]
- Hilgardia, Harris 1946 [Nuculanidae]
- Hillaepora, Mironova 1960 [Pachyporidae]
- Hillaxon, Rozkowska 1969 [Laccophyllidae]
- Hillius, Bishop 1983 [Cyclodorippidae]
- Hillmeria [Palaeocopida]
- Hillophyllum, Webby 1971 [Tryplasmatidae]
- Hiltermannella [Foraminifera]
- Hiltermannicythere [Podocopida]
- Hima, Leach 1852 [Nassariidae]
- Himalayites [Himalayitidae]
- Himantoceras, Thieuloy 1965 [Himantoceratidae]
- Himatella, Zittel 1878 [Sestrostomellidae]
- Himavatites, C. Diener 1906 [Tibetitidae]
- Himeraelites, Stefano 1889 [Caprinulidae]
- Himerocrinus, Springer 1921 [Monobathrida]
- Himerometra, Clark 1907 [Comatulida]
- Himispiticeras [Cephalopoda]
- Hinaclema, Sakagami and Sugimura 1987 [Trepostomida]
- Hincksina, Norman 1903 [Flustridae]
- Hincksipora [Hincksiporidae]
- Hindeastraea, White 1888 [Siderastreidae]
- Hindenites [Eunicemorpha]
- Hindeoceras, Flower 1945 [Rutoceratidae]
- Hindeodelloides [Conodontophorida]
- Hindeodina [Conodontophorida]
- Hindeodus [Ozarkodinida]
- Hindeoprion [Eunicemorpha]
- Hindermeyeria, Hupe 1953 [Ptychopariida]
- Hindsiella [Sportellidae]
- Hinemoana [Cardiida]
- Hinganastraea [Anthozoa]
- Hinganella [Chilidiopsidae]
- Hingganoleptaena [Rafinesquinidae]
- Hinnites, Defrance 1821 [Pectinidae]
- Hintzesnonaia [Hexactinellida]
- Hintzespongia, Rigby and Gutschick 1976 [Hintzespongiidae]
- Hintziella [Palaeocopida]
- Hippadenella [Cheilostomata]
- Hippalimus [Demospongea]
- Hippaliosina [Cheilostomata]
- Hipparionix [Chilidiopsidae]
- Hipparionoceras, Flower 1945 [Polyelasmoceratidae]
- Hipperechonella [Cheilostomata]
- Hippiopora [Cheilostomata]
- Hippocampoides, Wade 1916 [Euomphalidae]
- Hippocampus, Rafinesque 1810 [Syngnathidae]
- Hippochaeta [Malleidae]
- Hippocrepina, Parker in Dawson 1870 [Hyperamminidae]
- Hippocrepinella [Hippocrepinellidae]
- Hippocystis [Diploporita]
- Hippodiplosia, Canu 1916 [Bryocryptellidae]
- Hippoexechonella [Cheilostomata]
- Hippoglossoides, Gottsche 1835 [Pleuronectidae]
- Hippolyrula [Romancheinidae]
- Hippomenella [Romancheinidae]
- Hippomonavella [Schizoporellidae]
- Hippomya, Salter 1864 [Modiomorphidae]
- Hipponicharion, Mathew 1886 [Hipponicharionidae]
- Hipponyx, Defrance 1819 [Hipponicidae]
- Hippopharangites, Bengtson 1990 [Sachitida]
- Hippophylactella [Cheilostomata]
- Hippopleurifera, Canu and Bassler 1927 [Romancheinidae]
- Hippopodina, Levinsen 1909 [Hippopodinidae]
- Hippopodinella [Hippoporidridae]
- Hippopodium, Sowerby 1819 [Hippopodiidae]
- Hippoporella [Phidoloporidae]
- Hippoporidra, Canu and Bassler 1927 [Hippoporidridae]
- Hippoporina, Neviani 1895 [Bitectiporidae]
- Hippopozoon [Phidoloporidae]
- Hippopus, Lamarck 1799 [Cardiidae]
- Hipposera [Cheilostomata]
- Hippothoa [Hippothoidae]
- Hippozeugosella [Cheilostomata]
- Hippula [Palaeocopida]
- Hippuritella, Douvillé 1908 [Hippuritidae]
- Hippurites, Lamarck 1801 [Hippuritidae]
- Hircinisca [Septatrypidae]
- Hiregiroceras [Oncocerida]
- Hirneacrinus, Frest and Strimple 1977 [Hirneacrinidae]
- Hiromurex [Neogastropoda]
- Hiroshimaphyllum, Kato and Minato 1974 [Pseudopavonidae]
- Hirschmannia, Elofson 1941 [Loxoconchidae]
- Hirsonella, Fischer 1969 [Sorbeoconcha]
- Hirsutella [Bittnerulidae]
- Hirsutocythere [Podocopida]
- Hirsutodontus [Conodontophorida]
- Hirsutograptus [Graptoloidea]
- Hirsutospirella [Foraminifera]
- Hirudocidaris [Cidaroida]
- Hirudopsis [Polychaeta]
- Hisingerella, Henningsmoen 1948 [Acrotretidae]
- Hispaniaspis, Hammann 1992 [Odontopleuridae]
- Hispanirhynchia [Hispanirhynchiidae]
- Hispidaria [Echinospiriferidae]
- Hispidaspis [Lamniformes]
- Hispidocrinus [Isocrinida]
- Hispidofusus [Neogastropoda]
- Hispidopetra [Demospongea]
- Histiastrum, Ehrenberg 1847 [Larnacillidae]
- Histina [Palaeocopida]
- Histiodella [Conodonta]
- Histiomona, Opik 1967 [Odontopleurida]
- Histocidaris, Mortensen 1903 [Rhabdocidaridae]
- Histocrinus, Kirk 1940 [Scytalocrinidae]
- Histopomphus [Foraminifera]
- Historbitoides [Foraminifera]
- Histosyrinx [Syringothyrididae]
- Hithis [Palaeocopida]
- Hiwia [Neogastropoda]
- Hlawiceras [Cephalopoda]
- Hodsia [Hexactinellida]
- Hodsonites, Ramsbottom 1977 [Ramositidae]
- Hoegisphaera [Rhizopodea]
- Hoeglundina, Brotzen 1948 [Rotaliidae]
- Hoekaspis, Kobayashi 1937 [Asaphidae]
- Hoeninghausia, Gurich 1896 [Koenenitidae]
- Hoepenites [Pachydiscidae]
- Hoernesarca, Malatesta 1974 [Arcidae]
- Hoernesiella [Pterioida]
- Hoeverella [Cheilostomata]
- Hoferia, Bittner 1894 [Limopsidae]
- Hoffetella, Hupé 1953 [Dolichometopidae]
- Hofkerina [Foraminifera]
- Hofkeruva [Foraminifera]
- Hogmochilina, Solle 1935 [Leperditicopida]
- Hokonuia [Pterioida]
- Holacanthopora, Le Maître 1954 [Micheliniidae]
- Holasaphus, Matthew 1895 [Ptychopariida]
- Holaster, Agassiz 1836 [Holasteridae]
- Holasterella [Reticulosa]
- Holcacephalus, Resser 1938 [Norwoodiidae]
- Holcobelus [Belemnitida]
- Holcocarcinus, Withers 1924 [Carpiliidae]
- Holcocrinus, Kirk 1945 [Cladida]
- Holcodiscoides [Kossmaticeratidae]
- Holcodiscus, Uhlig 1882 [Holcodiscidae]
- Holcodus, Gibbes 1850 [Plioplatecarpidae]
- Holcolissoceras [Phylloceratitida]
- Holcolytoceras [Lytoceratidae]
- Holconautilus, Mojsisovics 1902 [Tainoceratidae]
- Holcophylloceras, Spath 1927 [Phylloceratidae]
- Holcopneustes [Hemiasteridae]
- Holcopocythere [Podocopida]
- Holcoptychites [Holcodiscidae]
- Holcospirifer [Delthyrididae]
- Holcospongia, Hinde 1893 [Stellispongiidae]
- Holcostephanus (Neumayr 1875) [Cephalopoda]
- Holdenius, Dunkle and Bungart 1942 [Arthrodira]
- Holectypus [Holectypidae]
- Holkeria [Foraminifera]
- Hollandina [Foraminifera]
- Hollandites, C. Diener 1905 [Beyrichitidae]
- Hollardia, Alberti 1964 [Tropidocoryphidae]
- Hollardiella, Drot 1967 [Spiriferida]
- Hollardosteus [Arthrodira]
- Hollina [Palaeocopida]
- Hollinella [Hollinellidae]
- Holmanella [Foraminifera]
- Holmdalia, Robison 1988 [Ptychopariida]
- Holmesella [Chondrichthyes]
- Holmia, Matthew 1890 [Holmiidae]
- Holmiceras, Hyatt 1894 [Lituitidae]
- Holmicrusta [Crustoidea]
- Holmiella, Fritz 1972 [Holmiidae]
- Holmipterus [Eurypterida]
- Holmitheca [Tetrathecidae]
- Holmograptus [Graptoloidea]
- Holmophyllum, Wedekind 1927 [Holmophyllidae]
- Holocentrites, Conrad 1941 [Beryciformes]
- Holocephalina, Salter 1864 [Conocoryphidae]
- Holocoelia [Porifera]
- Holoconularia [Scyphozoa]
- Holocrinus, Wachsmuth and Springer 1886 [Isocrinida]
- Holocryptocapsa, Tan Sin Hok 1927 [Williriedellidae]
- Holocrytocanium (Dumitrica 1970) [Williriedellidae]
- Holocystites, Hall 1864 [Holocystitidae]
- Holodictyon [Demospongea]
- Holodipterus, White and Moy-Thomas 1940 [Dipteriformes]
- Holoeciscus, Foreman 1963 [Holoeciscidae]
- Holograptus [Graptoloidea]
- Hologyra, Koken 1892 [Cycloneritimorpha]
- Holonema, Newberry 1890 [Arthrodiriformes]
- Holophragma, Lindström 1896 [Lykophyllidae]
- Holoporella, Waters 1909 [Lepraliellidae]
- Holopterygius [Coelacanthiformes]
- Holoptychus [Coelacanthiformes]
- Holopus, Orbigny 1837 [Cyrtocrinida]
- Holoretiolites [Graptoloidea]
- Holorhynchus, Kiaer 1902 [Virgianidae]
- Holostegopora [Cheilostomata]
- Holothuropsis [Aspidochirotida]
- Holotrachelus, Holm 1898 [Holotrachelidae]
- Holtedahlites, Solle 1936 [Leperditicopida]
- Holteria, Walcott 1924 [Corynexochida]
- Holynatrypa [Lissatrypidae]
- Holynetes [Anopliidae]
- Holynocrinus, Bouška 1948 [Crinoidea]
- Holyoakia, Palmer and Rowell 1995 [Emuellidae]
- Holzapfelia [Neogastropoda]
- Holzapfeloceras, Miller 1932 [Sobolewiidae]
- Holzbergia, Torrens 1971 [Tulitidae]
- Homacanthus, Agassiz 1845 [Acanthodii]
- Homagnostoides, Kobayashi 1939 [Metagnostidae]
- Homagnostus, Howell 1935 [Agnostidae]
- Homaliarhynchia [Norellidae]
- Homalina, Stoliczka 1870 [Tellinidae]
- Homaloceras, Whiteaves 1891 [Centroceratidae]
- Homalocrinus [Sagenocrinida]
- Homalohedra [Foraminifera]
- Homalonotus, König 1825 [Homalonotidae]
- Homalophyllites, Easton 1944 [Zaphrentoididae]
- Homalophyllum, Simpson 1900 [Streptelasmatidae]
- Homalopoma, Carpenter 1864 [Turbinidae]
- Homalopteon, Salter 1867 [Nileidae]
- Homalopyge, Jaanusson 1956 [Asaphida]
- Homalostega [Cheilostomata]
- Homaloteuthis [Belemnitida]
- Homaphrodites [Phyllodocemorpha]
- Homarus, Weber 1795 [Nephropidae]
- Homaspidella [Pteraspidomorphes]
- Homelys, Von Meyer 1862 [Decapoda]
- Homeocardiorhynchus [Hebetoechiidae]
- Homeoceratopsis [Palaeocopida]
- Homeokiesowia [Palaeocopida]
- Homerites, E. v. Mojsisovics 1893 [Tropitidae]
- Homoadelphoceras, Foerste 1926 [Rutoceratidae]
- Homoceras, J. J. Sepkoski 2002 [Homoceratidae]
- Homoceratoides, Bisat 1924 [Ramositidae]
- Homocrinus, Hall 1852 [Homocrinidae]
- Homoctenida, order, B. Boucek 1964 [Tentaculita]
- Homoctenowakia, Alberti 1984 [Paranowakiidae]
- Homoctenus, Ljaschenko 1955 [Homoctenidae]
- Homocystites, Barrande 1887 [Rhombifera]
- Homodictya, Raymond 1937 [Kingstoniidae]
- Homoeaster [Palaeostomatidae]
- Homoeoparonaella, Baumgartner 1980 [Patulibracchiidae]
- Homoeopetalus [Spatangoida]
- Homoeoplanulites [Perisphinctidae]
- Homoeospira, Hall and Clarke 1893 [Rhynchospirinidae]
- Homoeospirella, Amsden 1968 [Rhynchospirinidae]
- Homoiostelea, class [Echinodermata]
- Homoiranognathus [Conodontophorida]
- Homolodromia, A. Milne-Edwards 1880 [Homolodromiidae]
- Homonotichthys, Whitley 1933 [Polymixiiformes]
- Homophyllia, Bruegemann 1877 [Mussidae]
- Homorhynchus, Van Beneden 1873 [Palaeorhynchidae]
- Homostelea, class [Echinodermata]
- Homotelus, Raymond 1920 [Asaphidae]
- Homotrema [Homotrematidae]
- Homotreta, Bell 1941 [Acrotretidae]
- Homotrypa, Ulrich 1882 [Monticuliporidae]
- Homotrypella, Ulrich 1886 [Monticuliporidae]
- Honeoyea, Clarke 1904 [Lunulacardiidae]
- Honggulosma [Anthozoa]
- Hontorialosia [Strophalosiidae]
- Hopkinsina, Howe and Wallace 1932 [Uvigerinidae]
- Hopkinsinella [Foraminifera]
- Hoplichthys, Cuvier and Valenciennes 1829 [Scorpaeniformes]
- Hoplikosmokas [Cephalopoda]
- Hoplitaechmella [Microporidae]
- Hoplites [Hoplitidae]
- Hoplitoides, von Koenen 1898 [Coilopoceratidae]
- Hoplitoplacenticeras, Paulcke 1906 [Placenticeratidae]
- Hoplobrotula, Gill 1864 [Ophidiidae]
- Hoplocardioceras [Cardioceratidae]
- Hoplocheilina [Cheilostomata]
- Hoplocrinus, Grewingk 1867 [Hybocrinidae]
- Hoplocrioceras, Spath 1924 [Acrioceratidae]
- Hoploparia, McCoy 1849 [Nephropidae]
- Hoploscaphites, Nowak 1911 [Scaphitidae]
- Hoplostethus, Cuvier and Valenciennes 1829 [Beryciformes]
- Hoplostraca, order, Schram 1973 [Malacostraca]
- Hoplotropites, L. F. Spath 1929 [Tropitidae]
- Hoplunnis, Kaup 1860 [Anguilliformes]
- Hopolichoides [Lichida]
- Hopora [Cheilostomata]
- Horioceras [Oppeliidae]
- Horiopleura, Douvillé 1889 [Polyconitidae]
- Hormerella [Cheilostomata]
- Hormocrinus [Sagenocrinida]
- Hormograptus [Crustoidea]
- Hormomya, Mörch 1853 [Mytilidae]
- Hormosina [Hormosinidae]
- Hormosinella [Hormosinidae]
- Hornera, Lamouroux 1821 [Horneridae]
- Hornibrookella [Podocopida]
- Hornsundia, Fedorowski 1965 [Bothrophyllidae]
- Horrificiella [Podocopida]
- Hortia [Conidae]
- Hosieocrinus, Wright 1952 [Cladida]
- Hospes, Stubblefield and Bulman 1927 [Trilobita]
- Hospitella [Foraminifera]
- Hostimex [Trigonirhynchiidae]
- Hottingerella [Foraminifera]
- Hottingerina [Meandropsinidae]
- Hottingerita [Foraminifera]
- Houdasia [Archaeogastropoda]
- Houershanophyllum, Yü and Liao 1978 [Cyathophyllidae]
- Houiblastus [Spiraculata]
- Houlongdongella, Li 1975 [Archaeocopida]
- Houmengia, Qiu 1983 [Ptychopariida]
- Hourcquia [Hourcquiinae]
- Hourqia [Podocopida]
- Houscolex [Cricocosmiidae]
- Housia, Walcott 1916 [Pterocephaliidae]
- Houzeauia [Neogastropoda]
- Houzeauina [Smittinidae]
- Howchinella [Foraminifera]
- Howchinia [Lasiodiscidae]
- Howeina [Podocopida]
- Howellites, Bancroft 1945 [Dalmanellidae]
- Howellitubus [Serpulimorpha]
- Howelloidea [Delthyrididae]
- Howelluella, Hupe 1960 [Trilobita]
- Howittia [Echinospiriferidae]
- Hoyacrinus, Delogu and Nicosia 1986 [Cyrtocrinida]
- Hoyenella, Rettori 1994 [Miliolida]
- Hoyoceras [Endocerida]
- Hsuaspis, Chang 1957 [Estaingiidae]
- Hsuchuangia, Lu and Zhu 1983 [Crepicephalidae]
- Hsuum, Pessagno 1977 [Hsuidae]
- Huaibeia, Bi 1983 [Ptychopariida]
- Huaiheceras [Ellesmerocerida]
- Huainania, Qiu 1983 [Ptychopariida]
- Huaiyuanella [Paiutiida]
- Huamiaocephalus, Qiu 1983 [Diceratocephalidae]
- Huananaxonia [Anthozoa]
- Huananochonetes, Wang et al. 1981 [Chonetidae]
- Huanghuachangoceras [Discosorida]
- Huanghuaella [Ostracoda]
- Huangia, Yabe 1950 [Waagenophyllidae]
- Huanglongophyllum, Yü 1976 [Petalaxidae]
- Huangophyllum, Tseng 1948 [Polycoeliidae]
- Huangshandongia [Arthropoda]
- Huangshandongoconus [Mollusca]
- Huanoproetus [Proetida]
- Huantraiconella [Podocopida]
- Huasha, Cheng 1986 [Ceratoikiscidae]
- Hubeiella [Verbeekinidae]
- Hubeipora [Trepostomida]
- Hubeiproductus [Productidae]
- Hubertoceras [Cephalopoda]
- Hubertschenckia [Cardiida]
- Hucho, Guenther 1866 [Salmoniformes]
- Huckea [Palaeocopida]
- Huddlella [Conodontophorida]
- Hudlestonella, Cossmann 1909 [Pseudomelaniidae]
- Hudlestonia [Hildoceratidae]
- Hudsonella, Turnsek 1966 [Parastromatoporidae]
- Hudsonelpidia, McGowan 1995 [Ichthyopterygia]
- Hudsonoceras, Moore 1946 [Girtyoceratidae]
- Hudsonospongia, Raymond and Okulitch 1940 [Streptosolenidae]
- Huenella [Huenellidae]
- Huenellina [Huenellidae]
- Hughmilleria [Eurypterida]
- Huhatanka, Feldmann and West 1978 [Decapoda]
- Huiaihecerina [Ellesmerocerida]
- Huishea [Problematica]
- Hujiagouella [Helcionellidae]
- Hukasawaia, Kobayashi 1953 [Asaphida]
- Hulenites [Kossmaticeratidae]
- Hulingsina [Podocopida]
- Humaella, Zhu 1982 [Plectambonitidae]
- Humboldtochaeta [Problematica]
- Humeia, Ormiston 1975 [Proetida]
- Humeoceras, Foerste 1925 [Humeoceratidae]
- Humilaria, U. S. Grant and Gale 1931 [Veneridae]
- Humilichthys [Ctenothrissiformes]
- Humilogriffithides, Inai 1936 [Proetida]
- Hunanella [Cardiida]
- Hunanophrentis, Sun 1958 [Disphyllidae]
- Hunanopora [Trepostomida]
- Hunanoproductus [Productidae]
- Hunanopyge, Peng 1984 [Ceratopygidae]
- Hunanospongia, Qian and Ding 1988 [Protospongiidae]
- Hundwarella, Reed 1934 [Proasaphiscidae]
- Hungaia, Walcott 1914 [Hungaiidae]
- Hungarella [Cytherideidae]
- Hungariella, Kutassy 1933 [Delphinulopsidae]
- Hungarispira [Neoretziidae]
- Hungarites, E. v. Mojsisovics 1879 [Hungaritidae]
- Hungioides, Kobayashi 1936 [Hungaiidae]
- Hungkiichthys [Pachycormiformes]
- Hunkydora, Flemming 1948 [Myochamidae]
- Hunnanocephalus [Corynexochida]
- Hunnebergia, Tjernvik 1956 [Asaphidae]
- Hunnegraptus [Dendroidea]
- Huntonella [Palaeocopida]
- Huntonia, Vandel 1973 [Dalmanitidae]
- Hunyuenoceras [Ellesmerocerida]
- Hupecyathellus [Ajacicyathida]
- Hupecyathus [Tabulacyathida]
- Hupehella [Ostracoda]
- Hupehsuchus, Young and Dong 1972 [Hupehsuchidae]
- Hupeia, Kobayashi 1944 [Ptychopariida]
- Hupeolenus, Geyer 1990 [Redlichiida]
- Hurdia [Hurdiidae]
- Huronia, Stokes 1824 [Huroniidae]
- Huroniella, Foerste 1924 [Huroniidae]
- Huso, Brandt and Ratzeburg 1833 [Acipenseridae]
- Hussakofia, Cossman 1910 [Dinichthyidae]
- Hustedia, Hall and Clarke 1893 [Neoretziidae]
- Hustedograptus [Graptoloidea]
- Hustedtiella [Neoretziidae]
- Hutsonia [Podocopida]
- Huttonechinus [Holasteroida]
- Huttoniella [Palaeocopida]
- Huxleyia, Adams 1860 [Manzanellidae]
- Hwaania [Neotaenioglossa]
- Hyala, Adams and Adams 1852 [Capulidae]
- Hyalina, Schumacher 1817 [Marginellidae]
- Hyalinea [Foraminifera]
- Hyalinonetrion, Patterson and Richardson 1988 [Lagenidae]
- Hyalocrinus [Roveacrinida]
- Hyalocylis, Fol 1875 [Cavoliniidae]
- Hyaloderma [Demospongea]
- Hyalonemia [Amphidiscosa]
- Hyalopecten, Verrill 1897 [Pectinidae]
- Hyalorisia, Dall 1889 [Phenacolepadidae]
- Hyalospongia [Demospongea]
- Hyalostelia [Heteractinida]
- Hyalotoechus [Fenestrata]
- Hyalotragos, Zittel 1878 [Discostromatidae]
- Hyas, Leach 1814 [Oregoniidae]
- Hyastenus, White 1847 [Epialtidae]
- Hyattidina, Schuchert 1913 [Hyattidinidae]
- Hyboaspis, Raymond 1920 [Illaenidae]
- Hybocladodus [Cladodontidae]
- Hybocrinida, order, Jaekel 1918 [Cladida]
- Hybocrinus, Billings 1857 [Hybocrinidae]
- Hybocystites, Wetherby 1880 [Hybocrinidae]
- Hyborhynchella [Leiorhynchidae]
- Hyderia [Foraminifera]
- Hydnoceras [Reticulosa]
- Hydnocerina [Reticulosa]
- Hydnophora, Fischer de Waldheim 1807 [Merulinidae]
- Hydnophorabacia, d'Achiardi 1875 [Agariciidae]
- Hydnoseris, Beauvais 1982 [Microsolenidae]
- Hydractinia [Tubulariae]
- Hydrallmania, Hincks 1869 [Hydroida]
- Hydrania [Ophthalmidiidae]
- Hydreionocrinus, De Koninck 1858 [Cladida]
- Hydriocrinus, Trautschold 1867 [Cladida]
- Hydriodictya, Hall and Clarke 1899 [Dictyospongiidae]
- Hydrocephalus, Barrande 1846 [Paradoxididae]
- Hydroconozoa, class [Cnidaria]
- Hydroconus [Hydroconozoa]
- Hydrocsaspedota [Trachylinida]
- Hydroida, order, Johnston 1836 [Hydrozoa]
- Hydroides [Serpulimorpha]
- Hydropessum, Broom 1909 [Perleidiformes]
- Hydroporocrinus, Arendt 1970 [Cladida]
- Hydrotribulus, B. Wade 1916 [Buccinidae]
- Hydrozoa, class, Owen 1843 [Medusozoa]
- Hygophum, Bolin 1939 [Myctophidae]
- Hylodecrinus, Kirk 1941 [Cladida]
- Hymedesmia [Poecilosclerida]
- Hymenactura [Spumellaria]
- Hymeniastrum [Spumellaria]
- Hymenocaris, Salter 1853 [Hymenostraca]
- Hymenocephalus, Giglioli 1884 [Macrouridae]
- Hymenostraca, order, Rolfe 1969 [Malacostraca]
- Hynniphoria [Aulacothyropsidae]
- Hyolithida, order, Mathew 1962 [Hyolitha]
- Hyolithomorpha, class [Hyolitha]
- Hyostragulum, Marek and Galle 1976 [Favositida]
- Hyotissa, Stenzel 1971 [Gryphaeidae]
- Hypacanthoplites, Spath 1923 [Parahoplitidae]
- Hypacanthus, Agassiz 1845 [Perciformes]
- Hypagnostus, Jaeckel 1909 [Spinagnostidae]
- Hypanis [Cardiida]
- Hypaproetus, Wu 1977 [Proetida]
- Hypechinus [Echinidae]
- Hypelasma, Paquier 1897 [Requieniidae]
- Hyperacanthus, Koken 1897 [Archaeogastropoda]
- Hyperammina, Brady 1879 [Hyperamminidae]
- Hyperamminita [Saccamminidae]
- Hyperamminoides [Astrorhizidae]
- Hyperbathoides [Ammodiscidae]
- Hyperderoceras [Eoderoceratidae]
- Hypergoniatites, Ruzhencev and Bogoslovskaya 1970 [Goniatitidae]
- Hyperlioceras [Graphoceratidae]
- Hypermecaspis, Harrington and Leanza 1957 [Olenidae]
- Hyperoblastus, Fay 1961 [Phaenoschismatidae]
- Hyperobolus [Zhanatellidae]
- Hyperoglyphe, Guenther 1859 [Perciformes]
- Hyperoparia, Zhang 1983 [Ptychopariida]
- Hyperoplus, Guenther 1862 [Perciformes]
- Hyperprosopon, Gibbons 1854 [Perciformes]
- Hyperstrophina, order, R.M. Linsley and W.M. Kier 1984 [Paragastropoda]
- Hyphantoceras, Hyatt 1900 [Nostoceratidae]
- Hyphasmaphora [Metacopida]
- Hyphasmopora [Hyphasmoporidae]
- Hyphoplites, Spath 1922 [Hoplitidae]
- Hypocassis, Iredale 1927 [Cassidae]
- Hypocladiscites, E. v. Mojsisovics 1896 [Cladiscitidae]
- Hypocrinus, Beyrich 1862 [Codiacrinidae]
- Hypodema [Archaeogastropoda]
- Hypodicranotus, Whittington 1952 [Remopleurididae]
- Hypoleiorhynchus [Rhynchonellida]
- Hypolophites, Leriche 1913 [Dasyatidae]
- Hypolophodon, Cappetta 1980 [Dasyatidae]
- Hypomesus, Gill 1862 [Osmeridae]
- Hyponeatrypa [Atrypidae]
- Hypopygurus [Nucleolitidae]
- Hyporhamphus, Gill 1860 [Hemiramphidae]
- Hyporosopora, Canu and Bassler 1929 [Plagioeciidae]
- Hyposaurus, Owen 1849 [Dyrosauridae]
- Hypotetragona [Palaeocopida]
- Hypothyra [Demospongea]
- Hypothyridina, Buckman 1906 [Hypothyridinidae]
- Hypotodus, Jaekel 1895 [Jaekelotodontidae]
- Hypotrema [Pterioida]
- Hypotrichina [Spirotrichia]
- Hypoturrilites, Dubourdieu 1953 [Turrilitidae]
- Hypoxynoticeras [Oxynoticeratidae]
- Hypoxytoma [Pterioida]
- Hypselocrinus, Kirk 1942 [Scytalocrinidae]
- Hypselonetes [Strophochonetidae]
- Hypseloterorhynchus [Pugnacidae]
- Hypsiclavus [Isorophida]
- Hypsipleura, Koken 1892 [Zygopleuridae]
- Hypsiptycha, Y. Wang 1949 [Rhynchotrematidae]
- Hypsobatis, Cappetta 1992 [Chondrichthyes]
- Hypsocormus [Pachycormiformes]
- Hypsocrinus, Springer and Slocom 1906 [Crinoidea]
- Hypsomyonia [Hypsomoniidae]
- Hypsopygaster [Cassidulidae]
- Hyptocyathus [Ajacicyathida]
- Hyrcanites, A. A. Shevyrev 1968 [Byrrangoceratidae]
- Hyrokybe, Lane 1972 [Cheiruridae]
- Hyrsinobolbina [Palaeocopida]
- Hyrtanecrinus, Broadhead and Strimple 1980 [Monobathrida]
- Hysteroceras [Discosorida]
- Hysteroconcha, Dall 1902 [Veneridae]
- Hysterohowellella [Delthyrididae]
- Hysterolenus, Moberg 1898 [Ceratopygidae]
- Hystriciola [Phyllodocemorpha]
- Hystricocythere [Podocopida]
- Hystricopora [Cheilostomata]
- Hystricurus, Raymond 1913 [Proetida]
- Iacra [Cardiida]
- Iapetognathus [Conodontophorida]
- Iatella [Podocopida]
- Ibanocrinus, Ausich 1987 [Monobathrida]
- Iberihomola [Goniodromitidae]
- Iberirhynchia [Trigonirhynchiidae]
- Iberites, A. Hyatt 1900 [Hungaritidae]
- Iberithyris, Kvakhadze 1972 [Capillithyrididae]
- Iberocrinus, Sieverts-Doreck 1951 [Monobathrida]
- Iberolepis, Mader 1986 [Cladoselachida]
- Ibexaspis, Pribyl and Vanek 1985 [Phacopida]
- Ibexocrinus, Lane 1970 [Crinoidea]
- Ibotrigonia [Trigoniidae]
- Ibukiphyllum, Kato and Minato 1974 [Pseudopavonidae]
- Icanodus, Miller 1892 [Cochliodontidae]
- Icanotia, Stoliczka 1870 [Icanotiidae]
- Icaunhelia, Beauvais 1958 [Aulastraeoporidae]
- Icelinus, Jordan 1887 [Scorpaeniformes]
- Ichangia, Chang 1965 [Estaingiidae]
- Ichnopora [Cheilostomata]
- Ichnospongia [Demospongea]
- Ichnusocyathus [Ajacicyathida]
- Ichthyoceras [Pycnodontiformes]
- Ichthyococcus, Bonaparte 1841 [Stomiatiformes]
- Ichthyocrinus [Cyathocrinitidae]
- Ichthyodectes, E. D. Cope 1870 [Ichthyodectidae]
- Ichthyokentema [Pachycormiformes]
- Ichthyolaria [Ichthyolariidae]
- Ichthyorachis [Acanthocladiidae]
- Ichthyosauria, order, de Blainville 1835 [Ichthyopterygia]
- Ichthyosaurus, Koenig 1818 [Ichthyopterygia]
- Icriocarcinus, G. A. Bishop 1988 [Goneplacidae]
- Icriodella [Balognathidae]
- Icriodus, Branson and Mehl 1938 [Icriodontidae]
- Icrioma, De Wever 1979 [Hexaporobrachiidae]
- Icriospathodus [Gondolellidae]
- Icthyocrinus [unclassified genus]
- Icthypriapus [Chimaeriformes]
- Idaeumocrinus, le Menn 1987 [Cladida]
- Idahoia, Walcott 1924 [Idahoiidae]
- Idalina [Hauerinidae]
- Idamea, Whitehouse 1939 [Pagodiidae]
- Idasola, Iredale 1915 [Mytilidae]
- Idiocidaris [Hyposaleniidae]
- Idioclema [Trepostomida]
- Idiocycloceras [Macrocephalitidae]
- Idiocythere [Podocopida]
- Idiodictyon, Laubenfels 1955 [Hexactinosa]
- Idiognathodus, Gunnell 1931 [Idiognathodontidae]
- Idiognathoides [Conodontophorida]
- Idiohamites, Spath 1925 [Anisoceratidae]
- Idiomesus, Raymond 1924 [Ptychaspididae]
- Idiophyllum, Cao 1975 [Arachnophyllidae]
- Idiorapha [Ptychopariida]
- Idiorthis [Proschizophoriidae]
- Idiospira [Septatrypidae]
- Idiostroma, Winchell 1867 [Idiostromatidae]
- Idiostrophia, Ulrich and Cooper 1936 [Camerellidae]
- Idiotrochus, Wells 1936 [Caryophylliidae]
- Idiotrypa [Trepostomida]
- Idmonea [Multisparsidae]
- Idmonella [Cyclostomata]
- Idmoneoides [Cyclostomata]
- Idoceras [Perisphinctidae]
- Idolagnostus, Opik 1967 [Agnostidae]
- Idosocrinus, Wright 1954 [Cladida]
- Idrissia, Arambourg 1954 [Stomiatiformes]
- Igdabatis, H. Cappetta 1972 [Myliobatidae]
- Iglesiella, Rasetti 1972 [Redlichiida]
- Ignara [Pterioida]
- Ignoceras [Endocerida]
- Ignoproetus, Snajdr 1977 [Tropidocoryphidae]
- Ignotifenestella [Fenestrata]
- Ignotogregatus, Zhang and Jell 1987 [Ptychopariida]
- Ignotrypa [Fenestrata]
- Igorina [Foraminifera]
- Igornella, Heyer 1969 [Palaeonisciformes]
- Iheringiella, Berg 1898 [Monophorasteridae]
- Iheringinucula [Nuculida]
- Iheringithyris, Levy 1961 [Terebratellidae]
- Ihungia, Marwick 1931 [Rissoidae]
- Ikamuius [Pristiophoriformes]
- Ikelarchimedes [Fenestrata]
- Ikella [Athyrididae]
- Ilanga [Archaeogastropoda]
- Ilarionia [Pliolampadidae]
- Ilariosmilia, Barta-Calmus 1973 [Smilotrochiidae]
- Ilba [Cirripedia]
- Ildraites [Phyllodocemorpha]
- Ilemoraspis [Cephalaspidiformes]
- Ilerdorbis [Foraminifera]
- Ilia, Leach 1817 [Leucosiidae]
- Iliella, Rukavishnikova and Popov 1980 [Spiriferida]
- Iliochione, Olsson 1961 [Veneridae]
- Ilisha, Richardson 1845 [Clupeiformes]
- Iljinicyathus [Ajacicyathida]
- Illaenoides, Weller 1907 [Styginidae]
- Illaenopsis, Salter 1865 [Nileidae]
- Illaenula, Chlupac 1977 [Phacopida]
- Illaenurus, Hall 1863 [Illaenuridae]
- Illaenus, Dalman 1827 [Illaenidae]
- Illativella [Palaeocopida]
- Illigata [Foraminifera]
- Illilepas [Cirripedia]
- Illiniichthys, Schultze and Bardack 1987 [Palaeonisciformes]
- Illyanassa [Neogastropoda]
- Ilmenia [Ambocoeliidae]
- Ilmeniopsis [Ambocoeliidae]
- Ilmenispina [Ambocoeliidae]
- Ilmenoindivisia [Ostracoda]
- Ilmocrinus, Solojeva 1984 [Monobathrida]
- Ilmospirifer [Ambocoeliidae]
- Ilowaiskya, Vyalov 1940 [Cephalopoda]
- Ilyinella [Terebratulida]
- Ilymatogyra, Stenzel 1971 [Gryphaeidae]
- Imacanthyris [Athyrididae]
- Imangdites [Palaeocopida]
- Imbrexia [Imbrexiidae]
- Imbricaria [Mitridae]
- Imbricata, order [Eocrinoidea]
- Imbricatia [Tetralobulidae]
- Imbricatospira [Atrypidae]
- Imdentistella [Meristellidae]
- Imennovia, Shurygina 1968 [Ptenophyllidae]
- Imhoffius, Chabanaud 1940 [Pleuronectiformes]
- Imhotepia [Podocopida]
- Imitatocrinus, Schmidt 1934 [Cladida]
- Imitoceras, Schindewolf 1923 [Prionoceratidae]
- Imlayiceras, Leanza 1967 [Pseudotissotidae]
- Immanitas, Palmer 1928 [Caprinuloideidae]
- Immergentia [Immergentiidae]
- Immersothorax, Dumitrica 1970 [Williriedellidae]
- Imocaris [Decapoda]
- Imperatoria, De Gregorio 1930 [Preperonidellidae]
- Impiacus [Productellidae]
- Implexina [Martiniidae]
- Implicaticystis [Comarocystitida]
- Implicophyllum, Sytova 1966 [Ptychophyllidae]
- Imponodictyon [Stromatoporoidea]
- Inachus, Weber 1795 [Inachidae]
- Inacyathella [Ajacicyathida]
- Inaequalina, Terquem 1878 [Miliolida]
- Inaequalis [Lobothyrididae]
- Inaigymnites, Y. N. Bando 1967 [Gymnitidae]
- Inanibigutta, Nazarov 1988 [Inaniguttidae]
- Inanigutta, Nazarov and Ormiston 1984 [Inaniguttidae]
- Inanihella, Nazarov and Ormiston 1984 [Inaniguttidae]
- Inarticulata, class, T. H. Huxley 1869 [Brachiopoda]
- Inauris [Astrorhizidae]
- Incacardium [Cardiidae]
- Incaia, Whittard 1955 [Trinucleidae]
- Incanopsis [Arcida]
- Incilaster, Finlay 1926 [Turbinidae]
- Incisilabium [Archaeogastropoda]
- Incisopyge, Pillet and Courtessole 1985 [Cyclopygidae]
- Incisoscutum, Dennis and Miles 1981 [Arthrodira]
- Incisurella [Metacopida]
- Inclytoceras [Tarphycerida]
- Incongruellina [Podocopida]
- Inconobotopora [Cystoporata]
- Incorthis [Heterorthidae]
- Incurvocyathus [Ajacicyathida]
- Independatrypa [Atrypidae]
- Indiana, Mathew 1902 [Indianidae]
- Indigia [Schrenkiellidae]
- Indigirophyllites, Y. N. Popov 1961 [Ussuritidae]
- Indiophyllum [Anthozoa]
- Indivisia [Indivisiidae]
- Indoceltites, C. Diener 1919 [Thanamitidae]
- Indocephalites [Macrocephalitidae]
- Indoceras [Problematica]
- Indoceras, Noetling 1897 [Sphenodiscidae]
- Indocerithium, Chavan 1952 [Cerithiidae]
- Indocrinus, Wanner 1916 [Cladida]
- Indoculana [Nuculida]
- Indogrammatodon, Cox 1937 [Parallelodontidae]
- Indojuvavites, C. Diener 1916 [Juvavitidae]
- Indomya [Pholadomyida]
- Indonautilus, Mojsisovics 1902 [Paranautilidae]
- Indonectes [Pterioida]
- Indonesites, O. Welter 1914 [Tropitidae]
- Indopecten [Pectinidae]
- Indophyllia, Gerth 1921 [Mussidae]
- Indoplacuna, Vredenburg 1924 [Anomiidae]
- Indorhynchia [Cyclothyrididae]
- Indosmilia, Gerth 1933 [Faviidae]
- Indosphinctes [Cephalopoda]
- Indospirifer [Echinospiriferidae]
- Indota, Opik 1968 [Archaeocopida]
- Indotrigonia [Trigoniida]
- Indovoluta [Neogastropoda]
- Inessocyathellus [Ajacicyathida]
- Inessocyathus [Ajacicyathida]
- Infexiostella [Demospongea]
- Inflatia [Productidae]
- Inflaticornus [Orthothecida]
- Inflatobolivinella [Foraminifera]
- Inflatomonotis, J.A. Grant-Mackie 1978 [Monotidae]
- Infraclypeus [Desorellidae]
- Infracoronia [Neogastropoda]
- Infundibulipora [Cyclostomata]
- Infundibulops [Archaeogastropoda]
- Ingentilotus, Laubenfels 1955 [Plinthosellidae]
- Inglefieldia, Poulson 1927 [Alokistocaridae]
- Inglisella, Finlay 1924 [Cancellariidae]
- Ingolitotheca [Hyolithida]
- Iniathyris [Athyrididae]
- Inichthys, Kazantseva-Selezneva 1979 [Palaeonisciformes]
- Iniella [Podocopida]
- Iniopterygia, order, Zangerl and Case 1973 [Chondrichthyes]
- Iniopterygiformes, order (Zangerl and Case 1973) [Chondrichthyes]
- Iniopteryx [Iniopterygidae]
- Iniospheniscus, Opik 1979 [Diplagnostidae]
- Iniotoma, Opik 1967 [Asaphiscidae]
- Inioxyle [Iniopterygia]
- Iniproductus [Productellidae]
- Inisylthere [Palaeocopida]
- Innaechia [Innaechiidae]
- Innapora, Leleshus 1974 [Proporidae]
- Innitagnostus, Opik 1967 [Agnostidae]
- Innuitella [Leiorhynchidae]
- Inobolia [Pharetronida]
- Inocaulis [Hydroida]
- Inocentrus [Beryciformes]
- Inoceramus, Sowerby 1814 [Inoceramidae]
- Inoceramya [Pterioida]
- Inodia, Moret 1925 [Demospongea]
- Inoperna, Conrad 1873 [Mytilidae]
- Inopinatarcula [Inopinatarculidae]
- Inordinatosphaera [Foraminifera]
- Inouyella, Resser and Endo 1935 [Ptychopariida]
- Inouyia, Walcott 1911 [Inouyiidae]
- Inouyina, Poletayeva 1936 [Namanoiidae]
- Inouyops, Resser 1942 [Lorenzellidae]
- Inoyellaspis, Ivshin 1952 [Ptychopariida]
- Inquisitor, Hedley 1918 [Turridae]
- Insculptarenula, Loeblich and Tappan 1985 [Trochamminidae]
- Insignia [Cryptostomata]
- Insignicornus [Hyolithida]
- Insignitisinurostrum [Platyterorhynchidae]
- Insolentia, Finlay 1926 [Turridae]
- Insolentitheca [Foraminifera]
- Insolicorypha [Annelida]
- Insoliphyllum, Ermakova 1957 [Anthozoa]
- Institella, Cooper 1942 [Aulostegidae]
- Institifera [Productellidae]
- Institina [Aulostegidae]
- Integricardium, Rollier 1912 [Cardiidae]
- Intejoceras, Balashov 1960 [Intejoceratidae]
- Intejocerida, order, Balashov 1960 [Cephalopoda]
- Interalia, Opik 1967 [Ptychopariida]
- Intermediacrinus, Sutton and Winkler 1940 [Cladida]
- Interproetus, Snajdr 1977 [Tropidocoryphidae]
- Intersmilia, Eliasova 1974 [Intersmiliidae]
- Intexodictyon, Yavorsky 1963 [Atelodictyidae]
- Intextum, Laubenfels 1955 [Craticulariidae]
- Intoceras, Kusina 1971 [Intoceratidae]
- Intodesma [Pterioida]
- Intornites, Asserto 1966 [Longobarditidae]
- Inversiula [Inversiulidae]
- Inversoceras, Hedström 1917 [Trimeroceratidae]
- Invertina [Atrypidae]
- Invertrypa [Atrypidae]
- Involuta [Volutidae]
- Involutaria [Ichthyolariidae]
- Involuticeras [Cephalopoda]
- Involutina [Involutinidae]
- Involvina [Foraminifera]
- Inyocrinus [Crinoidea]
- Inzeroceras, Ruzhencev 1974 [Schistoceratidae]
- Iocrinus, Hall 1866 [Crinoidea]
- Iohomia, Hu 1971 [Ptychopariida]
- Iolaea, Adams 1867 [Pyramidellidae]
- Iolgia, Kraevsky 1965 [Redlichiida]
- Ionicythere [Podocopida]
- Ionoscopus, Costa 1853 [Amiiformes]
- Iophon [Poecilosclerida]
- Ioscion, Jordan 1921 [Perciformes]
- Iothia, Forbes 1849 [Archaeogastropoda]
- Iotrigonia [Trigoniida]
- Iouea [Demospongea]
- Iowacystis [Soluta]
- Iowanella [Foraminifera]
- Iowaphyllum, Stumm 1949 [Endophyllidae]
- Iowarhynchus [Paranorellidae]
- Iowaspongia [Reticulosa]
- Iowatrypa, Copper 1973 [Atrypidae]
- Iowoceras [Oncocerida]
- Ipherron [Plectorhynchellidae]
- Iphiana [Heterostrophia]
- Iphiculus, Adams and White 1848 [Iphiculidae]
- Iphigenia [Cardiida]
- Ipmorella [Cryptostomata]
- Ipsiphyllum [Anthozoa]
- Iquitosia [Serpulimorpha]
- Iranaspis, King 1937 [Corynexochida]
- Iranella, Hupe 1953 [Dikelocephalidae]
- Iraniaster [Somaliasteridae]
- Iranoblastus [Spiraculata]
- Iranoceras, Walliser 1966 [Sporadoceratidae]
- Iranognathus [Conodontophorida]
- Iranoleesia, King 1955 [Proasaphiscidae]
- Iranophyllum, Douglas 1936 [Waagenophyllidae]
- Iraqia [Foraminifera]
- Iraqicythereis [Podocopida]
- Iravadia, Blanford 1867 [Iravadiidae]
- Irboskites [Araksalosiidae]
- Iredalina, Finlay 1926 [Volutidae]
- Iredalula, Finlay 1926 [Buccinidae]
- Irenechinus [Temnopleuridae]
- Irenita [Foraminifera]
- Irenothyris [Zeilleriidae]
- Irgislella [Leiorhynchidae]
- Irgitkhemia, Chernysheva 1977 [Redlichiida]
- Irhirea [Plectorthidae]
- Irianoceras [Ellesmerocerida]
- Iridistrophia [Chilidiopsidae]
- Irinaecyathus [Ajacicyathida]
- Irinia, Egorova and Savitsky 1968 [Ptychopariida]
- Irinites [Oncocerida]
- Irinoceras, Ruzhencev 1947 [Prionoceratidae]
- Irregulares, class, Vologdin 1937 [Archaeocyatha]
- Irregulariaspis [Pteraspidomorphes]
- Irregularina [Parathuramminidae]
- Irridinites [Medusae]
- Irus, Schmidt 1818 [Veneridae]
- Irusella, Hertlein and Grant 1972 [Veneridae]
- Irvingella, Ulrich and Resser 1924 [Elviniidae]
- Irvingelloides, Kobayashi 1935 [Ptychopariida]
- Isabelinia, Rabano 1989 [Asaphidae]
- Isacia, Jordan and Fesler 1894 [Perciformes]
- Isanda, H. Adams and A. A 1854 [Trochidae]
- Isarcicella [Conodontophorida]
- Isaster [Toxasteridae]
- Isastrocoenia, Gregory 1900 [Conophyllidae]
- Isbergia, Warburg 1925 [Rorringtoniidae]
- Ischadia [Demospongea]
- Ischadium, Jukes-Browne 1905 [Mytilidae]
- Ischnacanthida, order, Berg 1940 [Acanthodii]
- Ischnacanthus, Powrie 1864 [Ischnacanthiformes]
- Ischnochiton, Gray 1847 [Ischnochitonidae]
- Ischyodus, Egerton 1843 [Callorhynchidae]
- Ischyrhiza, J. Leidy 1856 [Sclerorhynchidae]
- Ischyrodonta, Ulrich 1890 [Allodesmatidae]
- Ischyrotoma, Raymond 1925 [Dimeropygidae]
- Isculites, E. v. Mojsisovics 1886 [Isculitidae]
- Isculitoides, L. F. Spath 1930 [Paragoceratidae]
- Isechinus, Lambert 1903 [Echinidae]
- Iselica [Pyramidellidae]
- Ishigaconus, Kozur and Mostler 1989 [Follicucullidae]
- Ishigaum, De Wever and Caridroit 1984 [Cauletellidae]
- Ishimia, Nikitin 1974 [Leptellinidae]
- Ishmiella [Palaeocopida]
- Ishnula [Neogastropoda]
- Ishpella, Petrunina 1990 [Trilobita]
- Isispongia [Demospongea]
- Isistius, Gill 1864 [Squalidae]
- Isiticyathus [Ajacicyathida]
- Isititheca [Orthothecida]
- Isjuminelina [Rhynchonellida]
- Isjuminella, Makridin 1955 [Tetrarhynchiidae]
- Islandiella [Islandiellidae]
- Islipia [Archaeogastropoda]
- Ismailia [Foraminifera]
- Ismidaster [Holasteridae]
- Ismidites [Khvalynitidae]
- Isoarca, Muenster 1842 [Isoarcidae]
- Isobuntonia [Podocopida]
- Isobythocypris [Bairdiidae]
- Isocatillocrinus, Wanner 1937 [Crinoidea]
- Isochilina, Jones 1858 [Isochilinidae]
- Isocolus, Angelin 1854 [Isocolidae]
- Isocrania, Jaekel 1902 [Craniidae]
- Isocrassina [Cardiida]
- Isocrinida, order, Sieverts-Doreck 1952 [Cladida]
- Isocrinus, Meyer in Agassiz 1836 [Isocrinidae]
- Isocyprina, Röder 1882 [Arcticidae]
- Isocythereis [Podocopida]
- Isodomella [Neomiodontidae]
- Isognomon, Lightfoot 1786 [Malleidae]
- Isogomphodon, Gill 1862 [Carcharhinidae]
- Isogramma [Isogrammidae]
- Isograptus, Moberg 1892 [Graptoloidea]
- Isohabrocythere [Podocopida]
- Isohomoceras, Ruzhencev and Bogoslovskaya 1971 [Homoceratidae]
- Isomicraster [Toxasteridae]
- Isopetalum [Hemiasteridae]
- Isophragma, Cooper 1956 [Plectambonitidae]
- Isophyllia, Milne-Edwards and Haime 1851 [Mussidae]
- Isopneustes [Micrasteridae]
- Isopoda, order, Latreille 1817 [Malacostraca]
- Isopodites [Isopoda]
- Isopoma [Aseptorhynchiidae]
- Isopristes [Cardiida]
- Isoprusia, Burton 1966 [Odontopleuridae]
- Isopsetta, Jordan and Gilbert 1882 [Pleuronectiformes]
- Isoraphinia, Zittel 1878 [Carterellidae]
- Isorophida, order [Edrioasteroidea]
- Isorophus, Foerste 1916 [Agelacrinitidae]
- Isorophusella, Bassler 1935 [Agelacrinitidae]
- Isorthis, Kozlowski 1929 [Dalmanellidae]
- Isospinatrypa [Atrypidae]
- Isotancredia [Cardiida]
- Isoteloides, Raymond 1910 [Asaphidae]
- Isotelus, Dekay 1824 [Asaphidae]
- Isotomocrinus, Ulrich 1925 [Heterocrinidae]
- Isotrypa [Fenestellidae]
- Isoxys, Walcott 1890 [Arthropoda]
- Isphairamella [Cystoporata]
- Ispharaella [Palaeocopida]
- Isphyllastrea [Scleractinia]
- Issafenia, Hupe 1960 [Trilobita]
- Issafeniella, Geyer 1990 [Trilobita]
- Issedonia, Popov 1980 [Torynelasmatidae]
- Isselia, Semper 1874 [Pleurobranchidae]
- Isselicrinus, Roverto 1914 [Isselicrinidae]
- Issolites, Yanet 1977 [Favositidae]
- Isterites [Cephalopoda]
- Istiophorus, Lacépède 1802 [Istiophoridae]
- Istorinus, Knüpfer 1967 [Conodontophorida]
- Istreites, Simionescu 1913 [Ptychitidae]
- Istriloculina [Hauerinidae]
- Isumithyris [Dallinidae]
- Isurolamna, Cappetta 1992 [Lamniformes]
- Isyrakopeltis, Rosov and Dubatolova 1985 [Asaphida]
- Itagnostus, Opik 1979 [Agnostida]
- Italoptygmatis [Heterostrophia]
- Itararella [Amphidiscosa]
- Iteacrinus, Goldring 1923 [Rutkowskicrinidae]
- Ithycephalus, Resser 1938 [Kingstoniidae]
- Ithyektyphus, Shaw 1956 [Ptychopariida]
- Itia [Neogastropoda]
- Itieria [Heterostrophia]
- Itomelania, Suzuki 1943 [Neotaenioglossa]
- Itruvia [Heterostrophia]
- Iuliusina [Foraminifera]
- Ivanopleura, Snajdr 1984 [Odontopleuridae]
- Ivanothyris [Delthyrididae]
- Ivanovaecrinus, Arendt 1983 [Monobathrida]
- Ivanovella [Foraminifera]
- Ivanovia, Dobrolyubova 1935 [Petalaxidae]
- Ivanoviella, Makridin 1955 [Rhynchonellidae]
- Ivanovites [Hyolithelminthes]
- Ivara, Dall and Bartsch 1913 [Pyramidellidae]
- Ivaria [Palaeocopida]
- Ivdelephyllum, Spasskiy 1971 [Disphyllidae]
- Ivdelina [Foraminifera]
- Ivdelinia, Andronov 1961 [Gypidulidae]
- Iveria, Shergold 1980 [Trilobita]
- Ivia, Schallreuter 1984 [Leperditicopida]
- Ividella, Dall and Bartsch 1909 [Pyramidellidae]
- Ivshinaspis, Petrunina 1973 [Remopleurididae]
- Ivshinella, Koneva 1979 [Obolellidae]
- Iwaispirifer [Strophopleuridae]
- Iwayaspis, Kobayashi 1960 [Trilobita]
- Ixa, Leach 1816 [Leucosiidae]
- Ixoides [Decapoda]
- Iyouella, Geyer and Palmer 1995 [Holmiidae]
- Izumia [Arcticidae]
- Izumicardia, Ichikawa 1963 [Carditidae]
- Jaanussonia [Palaeocopida]
- Jaccardiella [Heterostrophia]
- Jacquhermania, Cappetta 1982 [Gymnuridae]
- Jacquiertia [Phymosomatidae]
- Jaculella [Hippocrepinidae]
- Jaculina [Cheilostomata]
- Jacuticornus [Hyolithida]
- Jacutolitus [Hyolithida]
- Jadammina [Foraminifera]
- Jaekelicrinus, Yakovlev 1949 [Crinoidea]
- Jaekelocystis, Schuchert 1903 [Rhombifera]
- Jaekelometra [Comatulida]
- Jaekelopterus [Eurypterida]
- Jaekelotodus [Jaekelotodontidae]
- Jagatiella [Palaeocopida]
- Jagolucina, Chavan 1937 [Lucinidae]
- Jagorina, Jaeckel 1821 [Rhenanida]
- Jahnocrinus, Jeakel 1918 [Cladida]
- Jaisalmeria [Terebratulida]
- Jakutella [Sentosiidae]
- Jakutobolbina [Palaeocopida]
- Jakutocarinus [Ajacicyathida]
- Jakutostrophia [Amphistrophiidae]
- Jakutus, Lermontova 1951 [Jakutidae]
- Jamesella, Walcott 1905 [Protorthidae]
- Jamischjewskya [Ostracoda]
- Jamoytius [Anaspida]
- Janassa [Janassidae]
- Janenschites [Cephalopoda]
- Jangudacyathus [Ajacicyathida]
- Jangudaspis, Ogienko 1956 [Ptychopariidae]
- Jangziceras [Orthocerida]
- Janiopsis, Rovereto 1899 [Buccinidae]
- Janischewskina [Foraminifera]
- Janita [Serpulimorpha]
- Janius, Havlicek 1957 [Cyrtiidae]
- Janograptus [Graptoloidea]
- Janopecten [Pectinidae]
- Janospira [Yochelcionellidae]
- Janschinella [Myoida]
- Janthina, Ršding 1798 [Janthinidae]
- Janupecten, Marwick 1928 [Pectinidae]
- Janusella [Metacopida]
- Janxilithus [Ptychopariida]
- Japanithyris, Thomson 1927 [Dallinidae]
- Japelion [Neogastropoda]
- Japhanicyathus [Ajacicyathida]
- Japonisaturnalis, Kozur and Mostler 1972 [Parasaturnalidae]
- Japonites, E. Mojsisovics 1893 [Gymnitidae]
- Japonoconger, Asano 1958 [Anguilliformes]
- Jaregoceras [Discosorida]
- Jarovathyris [Athyrididae]
- Jarvisella [Foraminifera]
- Jascottella [Hemisphaeramminidae]
- Jasus, Parker 1883 [Palinuridae]
- Jatella [Podocopida]
- Jauberticeras, Jacob 1907 [Gaudryceratidae]
- Javanella [Podocopida]
- Javatius [Palaeocopida]
- Jaworskiella, Leanza 1942 [Laevitrigoniidae]
- Jaworskiella (Quadratojaworskiella), Reyes and Perez 1980 [Laevitrigoniidae]
- Jaxea, Nardo 1847 [Laomediidae]
- Jaycea [Tommotiida]
- Jeanlouisella [Palaeocopida]
- Jeannetia [Stomechinidae]
- Jeanneticeras [Cephalopoda]
- Jebileticoscinus [Ajacicyathida]
- Jeffersonia, Poulson 1927 [Bathyuridae]
- Jeffreysina, Thiele 1925 [Rissoellidae]
- Jefina [Podocopida]
- Jegorovaia, Lu 1964 [Alsataspididae]
- Jeletzkiella [Pterioida]
- Jeletzkytes, Riccardi 1983 [Scaphitidae]
- Jeletzkyteuthis, Doyle 1990 [Teuthida]
- Jellinekites, C. Diener 1906 [Parathisbitidae]
- Jenkinochitina [Rhizopodea]
- Jenkinsonia, Robison 1971 [Alokistocaridae]
- Jenningsina [Metacopida]
- Jercia (Havlicek and Mergl 1982) [Chrustenoporidae]
- Jerea, Lamouroux 1821 [Siphoniidae]
- Jereica, Zittel 1878 [Jereicidae]
- Jereminella [Serpulimorpha]
- Jereomorpha [Demospongea]
- Jereopsis, Pomel 1872 [Jereicidae]
- Jerjesia, Alencáster 1986 [Polyconitidae]
- Jeronia [Holasteridae]
- Jesonia, Gray [Carditidae]
- Jessievillia [Ptychopariida]
- Jevinellina [Eoorthidae]
- Jiagouceras [Ellesmerocerida]
- Jianfengia [Arthropoda]
- Jianghania [Anthaspidellidae]
- Jiangjunshania, Qiu 1983 [Ptychopariida]
- Jiangshanodus [Problematica]
- Jiangshanolites, Lin and Chow [Anthozoa]
- Jiangsuaspis, Lin 1983 [Ptychopariida]
- Jiangsucephalus, Qiu 1983 [Ptychopariida]
- Jiangxilepus [Antiarcha]
- Jielingia [Foliomenidae]
- Jiguliconcha [Productellidae]
- Jiia, Zhou and Zhang 1978 [Remopleurididae]
- Jilinia [Articulata]
- Jilinospirifer [Theodossiidae]
- Jillua [Hydrozoa]
- Jima [Lychniscosa]
- Jimboiceras [Desmoceratidae]
- Jimenites [Cephalopoda]
- Jingguella [Podocopida]
- Jinghediscus, Xiang and Zhang 1985 [Agnostida]
- Jingyangia, Lu and Chang 1974 [Redlichiida]
- Jinonicella [Ribeirioida]
- Jintingophyllum, Yü 1977 [Geyerophyllidae]
- Jipaolasma [Anthozoa]
- Jiucunella [Arthropoda]
- Jivinella [Eoorthidae]
- Jixinglingella [Ostracoda]
- Joachimilites [Hyolithida]
- Joachimoceras, Barskov 1960 [Geisonoceratidae]
- Joamgsjamotes [Graptoloidea]
- Joanellia, Schram 1979 [Aeschronectida]
- Joannites, E. v. Mojsisovics 1879 [Joannitidae]
- Jogjacartanus, Martin 1931 [Strombidae]
- Johannaia [Neogastropoda]
- Johnsoniatrypa [Lissatrypidae]
- Johnstrupia, Ravn 1933 [Triviidae]
- Joldagiroceras [Orthocerida]
- Joleaudichthys, Chabanaud 1937 [Pleuronectiformes]
- Jolietoceras, Foerste 1925 [Uranoceratidae]
- Jolonica [Frenulinidae]
- Jolonica (Kamoica) (Hatai 1936) [Frenulinidae]
- Jolvia, Sapel'nikov 1960 [Pentameridae]
- Jonesea, Cocks and Rong 1989 [Aegiromenidae]
- Jonesella [Palaeocopida]
- Jonesia [Pseudocytheridae]
- Jonesina [Palaeocopida]
- Jonesites, Coryell 1930 [Bolliidae]
- Jonesoceras, Barskov 1960 [Geisonoceratidae]
- Jonotus, Meyer 1848 [Trilobita]
- Jordanites [Hollinellidae]
- Josepha [Buccinidae]
- Josephella, Caullery and Mesnil 1896 [Serpulidae]
- Josephulus, Warburg 1925 [Phacopida]
- Jouaniceras, Basse 1939 [Nostoceratidae]
- Jouannetia, Des Moulins 1828 [Pholadidae]
- Joufia, Boehm 1897 [Radiolitidae]
- Jousseaumea, Sacco 1894 [Cypraeidae]
- Jovellania, Bayle 1879 [Jovellaniidae]
- Joviatrypa, Copper 1995 [Atrypidae]
- Jovites, E. v. Mojsisovics 1893 [Tropitidae]
- Juaboceras [Endocerida]
- Juanognathus [Conodontophorida]
- Jubileia, Kobayashi 1938 [Trilobita]
- Judahella [Cytherissinellidae]
- Judaiella, Lermontova 1951 [Trilobita]
- Juddiceras, Spath 1924 [Protancyloceratidae]
- Judeichthys, Gayet 1985 [Gonorhynchidae]
- Judeoberyx, Gayet 1980 [Beryciformes]
- Judicarites, E. v. Mojsisovics 1896 [Danubitidae]
- Judomia, Lermontova 1943 [Judomiidae]
- Judomiella, Lazarenko 1962 [Olenellida]
- Juglandocrinus, von Koenen 1886 [Rhombifera]
- Jugosocythereis [Podocopida]
- Jujubinus, Monterosato 1884 [Trochidae]
- Jujuyaspis, Kobayashi 1936 [Olenidae]
- Julia, Gould 1862 [Juliidae]
- Juliacorbula, Olsson 1953 [Corbulidae]
- Jumala [Neogastropoda]
- Jumudontus [Conodontophorida]
- Junctusina [Palaeocopida]
- Jungersenichthys, Blot 1981 [Aulostomidae]
- Junggaroblastus [Fissiculata]
- Junghuhnia [Neogastropoda]
- Junjagiana [Modiomorphida]
- Junocrinus, Prokop 1977 [Crinoidea]
- Jupiteria, Bellardi 1875 [Nuculanidae]
- Juralina [Postepithyrididae]
- Juramegalodus [Hippuritida]
- Juranomia [Anomiidae]
- Juraphyllites [Juraphyllitidae]
- Jurassicardium, Cossmann 1906 [Cardiidae]
- Jurassicorbula [Myoida]
- Jurassiphorus [Gastropoda]
- Jurella [Foraminifera]
- Juresania, Fredericks 1928 [Echinoconchidae]
- Juresanites, Maximova 1940 [Metalegoceratidae]
- Juriietella, Jegorova 1981 [Trilobita]
- Juvavella [Juvavellidae]
- Juvavellina [Juvavellidae]
- Juvavionautilus, Mojsisovics 1902 [Syringonautilidae]
- Juvavites, E. v. Mojsisovics 1879 [Juvavitidae]
- Juvenix [Podocopida]
- Jyxilla [Medusae]
- Kaawatina [Archaeogastropoda]
- Kabakovitchiella, Weyer 1972 [Laccophyllidae]
- Kabatarina [Copepoda]
- Kablikia [Arthropoda]
- Kabukiia, Zhang 1987 [Ptychopariida]
- Kabyaipecten [Pterioida]
- Kabylites, Durand Delga 1954 [Bochianitidae]
- Kachpurites, Spath 1924 [Cephalopoda]
- Kadaroceras [Discosorida]
- Kadiskoblastus [Spiraculata]
- Kadraliproductus [Productellidae]
- Kadyella, Pokrovskaya 1959 [Ellipsocephalidae]
- Kaesleria [Podocopida]
- Kaeveria [Ataxophragmiidae]
- Kahlerina, Kochansky-Devide 1955 [Verbeekinidae]
- Kailia, Chang 1974 [Encrinuridae]
- Kailiceras [Cephalopoda]
- Kailuanoceras, Obata 1940 [Cephalopoda]
- Kaimenella, Märss 1988 [Palaeoscolecidae]
- Kainella, Walcott 1925 [Remopleurididae]
- Kainops, Ramskold and Werdelin 1991 [Phacopidae]
- Kaiparapelta [Archaeogastropoda]
- Kaipingoceras, Shimizu and Obata 1937 [Cephalopoda]
- Kaitangata, Finlay and Marwick 1937 [Mathildidae]
- Kaitoa, Marwick 1931 [Cephalaspida]
- Kajnaria [Leptellinidae]
- Kalamopsis, De Folin 1883 [Hormosinidae]
- Kalayoldia, U.S. Grant and Gale 1931 [Yoldiidae]
- Kalevipora [Trepostomida]
- Kalimnasphaera [Spumellaria]
- Kalitvella [Martiniidae]
- Kalitvella [Spiriferida]
- Kaljolasma, Weyer 1972 [Streptelasmatidae]
- Kallholnoceras [Oncocerida]
- Kallidecthes, Schram 1969 [Aeschronectida]
- Kallimorphocrinus, Weller 1930 [Allagecrinidae]
- Kalloclymenia, Wedekind 1914 [Gonioclymeniidae]
- Kalloprion [Eunicemorpha]
- Kallostracon [Pteraspididae]
- Kalochitina [Rhizopodea]
- Kalosha [Spiroloculinidae]
- Kalpidocrinus, Goldring 1954 [Cladida]
- Kalpinella, Hinde 1884 [Siphoniidae]
- Kalpinograptus [Graptoloidea]
- Kaltatocyathus [Ajacicyathida]
- Kalugia [Palaeocopida]
- Kaluginella, Kuzmicheva 1980 [Helioporacea]
- Kalyptovalva [Podocopida]
- Kamajcythereis [Podocopida]
- Kameschkoviella, Repina 1959 [Ptychopariida]
- Kamlacus, Petrunina 1984 [Trilobita]
- Kammerkaroceras [Psiloceratidae]
- Kamoica, Hatai 1936 [Frenulinidae]
- Kamptoclymenia, Schindewolf 1937 [Parawocklumeriidae]
- Kamptokephalites [Macrocephalitidae]
- Kamurana [Milioliporidae]
- Kanabinocrinus, Ausich 1986 [Cladida]
- Kanakaia [Keramosphaeridae]
- Kangapaya [Archaeogastropoda]
- Kangarina [Podocopida]
- Kangvarella [Foraminifera]
- Kangxianospira [Neotaenioglossa]
- Kaninia, Walcott and Resser 1928 [Asaphiscidae]
- Kaniniella, Kobayashi 1938 [Asaphida]
- Kaninospirifer [Trigonotretidae]
- Kankopora [Cheilostomata]
- Kansacrinus, Pabian and Strimple 1985 [Cladida]
- Kansanella [Fusulinoidea]
- Kansasteuthis, Miller and Walker 1968 [Paleololiginidae]
- Kansius, Hussakof 1929 [Beryciformes]
- Kansuella [Monticuliferidae]
- Kantollum, Cheng 1986 [Popofskyellidae]
- Kaolishania, Sun 1924 [Kaolishaniidae]
- Kaolishaniella, Sun 1935 [Kaolishaniidae]
- Kaotaia, Lu 1962 [Ptychopariidae]
- Kapal, Martin 1930 [Octopoda]
- Kaparachlamys [Pterioida]
- Kaplex [Stringocephalidae]
- Kaplicona [Carinatinidae]
- Kapua, Marwick 1931 [Epitoniidae]
- Karaburunia [Ophthalmidiidae]
- Karaclymenia, Bogoslovsky 1983 [Carinoclymeniidae]
- Karadagella, Babanova 1965 [Muirwoodellidae]
- Karadzharoceras [Discosorida]
- Karagandoceras, Librovitch 1940 [Karagandoceratidae]
- Karagandoides, Ivshin 1962 [Ptychopariida]
- Karagemia, Dzyubo 1960 [Cyrtophyllidae]
- Karaisella [Foraminifera]
- Karakulina [Camerellidae]
- Karamaiceras [Cephalopoda]
- Karamaites [Cephalopoda]
- Karangatites, Y. N. Popov 1968 [Meekoceratidae]
- Karapadites, Collignon 1954 [Kossmaticeratidae]
- Karaschiceras [Cephalopoda]
- Karataspis, Ergaliev 1983 [Eulomidae]
- Karathele, Koneva 1986 [Botsfordiidae]
- Karbous [Glassiidae]
- Karelosteus [Pteraspidomorphes]
- Karinadomella [Pachydomellidae]
- Karinutatia [Palaeocopida]
- Karlaster [Monophorasteridae]
- Karlicium [Dalmanellidae]
- Karlsteinella [Palaeocopida]
- Karlwaageites, Cooper 1994 [Scaphitidae]
- Karnotreta [Siphonotretidae]
- Karoceras, Roussanoff 1909 [Karoceratidae]
- Karpatiella [Zeilleriidae]
- Karpinskia [Karpinskiidae]
- Karreria [Foraminifera]
- Karreriella, Cushman 1933 [Valvulinidae]
- Karrerotextularia [Foraminifera]
- Karsteneis [Podocopida]
- Karsteniceras, Royo-Gomez 1945 [Ancyloceratidae]
- Kasachia [Nuculida]
- Kasachstanodiscus [Foraminifera]
- Kasakhstanella [Cystoporata]
- Kasakhstania [Spiriferidae]
- Kasatchaspis, Ivshin 1962 [Ptychopariida]
- Kaschkadakia [Mollusca]
- Kasetia [Linoproductidae]
- Kashiwara, Sashida and Tonishi 1985 [Spumellaria]
- Kashmirites, C. Diener 1913 [Kashmiritidae]
- Kasovobolbina [Palaeocopida]
- Kassabiana [Foraminifera]
- Kassina [Nassellaria]
- Kassinella, Borissiak 1956 [Hesperomenidae]
- Kassinina [Podocopida]
- Kassinius, Ivshin 1952 [Corynexochida]
- Kasyricyathus [Ajacicyathida]
- Katacanites, Kullmann 1963 [Prolecanitidae]
- Katageioceras [Discosorida]
- Katarocrinus [Crinoidea]
- Katatona [Palaeocopida]
- Katchathyris [Aulacothyropsidae]
- Katelysia, Römer 1857 [Veneridae]
- Katharina, Gray 1847 [Mopaliidae]
- Kathemacanthus, Gagnier and Wilson 1996 [Climatiiformes]
- Kathina [Foraminifera]
- Kathleenella, Ludvigsen 1982 [Ptychaspididae]
- Kathpalmeria, Ross 1965 [Archaeobalanidae]
- Kathrynia, Westrop 1986 [Harpetidae]
- Katoporodus, Turner and Peel 1986 [Katoporididae]
- Katosira, Koken 1892 [Settsassiidae]
- Katranophyllum, Kropacheva 1972 [Aulophyllidae]
- Katroliceras, Spath [Ataxioceratidae]
- Katrolites [Cephalopoda]
- Katroma, Pessagno and Poisson 1981 [Syringocapsidae]
- Katunia [Leiorhynchidae]
- Katunioides [Mollusca]
- Katzeria, Sliskovic 1966 [Radiolitidae]
- Kaufmannella [Ptychopariida]
- Kaunhowenia, Abdel-Gawad 1986 [Aporrhaidae]
- Kaurnella, Ludbrook 1941 [Archaeogastropoda]
- Kavesia [Productidae]
- Kawalepsis [Thelodontiformes]
- Kawasakiceras, Kobayashi 1934 [Sactorthoceratidae]
- Kaweka [Neogastropoda]
- Kawina, Barton 1916 [Cheiruridae]
- Kayatia [Palaeocopida]
- Kayina [Palaeocopida]
- Kayoceras, Foerste 1934 [Lowoceratidae]
- Kayseraspis, Harrington 1938 [Asaphidae]
- Kayserella [Kayserellidae]
- Kayseria [Kayseriidae]
- Kayserops, Delo 1935 [Acastidae]
- Kayutoceras, Ruzhencev and Ganelin 1971 [Orulganitidae]
- Kazachiphyllum, Bykova 1966 [Aulophyllidae]
- Kazachstania, Maksimova 1972 [Dalmanitidae]
- Kazachstanoblastus, Yu. A. Arendt et al. 1968 [Fissiculata]
- Kazakhoceras, Ruzhencev 1947 [Berkhoceratidae]
- Kazakhoclymenia [Clymeniida]
- Kazakhstania, Librovitch 1940 [Gattendorfiidae]
- Kazakhstanicyathida, order [Irregulares]
- Kazakhstanites, A. A. Shevyrev 1968 [Sibiritidae]
- Kazakhstanotubulus [Problematica]
- Kazania [Demospongea]
- Kazarchimedes [Fenestrata]
- Kazelia, Walcott and Resser 1928 [Asaphida]
- Kazelina [Ptychopariida]
- Kazellina, Sivov 1955 [Trilobita]
- Kechenotiske [Hyperamminoididae]
- Kechikacyathus [Archaeocyathida]
- Kedrovothyris [Zeilleriidae]
- Keeleaspis, Fritz 1972 [Trilobita]
- Keenaea, Habe 1951 [Cardiidae]
- Keenocardium [Cardiidae]
- Keepingia, Nuttal and Cooper 1973 [Nassariidae]
- Kefiella [Podocopida]
- Kegeliella, Lutke 1990 [Proetida]
- Kegelites [Amphissitidae]
- Keichousaurus, Young 1958 [Pachypleuridae]
- Keijella [Podocopida]
- Keilostoma, Deshayes 1848 [Diastomatidae]
- Keimanelasma [Anthozoa]
- Keithia, Raymond 1924 [Ptychaspididae]
- Keithiella, Rasseti 1944 [Ptychaspididae]
- Kelaeno, Munster 1842 [Teuthida]
- Kelamelia [Productidae]
- Kelanella [Mitrosagophora]
- Kelestoma [Cheilostomata]
- Kellawaysites [Reineckeiidae]
- Kellericyathus [Ajacicyathida]
- Kelletia, Fischer 1884 [Buccinidae]
- Kellettina [Kellettinidae]
- Kellia, Turton 1822 [Lasaeidae]
- Kellibrookia [Hoplostraca]
- Kelliella, Sars 1865 [Kelliellidae]
- Kellnerites, G. v. Arthaber 1912 [Ceratitidae]
- Kelteroceras, S. P. Ermakova 1975 [Xenodiscidae]
- Kelusia [Ambocoeliidae]
- Kemeroviana [Podocopida]
- Kendallina, Berg 1953 [Parabolinoididae]
- Kendrickichthys, Dennis and Miles 1980 [Arthrodira]
- Kendzhilgithyris [Terebratulida]
- Kenelasma [Anthozoa]
- Kenella [Cheilostomata]
- Kenophyllum, Dybowski 1873 [Streptelasmatidae]
- Kenseyoceras, Selwood 1960 [Prionoceratidae]
- Kentlandoceras, Foerste 1932 [Oncoceratidae]
- Kentronetes [Strophochonetidae]
- Kentrosia [Lychniscosa]
- Kentuckia, Rayner 1951 [Palaeonisciformes]
- Keokukia [Productidae]
- Kephrenia [Pliolampadidae]
- Kepingaspis, Chang 1965 [Redlichiida]
- Kepingophyllum [Kepingophyllidae]
- Kepinospira [Mollusca]
- Kepisis, Hu 1971 [Ptychopariida]
- Kepplerites, Neumayr and Uhlig 1892 [Kosmoceratidae]
- Keraiaceras [Ellesmerocerida]
- Keramosphaerina [Keramosphaeridae]
- Keration, Broili 1907 [Tubinidae]
- Keratothyris [Zeilleriidae]
- Kerberites [Cephalopoda]
- Kerbinella, Jegorova 1984 [Trilobita]
- Kerfornecaris [Archaeostraca]
- Kerforneidictyum, Lafuste and Plusquellec 1976 [Micheliniidae]
- Kericserella [Norellidae]
- Keriocoelia [Tabulospongida]
- Keriogastrospongia, Wu 1989 [Pelicaspongiidae]
- Kerionammina [Diffusilinidae]
- Keriophylloides, Soshkina 1951 [Phillipsastreidae]
- Kermadysmea [Cardiida]
- Kerpina [Atrypidae]
- Kertaster [Spatangoida]
- Keslingiella [Podocopida]
- Kestocenbra (Vermeij 1998) [Neogastropoda]
- Kestocenebra, Vermeij 1998 [Muricidae]
- Ketemecornus [Hyolithida]
- Ketophylloides, Lavrusevich 1971 [Ketophyllidae]
- Ketophyllum, Wedekind 1927 [Chonophyllidae]
- Kettnerammina [Foraminifera]
- Kettneraspis, Prantl and Pribyl 1949 [Odontopleuridae]
- Kettnerites [Eunicemorpha]
- Ketyna, Rozova 1963 [Eulomidae]
- Kewia, Nisiyama 1935 [Echinarachniidae]
- Keyserlingia, Pander 1861 [Ceratretidae]
- Keyserlingites, A. Hyatt 1900 [Sibiritidae]
- Keyserlingophyllum, Shtukenberg 1895 [Uraliniidae]
- Khalfinaea [Calcarea]
- Khalfinella, Elkin 1964 [Proetida]
- Khangaestrophia [Strophodontidae]
- Khangailites [Anthozoa]
- Khasagtina, Ushatinskaya 1987 [Nisusiidae]
- Khasaktia [Stromatoporoidea]
- Khatyspytia [Rangeomorpha]
- Khemisina [Polychaeta]
- Kheraiceras [Tulitidae]
- Kheraites [Oppeliidae]
- Khetatheca [Circothecida]
- Khetella, Beisel 1977 [Buccinidae]
- Khinganospirifer [Mucrospiriferidae]
- Khmeria, Mansuy 1914 [Operculospongia]
- Kholbotchonia [Ancistrorhynchidae]
- Khvalynites, A. A. Shevyrev 1968 [Khvalynitidae]
- Kiaclymenia, Bogoslovsky 1965 [Biloclymeniidae]
- Kiaeria, Stormer 1934 [Leperditicopida]
- Kiaerites, Stasinska 1967 [Theciidae]
- Kiaeroceras, Strand 1934 [Cyrtogomphoceratidae]
- Kiaerograptus [Dendroidea]
- Kiaerolites, Bondarenko 1977 [Proheliolitidae]
- Kiaeromena, Spjeldnaes 1957 [Rafinesquinidae]
- Kiaeropterus, Waterston 1979 [Stylonuridae]
- Kiangsiella, Chao 1927 [Schuchertellidae]
- Kiangsuaspis [Pteraspidomorphes]
- Kiangyousteus, Liu 1955 [Arthrodira]
- Kidderia, Dall 1876 [Cyamiidae]
- Kidjasocyathus [Ajacicyathida]
- Kiehnensus [Problematica]
- Kielania, Vanek 1963 [Harpetidae]
- Kielanopora [Cryptostomata]
- Kielcensia, Czarnocki 1989 [Wocklumeriidae]
- Kielcephyllum, Rozkowska 1969 [Kielcephyllidae]
- Kielcepora [Trepostomida]
- Kielciella [Palaeocopida]
- Kierionopsis [Decapoda]
- Kiesowia, Ulrich and Bassler 1908 [Palaeocopida]
- Kijacyathus [Ajacicyathida]
- Kijanella, Repina 1958 [Ellipsocephalidae]
- Kijoceras [Oncocerida]
- Kikaiarca, Noda 1966 [Arcidae]
- Kikaithyris [Frenulinidae]
- Kikliocythere [Podocopida]
- Kilianella, Uhlig 1905 [Neocomitidae]
- Kilianina [Foraminifera]
- Kilianocaris [Conchyliocarida]
- Kimaspis, Mark-Kurik 1973 [Acanthothoraci]
- Kimatothyris [Spiriferida]
- Kimberella, M. F. Glaessner 1959 [Mollusca]
- Kimberia, Dennis-Bryan and Miles 1983 [Arthrodira]
- Kimberleyichthys, Dennis-Bryan and Miles 1983 [Arthrodira]
- Kimbleia, Coogan 1973 [Caprinuloideidae]
- Kimilites [Anthozoa]
- Kimoceras, Bogoslovsky 1980 [Auguritidae]
- Kimognathus [Conodontophorida]
- Kinaschukoceras [Tarphycerida]
- Kindbladia, Frederickson 1948 [Dokimocephalidae]
- Kindbladochiton [Neoloricata]
- Kinderkaella [Pterioida]
- Kinderlania, Antsygin 1977 [Proetida]
- Kindleoceras, Foerste 1924 [Valcouroceratidae]
- Kinelina [Douvillinidae]
- Kingaspidoides, Hupe 1960 [Ellipsocephalidae]
- Kingaspis, Kobayashi 1935 [Ellipsocephalidae]
- Kingena, Davidson 1852 [Kingenidae]
- Kingenella [Mosaethyrididae]
- Kinghiria [Spiriferidae]
- Kingmaina [Podocopida]
- Kingstonia, Walcott 1924 [Kingstoniidae]
- Kinishbia, Winters 1956 [Palaeostylidae]
- Kinkaidia, Easton 1945 [Polycoeliidae]
- Kinkelinella [Protocytheridae]
- Kinkeliniceras [Cephalopoda]
- Kinnegraptus [Graptoloidea]
- Kinnekullea, Henningsmoen 1948 [Drepanellidae]
- Kionelasma, Simpson 1900 [Streptelasmatidae]
- Kionidella [Cheilostomata]
- Kionoceras, Hyatt 1884 [Kionoceratidae]
- Kionophyllum, Chi 1931 [Geyerophyllidae]
- Kionotrochus, Dennant 1906 [Caryophylliidae]
- Kiotoceras [Endocerida]
- Kiowaia, Frederickson 1949 [Dokimocephalidae]
- Kiparisovia, Bytschkov 1976 [Gymnitidae]
- Kiparisovites, Astachova 1964 [Byrrangoceratidae]
- Kipia [Hippuritida]
- Kirengelia [Ptychopariida]
- Kirkbyella [Kirkbyellidae]
- Kirkbyellina [Podocopida]
- Kirkdomina, Tripp 1962 [Ptychopariida]
- Kirkina [Strophomenidae]
- Kirkoceras, Ulrich and Foerste 1936 [Proterocameroceratidae]
- Kirsoceras, Bogoslovsky 1971 [Kirsoceratidae]
- Kirtonella [Podocopida]
- Kisasacyathus [Ajacicyathida]
- Kishinewia [Archaeogastropoda]
- Kisilia [Martiniidae]
- Kiskinella, Romanenko and Romanenko 1962 [Agnostida]
- Kistocare, Lochmann 1948 [Alokistocaridae]
- Kitabella [Palaeocopida]
- Kitakamilia [Anthozoa]
- Kitakamithyris [Elythidae]
- Kitatites [Discosorida]
- Kitchinites, Spath 1922 [Desmoceratidae]
- Kitsonia [Cardiida]
- Kittlia, Cossmann 1909 [Prostyliferidae]
- Kittliconcha [Settsassiidae]
- Kittlitrochus, Cossmann 1899 [Archaeogastropoda]
- Kiwetinokia, Walcott 1920 [Protospongiidae]
- Kizilia, Degtyarev 1965 [Kiziliidae]
- Kjaerina, Bancroft 1929 [Rafinesquinidae]
- Kjerulfia, Kiaer 1917 [Holmiidae]
- Kjerulfina, Bancroft 1929 [Rafinesquinidae]
- Klaamannipora, Mironova 1974 [Favositidae]
- Kladisoceras [Discosorida]
- Kladognathus, Rexroad 1958 [Conodonta]
- Klakesia [Polychaeta]
- Klapperina [Conodontophorida]
- Klaucena [Rhomboporidae]
- Kleidionella, Canu and Bassler 1917 [Lepraliellidae]
- Kleinacteon, Vokes 1939 [Cephalaspida]
- Kleithriatreta, Roberts and Jell 1990 [Ceratretidae]
- Klematosphinctes [Cephalopoda]
- Kleopatrina, McCutcheon and Wilson 1963 [Kleopatrinidae]
- Klieana [Podocopida]
- Klimphores [Palaeocopida]
- Klinghardtites [Hippuritida]
- Klinglerella [Protocytheridae]
- Klipsteinia, E. v. Mojsisovics 1892 [Trachyceratidae]
- Kloedenella [Kloedenellidae]
- Kloedenellitina [Palaeocopida]
- Kloedenia, Jones and Holl 1886 [Beyrichiidae]
- Klonkina [Palaeocopida]
- Klotziella, Raymond 1928 [Corynexochida]
- Kloucekia, Delo 1935 [Acastidae]
- Klubonibelia [Foraminifera]
- Klubovella, N. S. Lebedeva 1956 [Foraminifera]
- Klukatrypa [Carinatinidae]
- Klytia [Decapoda]
- Knebelia, Van Straelen 1922 [Eryonidae]
- Knechtelia, Lochman 1950 [Trilobita]
- Knefastia, Dall 1919 [Turridae]
- Knightoceras, Miller and Owen 1934 [Koninckioceratidae]
- Knoxiella [Knoxitidae]
- Knoxina [Palaeocopida]
- Knoxites [Palaeocopida]
- Kobayashella, Ivshin 1962 [Asaphida]
- Kobayashia, Harrington 1938 [Asaphidae]
- Kobayashiina [Podocopida]
- Kobayashipeltis, Maksimova 1978 [Corynexochida]
- Kobayshites [Pterioida]
- Kobeha, Merriam 1974 [Halliidae]
- Kobyashiceras [Actinocerida]
- Kobyastraea, Roniewicz 1970 [Kobyastraeidae]
- Kobycoenia, Beauvais 1964 [Scleractinia]
- Kochaspis, Resser 1935 [Ptychopariidae]
- Kochia [Pterioida]
- Kochiella, Poulsen 1927 [Ptychopariidae]
- Kochina, Resser 1935 [Ptychopariidae]
- Kochoceras, Troedsson 1926 [Actinoceratidae]
- Kodonophyllum, Wedekind 1927 [Kodonophyllidae]
- Kodymaspis, Prantl and Pribyl 1950 [Nileidae]
- Kodymirus [Merostomata]
- Koenenites, Wedekind 1913 [Koenenitidae]
- Koeveskallina [Balatonospiridae]
- Kogenium, Kobayashi 1935 [Asaphida]
- Koigia [Meristellidae]
- Koilocoenia, Duncan 1884 [Scleractinia]
- Koilotrochus, Tenison-Woods 1878 [Caryophylliidae]
- Kokanostrea [Pterioida]
- Kokomerena [Camerellidae]
- Kokomopterus [Eurypterida]
- Kokuria, Kobayashi 1935 [Asaphida]
- Kolbaspis, Repina 1979 [Redlichiida]
- Kolbicyathus [Ajacicyathida]
- Kolbinella, Repina 1960 [Asaphida]
- Kolchidina [Haplophragmoiidae]
- Koldinia, Walcott and Resser 1928 [Plethopeltidae]
- Koldiniella, Sivov 1955 [Plethopeltidae]
- Koldophos [Cyclostomata]
- Kolednikella [Palaeocopida]
- Koleostoma [Hexactinosa]
- Kolesnikovella [Foraminifera]
- Kolihaia, Prantl 1944 [Cornulitidae]
- Kolihapeltis, Prantl and Pribyl 1947 [Styginidae]
- Kolihium [Paterinidae]
- Kolmodinia [Tribolbinidae]
- Koloceras, Riccardi et al. 1987 [Oppeliidae]
- Kologyra, Wells 1937 [Rhipidogyridae]
- Kolpura, Resser and Endo 1935 [Trilobita]
- Kolymaspis, Bystrow 1956 [Acanthothoraci]
- Kolymella, Chugaeva 1972 [Phacopida]
- Kolymia [Kolymiidae]
- Kolymonectes [Entolioididae]
- Kolymopora, Preobrazhenskiy 1964 [Parastriatoporidae]
- Kolymoproetus, Maksimova 1978 [Proetida]
- Komaroiella [Palaeocopida]
- Komaspidella, Kobayashi 1938 [Kingstoniidae]
- Komaspis, Kobayashi 1935 [Ptychopariida]
- Komia, Korde 1951 [Axinellida]
- Komiella, Liashenko 1985 [Komiellidae]
- Komioceras, Bogoslovsky 1958 [Koenenitidae]
- Komispirifer [Cyrtospiriferidae]
- Kompsasteria, Roniewicz 1989 [Cyclophylliidae]
- Konbostrea [Pterioida]
- Koneprusia, Prantl and Pribyl 1949 [Odontopleuridae]
- Koneprusites, Pribyl 1964 [Tropidocoryphidae]
- Konglungenoceras, Sweet 1959 [Cyrtogomphoceratidae]
- Konicekion, Snajdr 1975 [Archaeocopida]
- Koninckella, Munier-Chalmas 1880 [Koninckinidae]
- Koninckina, Suess 1853 [Koninckinidae]
- Koninckocarina [Anthozoa]
- Koninckocidaris [Lepidocentridae]
- Koninckodonta [Koninckinidae]
- Koninckophylloides, Gorskiy 1978 [Aulophyllidae]
- Koninckophyllum, Thomson and Nicholson 1876 [Aulophyllidae]
- Konstantia [Thecideidae]
- Konyrium, Nazarov and Popov 1976 [Hexactinellida]
- Kooptoonocrinus, P.A. Jell and D.J. Holloway 1983 [Cladida]
- Kootenia (Walcott 1899) [Dorypygidae]
- Kooteniella, Lermontova 1940 [Dorypygidae]
- Kooteniellina, Sivov 1955 [Corynexochida]
- Kopficrinus, Goldring 1954 [Cladida]
- Kophinoceras [Oncocerida]
- Kophinocrinus, Goldring 1954 [Cladida]
- Koptura, Resser and Endo 1935 [Asaphida]
- Koraipsis, Kobayashi 1934 [Trilobita]
- Kordecyathus [Ajacicyathida]
- Koremagraptus [Dendroidea]
- Korjakirhynchia [Tetrarhynchiidae]
- Kormagnostella, Romanenko 1967 [Agnostidae]
- Kormagnostus, Resser 1938 [Agnostidae]
- Korobkovella [Foraminifera]
- Korobkovia, Gilbert and van de Poel 1965 [Pectinidae]
- Korobkoviella [Cardiida]
- Korobkovitrigonia [Trigoniida]
- Korobovia, Jell 1990 [Calodiscidae]
- Korovina, Iredale 1918 [Vanikoridae]
- Korovinella [Kazakhstanicyathida]
- Korovinia (Iredale 1918) [Neotaenioglossa]
- Korshunovicyathus [Capsulocyathida]
- Korutichthys, Kazantseva-Selezneva 1980 [Palaeonisciformes]
- Koryschisma [Fissiculata]
- Korythoceras [Cardioceratidae]
- Koscoviellina [Palaeocopida]
- Kosirium [Ambocoeliidae]
- Koskinobigenerina [Foraminifera]
- Koskinotextularia [Foraminifera]
- Kosmoceras [Kosmoceratidae]
- Kosmoclymenia, Schindewolf 1949 [Kosmoclymeniidae]
- Kosoidea, Havlicek and Mergl 1988 [Disciniidae]
- Kosoraspis, Gross 1959 [Acanthothoraci]
- Kosovoceras [Tarphycerida]
- Kosovopeltis, Snajdr 1958 [Styginidae]
- Kossmatella, Jacob 1907 [Tetragonitidae]
- Kossmatia, Uhlig [Acanthoceratidae]
- Kossmaticeras, de Grossouvre 1901 [Kossmaticeratidae]
- Kossmaticeras (Grossouvrites), Kilian and Reboul 1909 [Kossmaticeratidae]
- Kotelnyoceras [Discosorida]
- Kotisopeltis, Vanek et al. 1991 [Corynexochida]
- Kotujella, Andreeva 1962 [Matutellidae]
- Kotujotreta [Acrotretidae]
- Kotuyicoscinus [Ajacicyathida]
- Kotylotreta, Koneva 1990 [Acrotretidae]
- Kotysex [Phoenicitoechiidae]
- Kounamkites, Chernysheva 1956 [Ptychopariida]
- Kowalaephyllum [Anthozoa]
- Kozhimites, Kusina 1971 [Muensteroceratidae]
- Kozhuchinella, Severgina 1967 [Billingsellidae]
- Kozlenia [Meristellidae]
- Kozlowskia, Fredericks 1933 [Productidae]
- Kozlowskiaspis, Branisa and Vanek 1973 [Calmoniidae]
- Kozlowskiella [Palaeocopida]
- Kozlowskiellina, Boucot 1958 [Cyrtinopsidae]
- Kozlowskinia, Rozkowska 1969 [Kielcephyllidae]
- Kozlowskiocystia, Stasinska 1969 [Kozlowskiocystiidae]
- Kozlowskites, Havlicek 1952 [Sowerbyellidae]
- Kozlowskitubus [Tuboidea]
- Krachia, Baluk 1975 [Cerithiopsidae]
- Krafftoceras, Diener 1903 [Cyclolobidae]
- Kraftia [Palaeocopida]
- Kraikchania [Mollusca]
- Krama [Isorophida]
- Kranaosphinctes [Perisphinctidae]
- Kransia [Hebetoechiidae]
- Krasnopeevacyathus [Ajacicyathida]
- Krattaspis, Opik 1937 [Phacopida]
- Krausella [Bairdiidae]
- Krausellina [Podocopida]
- Kraussina, Davidson 1859 [Kraussinidae]
- Krebsia, Mörch 1877 [Hipponicidae]
- Krejcigrafella [Schuchertellidae]
- Kreyzstella [Spumellaria]
- Krikoumbilica [Foraminifera]
- Krimella, Kuzmicheva 1980 [Gorgonacea]
- Krinocrinus, Witzke and Strimple 1981 [Monobathrida]
- Kristinella [Hydroida]
- Krithe, Brady et al. 1874 [Krithidae]
- Kritorhynchia [Atrypinidae]
- Krizistrophia [Chilidiopsidae]
- Kroemmelbeinella [Podocopida]
- Kroemmelbeinia [Podocopida]
- Krolina, Repina 1960 [Ptychopariida]
- Kronothoa [Cheilostomata]
- Krotovia [Productellidae]
- Krumbeckia, Arkell 1951 [Tulitidae]
- Krumbeckia [Hippuritida]
- Krumbeckiella, Ichikawa 1958 [Pergamidiidae]
- Kruseicnema [Archaeocyathida]
- Krykyloceras [Nautilida]
- Kryptophanaron, Silvester and Fowler 1927 [Beryciformes]
- Ktenoura, Lane 1971 [Cheiruridae]
- Kuamaia, Hou 1987 [Arthropoda]
- Kuanchuanella [Mollusca]
- Kuangxiastraea, Yu and Kuang 1983 [Phillipsastreidae]
- Kuanyangia, Hupe 1953 [Redlichiidae]
- Kuarnbyella [Cyclostomata]
- Kuehnia [Radiolitidae]
- Kueichouphyllum, Yü 1931 [Aulophyllidae]
- Kueichowella [Monticuliferidae]
- Kueichowia, Lu 1942 [Redlichiida]
- Kueichowlepis, Pan and Wang 1975 [Arthrodira]
- Kueichowpora, Chi 1933 [Syringoporidae]
- Kufengoceras, Ruzhencev 1956 [Cyclolobidae]
- Kufralaria [Nuculida]
- Kugeloceras [Endocerida]
- Kugleria [Requieniidae]
- Kuglerina [Foraminifera]
- Kuhlia, Gill 1861 [Perciformes]
- Kuhnastraea, Cuif 1976 [Reimaniphylliidae]
- Kuia, Marwick 1927 [Veneridae]
- Kuibisia [Medusae]
- Kujandaspis, Ivshin 1953 [Eulomidae]
- Kujandina [Trilobita]
- Kukersella, Toots 1952 [Crownoporidae]
- Kuljumbina, Lazerenko 1960 [Plethopeltidae]
- Kullervo, Opik 1932 [Gonambonitidae]
- Kullingia, Glaessner 1974 [Metazoa]
- Kullmannophyllum [Anthozoa]
- Kulmiella, Hahn 1968 [Proetida]
- Kulparina [Tommotiida]
- Kulumbella, Nikiforova 1960 [Stricklandiidae]
- Kumatostephanus [Stephanoceratidae]
- Kumatrigonia [Trigoniidae]
- Kummelia, L. W. Stephenson 1937 [Gastrochaenidae]
- Kummerowia [Podocopida]
- Kumpanophyllum, Fomichev 1953 [Aulophyllidae]
- Kundatella, Aksarina 1978 [Orthida]
- Kunklerina [Foraminifera]
- Kunlunia [Productidae]
- Kunmingaspis, Lu and Chang 1974 [Ptychopariidae]
- Kunmingella, Huo 1956 [Archaeocopida]
- Kunthia, Schlüter 1885 [Disphyllidae]
- Kunyangella, Huo 1956 [Archaeocopida]
- Kuonamkicornus [Hyolithida]
- Kupenga [Trigoniida]
- Kuraspis, Chernysheva 1959 [Lonchocephalidae]
- Kuresaaria [Ostracoda]
- Kurnubia, Henson 1948 [Pfenderinidae]
- Kurnubiella [Cephalopoda]
- Kuroshioturris, Shuto 1961 [Neogastropoda]
- Kurtinia, Karacabey-Oztemuer 1980 [Radiolitidae]
- Kurtomarginifera [Productellidae]
- Kurtziella, Dall 1918 [Turridae]
- Kusbassophyllum, Dobrolyubova 1966 [Cyathopsidae]
- Kushanites, Ruzhencev and Bogoslovskaya 1975 [Homoceratidae]
- Kushlukia, Daniltshenko 1968 [Kushlukiidae]
- Kutatissites [Ancyloceratidae]
- Kutorgina, Billings 1861 [Kutorginidae]
- Kutorginella [Productidae]
- Kutorginida, order, Kühn 1949 [Kutorginata]
- Kutorgoceras, Balashov 1962 [Endoceratidae]
- Kutsevella [Haplophragmoiidae]
- Kuzminaella [Myodocopida]
- Kvesanirhynchia [Basiliolidae]
- Kwangsia [Athyrididae]
- Kwangsiphyllum, Grabau and Yoh 1931 [Lithostrotionidae]
- Kwangsirhynchus [Pugnacidae]
- Kwangsisaurus, Young 1959 [Eosauropterygia]
- Kwantoella [Foraminifera]
- Kyamodes, Jones 1888 [Beyrichiidae]
- Kyarnbyella [Cyclostomata]
- Kyarocyathus [Monocyathida]
- Kygmaeoceras, Flower 1954 [Calyptoptomatida]
- Kylixocrinus, Eckert 1984 [Monobathrida]
- Kylonisa [Cheilostomata]
- Kymagnostus, Hohensee 1989 [Agnostida]
- Kymataspis, Geyer 1990 [Ellipsocephalidae]
- Kymatothyris [Reticulariidae]
- Kyminoceras, Teichert and Glenister 1954 [Protocycloceratidae]
- Kyndalyna [Archaeogastropoda]
- Kyphocephalus, Miller 1936 [Dokimocephalidae]
- Kyphoclonella, Kolb 1910 [Corallistidae]
- Kyphomopisthia [Palaeocopida]
- Kyphophyllum, Wedekind 1927 [Kyphophyllidae]
- Kyphopyxa [Foraminifera]
- Kyphosus, Lacépède 1802 [Perciformes]
- Kyreocrinus, Aisich 1986 [Diplobathrida]
- Kyrtatrypa [Atrypidae]
- Kyrtogymnodon, Tavani 1955 [Tetraodontiformes]
- Kystodendron [Rhabdopleurida]
- Kysylagathophyllum, Kaplan 1971 [Entelophyllidae]
- Kysylschinopora [Trepostomida]
- Laballa [Laballidae]
- Labechia, Milne-Edwards and Haime 1851 [Labechiidae]
- Labechiella, Yabe and Sugiyama 1930 [Labechiidae]
- Labiocrinus [Cyrtocrinida]
- Labioporella, Harmer 1926 [Steginoporellidae]
- Labiostoma [Foraminifera]
- Labiostria, Palmer 1955 [Aphelaspididae]
- Laboceras, A. A. Shevyrev 1961 [Aplococeratidae]
- Labradoria, Resser 1936 [Edelsteinaspididae]
- Labriproductus [Productidae]
- Labrisomus, Swainson 1839 [Perciformes]
- Labrodon, Gervais 1857 [Labridae]
- Labrosavelum [Palaeocopida]
- Labrostrea, Vialov 1936 [Gryphaeidae]
- Labrotaxis [Holasteroida]
- Labyrinthidoma [Foraminifera]
- Labyrinthina [Orbitopsellidae]
- Labyrinthites, Lambe 1906 [Tetraporellidae]
- Labyrinthoceras [Sphaeroceratidae]
- Labyrinthochitinia [Allogromiidae]
- Labyrinthotuba [Problematica]
- Labyrinthus, Kobluk 1979 [Problematica]
- Lacazella, Munier-Chalmas 1881 [Thecideidae]
- Lacazina [Fabulariidae]
- Lacazinella [Fabulariidae]
- Laccinum [Neogastropoda]
- Laccochilina, Hessland 1949 [Palaeocopida]
- Laccocrinus, Wanner 1949 [Cladida]
- Laccophyllum, Simpson 1900 [Laccophyllidae]
- Laccoprimitia [Palaeocopida]
- Laceratus [Cribricyathea]
- Laceripora, Eichwald 1854 [Theciidae]
- Lacerna [Lacernidae]
- Lachryma, Gray 1832 [Triviidae]
- Lachrymula [Obolidae]
- Lacinia, Conrad 1833 [Buccinidae]
- Laciolina, Iredale 1937 [Tellinidae]
- Lacorsalina, Bursky 1970 [Remopleurididae]
- Lacosteina [Foraminifera]
- Lacriforma [Heterostrophia]
- Lacrimula [Cheilostomata]
- Lactarius, Cuvier and Valenciennes 1833 [Perciformes]
- Laculatina [Foraminifera]
- Laculina [Neoloricata]
- Lacuna, Turton 1827 [Littorinidae]
- Lacunaerhynchia, Almeras 1966 [Cyclothyrididae]
- Lacunaria, Conrad 1866 [Naticidae]
- Lacunella, Deshayes 1861 [Elachisinidae]
- Lacunites, Gorjansky 1969 [Paterinidae]
- Lacunoporaspis, Elkin 1966 [Proetidae]
- Lacunosella, Wisniewska 1932 [Basiliolidae]
- Lacurnaria (Conrad 1866) [Neotaenioglossa]
- Ladaecyathus [Ajacicyathida]
- Ladatheca [Circothecida]
- Ladinotrochus [Archaeogastropoda]
- Ladinula, Bandel 1992 [Ladinulidae]
- Ladjia [Ambocoeliidae]
- Ladogia [Ladogiidae]
- Ladogifornix [Ladogiidae]
- Ladogilina [Ladogiidae]
- Ladogilinella [Ladogiidae]
- Ladogioides [Yunnanellidae]
- Ladoronia [Foraminifera]
- Laemonema, Guenther 1862 [Moridae]
- Laethoprusia, Ramskold 1991 [Odontopleuridae]
- Laetifautor [Archaeogastropoda]
- Laevella, Richards and Palmer 1953 [Strombidae]
- Laevibaculus, Cossmann 1906 [Cryptaulacidae]
- Laevibuccinum, Conrad 1865 [Neogastropoda]
- Laevicarcinus, Lorenthey 1929 [Panopeidae]
- Laevicardium, Swainson 1840 [Cardiidae]
- Laevicirce [Cardiida]
- Laeviconulus [Archaeogastropoda]
- Laevicordia, Seguenza 1876 [Verticordiidae]
- Laevicyphomena [Strophomenidae]
- Laevidentalina [Nodosariidae]
- Laevigaterhynchia [Rhynchonellidae]
- Laevigatocrinus [Isocrinida]
- Laevinerinea [Heterostrophia]
- Laevipatagus [Spatangidae]
- Laevipeneroplis, Sulc 1936 [Peneroplidae]
- Laeviprosopon, M. Glaessner 1933 [Prosopidae]
- Laeviranina [Raninidae]
- Laeviselica [Heterostrophia]
- Laevispirifer [Cyrtiidae]
- Laeviterebrum [Neogastropoda]
- Laevithyris [Triadithyrididae]
- Laevitomaria [Pleurotomariidae]
- Laevitrigonia, Lebkuchner 1932 [Laevitrigoniidae]
- Laevityphis, Cossmann 1903 [Muricidae]
- Laffitteina [Foraminifera]
- Laganoclymenia, Bogoslovsky 1979 [Cymaclymeniidae]
- Lagarodus [Psammodontidae]
- Lagarograptus [Graptoloidea]
- Lagarozoum [Cheilostomata]
- Lagena, Walker and Boys 1784 [Lagenidae]
- Lagenammina, Rhumbler 1911 [Saccamminidae]
- Lagenicyathus [Cribricyathea]
- Lageniocrinus, de Koninck 1854 [Cladida]
- Lagenipora [Celleporidae]
- Lagenochitina [Rhizopodea]
- Lagenoglandulina [Nodosariidae]
- Lagenosypho [Cyclostomata]
- Lagnea, Popescu 1983 [Ellipsolagenidae]
- Lagonibelus [Belemnitida]
- Lagonoecia [Cyclostomata]
- Lagowites, Bogoslovsky 1957 [Praeglyphioceratidae]
- Lagunitus, Olsson 1929 [Potamididae]
- Lagynocystis [Mitrata]
- Lagynopora [Cheilostomata]
- Lahilleona [Cardiida]
- Lahillia, Cossmann 1899 [Lahillidae]
- Laima, Gravitis 1981 [Lingulida]
- Laiocochlis, Dunker and Metzger 1874 [Newtoniellidae]
- Laioporella [Pennospiriferinidae]
- Lajanaster [Brissidae]
- Lajonkairia, Deshayes 1854 [Petricolina]
- Lakaspis, Kobayashi 1937 [Asaphida]
- Lamanskya, Moberg and Segerburg 1906 [Elkaniidae]
- Lamarckella [Foraminifera]
- Lamarckina, Berthelin 1881 [Ceratobuliminidae]
- Lamarmorella [Soritidae]
- Lambdodus [Cladodontidae]
- Lambelasma, Weyer 1973 [Lambelasmatidae]
- Lambeoceras, Foerste 1917 [Gonioceratidae]
- Lambeophyllum, Okulitch 1938 [Lambelasmatidae]
- Lambericeras [Cardioceratidae]
- Lambertechinus [Phymosomatidae]
- Lambertiaster [Palaeostomatidae]
- Lambertona, Sanchez-Roig 1953 [Schizasteridae]
- Lambis, Röding 1798 [Strombidae]
- Lambropsis, Lorenthey 1909 [Xanthidae]
- Lamcispinifera [Strophomenida]
- Lamellaeoporella, Smirnova 1968 [Favositidae]
- Lamellaerhynchia, Burri 1953 [Cyclothyrididae]
- Lamellaria, Montagu 1815 [Velutinidae]
- Lamellastraea, Duncan 1867 [Faviidae]
- Lamellata [Axinellida]
- Lamelliconcha, Dall 1902 [Veneridae]
- Lamelliconchidium, Kulkov 1968 [Subrianidae]
- Lamelliconus [Involutinidae]
- Lamellinucula, Schenck 1944 [Nuculidae]
- Lamelliphorus, Cossmann 1915 [Lamelliphoridae]
- Lamellofungia, Alloiteau 1957 [Agariciidae]
- Lamellopora [Stromatoporoidea]
- Lamellorthoceras, Termier and Termier 1950 [Lamellorthoceratidae]
- Lamellosathyris [Athyrididae]
- Lamina [Haplophragmoiidae]
- Laminatia [Sentosiidae]
- Laminocyathus, Filkorn 1994 [Turbinoliidae]
- Laminononion [Foraminifera]
- Laminopora [Cheilostomata]
- Laminurus, Repina 1959 [Ptychopariidae]
- Lamna, Cuvier 1816 [Lamnidae]
- Lamniformes, order, Berg 1958 [Chondrichthyes]
- Lamontopterus [Eurypterida]
- Lamottia, Raymond 1924 [Lamottiidae]
- Lamottoceras, Flower 1955 [Endoceratidae]
- Lampadaster [Holasteridae]
- Lampadena, Goode and Bean 1893 [Myctophidae]
- Lampadosocrinus, Strimple and Koenig 1956 [Streblocrinidae]
- Lampanella, Mörch 1876 [Batillariidae]
- Lampanyctodes, Fraser-Brunner 1949 [Myctophiformes]
- Lampanyctus, Bonaparte 1840 [Myctophidae]
- Lampasopsis, Jousseaume 1881 [Bursidae]
- Lampichthys, Fraser-Brunner 1949 [Myctophiformes]
- Lampridiformes, order, J. E. Olney et al. 1993 [Actinopteri]
- Lampris, Retzius 1799 [Lampridae]
- Lamprocyclas, Haeckel 1881 [Pterocorythidae]
- Lamprocyrtis, Kling 1973 [Pterocorythidae]
- Lamprodoma, Swainson 1840 [Olividae]
- Lamprodomina [Olividae]
- Lampropeltis [Plethopeltidae]
- Lampterium [Pterocorythidae]
- Lampteroblastus [Edrioasterida]
- Lampterocrinus, Roemer 1860 [Diplobathrida]
- Lamptonium, Haeckel 1887 [Theocotylidae]
- Lamtshinopora [Cystoporata]
- Lanarkia [Thelodontidae]
- Lanarkopora [Fenestrata]
- Lanarkopterus [Eurypterida]
- Lancastria, Kobayashi 1935 [Oryctocephalidae]
- Lanceolatites [Eunicemorpha]
- Lanceomyonia [Hebetoechiidae]
- Lanceopora [Cheilostomata]
- Landanichthys, Dartevelle and Casier 1949 [Perciformes]
- Landeroceras, Foerste 1935 [Cyrtogomphoceratidae]
- Landinia [Crassatellidae]
- Lanecrinus, Kamm and Ausi 1993 [Cladida]
- Laneites, Pribyl and Vanek 1985 [Phacopida]
- Langdaia [Paraparchitidae]
- Langeites [Eunicemorpha]
- Langella, Oliveira 1930 [Lingulidae]
- Langenosolenia [Foraminifera]
- Langgonbole, Kobayashi and Hamada 1973 [Proetida]
- Langgoni, Kobayashi and Hamada 1971 [Phacopida]
- Langkawia [Rhynchonellida]
- Langshanthyris [Laqueidae]
- Langsonella [Pterioida]
- Langtonia [Podocopida]
- Langvophorus, Vu-khuc 1977 [Trapezidae]
- Lanicyathus [Capsulocyathida]
- Lanipustula [Productellidae]
- Lankacythere [Podocopida]
- Lankesterina [Foraminifera]
- Lannacus, Tjernvik 1956 [Asaphida]
- Lanopora [Hyphasmoporidae]
- Lanternarius, Regnell 1956 [Perischoechinoidea]
- Lanternocrinus [Lanternocrinidae]
- Lantschichites [Schubertellidae]
- Laocaetis [Hexactinosa]
- Laosia, Mansuy 1913 [Rhynchonellida]
- Lapasnia [Strophomenida]
- Lapazites [Palaeocopida]
- Lapeirousella, Milovanovic 1938 [Radiolitidae]
- Lapeirousia, Bayle 1878 [Radiolitidae]
- Lapidaria, Tjernvik 1956 [Asaphidae]
- Lapidopiscum, Deflandre and Holdsworth 1958 [Ceratoikiscidae]
- Lapillocystites [Eocrinoidea]
- Lapparia, Conrad 1855 [Volutidae]
- Lapradella [Hebetoechiidae]
- Lapworthicrusta [Crustoidea]
- Laqueoceras [Psiloceratidae]
- Laqueoserpula [Serpulimorpha]
- Laqueus [Laqueidae]
- Larcidium [Spumellaria]
- Larcopyle, Dreyer 1889 [Pyloniidae]
- Larcospira, Haeckel 1887 [Pyloniidae]
- Lardeuxella [Palaeocopida]
- Larifugula, Ludvigsen 1982 [Kingstoniidae]
- Larimus, Cuvier and Valenciennes 1830 [Sciaenidae]
- Lariosaurus, Curioni 1847 [Nothosauridae]
- Larispirifer [Spiriferidae]
- Larium, Gregorio 1930 [Articulata]
- Larkinia, Reinhart 1935 [Arcidae]
- Larma, L. W. Stephenson 1953 [Veneridae]
- Larnacalpis [Spumellaria]
- Larnacantha [Spumellaria]
- Larrazetia [Meandropsinidae]
- Lasaea, Brown 1827 [Lasaeidae]
- Lasaeina, Cossmann 1910 [Galeommatidae]
- Lasaeokellya [Cardiida]
- Lasaeoneaera [Cardiida]
- Lasanius [Birkeniiformes]
- Lasanocrinus, Moore and Plummer 1940 [Pirasocrinidae]
- Lascoa [Semaeostomatida]
- Lasiocladia [Demospongea]
- Lasiocrinus, Kirk 1914 [Cladida]
- Lasiodiscus [Lasiodiscidae]
- Lasiograptus, Lapworth 1873 [Graptoloidea]
- Lasiothrix [Lyssacinosida]
- Lasiotrochus [Foraminifera]
- Lasmosmilia, d'Orbigny 1849 [Montlivaltiidae]
- Latanarcestes, Schindewolf 1933 [Latanarcestidae]
- Latebina [Palaeocopida]
- Latentidiota, Nazarov and Ormiston 1985 [Ruzhencevispongidae]
- Latentifistula, Nazarov and Ormiston 1983 [Latentifistulidae]
- Lateralatirostrum [Leiorhynchidae]
- Latereschara [Cheilostomata]
- Latericriodus [Conodontophorida]
- Laterignathus [Conodontophorida]
- Laterispina [Permianellidae]
- Laternula, Röding 1798 [Laternulidae]
- Laterocavea [Horneridae]
- Laterocea [Cyclostomata]
- Lateroflustrellaria [Cheilostomata]
- Laterophores [Palaeocopida]
- Laterostomella [Foraminifera]
- Laterotecatia [Cheilostomata]
- Laterotubigera [Cyclostomata]
- Lathamella, Liu 1979 [Brachiopoda]
- Lathyrulus [Neogastropoda]
- Latiala, Sohl 1960 [Aporrhaidae]
- Latiaxis, Swainson 1840 [Coralliophilidae]
- Latibolivina [Foraminifera]
- Laticarinina [Foraminifera]
- Laticephalus, Pokrovskaya 1959 [Edelsteinaspididae]
- Laticlypus [Cassiduloida]
- Laticrura, Cooper 1956 [Linoporellidae]
- Latiendothyra [Foraminifera]
- Latiendothyranopsis [Foraminifera]
- Latifusus [Neogastropoda]
- Latikingaspis, Geyer 1990 [Ellipsocephalidae]
- Latiphyllia, Fromentel 1861 [Montlivaltiidae]
- Latiplecus [Elythidae]
- Latiproductus [Monticuliferidae]
- Latiredlichia, Hupe 1953 [Redlichiida]
- Latirhynchia, Fu 1982 [Rhynchonellida]
- Latirolagena, Harris 1897 [Fasciolariidae]
- Latirus, Monfort 1810 [Fasciolariidae]
- Latisageceras, Ruzhencev 1956 [Medlicottiidae]
- Latisipho [Neogastropoda]
- Latium, Blome 1984 [Pseudodictyomitridae]
- Latocamurus, Long 1988 [Arthrodira]
- Latomeandra, Milne-Edwards and Haime 1849 [Latomeandridae]
- Latona, Schumacher 1817 [Donacidae]
- Latonotoechia [Machaerariidae]
- Latoucheia, Hupe 1953 [Trilobita]
- Latrunculia [Hadromerida]
- Latvius [Coelacanthiformes]
- Laubeia, Bittner 1895 [Bivalvia]
- Laubeocrinus [Crinoidea]
- Laubriereia [Cardiida]
- Laudonocrinus, Moore and Plummer 1940 [Cladida]
- Laugeites [Perisphinctidae]
- Laumontoceras, Foerste 1926 [Jovellaniidae]
- Laureloceras, Flower 1949 [Barrandoceratidae]
- Laurelocrinus, Springer 1926 [Monobathrida]
- Laurentaspis, Pageau 1969 [Arthrodira]
- Laurentoscandodus [Conodontophorida]
- Laurieopterus (Kjellesvig-Waering 1966) [Stylonuridae]
- Lautoconus [Neogastropoda]
- Lauzonella, Rasetti 1944 [Ptychopariida]
- Lavenachiton [Neoloricata]
- Lavsanodiscus [Agnostida]
- Laxispira, Gabb 1877 [Turritellidae]
- Laxoendothyra [Foraminifera]
- Laxograptus [Graptoloidea]
- Laxoseptabrunsiina [Foraminifera]
- Lazariella [Cardiida]
- Lazella [Zeilleriidae]
- Lazithyris [Trigonithyrididae]
- Lazutkinia [Lazutkiniidae]
- Leanchoilia, Walcott 1912 [Arachnomorpha]
- Leangella, Opik 1933 [Leptestiidae]
- Lebedictya [Reticulosa]
- Lebediorthis [Orthida]
- Lebesconteia [Archaeostraca]
- Lebetoceras, Teichert and Glenister 1954 [Ellesmeroceratidae]
- Lebetocrinus [Cladida]
- Lebetodiscus, Bather 1908 [Hemicystitidae]
- Lebonichthys, Forey 1973 [Albulidae]
- Lecanella, Zittel 1878 [Lecanellidae]
- Lecanites, E. v. Mojsisovics 1882 [Lecanitidae]
- Lecanoaspis, Ivshin 1962 [Ptychopariida]
- Lecanocrinus [Sagenocrinida]
- Lecanopleura, Raymond 1937 [Ptychopariida]
- Lecanopyge, Raymond 1937 [Illaenuridae]
- Lecfedites, Oliver 1975 [Favositidae]
- Lechites, Nowak 1908 [Baculitidae]
- Lechritrochoceras, Foerste 1926 [Lechritrochoceratidae]
- Leckhamptonia [Cardiida]
- Lecobasicrinus, Strimple and Watkins 1969 [Aesiocrinidae]
- Lecocrinus [Sagenocrinida]
- Lecointriceras [Collignoniceratidae]
- Lecomptella [Stromatoporoidea]
- Lecompteus [Mytilidae]
- Leconteiceras, J. P. Smith 1914 [Clionitidae]
- Lecythiocrinus, White 1880 [Codiacrinidae]
- Lecythocaris, Von Meyer 1858 [Lecythocaridae]
- Lecythocrinus, Mueller 1858 [Cladida]
- Leda (Neilonella), Dall 1881 [Tindariidae]
- Ledahia [Healdiidae]
- Ledella, Verrill and Bush 1897 [Nuculanidae]
- Ledidocidaris [Echinocystitoida]
- Ledina, Dall 1898 [Nuculanidae]
- Ledopsis, Beushausen 1884 [Praenuculidae]
- Leedsichthys, Woodward 1889 [Amiiformes]
- Leella [Staffellidae]
- Leeporina [Trepostomida]
- Lefortia [Faujasiidae]
- Lefroyella, Thomson 1877 [Euretidae]
- Legrandella [Prosomapoda]
- Legumen, Conrad 1858 [Veneridae]
- Lehmaniceras [Muniericeratidae]
- Lehua, Barton 1920 [Cheiruridae]
- Leiagnostus, Jaekel 1909 [Agnostidae]
- Leibaella [Cribricyathea]
- Leichneyella, Opik 1967 [Asaphida]
- Leimitzia, Sdzuy 1955 [Hungaiidae]
- Leinzia [Pholadomyida]
- Leiocarenus, Schrammen 1937 [Corallistidae]
- Leioceras [Graphoceratidae]
- Leiochaetetes [Tabulospongida]
- Leiochonetes [Rugosochonetidae]
- Leiochonia, Schrammen 1901 [Azoricidae]
- Leiocoryphe, Clark 1924 [Plethopeltidae]
- Leiocyamus [Palaeocopida]
- Leiocyphus [Temnopleuridae]
- Leiodermatium [Demospongea]
- Leiodon, Owen 1841 [Pythonomorpha]
- Leiodorella, Zittel 1878 [Scleritodermatidae]
- Leiodus [Leiodontidae]
- Leiodysodonta [Nuculida]
- Leioechinus [Echinoidea]
- Leiognathus, Lacépède 1802 [Leiognathidae]
- Leiolambrus, A. Milne-Edwards 1879 [Parthenopidae]
- Leionucula, Quenstedt 1930 [Nuculidae]
- Leiopathes [Antipatharia]
- Leiopecten, Khalfin 1940 [Leiopectinidae]
- Leiopedina [Pedinidae]
- Leiophyllites, C. Diener 1915 [Palaeophyllitidae]
- Leiophyllum, Schrammen 1924 [Theonellidae]
- Leioprimitia [Palaeocopida]
- Leioproductus [Productidae]
- Leiopteria, Hall 1883 [Pterineidae]
- Leiopyrga, Adams 1863 [Trochidae]
- Leiorhinus, Gabb 1860 [Gastropoda]
- Leiorhynchoides [Rhynchonellida]
- Leiorhynchus, Hall 1860 [Leiorhynchidae]
- Leioscutellum, Wu 1977 [Ptychopariida]
- Leiosella [Cheilostomata]
- Leioseptathyris [Stringocephalidae]
- Leiosoecia [Cyclostomata]
- Leiosolenus [Mytilida]
- Leiospongia, d'Orbigny 1849 [Pharetrospongiidae]
- Leiostegina, Kobayashi 1937 [Homalonotidae]
- Leiostegium, Raymond 1913 [Leiostegiidae]
- Leiostomaster [Palaeostomatidae]
- Leiostraca, Adams and Adams 1853 [Melanellidae]
- Leiostracosia, Schrammen 1902 [Ventriculitidae]
- Leiostrototropis, Kobayashi 1937 [Phacopida]
- Leiothycridina [Athyrididae]
- Lejopyge, Hawle and Corda 1847 [Ptychagnostidae]
- Lekocrinus, Kamm and Ausi 1994 [Cladida]
- Lekythionia [Cyclostomata]
- Lekythoglena [Cheilostomata]
- Lekythopora [Celleporidae]
- Lembitites [Palaeocopida]
- Lembitsarvella [Palaeocopida]
- Lembulus, Leach 1826 [Nuculanidae]
- Lemdadella, Sdzuy 1978 [Redlichiidae]
- Lemennocrinus, Pidel 1984 [Diplobathrida]
- Lemintina, Risso 1826 [Vermetidae]
- Lemniscaterina, order, Gallitelli 1979 [Hydrozoa]
- Lemniscolittorina, N. F. Sohl 1960 [Mathildidae]
- Lemuroceras [Cleoniceratidae]
- Lenacare, Egorova 1976 [Alokistocaridae]
- Lenadiscus, Repina 1965 [Agnostida]
- Lenaella [Problematica]
- Lenaella [Scenellidae]
- Lenalitus [Hyolithida]
- Lenallina, Repina 1990 [Olenellida]
- Lenaspis, Survorova 1959 [Corynexochida]
- Lenatella [Palaeocopida]
- Lenatoechia, Nikiforova 1970 [Trigonirhynchiidae]
- Lenella [Pterioida]
- Lenicyamidia [Fibulariidae]
- Leniechinus [Clypeasteroida]
- Leniocythere [Podocopida]
- Lenita [Clypeasteroida]
- Lenitrophon, Finlay 1927 [Muricidae]
- Lenneocrinus, Jaekel 1918 [Monobathrida]
- Lennukella [Palaeocopida]
- Lenobelus [Belemnitida]
- Lenocyathus [Ajacicyathida]
- Lenodus [Conodontophorida]
- Lenotropites, Y. N. Popov 1961 [Longobarditidae]
- Lenticeras, Gerhardt 1898 [Sphenodiscidae]
- Lenticorbula [Myoida]
- Lenticularis [Bellerophontida]
- Lenticulinella [Foraminifera]
- Lentidium, Cristofori 1832 [Corbulidae]
- Lentigo, Jousseaume 1886 [Strombidae]
- Lentilla [Pterioida]
- Lentipecten, Marwick 1928 [Pectinidae]
- Lentitheca, Sysoyev 1958 [Orthothecidae]
- Lenzia [Theodossiidae]
- Leocephalus, Ivshin 1962 [Ptychopariida]
- Leodia [Mellitidae]
- Leolasma, Kaljo 1956 [Streptelasmatidae]
- Leonardoceras [Oncocerida]
- Leonardophyllum, Moore and Jeffords 1941 [Verbeekiellidae]
- Leonaspis, R. Richter and E. Richter 1917 [Odontopleuridae]
- Leonotus [Chondrichthyes]
- Leontiella [Obolidae]
- Leopecten, Masuda 1971 [Pectinidae]
- Leophyllites, C. Diener 1915 [unclassified genus]
- Leopoldia, Mayer-Eymar 1887 [Neocomitidae]
- Lepadocystis, Carpenter 1891 [Rhombifera]
- Lepadolepis, White and Moy-Thomas 1940 [Antiarcha]
- Lepas, Linnaeus 1758 [Lepadidae]
- Leperditella [Palaeocopida]
- Leperditelloides [Palaeocopida]
- Leperditia, Rouault 1851 [Leperditiidae]
- Leperditicopida, order, Scott 1961 [Ostracoda]
- Lepeta, Gray 1842 [Lepetidae]
- Lepetella, Verrill 1880 [Lepetellidae]
- Lepiconus, Stoppani 1857 [Scleractinia]
- Lepicythara, Olsson 1964 [Turridae]
- Lepidaspis, Dineley and Loeffler 1976 [Corvaspididae]
- Lepidechinus [Lepidocentridae]
- Lepidenteron [Terebellomorpha]
- Lepidesthes [Lepidesthidae]
- Lepidion, Swainson 1838 [Moridae]
- Lepidocalix [Diploporita]
- Lepidocardia [Cardiida]
- Lepidochitona, Gray 1821 [Ischnochitonidae]
- Lepidocoleomorpha, order, Schallreuter 1985 [Machaeridia]
- Lepidocoleus, Faber 1886 [Lepidocoleomorpha]
- Lepidoconia, Wilson 1946 [Hemicystitidae]
- Lepidocottus, Sauvage 1875 [Scorpaeniformes]
- Lepidocyclina [Lepidocyclinidae]
- Lepidocycloides, Nikiforova and Andreeva 1961 [Trigonorhynchiidae]
- Lepidocyclus, Y. Wang 1949 [Rhynchotrematidae]
- Lepidocystis, Foerste 1938 [Imbricata]
- Lepidodiscus, Meek and Worthen 1868 [Agelacrinitidae]
- Lepidogobius, Gill 1859 [Perciformes]
- Lepidoleptaena, Havlicek 1963 [Rafinesquinidae]
- Lepidomena, Laurie 1991 [Leptellinidae]
- Lepidophyllia, Duncan 1868 [Stylophyllidae]
- Lepidopleurus, Gray 1847 [Leptochitonidae]
- Lepidoproetus, Erben 1951 [Tropidocoryphidae]
- Lepidopus, Gouan 1770 [Trichiuridae]
- Lepidorbitoides [Lepitorbitoididae]
- Lepidorhombus, Guenther 1862 [Pleuronectiformes]
- Lepidorthis [Glyptorthidae]
- Lepidosemicyclina [Foraminifera]
- Lepidospongia, Roemer 1864 [Ventriculitidae]
- Lepidotrigla, Guenther 1860 [Scorpaeniformes]
- Lepidotrochus [Cirridae]
- Lepidozona, Pilsbry 1892 [Ischnochitonidae]
- Lepismatina [Lepismatinidae]
- Lepisosteus, de Lacepède 1803 [Lepisosteidae]
- Lepocrinites, Conrad 1840 [Rhombifera]
- Lepophidium [Ophidiidae]
- Leporemax, Iredale 1937 [Volutidae]
- Leporicypraea, Iredale 1930 [Cypraeidae]
- Leporimetus [Cardiida]
- Lepralia [Lepraliidae]
- Lepralina [Cheilostomata]
- Leproconcha [Pterioida]
- Lepsiella, Iredale 1912 [Muricidae]
- Lepsithais [Neogastropoda]
- Leptaena, J. W. Dalman 1828 [Rafinesquinidae]
- Leptaenisca [Leptaenoideidae]
- Leptaenoidea, Hedström 1917 [Leptaenoideidae]
- Leptaenomendax [Leptaenoideidae]
- Leptaenopyxis, Havlícek 1963 [Rafinesquinidae]
- Leptagonia [Rafinesquinidae]
- Leptaleoceras, Buckman 1918 [Hildoceratidae]
- Leptalosia [Strophalosiidae]
- Leptastrea, Milne-Edwards and Haime 1848 [Faviidae]
- Leptathyris [Athyrididae]
- Leptaxinus, Verrill 1898 [Thyasiridae]
- Leptechinus [Phymosomatidae]
- Leptechioceras [Echioceratidae]
- Leptecodon, S.W. Williston 1899 [Enchodontidae]
- Leptegauana [Neogastropoda]
- Leptelasma [Anthozoa]
- Leptella, Hall and Clarke 1892 [Taffiidae]
- Leptellina, Ulrich and Cooper 1936 [Leptellinidae]
- Leptelloidea, Jones 1928 [Leptellinidae]
- Leptembolon [Obolidae]
- Leptesthes [Cardiida]
- Leptestia, Bekker 1922 [Leptestiidae]
- Leptestiina, Opik 1933 [Leptestiidae]
- Lepteviella [Nuculida]
- Lepthoplites [Hoplitidae]
- Leptobolbina [Palaeocopida]
- Leptobolus, Hall 1871 [Obolidae]
- Leptobrachites [Rhizostomatida]
- Leptocardia, Meek 1876 [Cardiidae]
- Leptocaryorhynchus [Leiorhynchidae]
- Leptoceras, Uhlig 1883 [Protancyloceratidae]
- Leptocheilopora [Cribrilinidae]
- Leptochilodiscus, Rasetti 1966 [Weymouthiidae]
- Leptochirognathus [Conodontophorida]
- Leptochiton, Gray 1847 [Leptochitonidae]
- Leptochondria, Bittner 1891 [Hunanopectinidae]
- Leptochonetes [Strophochonetidae]
- Leptocidaris [Pedinoida]
- Leptocoelia [Leptocoeliidae]
- Leptoconus, Swainson 1840 [Conidae]
- Leptocottus, Girard 1854 [Scorpaeniformes]
- Leptocyathus, Milne-Edwards and Haime 1850 [Caryophylliidae]
- Leptocystis [Rhombifera]
- Leptocythere [Podocopida]
- Leptodesma, Hall 1883 [Pterineidae]
- Leptodonta [Strophodontidae]
- Leptodontella [Douvillinidae]
- Leptograptus [Graptoloidea]
- Leptolacis, Schrammen 1937 [Craticulariidae]
- Leptolepides, Nybelin 1974 [Orthogonikleithridae]
- Leptomaria, E. Eudes-Deslongchamps 1864 [Pleurotomariidae]
- Leptomitella, Rigby 1986 [Leptomitidae]
- Leptomithrax, Miers 1876 [Majidae]
- Leptomitus, Walcott 1886 [Leptomitidae]
- Leptomurex [Neogastropoda]
- Leptomussa, d'Archiardi 1867 [Mussidae]
- Leptomya, A. Adams 1864 [Semelidae]
- Lepton, Turton 1822 [Leptonidae]
- Leptonotoceras [Polymorphitidae]
- Leptopecten, Verrill 1897 [Pectinidae]
- Leptophragma, Zittel 1877 [Craticulariidae]
- Leptophyllaraea, Alloiteau 1952 [Haplaraeidae]
- Leptophyllastraea, Oppenheim 1930 [Latomeandridae]
- Leptophyllia, Reuss 1854 [Acrosmiliidae]
- Leptopilus, Raymond 1924 [Trilobita]
- Leptoplastides, Raw 1908 [Olenidae]
- Leptoplastus, Angelin 1854 [Ptychopariida]
- Leptopleurus [Temnopleuridae]
- Leptopora [Cyclostomata]
- Leptopoterion [Heteractinida]
- Leptoprimitia [Palaeocopida]
- Leptopterygius, Huene 1929 [Ichthyopterygia]
- Leptoredlichia, Chang 1966 [Redlichiidae]
- Leptoria, Milne-Edwards and Haime 1848 [Merulinidae]
- Leptosalenia, Smith and Wright 1990 [Salenioida]
- Leptoscapha, Fischer 1883 [Volutidae]
- Leptoschisma, A. Breimer and D. B. Macurda 1972 [Fissiculata]
- Leptoscopus, Gill 1859 [Perciformes]
- Leptoseris, Milne-Edwards and Haime 1849 [Agariciidae]
- Leptosocyathus [Ajacicyathida]
- Leptosolen, Conrad 1865 [Pharidae]
- Leptosphinctes [Cephalopoda]
- Leptospira [Rhynchospirinidae]
- Leptosteus, Jaeckel 1919 [Arthrodira]
- Leptostraca, order, Claus 1880 [Malacostraca]
- Leptostrophia, Hall and Clarke 1892 [Leptostrophiidae]
- Leptostrophiella [Leptostrophiidae]
- Leptostyrax, Williston 1900 [Eoptolamnidae]
- Leptosurcula, Casey 1904 [Neogastropoda]
- Leptotetragonites, Spath 1927 [Lytoceratidae]
- Leptoteuthis [Teuthida]
- Leptothyra, Pease 1869 [Turbinidae]
- Leptothyropsis [Turbinidae]
- Leptotrigonia [Trigoniida]
- Leptotriticites [Schwagerinidae]
- Leptotrypa, Ulrich 1883 [Heterotrypidae]
- Leptotrypella, Vinassa de Regny 1921 [Atactotoechidae]
- Lercarella [Monticuliferidae]
- Lercaritubus [Preperonidellidae]
- Lermontovia, Suvorova 1956 [Redlichiida]
- Lernella [Foraminifera]
- Lerouxia [Demospongea]
- Leshanella, Li 1975 [Archaeocopida]
- Lesleya [Podocopida]
- Lesliella [Anthozoa]
- Lesperonia [Archaeogastropoda]
- Lessnikovaea, Sokolov 1951 [Billingsariidae]
- Lestidiops [Alepisauriformes]
- Lestrodus [Edestidae]
- Lethops, Hubbs 1926 [Perciformes]
- Leuconia [Calcaronea]
- Leucorhynchia, Crosse 1867 [Turbinidae]
- Leucosia, Weber 1795 [Leucosiidae]
- Leucosilia, Bell 1855 [Leucosiidae]
- Leucosyrinx, Dall 1889 [Turridae]
- Leucozonia, Gray 1847 [Fasciolariidae]
- Leufroyia [Neogastropoda]
- Leukadiella [Hildoceratidae]
- Leukomoides [Cardiida]
- Leupoldina [Foraminifera]
- Leurelasma [Anthozoa]
- Leuresthes, Jordan and Gilbert 1880 [Atherinidae]
- Leuroceras, Hyatt 1893 [Trigonoceratidae]
- Leurorthoceras, Foerste 1921 [Actinoceratidae]
- Leurospondylus, Brown 1913 [Elasmosauridae]
- Leurotrochoceras, Foerste 1926 [Lechritrochoceratidae]
- Leutorhinion [Conodontophorida]
- Leveillites [Graptolithina]
- Levella [Archaeogastropoda]
- Levenea, Schuchert and Cooper 1931 [Dalmanellidae]
- Leviathania, Golovinova and Korotkov 1986 [Purpurinidae]
- Levibiseptum [Ambocoeliidae]
- Leviceraurus, Hessin 1988 [Phacopida]
- Leviconchidiella [Gypidulidae]
- Levicyathus, Filkorn 1994 [Turbinoliidae]
- Leviechinus [Somaliasteridae]
- Leviella [Podocopida]
- Levifenestella [Fenestellidae]
- Levifusus, Conrad 1865 [Melongenidae]
- Levigatella, Andronov 1961 [Gypidulidae]
- Levipugnax [Rozmanariidae]
- Levipustula [Productellidae]
- Levisaspis, Rasetti 1943 [Norwoodiidae]
- Levisella, Ulrich 1930 [Idahoiidae]
- Levisettius [Phyllodocemorpha]
- Levisia, Walcott 1911 [Trilobita]
- Levisoceras, Foerste 1925 [Ellesmeroceratidae]
- Levispira [Lissatrypidae]
- Levisulculus [Palaeocopida]
- Levitusia [Productellidae]
- Lewesiceras, Spath 1939 [Pachydiscidae]
- Lewisiella [Ataphridae]
- Lewyites [Diplomoceratidae]
- Leymeriella [Leymeriellidae]
- Liagnshanella [Ostracoda]
- Liantuoia [Arthropoda]
- Liaoningella, Lu and Qian 1983 [Asaphida]
- Liaoyangaspis, Chang 1957 [Asaphiscidae]
- Liardiphyllum, Sutherland 1954 [Uraliniidae]
- Liardites, E. T. Tozer 1963 [Trachyceratidae]
- Liasina [Cyprididae]
- Liasopteron [Podocopida]
- Libanoberyx, Gayet 1980 [Beryciformes]
- Libanoteuthis, Kretzoi 1942 [Teuthida]
- Libinia, Leach 1815 [Epialtidae]
- Libodiscus [Problematica]
- Libotonius, Wilson 1977 [Perciformes]
- Librovitschiceras, Shimanskiy 1957 [Aipoceratidae]
- Libumella [Aparchitidae]
- Libyaconchus [Bivalvia]
- Libyaeglossa [Obolidae]
- Libyaerhynchus [Trigonirhynchiidae]
- Libycerithium, Chacchia-Rispoli 1937 [Neotaenioglossa]
- Libycoceras [Sphenodiscidae]
- Libys [Productidae]
- Libys, Munster 1842 [Mawsoniidae]
- Lichakephalina, Antsygin 1973 [Lichida]
- Lichakephalus, Sdzuy 1955 [Lichakephalidae]
- Lichapyge, Callaway 1874 [Ceratopygidae]
- Licharewia [Licharewiidae]
- Lichas, Dalman 1827 [Lichidae]
- Lichenalia, Hall 1851 [Rhinoporidae]
- Lichenaria, Winchell and Schuchert 1895 [Lichenariidae]
- Lichengia, Kobayashi 1942 [Asaphida]
- Lichenoides, Barrande 1846 [Diploporita]
- Lichenopora [Lichenoporidae]
- Lichenotrypa [Cystoporata]
- Lichida, order, R. C. Moore 1959 [Trilobita]
- Lichnatrypa [Atrypidae]
- Lichuanopora [Disjectoporidae]
- Lichuanospongia, Zhang 1983 [Sebargasiidae]
- Lichvinia [Palaeocopida]
- Licmosinion [Lychniscosa]
- Licnograptus [Dendroidea]
- Lidaconus [Problematica]
- Liebusella [Foraminifera]
- Lienardia [Neogastropoda]
- Lievinella [Rhipidiothyrididae]
- Ligatella, von Martens 1880 [Pomatiidae]
- Ligerina [Podocopida]
- Ligiscus, Lane and Owens 1982 [Styginidae]
- Ligonodina [Conodonta]
- Ligulalepis, Schultze 1968 [Sarcopterygii]
- Ligulella [Pachycormiformes]
- Liguloclema [Etherellidae]
- Ligyrokala [Mollusca]
- Likinia [Hydrozoa]
- Lilangina [Pterioida]
- Lilax, Finlay 1926 [Siliquariidae]
- Liliaspis [Pteraspidomorphes]
- Liliocrinus [Millericrinida]
- Liljevallia, Hedstrom 1917 [Leptaenoideidae]
- Lilliputianella [Foraminifera]
- Lilloettia, Crickmay 1930 [Sphaeroceratidae]
- Liloa, Pilsbry 1921 [Cephalaspida]
- Lima, Bruguière 1797 [Limidae]
- Limacina, Bosc 1817 [Limacinidae]
- Limaites [Cephalopoda]
- Limanda, Gottsche 1835 [Pleuronectiformes]
- Limanomia [Pterioida]
- Limarca, Tate 1886 [Philobryidae]
- Limaria, Link 1807 [Limidae]
- Limatia [Palaeocopida]
- Limatuella [Pterioida]
- Limatula, Wood 1839 [Limidae]
- Limatulina [Pterioida]
- Limbatrypa [Punctatrypidae]
- Limbifera [Productellidae]
- Limbimurina [Rafinesquinidae]
- Limbinaria [Palaeocopida]
- Limbinariella [Palaeocopida]
- Limburgina [Podocopida]
- Limea, Bronn 1831 [Limidae]
- Limipecten, Girty 1903 [Aviculopectinidae]
- Limneria, Adams and Adams 1853 [Velutinidae]
- Limopsis, Sassi 1827 [Limopsidae]
- Limoptera, Hall 1869 [Pterineidae]
- Limpeina, Ogienko 1984 [Ptychopariida]
- Limpidograptus [Graptoloidea]
- Limstrophina [Parallelelasmatidae]
- Limulatys, Iredale 1936 [Cephalaspida]
- Limulavida, order, Walcott 1912 [Merostomoidea]
- Limulitella [Xiphosurida]
- Limuloides, Woodward 1865 [Planaterga]
- Limulus [Xiphosurida]
- Linaresia [Foraminifera]
- Linchengoceras, Obata 1940 [Cephalopoda]
- Linderina [Foraminifera]
- Lindisfarnia [Podocopida]
- Lindstroemella, Hall and Clarke 1892 [Disciniidae]
- Lindstroemia, Nicholson and Thomson 1876 [Lindstroemiidae]
- Lindstroemophyllum, Wang 1947 [Amplexidae]
- Linearia (Conrad 1860) [Tellinidae]
- Lineastroma, Khalfina and Yavorsky [Stromatoporidae]
- Linemera, Finlay 1924 [Rissoidae]
- Linetia, Chavan 1959 [Mactromyidae]
- Linevitus, Syssoiev 1958 [Sulcavitidae]
- Linga, de Gregorio 1885 [Lucinidae]
- Lingatrypa [Lissatrypidae]
- Linglingella [Archaeogastropoda]
- Lingshanella [Meganterididae]
- Linguaclymenia, Korn and Price 1987 [Kosmoclymeniidae]
- Linguagnostus, Kobayashi 1939 [Diplagnostidae]
- Linguaphillipsia, C.J. Stubblefield 1948 [Proetidae]
- Linguaproetus, Alberti and Ruchholz 1964 [Proetida]
- Linguatornoceras, House 1965 [Tornoceratidae]
- Linguchuangia, Zhang 1983 [Corynexochida]
- Linguisaukia, Peng 1984 [Saukiidae]
- Lingukainella, Kobayashi 1953 [Asaphida]
- Lingula, Bruguiére 1797 [Lingulidae]
- Lingulapholis, Schuchert 1913 [Craniopsidae]
- Lingularia, Biernat and Emig 1993 [Lingulidae]
- Lingulasma [Lingulasmatidae]
- Lingulata, class, Gorjansky and Popov 1985 [Linguliformea]
- Lingulella, Salter 1866 [Obolidae]
- Lingulellotreta, Koneva 1983 [Lingulellotretidae]
- Lingulepis [Obolidae]
- Lingulibolina [Palaeocopida]
- Lingulina [Lagenidae]
- Lingulipora, Girty 1898 [Lingulida]
- Lingulobolus [Obolidae]
- Lingulodiscina, Whitfield 1890 [Disciniidae]
- Lingulogavelinella [Gavelinellidae]
- Lingulonodosaria [Ichthyolariidae]
- Lingulops [Obolidae]
- Linguopugnoides [Camarotoechiidae]
- Lingyunites [Galfettitidae]
- Liniaxis [Neogastropoda]
- Linnarssonella, C. Walcott 1902 [Acrotretidae]
- Linnarssonia, Walcott 1885 [Acrotretidae]
- Linobrachiocrinus, Goldring 1939 [Cladida]
- Linochitina [Rhizopodea]
- Linochone, Schrammen 1937 [Cylindrophymatidae]
- Linocrinus, Goldring 1939 [Cladida]
- Linograptus [Graptoloidea]
- Linonema, Laubenfels 1955 [Euretidae]
- Linoporella, Schuchert and Cooper 1931 [Linoporellidae]
- Linoprotonia [Monticuliferidae]
- Linopyrga [Pyramidellidae]
- Linostrophomena [Glyptomenidae]
- Linotaxis [Fenestrata]
- Linotrigonia, van Hoepen 1929 [Trigoniidae]
- Linsayella [Palaeocopida]
- Linsdallia [Pterioida]
- Linstroemoceras [Ascocerida]
- Linter, L. W. Stephenson 1937 [Arcidae]
- Linterella [Trigonirhynchiidae]
- Linthia, Desor 1853 [Schizasteridae]
- Linucula, J.A. Marwick 1931 [Nuculidae]
- Linuparus, A. White 1847 [Palinuridae]
- Linxiangxiella [Rhynchonellida]
- Lioberus, Dall 1898 [Mytilidae]
- Liobole, R. Richter and E. Richter 1949 [Proetidae]
- Liobolina, R. Richter and E. Richter 1949 [Proetidae]
- Liocare, Suvorova 1981 [Ptychopariida]
- Liocarenus, Harris & Burrows 1891 [Cephalaspida]
- Liocaris, Van Straelen 1924 [Decapoda]
- Lioceratoides, Spath 1919 [Hildoceratidae]
- Liocerithium, Tryon 1887 [Cerithiidae]
- Liochlamys, Dall 1889 [Fasciolariidae]
- Liocium, Gabb 1869 [Pseudomelaniidae]
- Lioclemella, Foerste 1895 [Batostomellidae]
- Liocnemis, Kielan 1960 [Pterygometopidae]
- Liocoelia [Meristidae]
- Lioconcha, Mörch 1853 [Veneridae]
- Liocyma, Dall 1870 [Veneridae]
- Liodesmus, Wagner 1859 [Amiidae]
- Liodonax [Cardiida]
- Lioharpes, Whittington 1950 [Harpetidae]
- Liokootenia, Qiu 1983 [Corynexochida]
- Lioleptaena [Rafinesquinidae]
- Liolophops, Struve 1972 [Phacopida]
- Liomegalaspides, Lu and Chang 1974 [Asaphidae]
- Liomesus, Stimpson 1865 [Neogastropoda]
- Liomolgocrinus, Strimple 1963 [Monobathrida]
- Lioparella, Kobayashi 1937 [Proasaphiscidae]
- Lioparia, Lorenz 1905 [Asaphiscidae]
- Liopelta, Suvorova 1981 [Ptychopariida]
- Liopeplum, Dall 1890 [Volutidae]
- Liopistha, Meek 1864 [Poromyidae]
- Lioporida [Trepostomida]
- Liosolenopleura, Thoral 1947 [Ptychopariida]
- Liosphaera [Spumellaria]
- Liosphinctes [Cephalopoda]
- Liospiriferina, Rousselle 1977 [Spiriferinidae]
- Liostracina, Monke 1903 [Liostracinidae]
- Liostracinoides, Raymond 1937 [Phylacteridae]
- Liostracus [Andrarinidae]
- Liostrea, Douvillé 1904 [Gryphaeidae]
- Liostrophia, Cooper and Kindle 1936 [Parastrophinidae]
- Liotella [Archaeogastropoda]
- Lioteuthis, Naef 1921 [Lioteuthididae]
- Liothyrella, Thomson 1916 [Terebratulidae]
- Liothyris, Conrad 1873 [Tellinidae]
- Liotia, Gray 1842 [Liotiidae]
- Liotina, Fischer 1885 [Liotiidae]
- Liotrigonia [Trigoniida]
- Liparoceras, Hyatt 1867 [Liparoceratidae]
- Liparocrinus, Goldring 1923 [Glossocrinidae]
- Lipinella [Biseriamminidae]
- Lipinellina [Foraminifera]
- Lipmanium, Pessagno 1969 [Neosciadiocapsidae]
- Lipopora [Anthozoa]
- Lippistes, Monfort 1810 [Capulidae]
- Lippsina [Foraminifera]
- Lipsanocystis, Ehlers and Leighley 1922 [Rhombifera]
- Lipuites [Tibetitidae]
- Liracassis, Moore 1963 [Cassididae]
- Lirachiton [Neoloricata]
- Liracraea [Neogastropoda]
- Liraspirifer [Cyrtospiriferidae]
- Liratilia [Neogastropoda]
- Liratomina [Neogastropoda]
- Liriamnica, Shergold 1980 [Trilobita]
- Liricamera [Camerellidae]
- Liriospyris, Haeckel 1881 [Triospyrididae]
- Liriplica [Punctospiriferidae]
- Liripora [Cyclostomata]
- Lirobittium, Bartsch 1911 [Procerithiidae]
- Lirodiscus, Conrad 1869 [Astartidae]
- Lirofusus, Conrad 1865 [Fasciolariidae]
- Liromissus [Cardiida]
- Lironoba, Iredale 1915 [Lironobinae]
- Lirophora, Conrad 1863 [Veneridae]
- Lirosoma [Fasciolariidae]
- Lirotheca [Hyolithida]
- Lirularia, Dall 1909 [Trochidae]
- Lisania, Walcott 1911 [Lisaniidae]
- Lisaniella, Chang 1963 [Lisaniidae]
- Lisbonia [Neogastropoda]
- Lischkeia, Fischer 1879 [Turcicidae]
- Liscombea, Ross 1961 [Plasmoporidae]
- Lisgodus [Petalodontidae]
- Liskeardia, Wilson 1939 [Endoceratidae]
- Lisogoragnostus, Rozova 1988 [Phalacromidae]
- Lisogorites, Chugaeva 1958 [Asaphidae]
- Lispoceras, Hyatt 1893 [Trigonoceratidae]
- Lispodesthes, White 1877 [Aporrhaidae]
- Lissapiopsis [Neogastropoda]
- Lissatrypa, Twenhofel 1914 [Lissatrypidae]
- Lissatrypella [Lissatrypidae]
- Lissatrypoidea [Lissatrypidae]
- Lissella [Wellerellidae]
- Lissidium, Lenz 1989 [Subrianidae]
- Lissoberyx, Patterson 1967 [Beryciformes]
- Lissocardia, von Meyer 1851 [Litogastroidae]
- Lissoceras, Bayle 1879 [Cephalopoda]
- Lissoceratoides [Lissoceratidae]
- Lissochilus, Zittel 1882 [Neritidae]
- Lissochlamis [Pterioida]
- Lissoclymenia, Korn and Price 1987 [Kosmoclymeniidae]
- Lissocoelia, Bassler 1927 [Streptosolenidae]
- Lissocoelina, Schuchert and Cooper 1931 [Pentameridae]
- Lissodus, Brough 1935 [Lonchidiidae]
- Lissoleptaena [Rafinesquinidae]
- Lissomarginifera [Productidae]
- Lissomuricopsis [Neogastropoda]
- Lissonia [Cephalopoda]
- Lissopecten, Verrill 1897 [Pterioida]
- Lissopleura, Whitfield 1896 [Trigonirhynchiidae]
- Lissopsis [Decapoda]
- Lissospira [Archaeogastropoda]
- Lissostrophia [Strophodontidae]
- Lissotesta, Iredale 1915 [Turbinidae]
- Lissotestella, Powell 1946 [Archaeogastropoda]
- Lissothyris [Harpotothyrididae]
- Lissotreta [Triplesiidae]
- Listraspis [Pteraspidomorphes]
- Listroteuthis, Naef 1922 [Teuthida]
- Litagnostus, Rasetti 1944 [Diplagnostidae]
- Litaspis, Suvorova 1960 [Ptychopariida]
- Litavkaspis [Agraulidae]
- Lithacoceras, Hyatt 1900 [Ataxioceratidae]
- Lithancylus [Cephalopoda]
- Lithapium [Spumellaria]
- Litharaeopsis, Beauvais 1982 [Microsolenidae]
- Lithatractus [Spumellaria]
- Lithelius, Haeckel 1860 [Litheliidae]
- Lithioperna [Pterioida]
- Lithistida, order, Schmidt 1870 [Demospongea]
- Lithobotrys [Nassellaria]
- Lithocalamus, Lupher and Packard 1930 [Hippuritida]
- Lithocampana [Nassellaria]
- Lithocampe [Lithocampida]
- Lithocarpium [Nassellaria]
- Lithochytris, Ehrenberg 1847 [Theoperidae]
- Lithocrinus [Sagenocrinida]
- Lithocyclia, Ehrenberg 1847 [Coccodiscidae]
- Lithognathus, Swainson 1839 [Perciformes]
- Lithomelissa, Ehrenberg 1847 [Plagoniidae]
- Lithomespilus, Haeckel 1887 [Stylosphaeridae]
- Lithomitra [Nassellaria]
- Lithopera, Ehrenberg 1847 [Eucyrtidiidae]
- Lithophaga, Röding 1798 [Mytilidae]
- Lithophylax, A. Milne-Edwards and Brocchi 1879 [Lithophylacidae]
- Lithophyllon, Rehberg 1892 [Fungiidae]
- Lithophysema, Stewart 1926 [Cephalaspida]
- Lithopora [Axinellida]
- Lithorhizostomatida, order [Scyphozoa]
- Lithornithium [Nassellaria]
- Lithostrobilis [Demospongea]
- Lithostrobus [Nassellaria]
- Lithostrotion, Fleming 1828 [Lithostrotionidae]
- Lithostrotionella, Yabe and Hayasaka 1915 [Petalaxidae]
- Lithostrozionoides (Alloiteau 1952) [Meandrinidae]
- Lithotrochus, Conrad 1855 [Trochidae]
- Litigiella [Cardiida]
- Litilpetalichthyes [Petalichthyida]
- Litiopa, Rang 1829 [Litiopidae]
- Litocephalus, Resser 1937 [Aphelaspididae]
- Litoceras, Hyatt 1883 [Trocholitidae]
- Litocrinus, Lane and Sevastopulo 1982 [Allagecrinidae]
- Litogaster, Von Meyer 1847 [Litogastroidae]
- Litogyroceras, Teichert and Glenister 1952 [Rutoceratidae]
- Litometopus, Rasetti 1966 [Agnostida]
- Litophyllum, Etheridge 1899 [Chaetetidae]
- Litoptychius [Coelacanthiformes]
- Litothyris [Skelidorygmidae]
- Litotrigonia [Trigoniida]
- Litschkovitrigonia [Trigoniida]
- Littoraria, Griffith and Pigeon 1834 [Littorinidae]
- Littorina, Ferussac 1821 [Littorinidae]
- Littoriniscala, de Boury 1887 [Epitoniidae]
- Littorinolacuna, Cossmann 1919 [Turbinidae]
- Littorinopsis, Mörch 1876 [Littorinidae]
- Littorinopsis (Styloplocus), Cossmann 1923 [Littorinidae]
- Littorniscala (de Boury 1887) [Neotaenioglossa]
- Lituites, Bertrand 1763 [Lituitidae]
- Lituola [Lituolidae]
- Lituolipora [Foraminifera]
- Lituonelloides [Foraminifera]
- Lituotuba, Rhumbler 1895 [Lituotubidae]
- Lituotubella [Foraminifera]
- Lituyapecten [Pterioida]
- Litvolasma [Anthozoa]
- Liujiangolepis, Wang 1987 [Antiarcha]
- Liujingnia [Podocopida]
- Livarella, Kozur and Mostler 1981 [Livarellidae]
- Livonia, Gray 1855 [Volutidae]
- Liwia, Dzik and Lendzion 1988 [Liwiidae]
- Lixatrypa [Karpinskiidae]
- Lixouria [Podocopida]
- Liza, Jordan and Swain 1884 [Perciformes]
- Ljaschenkovia, Batrukova 1969 [Trematidae]
- Ljaschenkovites [Tentaculitida]
- Ljubimovella [Podocopida]
- Ljudmilispirifer [Adolfiidae]
- Llandeilochiton [Neoloricata]
- Llanoaspidella, Tasch 1951 [Llanoaspididae]
- Llanoaspis, Lochman 1938 [Llanoaspididae]
- Llanoella [Camerellidae]
- Lloydolithus, Bancroft 1933 [Trinucleidae]
- Lobalocrinus, Knapp 1969 [Cladida]
- Lobantale, Cossmann 1888 [Gadilinidae]
- Lobatula [Foraminifera]
- Lobendoceras, Teichert and Glenister 1954 [Proterocameroceratidae]
- Lobianchia, Gatt 1904 [Myctophidae]
- Lobiochrea, Val'kov and Sysoev 1970 [Trilobozoa]
- Loboarochiton [Neoloricata]
- Lobobactrites, Schindewolf 1932 [Bactritidae]
- Lobocarcinus, Reuss 1857 [Cancridae]
- Lobocephalina, Ruzicka 1940 [Conokephalinidae]
- Lobocorallium, Nelson 1963 [Streptelasmatidae]
- Lobocyclendoceras [Endocerida]
- Lobograptus [Graptoloidea]
- Loboidothyropsis [Lobothyrididae]
- Lobokosmokeras [Kosmoceratidae]
- Lobolytoceras, Buckman 1923 [Lytoceratidae]
- Lobomelocrinus, Frest and Strimple 1977 [Monobathrida]
- Lobonotus, A. Milne-Edwards 1863 [Tumidocarcinidae]
- Lobophyllia, Blainville 1830 [Mussidae]
- Lobopora [Cheilostomata]
- Lobopsammia, Milne-Edwards and Haime 1848 [Dendrophylliidae]
- Lobopterus, Gorjanovic-Kramberger 1895 [Beryciformes]
- Loborina [Lambdarinidae]
- Loboseris, Beauvais 1982 [Latomeandridae]
- Lobosiphon, Flower 1956 [Proterocameroceratidae]
- Lobosoecia [Cyclostomata]
- Lobosphinctes [Perisphinctidae]
- Lobotornoceras, Schindewolf 1936 [Tornoceratidae]
- Lochkothele, Havlicek and Mergl 1988 [Disciniidae]
- Lochkovella, Chlupac 1972 [Phacopidae]
- Lochmaeosmilia, Wells 1943 [Amphiastreidae]
- Lochmanaspis, Ivshin 1962 [Ptychopariida]
- Lochriea, Scott 1942 [Ozarkodinida]
- Lockhartia [Rotaliidae]
- Lockportia [Polychaeta]
- Locularia [Cyclostomata]
- Loculibairdia [Podocopida]
- Loculibolbina [Palaeocopida]
- Loculicyathus [Archaeocyathida]
- Loculicytheretta [Podocopida]
- Loculipora [Fenestrata]
- Loculitheca, Sysoyev 1968 [Turcuthecidae]
- Loculocavata [Palaeocopida]
- Loczyceras [Reineckeiidae]
- Lodderena, Iredale 1924 [Archaeogastropoda]
- Lodderia, Tate 1899 [Vitrinellidae]
- Loeblichia [Loeblichiidae]
- Loemmelella [Pterioida]
- Loenthyris [Terebratulida]
- Loerentheya, Beurlen 1929 [Retroplumidae]
- Loftusia [Loftusiidae]
- Loganella [Rhipidomellidae]
- Loganellia, Fredholm 1990 [Loganelliidae]
- Loganellus, Devine 1863 [Idahoiidae]
- Loganoceras, Foerste 1932 [Oncoceratidae]
- Loganograptus, Hall 1868 [Graptoloidea]
- Loganopeltis, Rasetti 1943 [Ptychopariida]
- Loganopeltoides, Rasetti 1945 [Harpididae]
- Logocrinus, W. Goldring 1923 [Poteriocrinidae]
- Loilemia [Lissatrypidae]
- Loisthostomata [Foraminifera]
- Lokius [Palaeocopida]
- Lokutella [Prionorhynchiidae]
- Loligo, Schneider 1784 [Teuthida]
- Loligosepia, Quenstedt 1839 [Loligosepiidae]
- Lomasulcachites [Siphogonuchitidae]
- Lomatiocyathus [Cribricyathea]
- Lomatiphora [Productidae]
- Lomatobolbina [Palaeocopida]
- Lomatopisthia [Palaeocopida]
- Lomatorthis [Glyptorthidae]
- Lombardia [Problematica]
- Lomia [Thecosomata]
- Lomirosa, L. W. Stephenson 1941 [Melongenidae]
- Lomonossovella [Cephalopoda]
- Lomsucaspis [Trilobita]
- Lonchidium, D'Eichwald 1860 [Turmalitidae]
- Lonchistium, Myers 1935 [Perciformes]
- Lonchocephalus, Owen 1852 [Lonchocephalidae]
- Lonchocrinus, Jaekel 1908 [Cyrtocrinida]
- Lonchodina [Prioniodidae]
- Lonchodomas, Angelin 1854 [Raphiophoridae]
- Lonchograptus [Graptoloidea]
- Lonchosaccus [Problematica]
- Londinia [Podocopida]
- Longaeviceras [Cardioceratidae]
- Longaevus [Cribricyathea]
- Longchaeus, Mörch 1875 [Pyramidellidae]
- Longdongshuia [Pugnacidae]
- Longduia, Lu et al. [Corynexochida]
- Longianda, Hupe 1952 [Redlichiida]
- Longiapertina [Hauerinidae]
- Longicyathus [Cribricyathea]
- Longidaonella [Pterioida]
- Longidorsa [Palaeocopida]
- Longimactra, Finlay 1928 [Mactridae]
- Longiproetus, Cavet and Pillet 1958 [Proetidae]
- Longiscula [Metacopida]
- Longispina [Chonetidae]
- Longithyris [Terebratulida]
- Longitubus [Serpulimorpha]
- Longlinophyllia [Heterocorallia]
- Longobardites, E. v. Mojsisovics 1882 [Longobarditidae]
- Longobarditoides, A. A. Shevyrev 1961 [Longobarditidae]
- Longoconcha, L. W. Stephenson 1941 [Pholidotomidae]
- Longulatus [Tentaculitida]
- Longusorbis, B. Richards 1975 [Longusorbiidae]
- Longxianirhynchia [Trigonorhynchiidae]
- Longyuanella [Podocopida]
- Lonsda [Hexactinosa]
- Lonsdaleia, McCoy 1849 [Axophyllidae]
- Lonsdaleoides, Heritsch 1936 [Geyerophyllidae]
- Loomberaphyllum, Pedder 1965 [Cyathophyllidae]
- Looneyella [Podocopida]
- Lopadiocrinus, Wanner 1916 [Cladida]
- Lopanella [Hexactinosa]
- Loparia [Cardiida]
- Lopasnia [Productidae]
- Lopatinia, Schmidt 1872 [Cucullaeidae]
- Loperia [Protorthidae]
- Lopha, Röding 1798 [Ostreidae]
- Lophamplexus, Moore and Jeffords 1941 [Lophophyllidae]
- Lophelia, Milne-Edwards and Haime 1849 [Caryophylliidae]
- Lophiiformes, order [Actinopteri]
- Lophiodolodus, Stirton 1947 [Mammalia]
- Lophiokephalion, Kobayashi 1988 [Proetida]
- Lophiostomus, Egerton 1852 [Eugnathidae]
- Lophiostroma, Nicholson 1891 [Lophiostromatidae]
- Lophioturris [Turridae]
- Lophobalanus [Cirripedia]
- Lophoblastus, R. R. Rowley 1901 [Spiraculata]
- Lophocardium, Fischer 1887 [Cardiidae]
- Lophocarinophyllum, Grabau 1922 [Lophophyllidiidae]
- Lophoceras, Hyatt 1893 [Koninckioceratidae]
- Lophoclema [Cystoporata]
- Lophocochlias, Pilsbry 1921 [Turbinidae]
- Lophoconus [Nassellaria]
- Lophocorys [Nassellaria]
- Lophocrinus, Meyer 1858 [Cladida]
- Lophoctenella [Podocopida]
- Lophocyrtis, Haeckel 1887 [Lophocyrtiidae]
- Lophocythere [Podocopida]
- Lophodentina [Podocopida]
- Lophogaster [Lophogastrida]
- Lophogastrida, order, G. O. Sars 1870 [Malacostraca]
- Lophoholcus, Opik 1976 [Asaphida]
- Lophokloedenia, Swartz and Whitmore 1956 [Beyrichiidae]
- Lopholasma, Simpson 1900 [Stereolasmatidae]
- Lopholepsis [Cyclostomata]
- Lopholobites [Pulchelliidae]
- Lophopanopeus, Rathbun 1898 [Panopeidae]
- Lophophaena, Ehrenberg 1847 [Lophophaenidae]
- Lophophrentis, Chi 1935 [Aulophyllidae]
- Lophophyllidium, Grabau 1928 [Lophophyllidiidae]
- Lophophyllum, Milne-Edwards and Haime 1850 [Lophophyllidae]
- Lophoranina, R. Fabiani 1910 [Raninidae]
- Lophoraninella, Glaessner 1946 [Raninidae]
- Lophosmilia, Milne-Edwards and Haime 1848 [Caryophylliidae]
- Lophospyris, Haeckel 1881 [Triospyrididae]
- Lophosteus, Pander 1856 [Osteichthyes]
- Lophotichium, Moore and Jeffords 1945 [Lophotichiidae]
- Lopingoceras, Shimanskiy 1962 [Spyroceratidae]
- Lorangerella [Hypothyridinidae]
- Lordorthis, Ross 1959 [Hesperorthidae]
- Lordshillia, Whittard 1966 [Trinucleidae]
- Loreleiella [Eodevonariidae]
- Lorenzella, Kobayashi 1935 [Lorenzellidae]
- Lorenziella [Calpionellida]
- Lorica, H. Adams and A. A 1852 [Schizochitonidae]
- Loricella, Pilsbry 1893 [Schizochitonidae]
- Loriculina, Dames 1885 [Stramentidae]
- Lorieroceras, Foerste 1926 [Nothoceratidae]
- Loriolella [Echinoidea]
- Loriolia [Pseudodiadematidae]
- Loriolicrinus, Jaekel 1918 [Comatulida]
- Loriolipedina [Pedinidae]
- Loriolithyris, Middlemiss 1968 [Sellithyrididae]
- Lorioloceras [Oppeliidae]
- Loriolometra [Comatulida]
- Loripes, Poli 1791 [Lucinidae]
- Loripinus, Monterosato 1883 [Lucinidae]
- Losvia [Trigonirhynchiidae]
- Lota, Oken 1817 [Gadiformes]
- Lotagnostus, Whitehouse 1936 [Agnostidae]
- Lotocrinus [Crinoidea]
- Lotosoides, Shergold 1975 [Trilobita]
- Lottia, Gray 1833 [Lottiidae]
- Louisella [Miskoiidae]
- Louisettita [Foraminifera]
- Loutriella [Palaeocopida]
- Louza [Podocopida]
- Lovarina, Beschin et al. 1991 [Raninidae]
- Lovcenipora [Demospongea]
- Lovenia, Desor 1847 [Loveniidae]
- Lovenilampas [Cassiduloida]
- Lovetcheniia [Hippuritida]
- Lowenstamia [Neogastropoda]
- Lowenstamia [Magilidae]
- Lowoceras, Foerste and Savage 1927 [Lowoceratidae]
- Loxo [Cardiida]
- Loxobidens [Thecosomata]
- Loxocardium, Cossmann 1886 [Cardiidae]
- Loxoceras, M'Coy 1844 [Orthocerida]
- Loxochoanella, Teichert and Glenister 1954 [Ellesmeroceratidae]
- Loxoconcha, G. O. Sars 1866 [Loxoconchidae]
- Loxoconchella [Podocopida]
- Loxocorniculum, Benson and Coleman 1963 [Podocopida]
- Loxocrinus [Mespilocrinidae]
- Loxocythere [Podocopida]
- Loxodus [Conodontophorida]
- Loxoglypta [Cardiida]
- Loxonepea, Opik 1970 [Trilobita]
- Loxoptychodon [Corbiculidae]
- Loxoptyxis [Heterostrophia]
- Loxorynchus, Stimpson 1857 [Decapoda]
- Loxostomina [Foraminifera]
- Loxostomoides [Foraminifera]
- Loxostomum [Foraminifera]
- Loxotaphrus, Harris 1897 [Buccinidae]
- Loxotoma, Fischer 1885 [Emarginulinae]
- Loyolophyllum, Chapman 1914 [Stauriidae]
- Luanquella [Chonetidae]
- Luaspis, Hupe 1953 [Ptychopariida]
- Lublinella [Ostracoda]
- Lublinophyllum, Khoa 1977 [Cyathopsidae]
- Lubowastraea, Melnikova 1986 [Zardinophyllidae]
- Lubrzankiella [Palaeocopida]
- Lucapina, Sowerby 1835 [Fissurellidae]
- Lucapinella, Pilsbry 1890 [Fissurellidae]
- Lucerapex, Iredale 1936 [Turridae]
- Lucidestea, Laseron 1956 [Rissoidae]
- Luciellina [Pleurotomariida]
- Lucina, Bruguière 1797 [Lucinidae]
- Lucina (Here), Gabb 1866 [Lucinidae]
- Lucinaxinus [Cardiida]
- Lucinella, di Monterosato 1883 [Lucinidae]
- Luciniola, Skeat and Madsen 1898 [Lucinidae]
- Lucinisca, Dall 1901 [Lucinidae]
- Lucinoma, Dall 1901 [Lucinidae]
- Luciploma, Olsson 1942 [Veneridae]
- Luciter [Palaeocopida]
- Ludbrookia [Carditidae]
- Ludictyon, Ozaki 1938 [Aulaceratidae]
- Ludvigsenites [Ostracoda]
- Ludwigia [Graphoceratidae]
- Lugalella, G. Hahn and I. Wunn-Petry 1983 [Proetidae]
- Lugoviella [Mitrosagophora]
- Lugtonia, Cummings 1955 [Foraminifera]
- Luhaia, Roomusoks 1956 [Strophomenidae]
- Luhops [Centropleuridae]
- Luhotreta, Mergl and Slehoferova 1990 [Acrotretidae]
- Luisichthys [Pachycormiformes]
- Luisiella [Pachycormiformes]
- Lukatiella [Problematica]
- Lumbriconereis [Eunicemorpha]
- Lunacephalus, Ivshin 1962 [Ptychopariida]
- Lunacrania, Ivshin 1962 [Missisquoiidae]
- Lunalepis, Mader 1986 [Cladoselachida]
- Lunanoceras [Ellesmerocerida]
- Lunarca, Gray 1857 [Arcidae]
- Lunaspis, Broili 1929 [Petalichthyida]
- Lunatia, Gray 1847 [Naticidae]
- Lunatriella [Foraminifera]
- Lunella [Turbinidae]
- Luniprisma [Metacopida]
- Luniulicardia [Cardiida]
- Lunolenus, Lotze 1958 [Redlichiida]
- Lunpolaia [Capillithyrididae]
- Lunucammina [Geinitzinidae]
- Lunulacyathus [Ajacicyathida]
- Lunularia [Lunulariidae]
- Lunulites, Lamarck 1816 [Calloporidae]
- Lunuloceras [Oppeliidae]
- Luofuia, Xu 1977 [Spiriferida]
- Luojiashania, Chang 1974 [Proetidae]
- Luolishania [Luolishaniidae]
- Luottuolingia [Ptychopariida]
- Lupherella [Monotidae]
- Lupherites [Cephalopoda]
- Lupira, L. W. Stephenson 1941 [Vasidae]
- Lupitschia [Scleractinia]
- Luponovula, Sacco 1894 [Eocypraeidae]
- Lupopsyrus, Bernacsek and Dineley 1977 [Climatiiformes]
- Luppovella, Nikolov 1966 [Neocomitidae]
- Lurgiticoma, Popov 1980 [Ephippelasmatidae]
- Lusampa, Petrunina 1990 [Trilobita]
- Lusatiops, Richter 1941 [Ellipsocephalidae]
- Lusitanichthys, Gavet 1980 [Clupavidae]
- Luterella [Trigonirhynchiidae]
- Lutesvillia, Cullison 1944 [Bathyuridae]
- Lutetia [Kelliellidae]
- Lutetiaster [Schizasteridae]
- Lutima [Gastropoda]
- Lutraria, Lamarck 1799 [Mactridae]
- Luvarus, Rafinesque 1810 [Perciformes]
- Luvula [Podocopida]
- Luxella, Rasetti 1955 [Ptychopariida]
- Luxilites [Crossognathiformes]
- Luxocrinus, Witzke and Strimple 1981 [Diplobathrida]
- Luxuridacna [Cardiida]
- Luyanhaoia, Wittke 1984 [Ptychopariida]
- Lycettia, Cox 1937 [Mytilidae]
- Lycetticeras [Tulitidae]
- Lychniscaulus, Schrammen 1937 [Ventriculitidae]
- Lychniscosa, order, Schrammen 1903 [Hexactinellida]
- Lychnocanium, Ehrenberg 1847 [Theoperidae]
- Lychnocanoma, Haeckel 1887 [Ultranaporidae]
- Lychnoceras [Oncocerida]
- Lychnodictyum [Nassellaria]
- Lychnothyris, Voros 1983 [Plectoconchidae]
- Lyckholmoceras, Teichert 1930 [Diestoceratidae]
- Lycodopsis, Collett 1879 [Gadiformes]
- Lycodopsis, Collett 1879 [Perciformes]
- Lyconectes, Gilbert 1895 [Perciformes]
- Lycophoria, Lahusen 1885 [Lycophoriidae]
- Lycopterocypris [Podocopida]
- Lydiaspis, Suvorova 1981 [Ptychopariida]
- Lydiphnis, Melvill [Adeorbidae]
- Lyecoceras, Mutvei 1957 [Paraphragmitidae]
- Lyelliceras, Spath 1921 [Lyelliceratidae]
- Lygdozoon, Holloway 1981 [Dalmanitidae]
- Lyidium [Demospongea]
- Lyliophyllum, Kelus 1939 [Stauriida]
- Lymnorella [Stellispongiidae]
- Lynaspis, Opik 1967 [Asaphida]
- Lyonicrinus, Springer 1926 [Monobathrida]
- Lyonsia, Turton 1822 [Lyonsiidae]
- Lyopora, Nicholson and Etheridge 1878 [Lyoporidae]
- Lyopsetta, Jordan and Goss 1887 [Pleuronectiformes]
- Lyosoma [Neritidae]
- Lyralichas, Weber 1948 [Lichida]
- Lyratellina, Olsson 1961 [Tellinidae]
- Lyreidus, De Haan 1841 [Raninidae]
- Lyria, Gray 1847 [Volutidae]
- Lyriaspis, Whitehouse 1939 [Ptychopariidae]
- Lyricocarpus [Cornuta]
- Lyrielasma, Hill 1939 [Ptenophyllidae]
- Lyrioceras, Foerste 1927 [Nephriticeratidae]
- Lyriochlamys, Sobetski 1977 [Pectinidae]
- Lyriocrinus, Hall 1852 [Diplobathrida]
- Lyriomyophoria, Kobayashi 1954 [Myophoriidae]
- Lyriopecten, Hall 1877 [Pterinopectinidae]
- Lyrocardium, Meek 1876 [Cardiidae]
- Lyrocladia [Fenestellidae]
- Lyrodesma, Conrad 1841 [Lyrodesmatidae]
- Lyrodictya [Reticulosa]
- Lyrodobankia [Myoida]
- Lyrogoniatites, Miller and Furnish 1940 [Cravenoceratidae]
- Lyrolepis, Romanowski 1886 [Elopiformes]
- Lyromangelia [Neogastropoda]
- Lyropecten, Conrad 1862 [Pectinidae]
- Lyropora [Fenestellidae]
- Lyroporella [Fenestrata]
- Lyroporidra [Fenestrata]
- Lyropurpura [Neogastropoda]
- Lyrosurcula [Neogastropoda]
- Lyrotyphis, Jousseaume 1880 [Muricidae]
- Lysactinella [Hexactinellida]
- Lysagoroceras [Discosorida]
- Lysagoroceras, Schönenberg 1952 [Poterioceratidae]
- Lysaretides [Eunicemorpha]
- Lysella [Foraminifera]
- Lysidium, Havlicek 1985 [Gypidulidae]
- Lysigypa, Havlicek and Kukal 1990 [Gypidulidae]
- Lysiogyrus, Youluo 1978 [Hydrobiidae]
- Lysiosquilla [Stomatopoda]
- Lysis, Gabb 1864 [Trichotropidae]
- Lysocystites [Eocrinoidea]
- Lysogorella [Palaeocopida]
- Lyssacinosida, order [Hexactinellida]
- Lytechinus, A. Agassiz 1863 [Toxopneustidae]
- Lyticoceras, Hyatt 1900 [Neocomitidae]
- Lytoceras, Suess 1865 [Lytoceratidae]
- Lytoceras (Tetragonites), Kossmat 1895 [Tetragonitidae]
- Lytocrioceras [Cephalopoda]
- Lytodiscoides [Desmoceratidae]
- Lytogyroceras [Cephalopoda]
- Lytohoplites [Neocomitidae]
- Lytvolasma, Soshkina 1925 [Antiphyllidae]
- Lytvophyllum, Dobrolyubova 1941 [Petalaxidae]
- Lywcea [Pterioida]
- Maakina [Strophomenidae]
- Mabella, Klenina 1984 [Leptellinidae]
- Mabellarca, Iredale 1939 [Arcidae]
- Mabiania [Problematica]
- Mabianoconullus [Scyphozoa]
- Macalia, H. Adams 1860 [Tellinidae]
- Macaliopsis [Tellinidae]
- Macandrevia [Zeilleriidae]
- Macandrewia [Demospongea]
- Macandrewites [Demospongea]
- Macannaia, Jell 1975 [Eodiscidae]
- Macarocrinus, Jaekel 1895 [Diplobathrida]
- Maccoyella [Oxytomidae]
- Maccoyoceras, Miller et al. 1933 [Trigonoceratidae]
- Maccullochella, Whitley 1929 [Perciformes]
- Macelloura, Resser 1935 [Ptychopariida]
- Macerodus [Conodontophorida]
- Macgeea, Webster 1889 [Phillipsastraeidae]
- Macgeopsis, Alloiteau 1957 [Ellipsosmiliidae]
- Machaeracanthus, Newberry 1857 [Acanthoessidae]
- Machaeraria [Machaerariidae]
- Machaeratoechia [Machaerariidae]
- Machaeridia, class [Annelida]
- Machaerocolella, Li and Han 1980 [Trimerellidae]
- Machaerodonax [Cardiida]
- Machaerognathus, Hussakof and Bryant 1919 [Dinichthyidae]
- Machairagnostus, Harrington and Leanza 1957 [Diplagnostidae]
- Machinosaurus [Reptilia]
- Machomya [Pholadomyida]
- Mackenzia, Briggs et al 1994 [Actiniaria]
- Mackenziecyathus [Ajacicyathida]
- Mackenziephyllum, Pedder 1971 [Cystiphyllidae]
- Mackenziurus, Edgecom 1990 [Encrinuridae]
- Maclarenella [Cranaenidae]
- Macnamaratylus [Crinoidea]
- Macoma, Leach 1819 [Tellinidae]
- Macoma (Panacoma), Olsson 1942 [Cardiida]
- Macomona, Finlay 1926 [Tellinidae]
- Macoploma (Pilsbry and Olsson 1941) [Tellinidae]
- Macrepistius, Cope 1895 [Amiiformes]
- Macridiscus [Cardiida]
- Macroaulostomus, Blot 1981 [Aulostomidae]
- Macroblepharum, Alberti 1964 [Tropidocoryphidae]
- Macrocallista, Meek 1876 [Veneridae]
- Macrocaris [Archaeostraca]
- Macrocephalites [Macrocephalitidae]
- Macrocheira, De Haan 1839 [Inachidae]
- Macrochlamis [Pectinidae]
- Macrocoelia [Rafinesquinidae]
- Macrocrinus, Jaekel 1895 [Monobathrida]
- Macrocypraea, Woodring 1957 [Cypraeidae]
- Macrocyprina [Myodocopida]
- Macrocypris [Macrocyprididae]
- Macrocyproides [Podocopida]
- Macrodentina [Podocopida]
- Macrodiadema [Diadematoida]
- Macrodomoceras, Teichert and Glenister 1952 [Polyelasmoceratidae]
- Macrodon, Buckman 1882 [Parallelodontidae]
- Macrodonax [Cardiida]
- Macrodontella [Arcida]
- Macrodostomia [Heterostrophia]
- Macrogrammus, Whittard 1966 [Pilekiidae]
- Macroloxoceras, Flower 1957 [Pseudorthoceratidae]
- Macromphalus, S. W. Wood 1842 [Vanikoridae]
- Macron, H. Adams and A. A 1853 [Pseudolividae]
- Macroniscus, Thiele 1928 [Pseudolividae]
- Macronoda, Lochmann 1964 [Ptychaspididae]
- Macronotella, Ulrich 1894 [Aparchitidae]
- Macropetalichthys, Norwood and Owen 1846 [Macropetalichthyida]
- Macrophthalmus, Latreille 1823 [Macrophthalmidae]
- Macropipus, Prestandrea 1833 [Macropipidae]
- Macroplata, Swinton 1930 [Rhomaleosauridae]
- Macropleura, Boucot 1963 [Cyrtiidae]
- Macropneustes, L. Agassiz 1847 [Brissidae]
- Macropomoides, Woodward 1942 [Latimeriidae]
- Macropora [Macroporidae]
- Macroporina [Macroporidae]
- Macropotamorhynchus [Trigonirhynchiidae]
- Macropterygius, Huene 1922 [Ichthyopterygia]
- Macropyge, Stubblefield 1927 [Ceratopygidae]
- Macropygella, Rosov and Dubatolova 1985 [Asaphida]
- Macrosarisa [Podocopida]
- Macroscaphites, Meek 1876 [Macroscaphitidae]
- Macrosemiiformes, order [Actinopteri]
- Macrosinus [Neogastropoda]
- Macrosolen [Cardiida]
- Macrostylocrinus [Patelliocrinidae]
- Macrotoxus, Lorenz 1906 [Asaphida]
- Macrotrigonia, Camacho and Olivero 1985 [Trigoniida]
- Macrourogaleus, Fowler 1947 [Paleospinacidae]
- Macrozafra [Neogastropoda]
- Macrurella [Neogastropoda]
- Macruronus, Guenther 1873 [Gadiformes]
- Macrypsilon [Podocopida]
- Mactra, Linnaeus 1767 [Mactridae]
- Mactrellona, Marks 1915 [Mactridae]
- Mactrinula, Gray 1853 [Mactridae]
- Mactrodesma [Mactridae]
- Mactromeris, Conrad 1868 [Mactridae]
- Mactromya, Agassiz 1843 [Mactromyidae]
- Mactromyopsis, Chavan 1905 [Mactromyidae]
- Mactrona [Cardiida]
- Mactropsis [Mactridae]
- Madariscus, Wade 1941 [Archaeomaenidae]
- Madarocephalus, Resser 1938 [Catillicephalidae]
- Madiella [Neogastropoda]
- Madonia, Senowbari-Daryan and Schäfer 1986 [Agelasida]
- Madracis, Milne-Edwards and Haime 1849 [Astrocoeniidae]
- Madrepora, Linne 1758 [Oculinidae]
- Maduiya, Rozova 1963 [Aphelaspididae]
- Madygenia, Petrunina 1975 [Rorringtoniidae]
- Maeandrograptus [Graptoloidea]
- Maeandropolydora, Voigt 1965 [Ichnofossils]
- Maeandroseris, Rousseau 1854 [Siderastreidae]
- Maelonoceras, A. Hyatt 1884 [Oncoceratidae]
- Maemia [Productellidae]
- Maenioceras, Schindewolf 1933 [Maenioceratidae]
- Maenioceras (Hyatt 1884) [Sporadoceratidae]
- Maennilicrinus, Rozhnov 1988 [Crinoidea]
- Mafoletia [Chondrichthyes]
- Magadiceramus, Heinz 1932 [Inoceramidae]
- Magadina, Thomson 1915 [Terebratellidae]
- Magadinella, Thomson 1915 [Terebratellidae]
- Magas, Sowerby 1816 [Terebratulida]
- Magdoceras [Tarphycerida]
- Magella [Terebratellidae]
- Magellania, Bayle 1880 [Terebratellidae]
- Magharithyris [Terebratulida]
- Maghrebeis [Ostracoda]
- Maghrebella, Freneix 1972 [Carditidae]
- Magicostrophia [Chilidiopsidae]
- Magila, Munster 1839 [Axiidae]
- Magilus, Monfort 1810 [Magilidae]
- Magnacephalus, Stitt 1971 [Ptychopariida]
- Magnea [Cheilostomata]
- Magnederella [Stenolaemata]
- Magnesoina [Foraminifera]
- Magnicanalis, Rowell 1962 [Obolellidae]
- Magnicapulus [Archaeogastropoda]
- Magniventra [Leptostrophiidae]
- Magnomma, Lu and Qian 1983 [Ptychopariida]
- Magnosia [Arbaciidae]
- Mahaiella, Yin 1983 [Proetida]
- Mahoningoceras [Nautilida]
- Maiandrocyathus [Archaeocyathida]
- Maiaspis, Chernysheva 1956 [Ptychopariida]
- Maichelina [Foraminifera]
- Maikottaphyllum, Lavrusevich 1968 [Kyphophyllidae]
- Maikottia, Lavrusevich 1967 [Tryplasmatidae]
- Maioteuthis [Teuthida]
- Maishucunconus [Helcionellidae]
- Maitaia [Atomodesmatidae]
- Maizassionis [Palaeocopida]
- Maja, Lamarck 1801 [Crustacea]
- Majiangia, Lu and Qian 1983 [Corynexochida]
- Majiaobaphyllum [Anthozoa]
- Majiashanella [Ostracoda]
- Majkopella [Diplospirellidae]
- Majoceras [Intejocerida]
- Majungaella [Podocopida]
- Makaira, Lacépède 1802 [Scombridae]
- Makarakia [Mollusca]
- Makarskiana [Foraminifera]
- Makiyama [Poecilosclerida]
- Maklaya [Neoschwagerinidae]
- Makridinirhynchia [Tetrarhynchiidae]
- Malacocottus, Bean 1890 [Scorpaeniformes]
- Malacopygaeus, Leriche 1906 [Perciformes]
- Maladia, Rose 1983 [Eurekiidae]
- Maladioidella, Endo 1937 [Idahoiidae]
- Maladioides, Kobayashi 1933 [Elviniidae]
- Malagastrigonia [Trigoniida]
- Malaiocrinus, Wanner 1924 [Cladida]
- Malayanoplia [Anopliidae]
- Malayites, O. Welter 1914 [Juvavitidae]
- Malayomaorica, Jeletzky 1963 [Buchiidae]
- Malchiblastus [Spiraculata]
- Maldeotaia, Singh and Shukla 1981 [Protoconodonta]
- Malea, Valenciennes 1833 [Tonnidae]
- Malerosteus, Kulczycki 1957 [Arthrodira]
- Malguzaria [Palaeocopida]
- Maligneocrinus, Laudon 1952 [Monobathrida]
- Malinaspis, Andreeva 1985 [Ptychopariida]
- Malinowskiella [Demospongea]
- Malladaia, Oehlert 1896 [Phacopida]
- Malladaites [Hammatoceratidae]
- Mallagnostus, Howell 1935 [Weymouthiidae]
- Malleia [Bouchardiidae]
- Malletia, des Moulins 1832 [Malletiidae]
- Malletophychites [Ptychitidae]
- Malloproductus [Sentosiidae]
- Mallotus, Cuvier 1829 [Actinopterygii]
- Malluvium, Melvill 1906 [Hipponicidae]
- Malnina [Palaeocopida]
- Malongella, Chang 1974 [Archaeocopida]
- Malongullia, Webby and Moors 1970 [Raphiophoridae]
- Maltoniceras [Cardioceratidae]
- Malumispongium [Lyssacinosida]
- Malungia, Lu 1961 [Dolerolenidae]
- Malurostrophia [Douvillinidae]
- Malvinella, Wolart 1968 [Calmoniidae]
- Malvufundus, de Gregorio 1885 [Malleidae]
- Malykania, Suvorova 1958 [Jakutidae]
- Malykanotheca [Orthothecida]
- Mamayocaris [Mysidacea]
- Mambrinia, Gardner 1939 [Cassidae]
- Mametothyris, Smirnova 1969 [Mametothyrididae]
- Mamiconus [Neogastropoda]
- Mamillodus [Problematica]
- Mamillopora [Mamilloporidae]
- Mammilla, Schumacher 1817 [Naticidae]
- Mammites, Laube and Bruder 1887 [Acanthoceratidae]
- Mammoides [Palaeocopida]
- Mamutinetes [Chonetidae]
- Manacyathus [Cribricyathea]
- Manaia [Glycymerididae]
- Manambolites, Hourcq 1949 [Sphenodiscidae]
- Manatus, Brunnich 1772 [Trichechinae]
- Manawatawhia, Powell 1937 [Rissoidae]
- Manchuriella, Resser and Endo 1935 [Proasaphiscidae]
- Manchurocephalus, Endo 1944 [Ptychopariida]
- Manchuroceras, Ozaki 1927 [Manchuroceratidae]
- Mancikellia [Cardiida]
- Mancosiceras [Cephalopoda]
- Mandaloceras, Hyatt in Zittel 1900 [Mandaloceratidae]
- Mandawacythere [Podocopida]
- Mandelstamia [Podocopida]
- Mandjina [Foraminifera]
- Mandocythere [Podocopida]
- Mandolina, Jousseaume 1884 [Cypraeidae]
- Mandorovella [Hauerinidae]
- Mangeroceras, Sturgeon et al. 1982 [Wiedeyoceratidae]
- Mangiliella [Neogastropoda]
- Mangkeluia [Carinatinidae]
- Manicina, Ehrenberg 1834 [Faviidae]
- Manicrinus, Frest and Strimple 1978 [Cladida]
- Manillocrinus, Campbell and Bein 1971 [Monobathrida]
- Manipora, Sinclair 1955 [Favositidae]
- Manitoulinoceras, A. F. Foerste 1924 [Valcouroceratidae]
- Manitouoceras, Ulrich et al. 1944 [Proterocameroceratidae]
- Manjoceras [Discosorida]
- Manlietta, Wade 1935 [Perleidiformes]
- Mannopyge, Ludvigsen 1987 [Proetidae]
- Mannosocmia [Ostracoda]
- Mannschreckia [Trilobita]
- Manoloviceras [Cephalopoda]
- Manorella [Foraminifera]
- Manosia, Zeng 1983 [Articulata]
- Mansina [Strophomenidae]
- Mansuyella, Endo 1937 [Asaphida]
- Mansuyia, Sun 1924 [Kaolishaniidae]
- Mansuyphyllum, Fontaine 1961 [Cyathophyllidae]
- Manta, Bancroft 1829 [Myliobatidae]
- Mantelliana, Anderson 1966 [Cyprididae]
- Mantellina, Sacco 1904 [Limidae]
- Manticoceras, Hyatt 1884 [Gephuroceratidae]
- Manticrinus, Ausich 1986 [Monobathrida]
- Mantikosocrinus, Strimple 1951 [Cladida]
- Manulicula, J. Kríž 1967 [Praecardiidae]
- Manupecten [Pectinidae]
- Manzanella, Girty 1909 [Manzanellidae]
- Manzonella [Cheilostomata]
- Manzonia, Brusina 1870 [Rissoidae]
- Maoricardium [Cardiida]
- Maoricolpus, Finlay 1926 [Turritellidae]
- Maoricrypta, Finlay 1926 [Calyptraeidae]
- Maoricrypta (Zeacrypta), Finlay 1926 [Calyptraeidae]
- Maorimactra, Finlay 1928 [Mactridae]
- Maorimonotis [Pterioida]
- Maoriscaphander, Dell 1950 [Cephalaspida]
- Maoristrophia [Amphistrophiidae]
- Maorithyas, Fleming 1950 [Lucinidae]
- Maoritomella, Powell 1942 [Turridae]
- Maorivetia, Finlay 1924 [Cancellariidae]
- Maotunia, Zhang and Jell 1987 [Proasaphiscidae]
- Mapania, Resser and Endo 1935 [Mapaniidae]
- Mapanopsis, Chang 1963 [Asaphida]
- Maquoketocrinus, Slocom and Foerste 1924 [Diplobathrida]
- Maragnicrinus, Whitfield 1905 [Cladida]
- Marama, Marwick 1927 [Veneridae]
- Marama (Hina), J.A. Marwick 1927 [Veneridae]
- Marathonocrinus, Moore and Plummer 1940 [Cladida]
- Maratia, Kay 1940 [Bolliidae]
- Marbodeia, Chelot 1887 [Acmaeidae]
- Marcharella [Finkelnburgiidae]
- Marchia, Jousseaume 1880 [Muricidae]
- Marcia, H. Adams and A. A 1857 [Veneridae]
- Marckgrafia, Weiler 1935 [Sclerorhynchidae]
- Marcusodictyon, Bassler 1952 [Problematica]
- Marcusodictyon [Ctenostomata]
- Marcusopora [Ctenostomata]
- Mareda, Kobayashi 1942 [Saukiidae]
- Marekolithus, F. C. Shaw 1995 [Trinucleidae]
- Maretia, Gray 1855 [Spatangidae]
- Margachitina [Rhizopodea]
- Margarastraea, Frech 1896 [Montlivaltiidae]
- Margarella [Trochidae]
- Margaretta [Margarettidae]
- Margaritaria [Pholadomyacidae]
- Margaritella, Meek and Hayden 1860 [Architectonicidae]
- Margarites, Gray 1847 [Trochidae]
- Margaritiproductus [Productidae]
- Margaritropites, C. Diener 1916 [Tropitidae]
- Margarobairdia, Kristan-Tollmann 1978 [Bairdiidae]
- Margarophyllia, Volz 1896 [Margarophylliidae]
- Margarosmilia, Volz 1896 [Margarophylliidae]
- Marginara [Foraminifera]
- Marginaria, Röemer 1841 [Calloporidae]
- Marginatia [Productidae]
- Marginella, Lamarck 1799 [Marginellidae]
- Marginella (Volvarina), Hinds 1844 [Marginellidae]
- Margineulima, Cossmann 1888 [Eulimidae]
- Marginia [Palaeocopida]
- Marginicinctus [Productidae]
- Marginirugus [Productidae]
- Marginisulcus [Palaeocopida]
- Marginohealdia [Healdiidae]
- Marginopora [Soritidae]
- Marginoproductus [Productidae]
- Marginorthis [Whittardiidae]
- Marginospongia [Demospongea]
- Marginotimorites [Ostracoda]
- Marginotruncana [Globotruncanidae]
- Marginulina, d'Orbigny 1826 [Nodosariidae]
- Marginulinita [Ichthyolariidae]
- Marginulinopsis [Nodosariidae]
- Margniohealdia [Metacopida]
- Margocrinus [Isocrinida]
- Margoplanitia [Podocopida]
- Margostrea, Vialov 1936 [Ostreidae]
- Marhoumacrinus, Prokop and Petr 1987 [Monobathrida]
- Mariafusus, Petuch 1988 [Fasciolariidae]
- Mariania [Brissidae]
- Mariannaella, Sapelnikov and Rukavischnikova 1975 [Virgianidae]
- Marianoceras, Librovitch 1962 [Reticuloceratidae]
- Marieita [Foraminifera]
- Mariella, Nowak 1916 [Turrilitidae]
- Marimoum, Funakawa 1994 [Lophophaenidae]
- Marinauris [Archaeogastropoda]
- Marinduqueia [Verticillitida]
- Marionites [Heterorthidae]
- Mariothia [Archaeogastropoda]
- Mariottia [Gastropoda]
- Marisastrum, Rozkowska 1965 [Disphyllidae]
- Maritimella, Repina and Okuneva 1969 [Naraoiida]
- Mariusilites, Mironova 1974 [Favositidae]
- Marjumia, Walcott 1916 [Ptychopariida]
- Markitoechia [Uncinulidae]
- Marklandella [Platyorthidae]
- Markocyathus [Archaeocyathida]
- Marlenites [Eunicemorpha]
- Marmarostoma, Swainson 1829 [Turbinidae]
- Marosichthys, Whitely 1951 [Tetraodontiformes]
- Marphysaites [Eunicemorpha]
- Marquetta [Cheilostomata]
- Marquezina [Palaeocopida]
- Marracanthus, St. John and Worthen 1875 [Chimaeriformes]
- Marrella, Walcott 1912 [Arthropoda]
- Marrelomorpha, class [Arthropoda]
- Marrolithoides, Williams 1948 [Trinucleidae]
- Marrolithus, Bancroft 1929 [Trinucleidae]
- Marsaisia, Hupé 1953 [Saukiandidae]
- Marsdenius, Wellburn 1902 [Diplacanthidae]
- Marshallaria, Finlay and Marwick 1937 [Turridae]
- Marshallena, Allan 1926 [Turridae]
- Marshallia, Zittel 1877 [Callodictyonidae]
- Marshallites, Matsumoto 1955 [Kossmaticeratidae]
- Marsipella [Rhabdamminidae]
- Marslatourella [Podocopida]
- Marssonella [Valvulinidae]
- Marssoniella [Cyclostomata]
- Marssonopora, Lang 1914 [Calloporidae]
- Marsupiocrinus, Morris 1843 [Monobathrida]
- Marsupites [Uintacrinida]
- Martesia, G. B. Sowerby 1824 [Pholadidae]
- Martiguesia [Foraminifera]
- Martinechinus [Temnopleuridae]
- Martinezicancer [Decapoda]
- Martinia, M'Coy 1844 [Martiniidae]
- Martinichthys [Crossognathiformes]
- Martinicythere [Podocopida]
- Martiniella [Martiniidae]
- Martinocarcinus, Bohm 1922 [Martinocarcinidae]
- Martinophyllum, Jell and Pedder 1969 [Disphyllidae]
- Martinothyris [Elythidae]
- Martinottiella [Valvulinidae]
- Martinssonia [Arthropoda]
- Martinssonopsis [Palaeocopida]
- Martinssonozona [Palaeocopida]
- Martolites, C. Diener 1916 [Episculitidae]
- Marwickara [Neogastropoda]
- Marwickia, Finlay 1927 [Veneridae]
- Maryonychia, J. Pojeta 1966 [Ambonychiidae]
- Maryvillia, Walcott 1916 [Kingstoniidae]
- Mascarananda [Decapoda]
- Mashania [Medusae]
- Masiaposites [Hourcquiinae]
- Maslinella [Foraminifera]
- Masloviella [Palaeocopida]
- Massilina, Schlumberger 1893 [Hauerinidae]
- Massyla, H. Adams and A. Adams 1854 [Cancellariidae]
- Mastigobolbina, Ulrich and Bassler 1923 [Palaeocopida]
- Mastigocrinus, Bather 1892 [Botryocrinidae]
- Mastigograptus [Graptolithina]
- Mastigophora [Teuthida]
- Mastigophora [Cheilostomata]
- Mastigophorella [Escharinidae]
- Mastoblastus, Yu. A. Arendt et al. 1969 [Fissiculata]
- Mastoceras [Protactinocerida]
- Mastodictya [Reticulosa]
- Mastodictyum [Hexactinosa]
- Mastophorus [Demospongea]
- Mastophyma [Demospongea]
- Mastopora, Sokolov 1952 [Auloporidae]
- Mastosia [Demospongea]
- Matania, Rasetti 1946 [Catillicephalidae]
- Mataninella [Trilobita]
- Matanzia [Foraminifera]
- Matarchia, Boghachev 1942 [Perciformes]
- Mataxa, B. Wade 1916 [Cancellariidae]
- Maternella [Myodocopida]
- Maternoceras, Clausen 1969 [Gephuroceratidae]
- Matheria, Billings 1858 [Cyrtodontidae]
- Matheria [Cardiida]
- Mathericrinus, Webster 1981 [Cladida]
- Matherocladia [Fenestrata]
- Matheronia, Munier-Chalmas 1873 [Requieniidae]
- Matheropora [Fenestrata]
- Mathilda, Semper 1865 [Mathildidae]
- Mathilda (Echinimathilda), Sohl 1960 [Mathildidae]
- Mathoceras, Casey 1963 [Deshayesitidae]
- Mathoceratites [Cephalopoda]
- Matronella [Podocopida]
- Matsumotoa, Okada 1958 [Arcidae]
- Matsutrypa, Gorjunova 1985 [Hyphasmoporidae]
- Mattajacyathus [Ajacicyathida]
- Matthewcyathus [Porifera]
- Mattsechinus [Echinoneoida]
- Matuta, Weber 1795 [Matutidae]
- Matutella, Cooper 1951 [Matutellidae]
- Maudrillia [Neogastropoda]
- Mauispirifer [Acrospiriferidae]
- Mauithoe, Finlay 1930 [Volutidae]
- Maulisia, Parr 1960 [Osmeriformes]
- Maurea, Oliver 1926 [Archaeogastropoda]
- Maurenia, Le Maître 1957 [Cleistoporidae]
- Mauria [Neogastropoda]
- Mauricia [Mytilidae]
- Mauritanaster [Brissidae]
- Mauritsina [Podocopida]
- Maurolicus, Cocco 1838 [Sternoptychidae]
- Maurotarion, Alberti 1969 [Aulacopleuridae]
- Mauryella, Ulrich and Bassler 1923 [Aechminellidae]
- Maustonia, Berg 1953 [Parabolinoididae]
- Maxwellia, Baily 1950 [Muricidae]
- Mayaites [Sphaeroceratidae]
- Mayaothyris, Sun 1987 [Terebratulida]
- Maydenella [Parastrophinidae]
- Mayiella, Chang 1966 [Redlichiida]
- Maylisoria, E. V. Bykova 1961 [Lagynidae]
- Mayncina [Mayncinidae]
- Mazaphyllum, Crook 1955 [Holmophyllidae]
- Mazapilites [Oppeliidae]
- Mazodus [Psammodontidae]
- Mazohydra [Hydroida]
- Mazzalina, Conrad 1860 [Fasciolariidae]
- Mazzettia [Spatangoida]
- Mccloudia [Foraminifera]
- Mcewanella, Foerste 1920 [Platystrophiidae]
- Mclearnia [Pterioida]
- Mclearnites [Amphistrophiidae]
- Mclearnitesella [Amphistrophiidae]
- Mcleodea, Flower and Duncan 1975 [Plasmoporellidae]
- Mcmurdodus [Mcmurdodontidae]
- Mcnamaraspis, Long 1995 [Arthrodira]
- Mcqueenoceras, Ulrich and Foerste 1936 [Proterocameroceratidae]
- Meadowtownella, Pribyl and Vanek 1965 [Odontopleuridae]
- Meandraraea, Etallon 1859 [Haplaraeidae]
- Meandrastrea, d'Orbigny 1849 [Montlivaltiidae]
- Meandrina, Lamarck 1801 [Meandrinidae]
- Meandripetra [Tabulospongida]
- Meandroloculina [Nubeculariidae]
- Meandrophyllia, d'Orbigny 1849 [Haplaraeidae]
- Meandropora [Cyclostomata]
- Meandropsina [Meandropsinidae]
- Meandroria, Alloiteau 1952 [Faviidae]
- Meandrosmilia, Alloiteau 1952 [Meandrinidae]
- Meandrospira [Cornuspiridae]
- Meandrospiranella [Cornuspiridae]
- Meandrospongia [Lychniscosa]
- Meandrostia [Maeandrostiidae]
- Meandrovolzeia, Cuif 1976 [Volzeiidae]
- Mecloudius [Anthozoa]
- Mecochiria [Decapoda]
- Mecochirus, Germar 1827 [Mecochiridae]
- Mecoliotia, Hedley 1899 [Pickworthiidae]
- Mecophrys, Shergold 1982 [Trilobita]
- Mecynoceras, Foerste 1926 [Poterioceratidae]
- Mecynodon [Cardiida]
- Mecynoecia [Entalophoridae]
- Medaeus, J. D. Dana 1851 [Xanthidae]
- Medeela [Radiolitidae]
- Medessia [Anomalorthidae]
- Medianella [Palaeocopida]
- Mediapora [Nikiforovellidae]
- Mediargo, Terry 1968 [Ranellidae]
- Medinophyllum, Sytova 1966 [Entelophyllidae]
- Mediocytherideis [Podocopida]
- Medionapus, Stephenson 1941 [Neogastropoda]
- Mediopsis [Foraminifera]
- Mediospirifer [Spinocyrtiidae]
- Medipsia [Foraminifera]
- Mediraon, Vokes 1946 [Crassatellidae]
- Medisemicoscinium [Fenestrata]
- Mediterraneotrigonia [Trigoniida]
- Mediterranirhynchia [Cyclothyrididae]
- Medlicottia, Waagen 1880 [Medlicottiidae]
- Medocechinus [Temnopleuroida]
- Medocia [Foraminifera]
- Medoriopsis, Cossmann 1888 [Planaxidae]
- Medusae, class [Cnidaria]
- Medusaephyllum, Roemer 1855 [Phillipsastraeidae]
- Medusinites, R. C. Sprigg 1949 [Cyclozoa]
- Medusytes [Medusae]
- Meekella [Meekellidae]
- Meekia, Gabb 1864 [Tancrediidae]
- Meekoceras, A. Hyatt 1879 [Prionitidae]
- Meekopora [Hexagonellidae]
- Meekoporella [Hexagonellidae]
- Meeria, Frederickson 1949 [Asaphida]
- Megabalanus, Hoek 1913 [Balanidae]
- Megacanthopora [Rhabdomesidae]
- Megacardita, Sacco 1899 [Carditidae]
- Megachonetes [Rugosochonetidae]
- Megacidaris [Cidaridae]
- Megacrenella, Habe and Ito 1965 [Crenellidae]
- Megacucullaea, Rennie 1936 [Cucullaeidae]
- Megaderaion [Harrimaniidae]
- Megadiceras [Hippuritida]
- Megadisocosorus, Foerste 1925 [Armenoceratidae]
- Megadunderbergia, Kobayashi 1938 [Ptychopariida]
- Megagraulos, Kobayashi 1935 [Wuaniidae]
- Megagrypha [Bivalvia]
- Megalaspidella, Kobayashi 1937 [Asaphidae]
- Megalaspides, Brögger 1886 [Asaphidae]
- Megalaspidicus, Petrunina 1984 [Trilobita]
- Megalaspis, Angelin 1851 [Asaphidae]
- Megalatractus [Neogastropoda]
- Megalelasma [Porifera]
- Megaliocrinus, Moore and Laudon 1942 [Paragaricocrinidae]
- Megalisania, Qiu 1983 [Corynexochida]
- Megalocardia [Cardiida]
- Megaloceras [Oncocerida]
- Megalograptus [Eurypterida]
- Megalomoidea [Hippuritida]
- Megalomphalus, Brusina 1871 [Vanikoridae]
- Megalopiformes, order [Actinopteri]
- Megaloplax, Obrutschev 1933 [Arthrodira]
- Megalops, Lacépède 1803 [Elopidae]
- Megalopsis, Qian 1983 [Ptychopariida]
- Megalopterorhynchus [Petasmariidae]
- Megalytoceras [Lytoceratidae]
- Megambonia, Hall 1859 [Modiomorphidae]
- Megamyonia, Y. Wang 1949 [Rafinesquinidae]
- Megangulus, Afshar 1969 [Tellinidae]
- Meganterella [Meganterididae]
- Meganteris [Meganterididae]
- Megapalaeolenus, Chang 1966 [Palaeolenidae]
- Megapetalus, Clark 1929 [Asterostomatidae]
- Megaphyllites, E. v. Mojsisovics 1879 [Megaphyllitidae]
- Megapitaria, Grant and Gale 1931 [Veneridae]
- Megaplectatrypa [Karpinskiidae]
- Megapleuronia [Isogrammidae]
- Megapneustes [Brissidae]
- Megapomus [Coelacanthiformes]
- Megapraeconia, Chavan 1952 [Astartidae]
- Megapronorites, Ruzhencev 1949 [Pronoritidae]
- Megarhiza, Schrammen 1901 [Megarhizidae]
- Megasalopina [Draboviidae]
- Megascyliorhinus, Cappetta and Ward 1977 [Parascylliidae]
- Megasphaera [Problematica]
- Megasphaeroceras [Cephalopoda]
- Megaspinochonetes [Strophochonetidae]
- Megasqualus, Herman 1982 [Squalidae]
- Megastomella [Foraminifera]
- Megastomia [Pyramidellidae]
- Megastroma [Axinellida]
- Megastrophiella [Douvillinidae]
- Megastylia [Reticulosa]
- Megasurcula [Turridae]
- Megatebennus, Pilsbry 1890 [Fissurellidae]
- Megateuthis, Bayle 1878 [Belemnitida]
- Megathura, Pilsbry 1890 [Fissurellidae]
- Megatrigonia [Trigoniida]
- Megatyloceras [Cephalopoda]
- Megaxinus, Brugnone 1880 [Lucinidae]
- Megayoldia, Verrill and Bush 1897 [Sareptidae]
- Megerlina, Deslongchamps 1884 [Kraussinidae]
- Meghystrichosphaeridium [Problematica]
- Meginoceras, F. H. McLearn 1930 [Trachyceratidae]
- Megistaspis, Jaanusson 1956 [Asaphidae]
- Megistocrinus, D. D. Owen and B. F. Shumard 1852 [Batocrinidae]
- Megistolepis [Coelacanthiformes]
- Megistostoma, Gabb 1864 [Cephalaspida]
- Megommatocythere [Podocopida]
- Megousia, Muir-Wood and Cooper 1960 [Linoproductidae]
- Megumatrypa [Atrypidae]
- Mehesella [Podocopida]
- Mehlina, Youngquist 1945 [Polygnathidae]
- Meidamonella [Foraminifera]
- Meidiichthys, Brough 1931 [Perleididae]
- Meifodia [Lissatrypidae]
- Meikeloceras [Ellesmerocerida]
- Meiocardia, H. Adams and A. A 1857 [Glossidae]
- Meioceras, Carpenter 1858 [Caecidae]
- Meisenia [Cardiida]
- Meishucunella, Jiang 1982 [Archaeocopida]
- Meisterella, Ivshin 1952 [Trilobita]
- Meitanoceras [Actinocerida]
- Meitanopora, Yang 1973 [Gorskyitidae]
- Mekynophrys, Harrington 1938 [Asaphidae]
- Melagathiceras, E. T. Tozer 1971 [Melagathiceratidae]
- Melagraphia [Trochidae]
- Melamphaes, Guenther 1864 [Beryciformes]
- Melanatria, Bowdich 1822 [Pachychilidae]
- Melanchlenia [Palaeocopida]
- Melanella, Bowdich 1822 [Eulimidae]
- Melanioptyxis [Heterostrophia]
- Melanofurcata [Cnidaria]
- Melanognathus, Jarvik 1967 [Dipnomorpha]
- Melanogrammus, Gill 1862 [Gadidae]
- Melanonus, Guenther 1878 [Gadiformes]
- Melanophyllidium, Kropacheva 1966 [Kiziliidae]
- Melanophyllum, Gorskiy 1951 [Cyathopsidae]
- Melanoraphia [Phyllodocemorpha]
- Melanosteus [Cnidaria]
- Melanosteus, Lelievre and Goujet 1987 [Selenosteidae]
- Melanostrophus [Stolonoidea]
- Melanostylus [Cnidaria]
- Melapium, H. Adams and A. A 1853 [Strepturidae]
- Melathrokerion [Foraminifera]
- Melatolla [Foraminifera]
- Melatoma [Neogastropoda]
- Melaxinaea, Iredale 1930 [Glycymerididae]
- Melbacrinus, Strimple 1939 [Bridgerocrinidae]
- Melchiorites, Spath 1923 [Desmoceratidae]
- Meleagrinella, Whitfield 1855 [Oxytomidae]
- Melicerita [Cyclostomata]
- Melicerita [Cellariidae]
- Meliceritella [Cyclostomata]
- Meliceritites [Cheilostomata]
- Melita, Leach 1814 [Amphipoda]
- Melithaea [Gorgonacea]
- Melittosphaera [Spumellaria]
- Melkanicyathus [Monocyathida]
- Mellita, Agassiz 1841 [Mellitidae]
- Melliteryx, Iredale 1924 [Erycinidae]
- Meloceras [Oncocerida]
- Melocrinites, G.A. Goldfuss 1831 [Monobathrida]
- Melonanchora [Poecilosclerida]
- Melonechinus [Palaechinidae]
- Melonella, Zittel 1878 [Cylindrophymatidae]
- Melongena, Schumacher 1817 [Melongenidae]
- Melongena (Heligmotoma), Mayer-Eymar 1895 [Galeodidae]
- Melonis, Monfort 1808 [Nonionidae]
- Melonites, Bogoslovsky 1971 [Prolobitidae]
- Melopetasus [Problematica]
- Melosia, Dall 1915 [Veneridae]
- Melrosia, Wright 1966 [Stringophyllidae]
- Membranacyathus [Ajacicyathida]
- Membranipora, Blainville 1834 [Electrinidae]
- Membraniporella [Cribrilinidae]
- Membraniporidra, Canu and Bassler 1917 [Calloporidae]
- Membraniporina [Electrinidae]
- Membrendoecium [Antroporidae]
- Memoria [Podocopida]
- Menabites, Collignon 1948 [Collignoniceratidae]
- Menabonites [Pachydiscidae]
- Menaspacanthus, Patterson 1965 [Chondrichthyes]
- Mendacella, Cooper 1930 [Rhipidomellidae]
- Mendathyris [Meganterididae]
- Mendolaspis, Rusconi 1951 [Raphiophoridae]
- Mendosina, Shergold 1975 [Remopleurididae]
- Mendospidella, Rusconi 1952 [Corynexochida]
- Mene, Lacépède 1803 [Menidae]
- Meneghinella, Boernemann 1891 [Trilobita]
- Meneghiniceras [Juraphyllitidae]
- Menestho, Möller 1842 [Pyramidellidae]
- Meneviella, Stubblefield 1951 [Holocephalinidae]
- Menidia, Bonaparte 1836 [Atheriniformes]
- Menippe, De Haan 1833 [Oziidae]
- Meniscoceras, Flower 1941 [Proterocameroceratidae]
- Meniscocorphye [Ptychopariida]
- Meniscophyllum, Simpson 1900 [Hapsiphyllidae]
- Meniscopora [Cheilostomata]
- Meniscuchus, Opik 1975 [Agnostida]
- Menneraspis, Pokrovskaya 1959 [Menneraspidae]
- Mennerella [Beyrichiopsidae]
- Mennericyathus [Ajacicyathida]
- Menneroctenia [Nuculida]
- Mennespirifer [Cyrtospiriferidae]
- Menniscocrinus [Cladida]
- Menocephalites, Kobayashi 1935 [Ptychopariida]
- Menocidaris [Cidaroida]
- Menoeidina [Metacopida]
- Menomonia, Walcott 1916 [Menomoniidae]
- Menophyllum, Milne-Edwards and Haime 1850 [Cyathopsidae]
- Menticirrhus, Gill 1861 [Perciformes]
- Mentzeliopsis [Sinucostidae]
- Menuites, Spath 1922 [Pachydiscidae]
- Menuthiaster [Holasteroida]
- Menuthionautilus, Collignon 1933 [Grypoceratidae]
- Menuthionautlis (Collignon 1933) [Nautilida]
- Meoma, Gray 1851 [Brissidae]
- Meonia [Chlidonophoridae]
- Meotolima, Oyama 1943 [Limidae]
- Merabatis, Cappetta 1983 [Myliobatiformes]
- Mercaticeras [Hildoceratidae]
- Mercenaria, Schumacher 1817 [Veneridae]
- Mercierella, Fauvel 1923 [Serpulidae]
- Mercimonia, Dall 1902 [Veneridae]
- Merebolina, Gandl 1980 [Proetida]
- Merelina, Iredale 1915 [Rissoidae]
- Meretrissa [Cardiida]
- Meretrix, Lamarck 1799 [Veneridae]
- Mericella [Neogastropoda]
- Mericoceras [Orthocerida]
- Merignacia [Cardiida]
- Meringaspis, Opik 1967 [Damesellidae]
- Meringosoma [Amphinomorpha]
- Merismopteria [Pterioida]
- Merista, Suess 1851 [Meristidae]
- Meristella [Meristellidae]
- Meristelloides [Meristellidae]
- Meristina, Hall 1867 [Meristellidae]
- Meristocrinus, Springer 1909 [Sagenocrinitidae]
- Meristorygma [Brachythyrididae]
- Meristoschisma [Parablastoidea]
- Meristosomo [Arthropoda]
- Meristospira [Athyrididae]
- Merklinia, Sobetski 1960 [Pectinidae]
- Merklinicardium [Cardiida]
- Merlangius, Geoffroy 1767 [Pisces]
- Merlewoodia, Pickett 1967 [Aphrophyllidae]
- Merlia [Tabulospongida]
- Merlingina [Foraminifera]
- Merlinia, Fortey and Owens 1987 [Asaphidae]
- Merluccius, Rafinesque 1810 [Merlucciidae]
- Merocanites, Schindewolf 1922 [Prolecanitidae]
- Merocidaris [Psychocidaridae]
- Merocrinus, Walcott 1884 [Cladida]
- Merocythere [Podocopida]
- Meroena, Jukes-Brown 1908 [Veneridae]
- Meropalla, Opik 1967 [Leiostegiidae]
- Meroperix, Lane 1972 [Styginidae]
- Merospirifer [Martiniidae]
- Merostomata, class, Dana 1852 [Prosomapoda]
- Merostomoidea, class [Arthropoda]
- Merriamaster [Dendrasteridae]
- Merriamia, Boulanger 1904 [Toretocnemidae]
- Merrillina [Ozarkodinida]
- Merulina, Ehrenberg 1834 [Merulinidae]
- Mesaktoceras [Actinocerida]
- Mesalia, Gray 1847 [Turritellidae]
- Mesammina [Hemisphaeramminidae]
- Meschedea [Spumellaria]
- Mesenteripora, de Blainville 1830 [Entalophoridae]
- Mesetaia, Hupe 1953 [Ptychopariida]
- Mesiteia, Gorjanovic-Kramberger 1885 [Orectolobiformes]
- Mesnaquaceras, Flower 1955 [Proteoceratidae]
- Mesoblastus, R. Etheridge and P. H. Carpenter 1886 [Granatocrinidae]
- Mesocallista, Cox 1952 [Veneridae]
- Mesoceras, Barrande 1877 [Mesoceratidae]
- Mesochasmoceras, Foord 1900 [Trigonoceratidae]
- Mesochilotoma [Neogastropoda]
- Mesochione [Cardiida]
- Mesochiton [Neoloricata]
- Mesocladiscites, A. A. Shevyrev 1968 [Cladiscitidae]
- Mesoclupea [Ichthyodectiformes]
- Mesoconularia [Scyphozoa]
- Mesocrania, Smirnova 1997 [Craniidae]
- Mesocystis [Diploporita]
- Mesodentalina [Ichthyolariidae]
- Mesodesma, Deshayes [Mesodesmatidae]
- Mesodiadema [Cidaroida]
- Mesodiadema [Diadematidae]
- Mesodiceras [Hippuritida]
- Mesodmodus [Hybodontiformes]
- Mesodouvillina, Williams 1950 [Amphistrophiidae]
- Mesodromilites, Woodward 1900 [Decapoda]
- Mesoendothyra, Dain 1958 [Mesoendothyridae]
- Mesofavosites, Sokolov 1951 [Favositidae]
- Mesogalathea, Housa 1963 [Galatheidae]
- Mesogaudryceras, Spath 1927 [Gaudryceratidae]
- Mesogena [Archaeogastropoda]
- Mesoglauconia, Mennessier 1984 [Cassiopidae]
- Mesohalina, Wittibschlager 1983 [Potamididae]
- Mesohibolites [Belemnitida]
- Mesokylix [Hydroida]
- Mesolasma [Cirripedia]
- Mesolepis, Young 1866 [Actinopterygii]
- Mesoleptostrophia, Harper and Boucot 1978 [Leptostrophiidae]
- Mesolimulus [Xiphosurida]
- Mesolinga, Chavan 1951 [Lucinidae]
- Mesolissostrophia [Eopholidostrophiidae]
- Mesolites, Mironova 1969 [Favositidae]
- Mesolophodus [Chondrichthyes]
- Mesomiltha, Chavan 1938 [Lucinidae]
- Mesomorpha, Pratz 1883 [Curtoseriidae]
- Mesomphalus, Ulrich and Bassler 1913 [Beyrichiidae]
- Mesonea [Tubuliporidae]
- Mesoneilo, Vu-khuc 1977 [Ctenodontidae]
- Mesoneritina, Yen 1946 [Neritidae]
- Mesonomia, Ulrich and Cooper 1936 [Huenellidae]
- Mesonopora [Plagioeciidae]
- Mesopeplum, Iredale 1929 [Pectinidae]
- Mesopholidostrophia, Williams 1950 [Eopholidostrophiidae]
- Mesophyllum, Schlüter 1889 [Digonophyllidae]
- Mesophyllum (Cystiphylloides), Chapman 1893 [Cystiphyllidae]
- Mesophyllum (Dialytophyllum), Amanshauser 1925 [Digonophyllidae]
- Mesophyllum (Hemicosmophyllum), Wedekind and Vollbrecht 1931 [Digonophyllidae]
- Mesophyllum (Lekanophyllum), Wedekind 1923 [Digonophyllidae]
- Mesophyllum (Zonodigonophyllum), Vollbrecht 1926 [Digonophyllidae]
- Mesopleura [Solecurtidae]
- Mesoplica [Productidae]
- Mesopuzosia, Matsumoto 1954 [Desmoceratidae]
- Mesorbitolina [Orbitolinidae]
- Mesorhoea, Stimpson 1871 [Parthenopidae]
- Mesorhytis [Mitridae]
- Mesosaccella, Chavan 1946 [Nuculanidae]
- Mesoscalpellum [Cirripedia]
- Mesoschubertella, Kanuma and Sakagami 1957 [Schubertellidae]
- Mesosimoceras [Simoceratidae]
- Mesosolenia, Mironova 1960 [Multisoleniidae]
- Mesospira, Cossmann 1892 [Pseudomelaniidae]
- Mesostomaria [Cheilostomata]
- Mesotaxis [Palmatolepidae]
- Mesoteuthis [Belemnitida]
- Mesotreta [Siphonotretidae]
- Mesotrigonia [Trigoniida]
- Mesotrochactaeon, Akopyan 1972 [Cephalaspida]
- Mesotrypa, Ulrich 1893 [Mesotrypidae]
- Mesotrypina [Trepostomida]
- Mesoturrilites [Turrilitidae]
- Mesovallupus, Pessagno and MacLeod 1987 [Pantanelliidae]
- Mespilocrinus [Sagenocrinida]
- Mespilocystites, Balher 1900 [Coronata]
- Messaoudia [Holasteridae]
- Messinella [Podocopida]
- Mestognathus, Bischoff [Conodontophorida]
- Mesturus [Mesturidae]
- Metabelemnites [Aulacocerida]
- Metablastus, R. Etheridge and P. H. Carpenter 1886 [Spiraculata]
- Metabolipa, Godefroid 1974 [Gypidulidae]
- Metabolocrinus, Jaekel 1902 [Cladida]
- Metabowmania, Kobayashi 1955 [Proetida]
- Metabrograptus [Graptoloidea]
- Metacalymene, Kegel 1927 [Calymenidae]
- Metacanites, Schindewolf 1922 [Prolecanitidae]
- Metacanthina, Pillet 1954 [Acastidae]
- Metacarnites, C. Diener 1908 [Tibetitidae]
- Metacatillocrinus, Moore and Strimple 1942 [Crinoidea]
- Metacerithium, Cossmann 1906 [Metacerithiidae]
- Metaclimacograptus, Bulman and Rickards 1968 [Normalograptidae]
- Metacoceras, Hyatt 1883 [Tainoceratidae]
- Metaconularia [Scyphozoa]
- Metaconulus, Cossmann 1918 [Archaeogastropoda]
- Metacopida, order, Sylvester-Bradley 1961 [Ostracoda]
- Metacrinus, Carpenter 1882 [Isocrinidae]
- Metacrocrinus, Moore and Strimple 1969 [Monobathrida]
- Metacromyocrinus, Strimple 1961 [Dendrocrinida]
- Metacryphaeus, Reed 1907 [Calmoniidae]
- Metactinoceras [Actinocerida]
- Metacymbites [Cymbitidae]
- Metacypris, Brady and Robertson 1870 [Limnocytheridae]
- Metacytheropteron [Cytheruridae]
- Metadagnoceras, E. T. Tozer 1965 [Khvalynitidae]
- Metaderoceras, Spath 1925 [Eoderoceratidae]
- Metadictya [Rhinidictyidae]
- Metadimorphoceras, Moore 1958 [Dimorphoceratidae]
- Metadoliolina [Verbeekinidae]
- Metadoxides, Bornemann 1891 [Redlichiida]
- Metaeutelecrinus, Frest and Strimple 1980 [Monobathrida]
- Metaffinocrinus, Knapp 1969 [Cladida]
- Metagraulos, Kobayashi 1935 [Agraulidae]
- Metagravesia [Cephalopoda]
- Metahamites [Cephalopoda]
- Metahedenstroemia, L. F. Spath 1934 [Noritidae]
- Metahoplites [Cephalopoda]
- Metakootenia, Qiu 1983 [Corynexochida]
- Metalaeospira [Serpulimorpha]
- Metaldetes [Archaeocyathida]
- Metalegoceras, Schindewolf 1931 [Metalegoceratidae]
- Metalisania, Ju 1983 [Lisaniidae]
- Metalytoceras, Spath 1927 [Lytoceratidae]
- Metamelon, J.A. Marwick 1926 [Volutidae]
- Metamsassia [Tabulospongida]
- Metanephrops, R. Jenkins 1972 [Nephropidae]
- Metanomocare, Lermontova 1940 [Asaphida]
- Metanothosaurus, Yabe and Shikana 1948 [Nothosauridae]
- Metapadia [Arcida]
- Metapatoceras [Cephalopoda]
- Metapeltoceras [Aspidoceratidae]
- Metaperimestocrinus, Strimple 1961 [Pirasocrinidae]
- Metaphragmoceras, Flower 1938 [Nothoceratidae]
- Metapilekia, Harrington 1938 [Pilekiidae]
- Metaplacenticeras, Spath 1926 [Placenticeratidae]
- Metaplasia [Ambocoeliidae]
- Metapliomerops, Kobayashi 1934 [Phacopida]
- Metapolymorphina [Foraminifera]
- Metaporinus [Disasteridae]
- Metaprioniodus [Conodontophorida]
- Metapronorites, Librovitch 1938 [Pronoritidae]
- Metaptychoceras [Hamitidae]
- Metaredlichia, Lu 1950 [Redlichiidae]
- Metarizoceras, Foerste 1930 [Oncoceratidae]
- Metarmenoceras, Flower 1940 [Ormoceratidae]
- Metarnioceras [Arietitidae]
- Metascutellum, Snajdr 1960 [Styginidae]
- Metasibirites, E. Mojsisovics 1896 [Metasibiritidae]
- Metasigaloceras, Hyatt 1903 [Acanthoceratidae]
- Metaspyroceras, A. A. Foerste 1932 [Dawsonoceratidae]
- Metassuria, L. F. Spath 1934 [unclassified genus]
- Metasterocystis [Diploporita]
- Metastromatoceras, Zhuravleva 1957 [Pseudorthoceratidae]
- Metastyliolina, Boucek and Prantl 1961 [Striatostyliolinidae]
- Metasycocrinus [Cladida]
- Metathyrisina [Retziellidae]
- Metatibetites, Zhao and Wang 1976 [Tibetitidae]
- Metatissotia [Tissotiidae]
- Metavermilia [Serpulimorpha]
- Metaxia, Monterosato 1884 [Triphoridae]
- Metayuepingia, Liu 1977 [Asaphida]
- Metelipora, Trizna 1950 [Crustoporidae]
- Meteoraspis, Resser 1936 [Tricrepicephalidae]
- Metephippiorthoceras, Zhuravleva 1957 [Proteoceratidae]
- Methabocrinus, Jaekel 1918 [Monobathrida]
- Metholectypus, Hawkins 1923 [Holectypidae]
- Metichthyocrinus [Cladida]
- Metinyoites, L. F. Spath 1930 [Inyoitidae]
- Metisaspina [Ptychopariida]
- Metisaspis, Rasetti 1946 [Ptychopariida]
- Metoicoceras, Hyatt 1903 [Acanthoceratidae]
- Metopacanthus, Zittel 1887 [Myriacanthidae]
- Metopotropis, Opik 1967 [Monkaspididae]
- Metorthis [Plaesiomyidae]
- Metoxynoticeras [Oxynoticeratidae]
- Metracolposa [Cribrilinidae]
- Metrarabdotos [Metrarabdotosidae]
- Metrioceras [Discosorida]
- Metriomphalus, Cossmann 1916 [Nododelphinulidae]
- Metrionaxon, Glinski 1963 [Laccophyllidae]
- Metriophyllum, Milne-Edwards and Haime 1850 [Metriophyllidae]
- Metrioplexus, Glinski 1963 [Metriophyllidae]
- Metriorhynchus, H. von Meyer 1830 [Metriorhynchidae]
- Metrocrypta [Cheilostomata]
- Metrolytoceras [Lytoceratidae]
- Metroperiella, Canu and Bassler 1917 [Cheilostomata]
- Metschnikowia [Demospongea]
- Metula, H. Adams and A. Adams 1853 [Buccinidae]
- Metulella, Gabb 1873 [Columbellidae]
- Metussuria, L. F. Spath 1934 [Ussuriidae]
- Metutharocrinus, Moore and Strimple 1973 [Pirasocrinidae]
- Metyacyathellus [Archaeocyathida]
- Mexicaprina, Coogan 1973 [Caprinuloideidae]
- Mexicaspis, Lochman 1948 [Zacanthoididae]
- Mexicella, Lochman 1948 [Ptychopariidae]
- Mexicoceras, Ruzhencev 1955 [Cyclolobidae]
- Mexicotrochactaeon, Akopyan 1972 [Cephalaspida]
- Meyendorffina, Aurouze and Bizon 1958 [Pavonitinidae]
- Meyerella [Decapoda]
- Meyeria, McCoy 1849 [Mecochiridae]
- Mezocrotalus, Maksimova 1978 [Phacopida]
- Mezounia [Aegiromenidae]
- Mialsemia [Erniettamorpha]
- Miamoceras, Flower 1946 [Oncoceratidae]
- Miaohuangrhynchus [Rhynchonellida]
- Miaopopsis, Lu 1965 [Raphiophoridae]
- Miatschkovocrinus [Cladida]
- Micagnostus, Khairullina 1975 [Agnostida]
- Micantapex, Iredale 1936 [Turridae]
- Micatheca [Exilithecida]
- Miccocephalites [Cardioceratidae]
- Micella [Gusarellidae]
- Michaletia, Cossmann 1903 [Trochidae]
- Michalskia [Cephalopoda]
- Michaspis, Egorova and Savitsky 1968 [Ptychopariida]
- Michela, J. A. Gardner 1945 [Turridae]
- Michelinaraea, Alloiteau 1952 [Haplaraeidae]
- Michelinia, de Koninck 1841 [Micheliniidae]
- Michelinoceras, Foerste 1932 [Orthoceratidae]
- Michelottiphyllia, Barta-Calmus 1973 [Merulinidae]
- Michiganites, Ruzhencev 1962 [Prolecanitidae]
- Michniakia, Missarzhevsky 1966 [Helcionelloida]
- Micidus [Meganterididae]
- Mickwitzia, Schmidt 1888 [Mickwitziidae]
- Micmacca, Matthew 1895 [Chengkouiidae]
- Micmaccopsis, Lermontova 1940 [Corynexochida]
- Micrabacia, Milne-Edwards 1849 [Micrabaciidae]
- Micracanthoceras [Himalayitidae]
- Micraclathurella [Neogastropoda]
- Micragnostus, Howell 1935 [Agnostidae]
- Micranellium, Bartsch 1920 [Caecidae]
- Micraseites [Tunicata]
- Micraster, L. Agassiz 1836 [Micrasteridae]
- Micrelenchus [Archaeogastropoda]
- Micreschara, Cossmann 1891 [Planaxidae]
- Microaechmina [Palaeocopida]
- Microancientia [Problematica]
- Microbiplices [Aulacostephanidae]
- Microblastidium, Schrammen 1902 [Callodictyonidae]
- Microblastus, Eykeren 1942 [Phaenoschismatidae]
- Microcallista, Stewart 1930 [Veneridae]
- Microcampylus [Trepostomida]
- Microcapros, Gayet 1980 [Zeiformes]
- Microcaracrinus, Strimple and Watkins 1969 [Pachylocrinidae]
- Microcardinalia, Boucot and Ehlers 1963 [Stricklandiidae]
- Microcardium, Thiele 1934 [Cardiidae]
- Microcaris [Microcarididae]
- Microcheilinella [Pachydomellidae]
- Microchilina [Palaeocopida]
- Microchirus, Bonaparte 1833 [Soleidae]
- Microchlamys, Sobetski 1977 [Pectinidae]
- Microcirce [Cardiida]
- Microcorax, Cappetta and Case 1975 [Lamniformes]
- Microcoryne [Porifera]
- Microcorystes, Fritsch 1893 [Decapoda]
- Microcosmia [Ostracoda]
- Microcrinus, Emmons 1858 [Comatulida]
- Microcubus, Haeckel 1881 [Acanthodesmiidae]
- Microcyathus, Hinde 1896 [Palaeacidae]
- Microcyclus, Meek and Worthen 1868 [Hadrophyllidae]
- Microcyphus [Temnopleuridae]
- Microcyprina [Cardiida]
- Microcythere [Podocopida]
- Microcytherura, Muller 1894 [Cytheridae]
- Microdactylites [Dactylioceratidae]
- Microdactylophora [Eunicemorpha]
- Microdendron, Schrammen 1901 [Astrocladiidae]
- Microderoceras [Eoderoceratidae]
- Microdiadema [Pseudodiadematidae]
- Microdictyon, Bengston et al. 1981 [Onychophora]
- Microdrillia, Casey 1903 [Turridae]
- Microecia [Cyclostomata]
- Microetmopterus, Siverson 1993 [Squaliformes]
- Microfragum, Habe 1951 [Cardiidae]
- Microfulgur [Neogastropoda]
- Microfusus [Nassariidae]
- Microgadus, Gill 1865 [Gadidae]
- Microgaza, Dall 1881 [Trochidae]
- Microhemidiscia, Kling and Reif 1969 [Hemidiscellidae]
- Microlacuna (Wenz 1939) [Neotaenioglossa]
- Microlampas [Oligopygidae]
- Microliotia, Boettger 1902 [Pickworthiidae]
- Micromaia, Bittner 1875 [Majidae]
- Micromeris, Conrad 1866 [Condylocardiidae]
- Micromesistius, Gill 1863 [Gadidae]
- Micromithrax, F. Noetling 1881 [Corystidae]
- Micromphalina, Cossmann 1888 [Vanikoridae]
- Micromphalites [Clydoniceratidae]
- Micromyrus, Casier 1967 [Anguilliformes]
- Micronectes [Pectinidae]
- Micronoceras, Flower 1938 [Brevicoceratidae]
- Microparaparchites [Podocopida]
- Microparia, Hawle and Corda 1847 [Cyclopygidae]
- Micropedina, Cotteau 1866 [Hemicidaroidea]
- Microphyllia, d'Orbigny 1849 [Latomeandridae]
- Microplasma, Dybowski 1873 [Cystiphyllidae]
- Micropneumatocythere [Podocopida]
- Micropora, Eichwald 1860 [Microporidae]
- Microporella, Hincks 1877 [Microporellidae]
- Microporina [Microporidae]
- Micropsalis, Von Meyer 1859 [Palaemonidae]
- Micropsis [Phymosomatidae]
- Micropycnodon, Hibbard and Graffham 1945 [Pycnodontidae]
- Micropylepora, Jiang 1982 [Problematica]
- Microrhizophora [Demospongea]
- Microrhynchia [Rhynchonellidae]
- Microschedia [Problematica]
- Microschiza, Gemmellaro 1876 [Purpurinidae]
- Microsciadiocapsa, Pessagno 1969 [Neosciadiocapsidae]
- Microscutellum, Snajdr 1960 [Styginidae]
- Microsmilia, Koby 1888 [Caryophylliidae]
- Microsolena, Lamouroux 1821 [Microsolenidae]
- Microsphaeridiorhynchus, Sartenaer 1970 [Trigonirhynchiidae]
- Microspongia, Miller and Dyer 1878 [Hindiidae]
- Microstagon, Cossmann 1896 [Ungulinidae]
- Microstelma, Adams 1861 [Rissoidae]
- Microsteus, Gross 1932 [Selenosteidae]
- Microstomus, Schinze 1822 [Pleuronectiformes]
- Microsurcula, Casey 1904 [Neogastropoda]
- Microthyca, Adams 1863 [Vitrinellidae]
- Microtrigonia [Trigoniidae]
- Microtropites, E. v. Mojsisovics 1893 [Tropitidae]
- Microtrypa, Wilson 1945 [Strophomenidae]
- Microtubus [Polychaeta]
- Microvoluta, Angas 1877 [Volutomitridae]
- Microxestolebris [Podocopida]
- Microzarkodina [Ozarkodinida]
- Mictocrinus, Goldring 1923 [Cladida]
- Mictocystis, Etheridge 1908 [Endophyllidae]
- Mictophyllum, Lang and Smith 1939 [Cyathophyllidae]
- Mictosaukia, Shergold 1975 [Saukiidae]
- Mictospirifer [Cyrtiidae]
- Micula, Sytova 1952 [Expressophyllidae]
- Miculiella, Ivanovskiy 1963 [Expressophyllidae]
- Miehlkella [Palaeocopida]
- Migliorinia [Brissidae]
- Migmatophyllum, Pedder 1971 [Entelophyllidae]
- Migros [Foraminifera]
- Miguashaia, Schultze 1973 [Miguashaiidae]
- Mikadotrochus, Lindoholm 1927 [Pleurotomariidae]
- Mikhailovella [Foraminifera]
- Mikhnocyathus [Ajacicyathida]
- Mikhnocyathus [Archaeocyathida]
- Miklukhoceras, Pavlov 1967 [Medlicottiidae]
- Mikrocidari [Cidaroida]
- Milaculum [Palaeoscolecida]
- Milananguilla, Blot 1978 [Milananguillidae]
- Milanovskya, Egorov 1953 [Aechminellidae]
- Milax, Blome 1984 [Eucyrtidiidae]
- Milda, Dall and Bartsch 1904 [Pyramidellidae]
- Miliammellus [Foraminifera]
- Miliammina, Heron Allen and Earland [Ammodiscidae]
- Miliola, Lamarck 1804 [Miliolidae]
- Miliolechina [Miliolechinidae]
- Miliolinella, Wiesner 1931 [Hauerinidae]
- Miliolipora [Milioliporidae]
- Miliospirella [Foraminifera]
- Millepes, Mörch 1852 [Strombidae]
- Millepora [Milleporina]
- Milleporella [Axinellida]
- Milleporidium, Steinmann 1903 [Axinellida]
- Milleporina, order [Hydrozoa]
- Milleratia [Palaeocopida]
- Millerella [Eostaffellidae]
- Millericrinida, order [Crinoidea]
- Millericrinus [Millericrinida]
- Millosevichia [Cephalaspida]
- Milneria, Dall 1871 [Carditidae]
- Milonicystis [Cornuta]
- Milovanovicia, Polsak 1967 [Radiolitidae]
- Miltha (H. Adams and A. Adams 1857) [Lucinidae]
- Milthona, Marwick 1931 [Lucinidae]
- Miltites, E. v. Mojsisovics 1893 [Haloritidae]
- Mimachlamys, Iredale 1929 [Pectinidae]
- Mimagoniatites, Eichenberg 1930 [Mimagoniatitidae]
- Mimella, Cooper 1930 [Plectorthidae]
- Mimetaster [Mimetasterida]
- Mimetasterida, order, Beurlen 1934 [Marrelomorpha]
- Mimeticosia [Hexactinosa]
- Mimia, Gardiner and Bartram 1977 [Palaeonisciformes]
- Mimikonstantia [Thecideidae]
- Mimimitoceras, Korn 1988 [Prionoceratidae]
- Mimograptus [Graptoloidea]
- Mimolychnoceras [Oncocerida]
- Mimosphinctes, Eichenberg 1931 [Mimosphinctidae]
- Minatoa, Flügel 1974 [Durhaminidae]
- Minepharus [Cardiniidae]
- Minervaecystis [Soluta]
- Minervapecten [Pterioida]
- Minetrigonia [Trigoniidae]
- Minganoceras, Foerste 1938 [Valcouroceratidae]
- Miniacina [Homotrematidae]
- Minicephalus, Lochmann and Lu 1960 [Illaenuridae]
- Minicidaris [Cidaroida]
- Minicrinus, Prokop 1970 [Crinoidea]
- Miniprokopia [Dalmanellidae]
- Minispina [Productidae]
- Minitheca [Orthothecida]
- Minithyris, Radulovic 1991 [Terebratulida]
- Miniuva [Foraminifera]
- Minkella, Lochmann and Hu 1959 [Parabolinoididae]
- Minnivola, Iredale 1939 [Pectinidae]
- Minojapanella, Fujimoto and Kanuma 1953 [Schubertellidae]
- Minolia, A. Adams 1860 [Trochidae]
- Minororthis [Dalmanellidae]
- Minouxia [Foraminifera]
- Minuinsella [Redlichiida]
- Minussiella, Bulvanker 1952 [Disphyllidae]
- Minussina, Morozova 1961 [Trepostomida]
- Minutiscala, de Boury 1909 [Epitoniidae]
- Minutostropheodonta [Strophodontidae]
- Minyaichme [Foraminifera]
- Minythyra [Verneuiliidae]
- Mioawateria, P. Vella 1954 [Turridae]
- Miocardiella [Cardiida]
- Miocardiopsis [Cardiida]
- Miocenebra [Neogastropoda]
- Miocidaris (Serpianotiaris), Jeannet 1933 [Miocidaridae]
- Miocytheridea [Podocopida]
- Miodomeris [Cardiida]
- Miodontiscus, Dall 1903 [Carditidae]
- Mioerycina, Kautsky 1939 [Montacutidae]
- Miofractarmilla [Archaeogastropoda]
- Miogryphus, Hertlein and Grant 1944 [Terebratulida]
- Miogypsina, Sacco 1893 [Miogypsinidae]
- Miogypsinita [Foraminifera]
- Miogypsinoides [Foraminifera]
- Miolepidocyclina [Foraminifera]
- Miolyncina, Schilder 1932 [Cypraeidae]
- Miophora [Scleractinia]
- Miopila, Finlay 1926 [Newtoniellidae]
- Mioplax, Bittner 1884 [Chasmocarcinidae]
- Mioporomya [Pholadomyida]
- Miorangia [Cardiida]
- Mioscapophyllia [Scleractinia]
- Miosorites [Soritidae]
- Mirabiloceras, Flower 1955 [Allotrioceratidae]
- Mirabole, Osmolska 1962 [Proetidae]
- Miracrinus [Sagenocrinida]
- Miraculaspis, Romanenko 1967 [Agnostida]
- Miraculum [Palaeocopida]
- Miracythere [Podocopida]
- Miralda, Carpenter 1856 [Pyramidellidae]
- Miranda, Jegorova 1984 [Ptychopariida]
- Miranella, Pokrovskaya 1960 [Corynexochidae]
- Mirapecten, Dall et al. 1938 [Pectinidae]
- Mirascapha, Stewart 1926 [Cephalaspida]
- Miraspis, R. Richter and E. Richter 1917 [Odontopleuridae]
- Miratheca [Problematica]
- Mirechinus [Temnopleuroida]
- Miricardium [Cardiida]
- Miriella [Sachitida]
- Mirifica [Foraminifera]
- Mirifusella [Spiriferidae]
- Mirifusus, Pessagno 1977 [Parvicingulidae]
- Mirilingula, Popov 1983 [Lingulellotretidae]
- Miriproetus, Snajdr 1977 [Tropidocoryphidae]
- Mirisquamea [Lobothyrididae]
- Mirlolaminatus (Wang 1977) [Neotaenioglossa]
- Miroclymenia [Clymeniida]
- Miroelasma [Anthozoa]
- Mirojuvavites, Wang and He 1976 [Haloritidae]
- Mirolacuna, Wenz 1939 [Littorinidae]
- Mirolaminatus, Wang 1977 [Gastropoda]
- Mironovella [Foraminifera]
- Mirorthis [Dalmanellidae]
- Mirosphinctes [Perisphinctidae]
- Mirua [Nassariidae]
- Mirula, Palmer 1942 [Terebridae]
- Miscellanea [Pellatispiridae]
- Miseia [Hippuritida]
- Misikella, Kozur and Mock 1974 [Conodontophorida]
- Misolia [Diplospirellidae]
- Missisquoia, Shaw 1951 [Missisquoiidae]
- Mississippina [Mississippinidae]
- Misteia [Neogastropoda]
- Mistostigma, Berry 1947 [Gastropoda]
- Mitchellaspis, Henningsmoes 1959 [Phacopida]
- Mitchellella [Leptostrophiidae]
- Mithracites, Gould 1859 [Mithracitidae]
- Mitoclema, Ulrich 1882 [Entalophoridae]
- Mitoclemella [Cyclostomata]
- Mitonia, Renz and Alvarez 1979 [Acanthoceratidae]
- Mitorthoceras, Gordon 1960 [Pseudorthoceratidae]
- Mitra, Lamarck 1798 [Mitridae]
- Mitra (Atrimitra), Dall 1918 [Mitridae]
- Mitracalpis, Haeckel 1881 [Plagoniidae]
- Mitraria, Rafinesque 1815 [Mitridae]
- Mitrata, order, Jaekel 1918 [Stylophora]
- Mitratoma [Neogastropoda]
- Mitrax [Decapoda]
- Mitrella, Risso 1826 [Columbellidae]
- Mitrellotaxis [Conodontophorida]
- Mitrelloturris [Neogastropoda]
- Mitreola, Swainson 1833 [Volutidae]
- Mitridomus, N. F. Sohl 1963 [Vexillidae]
- Mitrithara, Hedley 1922 [Turridae]
- Mitrocaprina, Boehm 1895 [Plagioptychidae]
- Mitroceras, Hyatt 1894 [Brevicoceratidae]
- Mitrocrinus [Crinoidea]
- Mitrocystella [Mitrata]
- Mitrocystites [Mitrata]
- Mitrodendron, Quenstedt 1880 [Amphiastreidae]
- Mitrodrillia [Neogastropoda]
- Mitrolumna, Bucquoy et al. 1883 [Turridae]
- Mitromorpha, Carpenter 1865 [Turridae]
- Mitsukurina, Jordan 1898 [Mitsukurinidae]
- Mixoconus [Conodontophorida]
- Mixogonaria [Anthozoa]
- Mixomanticoceras, Becker et al. 1993 [Gephuroceratidae]
- Mixopterus [Eurypterida]
- Mixosaurus, Baur 1887 [Mixosauridae]
- Mixosiphonoceras, Hyatt 1900 [Jovellaniidae]
- Mixtipecten, Marwick 1928 [Pterioida]
- Mixtusdictyon [Stromatoporoidea]
- Miyagipecten, Masuda 1952 [Pectinidae]
- Miyakoceras [Silesitidae]
- Miyakothyris [Dallinidae]
- Mizuhopecten, Masuda 1963 [Pectinidae]
- Mjandymoceras [Discosorida]
- Mjoesina, N. Spjeldnaes 1957 [Glyptomenidae]
- Mnemoceras [Oncocerida]
- Mnestia, H. Adams and A. A 1854 [Scaphandridae]
- Mnestocylichnella, Oppenheim 1896 [Cephalaspida]
- Moapocrinus [Cladida]
- Mobergella, Herdström 1923 [Mobergellidae]
- Mobula, Rafinesque 1810 [Myliobatidae]
- Mochtyella [Eunicemorpha]
- Mockella, Kozur 1971 [Podocopida]
- Modelia [Archaeogastropoda]
- Moderatoproductus [Monticuliferidae]
- Modesta, Cherepnina 1962 [Stauriidae]
- Modiella, Hall 1885 [Kalenteridae]
- Modiodonta [Modiomorphidae]
- Modiolarca, Gray 1843 [Crenellidae]
- Modiolatus [Mytilidae]
- Modiolina [Cardiida]
- Modiolodon, Ulrich 1894 [Modiomorphidae]
- Modiolula, Sacco 1808 [Mytilidae]
- Modiolusia, Yamamoto and Habe 1958 [Mytilidae]
- Modiomorpha, Hall and Whitfield 1869 [Modiomorphidae]
- Modiomorphoida, order, Newell 1969 [Bivalvia]
- Modiomytilus [Mytilida]
- Modocia, Walcott 1924 [Ptychopariida]
- Modulus, Gray 1842 [Modulidae]
- Moeckowia [Palaeocopida]
- Moelleria, Jeffreys 1865 [Turbinidae]
- Moelleritia, Abushik 1958 [Leperditiidae]
- Moenocrinus [Isocrinida]
- Moerella, Fischer 1887 [Tellinidae]
- Moeschia [Postepithyrididae]
- Moesiloculina [Hauerinidae]
- Mogoktella [Huenellidae]
- Mogoliella [Carinatinidae]
- Moierina [Palaeocopida]
- Moira, Agassiz 1872 [Schizasteridae]
- Moiropsis [Schizasteridae]
- Mojczalepas, Dzik 1986 [Turrilepadida]
- Mojczatheca [Circothecida]
- Mojczatrypa [Trepostomida]
- Mojczella [Palaeocopida]
- Mojsisovicsites, Gemmellaro 1904 [Thisbitidae]
- Mojsisovicsteuthis [Aulacocerida]
- Mojsvaroceras, Hyatt 1883 [Tainoceratidae]
- Mokattamia [Cardiida]
- Mokotibaster [Toxasteridae]
- Mola, Linck 1790 [Molidae]
- Molaria [Arthropoda]
- Molengraafia [Auriculospongiidae]
- Mollia, Lamouroux 1821 [Microporidae]
- Mollisonia, Walcott 1912 [Arthropoda]
- Mollocrinus, Wanner 1916 [Cladida]
- Molongella [Dalmanellidae]
- Molongia [Retziellidae]
- Molophyllum [Anthozoa]
- Moltkia [Gorgonacea]
- Molukkana [Pholadomyida]
- Molukkia, Jaworski 1915 [Scleractinia]
- Molva, Lesueur 1819 [Lotidae]
- Monacanthites [Sibiritidae]
- Monachocrinus, Clark 1919 [Isocrinida]
- Monachus, Flemming 1822 [Phocidae]
- Monadoblastus, R. O. Fay 1961 [Spiraculata]
- Monadotoechia [Septalariidae]
- Monalaria, Marwick 1924 [Struthiolariidae]
- Monasterium, Fleming 1973 [Archaeocopida]
- Moncharmontia [Charentiidae]
- Monelasmina [Draboviidae]
- Monetaria, Troschel 1863 [Cypraeidae]
- Monexagnostus, Liu 1982 [Agnostida]
- Mongoceras [Orthocerida]
- Mongoliacus [Problematica]
- Mongoliella [Mongolellidae]
- Mongoliolites, Bondarenko and Minzhin 1977 [Sibiriolitidae]
- Mongoliopsis [Perissothyrididae]
- Mongolirhynchia [Rhynchonellida]
- Mongolitesta [Problematica]
- Mongolitubulus, Missarzhevsky 1977 [Pseudoconodontida]
- Mongolocarpos [Mitrata]
- Mongoloceras, Ruzhencev 1960 [Mongoloceratidae]
- Mongoloclema [Trepostomida]
- Mongolodictya [Cystoporata]
- Mongolodus, Missarzhevsky 1977 [Protoconodonta]
- Mongolorhynx [Hebetoechiidae]
- Mongolosia [Aulostegidae]
- Mongolospira [Mongolospiridae]
- Moniellocrinus, Pidal 1984 [Diplobathrida]
- Monilea, Swainson 1840 [Trochidae]
- Moniliopsis, Conrad 1865 [Neogastropoda]
- Moniliretusa, Sohl 1963 [Cephalaspida]
- Monilispongia, Wu and Xiao 1989 [Craticulariidae]
- Monitilora, Iredale 1930 [Lucinidae]
- Monkaspis, Kobayashi 1935 [Monkaspididae]
- Monnieria [Hippuritida]
- Monobathrida, order, R. C. Moore and L. R. Laudon 1943 [Crinoidea]
- Monoblastus [Spiraculata]
- Monobolina, Salter 1866 [Elkaniidae]
- Monobrachiocrinus, Wanner 1916 [Cladida]
- Monocentris, Schneider 1801 [Beryciformes]
- Monoceratella, Teichert 1937 [Podocopida]
- Monoceratina, Roth 1928 [Bythocytheridae]
- Monoceratopora [Cribrilinidae]
- Monocerina [Cheilostomata]
- Monocheilus, Resser 1937 [Dikelocephalidae]
- Monochirus, Rafinesque 1814 [Pleuronectiformes]
- Monocladodus, Claypole 1893 [Cladoselachidae]
- Monoclimacis [Graptoloidea]
- Monoconvexa, Pel'man 1977 [Obolellida]
- Monocostodus [Conodontophorida]
- Monocuphus, Piette 1876 [Aporrhaidae]
- Monocyathida, order, Okulitch 1943 [Regulares]
- Monocyrtoceras, Foerste 1924 [Armenoceratidae]
- Monodaeus, Guinot 1967 [Xanthidae]
- Monodechella, Stumm 1953 [Proetida]
- Monodentella [Archaeogastropoda]
- Monodesmopora [Cyclostomata]
- Monodiadema [Acrosaleniidae]
- Monodilepas [Archaeogastropoda]
- Monodonta, Lamarck 1799 [Trochidae]
- Monograptus [Monograptidae]
- Monolene, Goode 1881 [Pleuronectiformes]
- Monomerella, Billings 1872 [Trimerellidae]
- Monomitopus, Alcock 1890 [Ophidiiformes]
- Monomuchites, A. E. Wilson 1961 [Proteoceratidae]
- Monomyces, Ehrenberg 1834 [Flabellidae]
- Mononotella, Ulrich and Bassler 1931 [Indianidae]
- Monophyllites, E. v. Mojsisovics 1879 [Ussuritidae]
- Monopleura, Matheron 1842 [Monopleuridae]
- Monopophorus [Neogastropoda]
- Monoporella [Monoporellidae]
- Monopteria [Pterioida]
- Monoptygma, I. Lea 1833 [Neogastropoda]
- Monorakos, Schmidt 1886 [Pterygometopidae]
- Monorthis [Hesperonomiidae]
- Monoschizablastus [Spiraculata]
- Monosera [Nassellaria]
- Monospinites, Vassiljeva and Sayutina 1988 [Chancelloriidae]
- Monosulcatina, Rozova 1963 [Lonchocephalidae]
- Monotaxinoides [Lasiodiscidae]
- Monothyra, Tryon 1862 [Pholadidae]
- Monotiopleura [Palaeocopida]
- Monotis, Bronn 1830 [Monotidae]
- Monotis (Eomonotis), J.A. Grant-Mackie 1978 [Monotidae]
- Monotrypa, Nicholson 1879 [Amplexoporidae]
- Monotrypella [Trepostomida]
- Monsella [Cheilostomata]
- Monsmirabilia [Podocopida]
- Monspeliensina [Foraminifera]
- Monsteraphyllum [Anthozoa]
- Monstrocrinus, W.E. Schmidt 1942 [Diplobathrida]
- Montacuta, Turton 1822 [Montacutidae]
- Montanablastus [Spiraculata]
- Montanaria, Spriesterbach 1909 [Mactromyidae]
- Montanella [Gusarellidae]
- Montastrea (Blainville 1830) [Montastraeidae]
- Montecaris [Archaeostraca]
- Montfortella [Foraminifera]
- Montfortula, Iredale 1915 [Emarginulinae]
- Montia, Gilbert 1973 [Volutidae]
- Monticellaria [Cheilostomata]
- Monticlarella, Wisniewska 1932 [Norellidae]
- Monticulifera [Monticuliferidae]
- Monticuliphyllia [Scleractinia]
- Monticulipora, Dorbigny 1850 [Monticuliporidae]
- Montipora, Blainville 1830 [Acroporidae]
- Montlivaltia, Lamouroux 1821 [Montlivaltiidae]
- Montlivaltia (Plesiomontlivaltia), Alloiteau 1957 [Montlivaltiidae]
- Montsechiana [Foraminifera]
- Montsenetes [Chonetidae]
- Montyoceras, Flower 1941 [Hebetoceratidae]
- Moorea [Podocopida]
- Moorefieldella, Girty 1911 [Trigonirhynchiidae]
- Mooreinella [Foraminifera]
- Moorelina () [Thecidellinidae]
- Mooreocrinus, Wright and Strimple 1945 [Cladida]
- Moorephylloporina [Fenestrata]
- Moorites [Youngiellidae]
- Mooritheca [Orthothecida]
- Moorowipora [Anthozoa]
- Moosina [Podocopida]
- Mootwingeecyathus [Ajacicyathida]
- Mopsea [Gorgonacea]
- Moquellina, Jin et al. 1979 [Cyclothyrididae]
- Moravammina [Foraminifera]
- Moraviaturia [Dyscoliidae]
- Moravilla [Ambocoeliidae]
- Moravocoryphe, Pribyl and Vanek 1978 [Proetida]
- Moravophyllum, Kettnerova 1932 [Cyathophyllidae]
- Moravostrophia [Douvillinidae]
- Moravurus [Xiphosurida]
- Morchellastraea [Scleractinia]
- Morchiella, Thiele 1925 [Rissoidae]
- Morea, Conrad 1860 [Pholidotomidae]
- Moreauoceras, Cullison 1944 [Tarphyceratidae]
- Morenicyathus [Ajacicyathida]
- Moretarva [Trilobita]
- Moretia [Demospongea]
- Moretia [Lychniscosa]
- Moretiella, Breistroffer 1949 [Dactylocalycidae]
- Moretispongia, Breistroffer 1949 [Jereicidae]
- Morganella [Araksalosiidae]
- Morgatia, Hammann 1972 [Dalmanitidae]
- Morinorhynchus, Havlicek 1965 [Chilidiopsidae]
- Morionella, Dall 1909 [Cassidae]
- Morkhovenia [Podocopida]
- Morkhovenicythereis [Podocopida]
- Mormula, Adams 1864 [Pyramidellidae]
- Morocconites, Boucot and McClure 1989 [Phacopida]
- Moronaster, Sanchez Riog 1952 [Asterostomatidae]
- Morone, Mitchill 1814 [Moronidae]
- Morosyringium [Nassellaria]
- Moroteuthis [Teuthida]
- Morozovapora [Fenestrata]
- Morozovella [Foraminifera]
- Morphasmopora [Cheilostomata]
- Morphastrea, d'Orbigny 1850 [Agariciidae]
- Morphoceras [Morphoceratidae]
- Morrisiceras [Tulitidae]
- Morrowcrinus, Moore and Plummer 1937 [Scytalocrinidae]
- Mortensenaster [Spatangoida]
- Mortieria [Demospongea]
- Mortoniceras, Meek 1876 [Brancoceratidae]
- Mortoniceras (Cantabrigites), Spath 1933 [Brancoceratidae]
- Morula, Schumacher 1817 [Muricidae]
- Morum, Röding 1798 [Harpidae]
- Morunella [Neogastropoda]
- Morycastraea, Melnikova 1984 [Pamiroseriidae]
- Mosaeleberis [Podocopida]
- Mosasaurus, Conybeare 1822 [Mosasauridae]
- Mosathoa [Cheilostomata]
- Moschoglossis, R. Goldring 1958 [Proetidae]
- Moscovicrinus, Jaekel 1918 [Cladida]
- Moselopterus [Eurypterida]
- Mosherella [Conodontophorida]
- Moskovia, Sokolov 1950 [Chaetetidae]
- Mosquella [Tetrarhynchiidae]
- Mostlerella [Podocopida]
- Mostlerium, Cheng 1986 [Archocyrtiidae]
- Motina [Arthropoda]
- Moumina [Martiniidae]
- Moundocrinus, Strimple 1939 [Aesiocrinidae]
- Moussonella [Pterioida]
- Moutoniceras [Cephalopoda]
- Moutonithyris [Sellithyrididae]
- Movschovitschia, Kozur 1971 [Glorianellidae]
- Moxomia [Olenidae]
- Moyacanthus [Ctenacanthiformes]
- Moyerella, Nekhoroshev 1956 [Nematotrypidae]
- Moythomasia, Gross 1950 [Palaeonisciformes]
- Mrassiella [Pterioida]
- Mrassocyathus [Ajacicyathida]
- Mrhilaia [Heterostrophia]
- Mstikhinoceras, Shimanskiy 1961 [Ormoceratidae]
- Mstinia [Foraminifera]
- Mstiniella [Foraminifera]
- Muchattocyathus [Ajacicyathida]
- Mucophyllum, Etheridge 1894 [Mucophyllidae]
- Mucrodactylites [Dactylioceratidae]
- Mucronaspis, Destombes 1963 [Dalmanitidae]
- Mucronella [Romancheinidae]
- Mucronina [Nodosariidae]
- Mucrospirifer, Grabau 1931 [Mucrospiriferidae]
- Mucrospiriferinella [Pennospiriferinidae]
- Muellerina, Bassiouni 1965 [Hemicytheridae]
- Muellerithalamia [Minchinellidae]
- Muellerodus [Conodonta]
- Muensterella, Schevill 1950 [Muensterellidae]
- Muensterites, E. Mojsisovics 1893 [Trachyceratidae]
- Mufushanella [Verbeekinidae]
- Muiroceras, Flower 1949 [Rutoceratidae]
- Muirwoodia [Productidae]
- Mulinia, Gray 1837 [Mactridae]
- Mulinoides [Cardiida]
- Mulletia [Pterioida]
- Multicameroceras, Kobayashi 1933 [Plectronoceratidae]
- Multicarinophyllum, Spasskiy 1965 [Amsdenoididae]
- Multicavea [Cyclostomata]
- Multiconus, Ljaschenko 1955 [Multiconidae]
- Multicorhynchia [Triasorhynchiidae]
- Multicostella [Plaesiomyidae]
- Multicrescis [Cyclostomata]
- Multifascigera [Cyclostomata]
- Multifidella [Foraminifera]
- Multigalea [Lichenoporidae]
- Multiloqua, Laubenfels 1955 [Hexactinosa]
- Multioistodus, Cullison 1938 [Conodonta]
- Multiphragma [Trepostomida]
- Multipocula [Demospongea]
- Multiprion [Eunicemorpha]
- Multiptyxis, Pchelintsev 1953 [Nerinellidae]
- Multiridgia [Aegiromenidae]
- Multiseptida [Colaniellidae]
- Multisolenia, Fritz 1937 [Multisoleniidae]
- Multisparsa [Cyclostomata]
- Multispinula, Rowell 1962 [Siphonotretidae]
- Multispirifer [Acrospiriferidae]
- Multispirina [Alveolinidae]
- Multithecopora, Yoh 1927 [Multithecoporidae]
- Multitubigera [Cyclostomata]
- Multivasculatus [Reticulosa]
- Multizonopora [Cyclostomata]
- Mumiella [Cheilostomata]
- Mummaspis [Olenellidae]
- Mundaster [Spatangoida]
- Munditia, Finlay 1926 [Liotiidae]
- Munditiella, Kuroda and Habe 1954 [Turbinidae]
- Mundocephalina, Repina 1958 [Ptychopariida]
- Munida, W. Leach 1820 [Galatheidae]
- Munidopsis, J. F. Whiteaves 1874 [Munidopsidae]
- Munieratrypa [Punctatrypidae]
- Muniericeras [Muniericeratidae]
- Munijia [Ptychopariida]
- Munitheites, Lorenthey 1929 [Galatheidae]
- Mupus, Cocco 1833 [Centrolophidae]
- Muraena, C. Linnaeus 1758 [Anguilliformes]
- Muraenesox, Mclelland 1843 [Muraenesocidae]
- Murania, Kazmierczak 1974 [Milleporellidae]
- Murchisonella, Mörch 1875 [Ebalidae]
- Murchisoniceras [Orthocerida]
- Murciella [Rhapydioninidae]
- Murengoloclema [Fenestrata]
- Murex, Linnaeus 1758 [Muricidae]
- Murex (Ceratostoma), Hermannsen 1846 [Muricidae]
- Murex (Subpterynotus), Olsson and Harbison 1953 [Muricidae]
- Murexiella, Clench and Farfante 1945 [Muricidae]
- Murexiella (Subpterynotus), Olsson and Harbison 1953 [Muricidae]
- Murexsul, Iredale 1915 [Muricidae]
- Murgeina [Nautiloculinidae]
- Murgella [Soritidae]
- Murguithalamia [Verticillitida]
- Muricanthus, Swainson 1840 [Muricidae]
- Muricassis [Metazoa]
- Muricoglobigerina [Foraminifera]
- Muricopsis, Bucquoy et al. 1882 [Muricidae]
- Muricotrochus, Cossmann 1918 [Proconulidae]
- Muriferella [Draboviidae]
- Murinella, Cooper 1956 [Strophomenidae]
- Murinopsia [Cheilostomata]
- Murjukiana [Hesperonomiidae]
- Murmur, Whitley 1951 [Arthrodira]
- Muroserpula [Serpulimorpha]
- Murotriton [Muricidae]
- Murphyphyllum [Anthozoa]
- Murravechinus [Echinoidea]
- Murravia [Cancellothyrididae]
- Murrayina [Podocopida]
- Murrayinella [Glabratellidae]
- Murrayoceras, Foerste 1926 [Sactorthoceratidae]
- Murrindalaspis, Long 1984 [Acanthothoraci]
- Mursia, Leach 1823 [Calappidae]
- Mursiopsis, Ristori 1889 [Calappidae]
- Murthya [Podocopida]
- Murtiella [Palaeocopida]
- Musashia [Volutidae]
- Muscochitina [Rhizopodea]
- Musculiopsis [Cardiida]
- Musculista, Yamamoto and Habe 1958 [Mytilidae]
- Musicrinus, Donovan 1985 [Myelodactylidae]
- Mussa, Oken 1815 [Mussidae]
- Mustelus [Carchariidae]
- Mutationella [Meganterididae]
- Mutiella, Stoliczka 1871 [Lucinidae]
- Mutilus [Podocopida]
- Mya, Linnaeus 1758 [Myidae]
- Myadesma [Cardiida]
- Myadora, Gray 1840 [Myochamidae]
- Myadoropsis [Pholadomyida]
- Myagropora [Cheilostomata]
- Myagrostoma [Archaeogastropoda]
- Myalinopterella [Pterioida]
- Myapalmula [Mytilida]
- Mycedium, Oken 1815 [Merulinidae]
- Mycetaraea, Pratz 1882 [Microsolenidae]
- Mycetophyllia, Milne-Edwards and Haime 1848 [Mussidae]
- Mycetophylliopsis, Oppenheim 1930 [Montlivaltiidae]
- Mychostomina, Berthelin 1881 [Planispirillinidae]
- Mycocrinus, Schultze 1866 [Crinoidea]
- Myctophiformes, order, Regan 1911 [Actinopteri]
- Myctophum, Rafinesque 1810 [Myctophidae]
- Myeinocystites [Soluta]
- Myelastrum, Haeckel 1887 [Myelastridae]
- Myelodactylus, Hall 1852 [Crinoidea]
- Myinda, Stubblefield and Bulman 1927 [Trinucleidae]
- Myindella, Hutchison and Ingham 1962 [Trinucleidae]
- Myliobatiformes, order, Compagno 1973 [Chondrichthyes]
- Myliobatis, Cuvier 1816 [Myliobatidae]
- Myliusia, Gray 1859 [Euretidae]
- Myllita, d'Orbigny 1850 [Erycinidae]
- Myllitella, Finlay 1926 [Erycinidae]
- Myllocercion, Foreman 1968 [Carpocaniidae]
- Mylloconotreta, Williams and Curry 1985 [Torynelasmatidae]
- Myloceras [Discosorida]
- Mylostoma, Newberry 1883 [Mylostomidae]
- Myobarbum, N. F. Sohl 1963 [Volutidae]
- Myochama, Stutchbury 1830 [Myochamidae]
- Myoconcha, J. de C. Sowerby 1824 [Kalenteridae]
- Myodakryotus [Arcida]
- Myodocopida, order, Sars 1866 [Ostracoda]
- Myoforceps [Mytilidae]
- Myofossa [Sanguinolitidae]
- Myoida, order, Goldfuss 1820 [Bivalvia]
- Myomphalis [Palaeocopida]
- Myopholas, Douvillé 1908 [Ceratomyidae]
- Myophorella, Bayle 1878 [Myophorellidae]
- Myophoria, Bronn 1834 [Myophoriidae]
- Myophoricardium, Wöhrmann 1889 [Myophoricardiidae]
- Myophorigonia [Trigoniidae]
- Myophoriopis, Wöhrmann 1889 [Myophoricardiidae]
- Myoplusia, Neumayr 1884 [Malletiidae]
- Myoproetus, Snajdr 1976 [Proetidae]
- Myopsolenus, Hupe 1952 [Ellipsocephalidae]
- Myoscolex [Radiodonta]
- Myotreta, Goryansky 1969 [Ephippelasmatidae]
- Myra, Leach 1817 [Leucosiidae]
- Myrakeena [Ostreidae]
- Myrene [Neomiodontidae]
- Myriapora [Myriaporidae]
- Myriastiches [Lepidocentridae]
- Myriophyllia, d'Orbigny 1849 [Faviidae]
- Myriophyllum, Cuif 1975 [Conophyllidae]
- Myrioporina [Axinellida]
- Myriospirifer [Cyrtiidae]
- Myriozoum [Cheilostomata]
- Myripristis, Cuvier 1827 [Holocentridae]
- Myristica [Melongenidae]
- Myrmecidium, Vinassa de Regny 1901 [Sestrostomellidae]
- Myrmeciophytum, Schrammen 1910 [Siphoniidae]
- Myrmecomimus, Opik 1979 [Ptychagnostidae]
- Myrmirhynx, Havlicek 1982 [Trigonirhynchiidae]
- Myroconger, Guenther 1879 [Anguilliformes]
- Myrsopsis [Cardiida]
- Myrtea, Turton 1822 [Lucinidae]
- Myrteopsis, Sacco 1901 [Lucinidae]
- Myrtillocrinus, Sandberger 1856 [Cladida]
- Mysella, Angas 1877 [Montacutidae]
- Mysia, Lamarck 1818 [Petricolina]
- Mysidacea, order [Malacostraca]
- Mysidae, family [Mysidacea]
- Mysidiella [Mytilida]
- Mysidoptera [Pterioida]
- Mysterioceras, Teichert and Glenister 1953 [Mysterioceratidae]
- Mysterium [Hexactinosa]
- Mysticoceras, Ulrich and Foerste 1936 [Proterocameroceratidae]
- Mysticocrinus [Sagenocrinida]
- Mystriophis, Kaup 1856 [Anguilliformes]
- Mystriopora [Cheilostomata]
- Mystrocephala, Whittington 1960 [Brachymetopidae]
- Mystrophora [Mystrophoridae]
- Mytella, Soot-Ryen 1955 [Mytilidae]
- Mytilaster [Mytilidae]
- Mytilisepta [Mytilidae]
- Mytiloceramus [Pterioida]
- Mytiloida, order, Rafinesque 1815 [Bivalvia]
- Mytiloides, Brongniart 1822 [Inoceramidae]
- Mytiloperna [Malleidae]
- Mytilops [Mytilida]
- Mytilus, Linnaeus 1758 [Mytilidae]
- Myttonia, Whittard 1955 [Trinucleidae]
- Myurella, Hinds 1844 [Terebridae]
- Myxilla [Poecilosclerida]
- Myxiniformes, order [Myxini]
- Myzostomaria, class [Annelida]
- Naanchangasaurus [Ichthyopterygia]
- Nabarredia [Strophochonetidae]
- Nabiaoia [Aegiromenidae]
- Nacca, Risso 1826 [Naticidae]
- Nacella, Schumacher 1817 [Nacellidae]
- Nacocrinus, Webster and Olson 1998 [Cladida]
- Nactocrinus [Cladida]
- Nadalina, Narbonne and Hofmann 1987 [Medusae]
- Nadiyella, Romanenko 1988 [Asaphida]
- Nadotia, Tsyganko 1974 [Stauriidae]
- Naedyceras, Hyatt 1884 [Brevicoceratidae]
- Naefia, Wetzel 1930 [Sepiida]
- Naefiteuthididae, family [Boletzkida]
- Naevhithis [Palaeocopida]
- Nagaoella, Hayami 1965 [Veneridae]
- Nagaproetus, Snajdr 1977 [Tropidocoryphidae]
- Nagatoella [Fusulinoidea]
- Nagatophyllum, Ozawa 1925 [Aulophyllidae]
- Nahannagnostus, Pratt 1992 [Diplagnostidae]
- Nahannia, Chatterton and Ludvigsen 1976 [Asaphidae]
- Nahanniaspis [Pteraspidomorphes]
- Nahannicephalus, Pratt 1992 [Llanoaspididae]
- Nahecaris [Archaeostraca]
- Nairiella, Hacobjan 1969 [Turritellidae]
- Naivs [Orthocerida]
- Najaceras [Endocerida]
- Najadospirifer, Havlicek 1957 [Elythynidae]
- Najdinothyris [Terebratulida]
- Nakanotrigonia [Trigoniida]
- Nakazatothyris [Reticulariidae]
- Nalivkinaria [Hebetoechiidae]
- Nalivkinella, Soshkina 1939 [Laccophyllidae]
- Nalivkinia [Atrypinidae]
- Nalivkinicyathus [Ajacicyathida]
- Namaia [Podocopida]
- Namanoia, Lermontova 1951 [Namanoiidae]
- Nambeetella, Legg 1976 [Ptychopariida]
- Namnetia [Juliidae]
- Nanacythere [Podocopida]
- Nanambonites, Liu 1976 [Plectambonitidae]
- Nanaochlamys [Pectinidae]
- Nanatrypa [Glassiidae]
- Nanchangosaurus, Wang 1959 [Hupehsuchia]
- Nanchengella, Huo 1956 [Archaeocopida]
- Nanggulania, Martin 1914 [Neritopsidae]
- Nanicella [Loeblichiidae]
- Nanicrinus, Frest and Strimple 1980 [Monobathrida]
- Nanillaenus, Jaanusson 1954 [Illaenidae]
- Nankinella, Lee 1933 [Staffellidae]
- Nankinolithus, Lu 1957 [Trinucleidae]
- Nanlingella, Rui and Sheng 1981 [Schubertellidae]
- Nanlingella, Xiong and Wang 1980 [Bakevelliidae]
- Nanlingia, Wei and Zhou 1983 [Asaphida]
- Nannamoria, Iredale 1929 [Volutidae]
- Nannastacus [Cumacea]
- Nannites, E. v. Mojsisovics 1897 [Nannitidae]
- Nanno, Clarke 1894 [Endoceratidae]
- Nannobelus [Belemnitida]
- Nannoblastus, J. Wanner 1924 [Codasteridae]
- Nannocardioceras [Cardioceratidae]
- Nannoconus [Nannoconaceae]
- Nannolepis [Peltopleuridae]
- Nannolytoceras [Lytoceratidae]
- Nannopora [Cheilostomata]
- Nannopterygius, Huene 1923 [Ophthalmosauridae]
- Nannopyrgula, Youluo 1978 [Hydrobiidae]
- Nannostephanus [Cephalopoda]
- Nannovascoceras, Renz and Alvarez 1979 [Vascoceratidae]
- Nannubasa [Archaeogastropoda]
- Nanocarpus [Cornuta]
- Nanocrinus, Mueller 1856 [Cladida]
- Nanograptus [Graptoloidea]
- Nanogyra, Beurlen 1958 [Gryphaeidae]
- Nanonavis, Stewart 1930 [Parallelodontidae]
- Nanopitar, Rehder 1943 [Veneridae]
- Nanospira [Lissatrypidae]
- Nanothyris [Centronellidae]
- Nansenia, Jordan and Evermann 1896 [Argentinidae]
- Nanshanophyllum, Yü 1956 [Entelophyllidae]
- Nantanella [Stenoscismatidae]
- Nanukidium, Jones 1979 [Pentameridae]
- Nanurocythereis [Podocopida]
- Naoides, Pickett 1967 [Aphrophyllidae]
- Naos, Lang 1926 [Arachnophyllidae]
- Napaeana, Laubenfels 1955 [Ventriculitidae]
- Napora, Pessagno 1977 [Ultranaporidae]
- Naptile [Arthropoda]
- Napulus, L. W. Stephenson 1941 [Turbinellidae]
- Naquetia, Jousseaume 1880 [Muricidae]
- Naradanithyris [Terebratulida]
- Naraoia, Walcott 1912 [Nektaspida]
- Naraoiida, order [Trilobita]
- Narayania [Foraminifera]
- Narcine, Henle 1834 [Narcinidae]
- Naricava, Hedley 1913 [Tornidae]
- Naricopsina [Ampullinidae]
- Narindechinus [Phymosomatidae]
- Narona, H. Adams and A. Adams 1854 [Cancellariidae]
- Narthecoceras, Hyatt 1895 [Narthecoceratidae]
- Narynella, Andreeva 1987 [Nisusiidae]
- Nasepia [Erniettamorpha]
- Naso, Lacépède 1802 [Acanthuridae]
- Nasonirhynchia, Havlicek 1992 [Trigonirhynchiidae]
- Nassa, Röding 1798 [Buccinidae]
- Nassaria, Link 1807 [Nassariidae]
- Nassarina, Dall 1889 [Columbellidae]
- Nassarina (Zanassarina), Pilsbry and Lowe 1932 [Columbellidae]
- Nassarius, Duméril 1806 [Nassariidae]
- Nassauoceras, Miller 1932 [Tetragonoceratidae]
- Nassellaria, order, Ehrenberg 1875 [Radiolaria]
- Nassicola, Finlay 1924 [Buccinidae]
- Nassovia, Howell 1937 [Ptychopariida]
- Nassoviocrinus, Jaekel 1918 [Cladida]
- Nataliella, Sytova 1966 [Ketophyllidae]
- Natalina, Romanenko 1978 [Hebediscidae]
- Natalophyllum, Radugin 1938 [Alveolitidae]
- Nathorstella [Pterioida]
- Nathorsthia [Merostomoidea]
- Nathorstites, Boehm 1903 [Nathorstitidae]
- Natica, Scopoli 1777 [Naticidae]
- Natica (Carinacca) (Marwick 1924) [Naticidae]
- Natica (Pliconacca), Cossmann and Martin 1914 [Naticidae]
- Natitaria (Koken 1892) [Neritidae]
- Natlandia, David 1946 [Salmoniformes]
- Natmus, Jell 1985 [Ptychopariida]
- Naukat [Naukatidae]
- Naukatoidea, superfamily, Popov and Tikhonov 1990 [Naukatida]
- Naulia [Cardiida]
- Naupliella [Foraminifera]
- Naustia, Ludvigsen 1982 [Remopleurididae]
- Nautellipsites [Muensteroceratidae]
- Nautilida, order, Agassiz 1847 [Cephalopoda]
- Nautiloceras [Nautilida]
- Nautiloculina, Mohler 1938 [Nautiloculinidae]
- Navarella [Foraminifera]
- Navarracythere [Podocopida]
- Navicularina [Ostracoda]
- Naviculina [Podocopida]
- Navispira [Anoplothecidae]
- Navoites [Anthozoa]
- Nawnites [Polychaeta]
- Nayadina, Munier-Chalmas 1864 [Malleidae]
- Nayunnella [Yunnanellidae]
- Nazarovella, De Wever and Caridroit 1984 [Ormistonellidae]
- Neaeromya, Gabe 1873 [Lasaeidae]
- Neaeroporomya, Cossmann 1886 [Poromyidae]
- Neaguites [Miliolidae]
- Neamphitomaria, Bandel 1988 [Amphitomariidae]
- Neancyloceras, Spath 1926 [Diplomoceratidae]
- Neanthias, Steindachner 1880 [Perciformes]
- Neatrypa [Atrypidae]
- Neaxon, Kullmann 1965 [Laccophyllidae]
- Neaxonella, Weyer 1978 [Laccophyllidae]
- Nebenothyris [Elythidae]
- Nebespecha [Nassellaria]
- Nebidella, Rasetti 1972 [Redlichiida]
- Nebraskacrinus, Moore 1939 [Blothrocrinidae]
- Nebraskites [Acanthoceratidae]
- Nebris, Cuvier and Valenciennes 1830 [Perciformes]
- Nebrius, Rüppell 1837 [Ginglymostomatidae]
- Nebroceras [Orthocerida]
- Nebrodites [Simoceratidae]
- Nebularia, Swainson 1840 [Mitridae]
- Neckajatia [Palaeocopida]
- Neckajella [Palaeocopida]
- Necklania [Antipleuridae]
- Necrateria [Podocopida]
- Necrogammarus [Pterygotidae]
- Necronectes, A. Milne-Edwards 1881 [Portunidae]
- Necroteuthis [Teuthida]
- Neepaliphyllum [Anthozoa]
- Neeyambaspis [Pteraspidomorphi]
- Nefocoenia, Oppenheim 1930 [Faviidae]
- Nefophyllia, Wells 1937 [Meandrinidae]
- Negaprion, Whitley 1940 [Carcharhinidae]
- Negebites, A. Parnes 1962 [Hungaritidae]
- Negevodus, Mazin 1986 [Placodontia]
- Negramithyris [Muirwoodellidae]
- Nehanniaspis, Fritz 1972 [Trilobita]
- Nehdentomis [Myodocopida]
- Neilo, Adams 1854 [Malletiidae]
- Neiloides [Nuculida]
- Neimongolella [Rhynchonellida]
- Neithea, Drouet 1825 [Pectinidae]
- Neithella [Pterioida]
- Neitheops, Stewart 1930 [Pterioida]
- Nekewis, Stewart 1927 [Neogastropoda]
- Nekhoroshevia, Bublichenko 1956 [Trigonirhynchiidae]
- Nekhoroshoviella [Trepostomida]
- Nekvasilovela [Laqueidae]
- Nekvasilovella [Articulata]
- Neliella [Cheilostomata]
- Nellia, Busk 1852 [Quadricellariidae]
- Nelltia, L. W. Stephenson 1953 [Tellinidae]
- Neltneria, Hupe 1952 [Neltneriidae]
- Nelumbia [Demospongea]
- Nelumbifolium, Wu 1990 [Cribrospongiidae]
- Nemacanthclema [Cryptostomata]
- Nemagraptus [Graptoloidea]
- Nemaster, Clark [Comatulida]
- Nemataxidra [Fenestrata]
- Nemataxis [Cryptostomata]
- Nematifera [Cyclostomata]
- Nematinion, Hinde [Demospongea]
- Nematoda, phylum, Potts 1932 [Nematoidea]
- Nematonotus, Woodward 1899 [Aulopidae]
- Nematopora, Ulrich 1888 [Arthrostylidae]
- Nematoporella [Cheilostomata]
- Nematoptychius, Traquair 1875 [Palaeoniscidae]
- Nematosalpinx [Aphrosalpingidae]
- Nemesa [Septalariidae]
- Nemetia [Cardiida]
- Nemistium, Smith 1928 [Lithostrotionidae]
- Nemocardium, Meek 1876 [Cardiidae]
- Nemocardium (Lyrocardium) (Meek 1876) [Cardiidae]
- Nemoceratina [Podocopida]
- Nemodon, Conrad 1869 [Parallelodontidae]
- Nemuniella [Palaeocopida]
- Neoacarinina [Foraminifera]
- Neoacrocephalites [Ptychopariida]
- Neoagnostus, Kobayashi 1955 [Agnostidae]
- Neoalbaillella, Takemura and Nakaseko 1981 [Albaillellidae]
- Neoanomocerella [Ptychopariida]
- Neoaparchites [Palaeocopida]
- Neoarchaediscus [Archaediscidae]
- Neoarchaeocrinus, Strimple 1955 [Diplobathrida]
- Neoarchaesphaera [Foraminifera]
- Neoaspongophyllum [Anthozoa]
- Neobactrotheca [Orthothecida]
- Neobairdia [Podocopida]
- Neobeatricea, Rukhin 1938 [Actinodictyidae]
- Neobelemnella [Belemnitida]
- Neobelinuropsis [Xiphosurida]
- Neobernaya, Schilder 1927 [Cypraeidae]
- Neoberounella [Podocopida]
- Neobeyrichia [Palaeocopida]
- Neobibolites [Cephalopoda]
- Neobistrialites [Nautilida]
- Neobothriocidaris [Bothriocidaroida]
- Neobouchardia [Bouchardiidae]
- Neobrachyelasma, Nikolaeva 1960 [Streptelasmatidae]
- Neobrunsiina [Foraminifera]
- Neobulimina [Foraminifera]
- Neoburmesia [Pholadomyidae]
- Neobythites, Goode and Bean 1885 [Brotulidae]
- Neocaeniopsis, Alloiteau 1957 [Pachyphyllidae]
- Neocamtocrinus [Monobathrida]
- Neocantrilla [Anthozoa]
- Neocaprina, Plenicar 1961 [Caprinulidae]
- Neocardioceras [Acanthoceratidae]
- Neocarpenteria [Foraminifera]
- Neocassandra, Daniltshenko 1968 [Neoscopelidae]
- Neocatacrinus, Knapp 1969 [Cladida]
- Neocatillocrinus, Wanner 1937 [Crinoidea]
- Neocatopygus [Pliolampadidae]
- Neocaudites, Puri 1960 [Trachyleberididae]
- Neocavitella [Conodontophorida]
- Neoceras [Oncocerida]
- Neochetoceras [Oppeliidae]
- Neochilina [Amphissitidae]
- Neochilonorria, Rusconi 1953 [Corynexochida]
- Neochonetes, Muir-Wood 1962 [Rugosochonetidae]
- Neocirpa [Rhynchonellidae]
- Neocladiscites, Y. N. Popov 1961 [Cladiscitidae]
- Neoclavulina [Foraminifera]
- Neoclissiophyllum [Anthozoa]
- Neocobboldia, Rasetti 1952 [Calodiscidae]
- Neocoelia [Athyridida]
- Neocoenia, Hackemesser 1936 [Placocoeniidae]
- Neocola [Buccinidae]
- Neocoleodus [Conodontophorida]
- Neocolumbites, Y. Zacharov 1968 [Columbitidae]
- Neocolumnaria, Soshkina 1949 [Neocolumnariidae]
- Neocomites, Uhlig 1905 [Neocomitidae]
- Neoconularia [Conulariidae]
- Neocosmoceras [Neocomitidae]
- Neocramatia [Eocramatiidae]
- Neocrania, Lee and Brunton 1986 [Craniidae]
- Neocraspedites, Spath 1923 [Polyptychitidae]
- Neocrassina, Fischer 1887 [Astartidae]
- Neocraterellina [Podocopida]
- Neocribrella [Foraminifera]
- Neocrioceras [Diplomoceratidae]
- Neocucullograptus [Graptoloidea]
- Neocybium, Leriche 1906 [Scombridae]
- Neocycloceras, Flower and Caster 1935 [Pseudorthoceratidae]
- Neocylindrites [Cephalaspida]
- Neocylindrus [Olividae]
- Neocypricardinia, Liu 1976 [Permophoridae]
- Neocyprideis [Podocopida]
- Neocyrtolites [Cyrtolitidae]
- Neocystiphyllum, Wedekind 1927 [Lykophyllidae]
- Neocythere [Podocopida]
- Neocytheretta [Podocopida]
- Neodadocrinus [Millericrinida]
- Neodelthyris [Hysterolitidae]
- Neodexiospira [Serpulimorpha]
- Neodicellograptus [Graptoloidea]
- Neodichocrinus, Wanner 1937 [Monobathrida]
- Neodimorphoceras, Schmidt 1925 [Neodimorphoceratidae]
- Neodiplograptus [Graptoloidea]
- Neodiscocyclina [Foraminifera]
- Neodiscosorus [Discosorida]
- Neodiversograptus [Graptoloidea]
- Neodrepanella, Zaspelova 1952 [Drepanellidae]
- Neoeponides, Reiss 1960 [Discorbidae]
- Neoflabellina [Foraminifera]
- Neofletcheriella, Lin 1975 [Fletcheriellidae]
- Neofusulina [Foraminifera]
- Neofusulinella, Deprat 1912 [Schubertellidae]
- Neogaimardia, Odhner 1924 [Gaimardiidae]
- Neogastroplites [Hoplitidae]
- Neogastropoda, order, Thiele 1929 [Gastropoda]
- Neogauthiericeras [Collignoniceratidae]
- Neogeoceras, Ruzhencev 1947 [Medlicottiidae]
- Neoglaphyrites, Ruzhencev 1938 [Bisatoceratidae]
- Neoglobator [Holectypoida]
- Neoglobithyris [Rhipidiothyrididae]
- Neogloboquadrina [Globorotaliidae]
- Neoglyphioceras, Brüning 1923 [Neoglyphioceratidae]
- Neoglytoxoceras [Cephalopoda]
- Neognathodus [Conodontophorida]
- Neogondolella [Ozarkodinida]
- Neogoniatites, Ruzhencev and Bogoslovskaya 1970 [Goniatitidae]
- Neogothograptus [Retiolitidae]
- Neoguadalupia, Zhang 1987 [Colospongiidae]
- Neoguraleus, Powell 1939 [Turridae]
- Neogyroidina [Foraminifera]
- Neohalecopsis, Weiler 1928 [Gonorhynchiformes]
- Neoharpoceras [Brancoceratidae]
- Neohedinaspis, Xiang and Zhang 1984 [Ptychopariida]
- Neohibolites [Belemnitida]
- Neohindia [Demospongea]
- Neohoploceras, Spath 1939 [Neocomitidae]
- Neoicoceras, Hyatt 1900 [Neoicoceratidae]
- Neoimbricaria, Ihering 1907 [Volutomitridae]
- Neoinoceramus, Ihering 1902 [Inoceramidae]
- Neoiraqia [Foraminifera]
- Neoisorophusella, Kammer et al. 1987 [Agelacrinitidae]
- Neojanacus, Suter 1907 [Capulidae]
- Neokaipingoceras, Obata 1940 [Cephalopoda]
- Neokarpinskia [Karpinskiidae]
- Neokeyserlingophyllum [Anthozoa]
- Neokjaerina [Leptostrophiidae]
- Neokloedenella [Palaeocopida]
- Neokoninckophyllum, Fomichev 1939 [Aulophyllidae]
- Neokunmingella, Chang 1974 [Archaeocopida]
- Neokyphophyllum, Spasskiy 1965 [Kyphophyllidae]
- Neolageniocrinus, Arendt 1970 [Cladida]
- Neolatirus, Bellardi 1884 [Fasciolariidae]
- Neolenticulina [Foraminifera]
- Neolepas, Newman [Scalpellidae]
- Neolepton, Monterosato 1875 [Neoleptonidae]
- Neolimulus [Planaterga]
- Neolioceratoides [Hildoceratidae]
- Neoliothyrina [Sellithyrididae]
- Neolissoceras, Spath 1923 [Haploceratidae]
- Neolobites, Fisher 1882 [Engonoceratidae]
- Neolobograptus [Graptoloidea]
- Neoloculicyathus [Archaeocyathida]
- Neololigosepia [Teuthida]
- Neoloricata, order, Bergenhayn 1955 [Polyplacophora]
- Neomantelliceras [Cephalopoda]
- Neomanticoceras, Schindewolf 1936 [Gephuroceratidae]
- Neomegalodon, Guembel 1864 [Megalodontidae]
- Neometabolipa, Godefroid 1974 [Gypidulidae]
- Neometacanthus, Richter 1984 [Acastidae]
- Neomicroceras [Echioceratidae]
- Neomicrorbis [Serpulimorpha]
- Neomiodon [Neomiodontidae]
- Neomiodonoides [Cardiida]
- Neomisellina [Foraminifera]
- Neomonoceratina, Kingma 1948 [Podocopida]
- Neomorphoceras [Cephalopoda]
- Neomorphotis [Heteropectinidae]
- Neomphyma, Soshkina 1937 [Ptenophyllidae]
- Neomultioistodus [Conodontophorida]
- Neomultithecopora, Lin 1963 [Multithecoporidae]
- Neonerinea [Heterostrophia]
- Neonesidea, Maddocks 1962 [Podocopida]
- Neontolium [Pterioida]
- Neonyhamnella [Podocopida]
- Neooctonaria [Podocopida]
- Neopachycormus [Pachycormiformes]
- Neopagetina, Pokrovskaya 1960 [Hebediscidae]
- Neopaliphyllum, Zheltonogova 1961 [Paliphyllidae]
- Neopanderodus [Conodontophorida]
- Neoparadainella [Foraminifera]
- Neopauxillites [Hyolithida]
- Neopelta [Demospongea]
- Neopeltis, Zhang 1983 [Asaphida]
- Neopericyclus, Popov 1965 [Pericyclidae]
- Neopetalichthys, Liu 1973 [Petalichthyida]
- Neopetrozium [Anthozoa]
- Neopharciceras, Bogoslovsky 1955 [Pharciceratidae]
- Neophlycticeras, Spath 1922 [Lyelliceratidae]
- Neophoca, Gray 1866 [Carnivora]
- Neopholidophoropsis [Pachycormiformes]
- Neophrecythere [Podocopida]
- Neophylloceras, Shimizu 1934 [Phylloceratidae]
- Neopilumnoplax [Decapoda]
- Neoplanorbulinella [Foraminifera]
- Neoplatycephalus, Castelnau 1872 [Scorpaeniformes]
- Neoplatycrinus [Platycrinitidae]
- Neopleurofusia [Neogastropoda]
- Neopopanoceras, L. F. Spath 1951 [Procarnitidae]
- Neoprimitiella [Palaeocopida]
- Neoprobolium, Struve 1985 [Dalmanitidae]
- Neoproetus, Tesch 1923 [Phillipsiidae]
- Neopronorites, Ruzhencev 1936 [Pronoritidae]
- Neoproraster [Spatangoida]
- Neoprotencrinus, Knapp 1969 [Cladida]
- Neoprotrachyceras, L. Krystyn 1978 [Trachyceratidae]
- Neoptychites, Kossmat 1895 [Vascoceratidae]
- Neoptyxis [Heterostrophia]
- Neopulchellia [Forbesiceratidae]
- Neopycnodonta, Stenzel 1971 [Gryphaeidae]
- Neoradiolites, Milovanovic 1935 [Radiolitidae]
- Neorbitolinopsis [Foraminifera]
- Neoredlichia, Saito 1936 [Redlichiida]
- Neoretenoa [Cyclostomata]
- Neoreteporina [Fenestrata]
- Neorhombolepis, Woodward 1888 [Eugnathidae]
- Neorhynchula [Atrypinidae]
- Neoroemeria, Radugin 1938 [Thecostegitidae]
- Neorotalia [Foraminifera]
- Neorthoceras, Shimizu and Obata 1936 [Orthocerida]
- Neosaynoceras [Flickiidae]
- Neoscalpellum, Pilsbry 1907 [Scalpellidae]
- Neoschisma, J. Wanner 1924 [Neoschismatidae]
- Neoschizodus, Giebel 1855 [Myophoriidae]
- Neoschizophoria [Schizophoriidae]
- Neoschmidtella [Palaeocopida]
- Neoschubertella [Foraminifera]
- Neosciadiocapsa, Pessagno 1969 [Neosciadiocapsidae]
- Neoscombrops, Gilchrist 1922 [Perciformes]
- Neoselwynoceras [Cephalopoda]
- Neosemantis, Popofsky 1913 [Plagiacanthidae]
- Neoshirakiella, Sun and Xiang 1979 [Ptychopariida]
- Neoshumardites, Ruzhencev 1936 [Somoholitidae]
- Neosichuanoceras [Orthocerida]
- Neosilesites [Silesitidae]
- Neosimnia, Fischer 1884 [Ovulidae]
- Neosirenites, Y. N. Popov 1961 [Trachyceratidae]
- Neosolenopleurella, Ju 1983 [Ptychopariida]
- Neospathodus [Gondolellidae]
- Neospirifer, Fredericks 1919 [Trigonotretidae]
- Neospirigerina [Atrypinidae]
- Neospongophylloides, Jia 1977 [Endophyllidae]
- Neostaffella [Fusulinoidea]
- Neostlingoceras, Klinger and Kennedy 1978 [Turrilitidae]
- Neostrabops, Caster and Macke 1952 [Strabopidae]
- Neostreptognathodus [Conodontophorida]
- Neostringophylloides [Anthozoa]
- Neostrophia [Camerellidae]
- Neosyringopora, Sokolov 1955 [Gorskyitidae]
- Neosyringostroma, Kazmierczak 1971 [Stromatoporidae]
- Neotabularia, Ivaniya 1968 [Stauriidae]
- Neotaenicephalus, Kobayashi 1955 [Ptychopariida]
- Neotaenioglossa, order, Haller 1882 [Gastropoda]
- Neotapes [Cardiida]
- Neotemnophyllum [Anthozoa]
- Neothecidella [Thecideidae]
- Neothlipsura [Podocopida]
- Neothyris, Douville 1879 [Terebratellidae]
- Neotibetites, Krumbeck 1913 [Tibetitidae]
- Neotrapezium, Habe 1951 [Trapezidae]
- Neotrematopora [Trepostomida]
- Neotreta, Sobolev 1976 [Acrotretidae]
- Neotrigonia, Cossmann 1912 [Trigoniidae]
- Neotrochaetaeon [Cephalaspida]
- Neotryplasma, Kaljo 1957 [Tryplasmatidae]
- Neotsitrella [Palaeocopida]
- Neouddenites, Ruzhencev 1961 [Medlicottiidae]
- Neoulrichia [Beyrichiidae]
- Neouvigenna [Foraminifera]
- Neovallupus, Yang and Pessago 1989 [Pantanelliidae]
- Neoveenia [Podocopida]
- Neovenerella [Cardiida]
- Neovenericor [Cardiida]
- Neovepresiphyllum, Jia 1977 [Spongophyllidae]
- Neovermilia [Serpulimorpha]
- Neowormsipora, Lin and Chow 1977 [Plasmoporellidae]
- Neoyanguania [Productidae]
- Neozaphrentis, Grove 1935 [Hapsiphyllidae]
- Neozeacrinus, Wanner 1937 [Zeacrinitidae]
- Neozeba, Iredale 1915 [unclassified genus]
- Nepasitoechia [Rhynchotetradidae]
- Nepea, Whitehouse 1939 [Nepeidae]
- Nepheliospongia [Demospongea]
- Nephelispongia [Hexactinellida]
- Nephelophyllum, Wu and Zhao 1974 [Kepingophyllidae]
- Nephokirkos [Podocopida]
- Nephranops, Richter 1926 [Phacopidae]
- Nephriticeras, Hyatt 1884 [Nephriticeratidae]
- Nephriticerina, Foerste 1927 [Nephriticeratidae]
- Nephrolepidina [Foraminifera]
- Nephropora [Cheilostomata]
- Nephrops, Leach 1814 [Nephropidae]
- Nephropsis [Nephropidae]
- Nephrosphaera [Hemisphaeramminidae]
- Nephrospyris [Nassellaria]
- Nephthea, Audouin 1826 [Alcyonacea]
- Nephtya [Alcyonacea]
- Nepotilla, Hedley 1918 [Turridae]
- Neptocarcinus, Lorenthey 1898 [Portunidae]
- Neptunea, Röding 1798 [Neptuneidae]
- Neptunoceras, Shimanskiy 1949 [Neptunoceratidae]
- Nereidavus [Eunicemorpha]
- Nereidella [Paurorthidae]
- Nereina [Neritidae]
- Nereocrinus, Wanner 1924 [Cladida]
- Nericia, Westgard 1948 [Ptychopariida]
- Nericiaspis [Ptychopariida]
- Nericodus [Conodontophorida]
- Nerinatica, Olsson 1930 [Naticidae]
- Nerinea, Deshayes 1827 [Nerineidae]
- Nerinella, Sharpe 1849 [Nerinellidae]
- Nerineopsis, Cossmann 1906 [Procerithiidae]
- Nerineoptyxis [Heterostrophia]
- Nerinoides [Nerineidae]
- Nerita, Linnaeus 1758 [Neritidae]
- Nerita (Amphinerita), Martens 1887 [Neritidae]
- Nerita (Theliostyla), Mörch 1852 [Neritidae]
- Neritaria, Koken 1892 [Neritariidae]
- Neritina, Lamarck 1816 [Neritidae]
- Neritoma, Morris 1949 [Neritidae]
- Neritoplica, Oppenheim 1892 [Archaeogastropoda]
- Neritopsis, Grateloup 1832 [Neritopsidae]
- Neritoptyx, Oppenheim 1892 [Neritopsidae]
- Neritra [Cardiida]
- Neritrema, Récluz 1869 [Littorinidae]
- Nerophis, Rafinesque 1810 [Gasterosteiformes]
- Nervolites [Hyolithomorpha]
- Nervophyllum, Vasilyuk 1959 [Aulophyllidae]
- Nervostrophia [Leptostrophiidae]
- Neseuretus, Hicks 1873 [Calymenidae]
- Nesides [Coelacanthiformes]
- Nesobornia [Cardiida]
- Nessariostoma, Broili 1933 [Pseudopetalichthyida]
- Nessariostoma [Placodermi]
- Netastoma [Myoida]
- Netrocytheridea [Podocopida]
- Netschajewia, Licharew 1925 [Permophoridae]
- Netschajewiana [Podocopida]
- Nettastoma, Rafinesque 1810 [Anguilliformes]
- Nettastomella [Myoida]
- Netzkaina [Ostracoda]
- Neuburgella, Kazantseva-Selentseva 1981 [Palaeonisciformes]
- Neumanella [Strophodontidae]
- Neumatoceras, Foerste 1935 [Oncoceratidae]
- Neumayrithyris [Terebratulida]
- Neuquenenitrigonia [Trigoniida]
- Neuqueniceras [Cephalopoda]
- Neurograptus, Elles and Wood 1908 [Graptoloidea]
- Neuropora, Bronn 1825 [Neuroporidae]
- Neuropora [Cyclostomata]
- Neuroporella [Cyclostomata]
- Neusticosaurus (Nopcsa 1928) [Lariosauridae]
- Nevadabolbina [Palaeocopida]
- Nevadaecystis [Cornuta]
- Nevadaphyllum, Stumm 1937 [Streptelasmatidae]
- Nevadella, Raw 1936 [Nevadiidae]
- Nevadocoelia, Bassler 1927 [Anthaspidellidae]
- Nevadocrinus [Sagenocrinida]
- Nevadophyllites [Phylloceratitida]
- Nevadotheca, Malinky 1988 [Hyolithidae]
- Nevenulora, Iredale 1930 [Lucinidae]
- Neverita, Risso 1826 [Naticidae]
- Neverita (Hypterita), Woodring 1957 [Naticidae]
- Nevianopora [Cyclostomata]
- Nevillella [Foraminifera]
- Newaagia, Hertlein 1952 [Terquemiidae]
- Newberria [Stringocephalidae]
- Newboldiceras, Thomel 1972 [Acanthoceratidae]
- Newellia [Demospongea]
- Newellipecten, Ruzicka et al. 1959 [Pectinida]
- Newportopora [Trepostomida]
- Newsomella [Pterioida]
- Newsomites [Pachydomellidae]
- Nexocrinus, Eckert 1984 [Diplobathrida]
- Nezamyslia [Palaeocopida]
- Nezumia, Jordan and Starks 1904 [Macrouridae]
- Nezzazata [Nezzazatidae]
- Nezzazatinella, Darmoian 1976 [Nezzazatidae]
- Nganasanella, Rozova 1963 [Aphelaspididae]
- Niachangella [Proetida]
- Niajuphyllum, Strelnikov 1973 [Kodonophyllidae]
- Nibionia [Calcarea]
- Nicaeotrochus, Barta-Calmus 1973 [Turbinoliidae]
- Nicaisolopha, Vyalov 1936 [Ostreidae]
- Nicania [Cardiida]
- Nicaniella, Chavan 1945 [Astartidae]
- Niceforoceras, Basse 1948 [Collignoniceratidae]
- Nicella [Gorgonacea]
- Nicema, Woodring 1964 [Buccinidae]
- Nicholsonella, Ulrich 1890 [Trepostomida]
- Nicholsoniella, Soshkina 1952 [Laccophyllidae]
- Nicholsonograptus, Boucek and Pribyl 1951 [Graptoloidea]
- Nicklesia, Hyatt 1903 [Pulchelliidae]
- Nicklesopora, Bassler 1952 [Rhabdomesidae]
- Nicolia [Neogastropoda]
- Nicolina [Palaeocopida]
- Nicoloidea, Zeng 1987 [Archaeorthidae]
- Nicolorthis [Productorthidae]
- Nicomedites, Toula 1896 [Beyrichitidae]
- Nicoraella [Conodontophorida]
- Nicosiaella, Conti and Fischer 1981 [Gastropoda]
- Nidarica [Cardiida]
- Nielsenicrinus [Isocrinida]
- Nielsenoceras, Furnish 1966 [Paraceltitidae]
- Nieszkowskia, Schmidt 1881 [Cheiruridae]
- Nigerapana [Neogastropoda]
- Nigericeras, Schneegans 1943 [Acanthoceratidae]
- Nigerinoplica [Productidae]
- Nigeroloxoconcha [Podocopida]
- Niigaella [Stenolaemata]
- Nikatheca [Orthothecida]
- Nikenautilus [Nautilida]
- Nikiforopora [Stenoporidae]
- Nikiforovaena [Adolfiidae]
- Nikiforovella [Nikiforovellidae]
- Nikitinella [Baisalinidae]
- Nikitinella [Podocopida]
- Nikolaevirhynchus [Ancistrorhynchidae]
- Nikolarites [Cambroclavida]
- Nilcgna [Ptychopariida]
- Nileoides, Raymond 1920 [Asaphidae]
- Nileus, Dalman 1827 [Nileidae]
- Nilobia [Cardiida]
- Nimbia [Cyclozoa]
- Nina, Gray 1850 [Littorinidae]
- Ninadiscus, Korobov 1980 [Agnostida]
- Ninaspis, Ivshin 1953 [Trilobita]
- Ninella [Foraminifera]
- Ningbingella [Pugnacidae]
- Ninghuaphyllum [Anthozoa]
- Ningkianolithus, Lu 1954 [Trinucleidae]
- Ningnanophyllum, Lin 1965 [Calostylidae]
- Ningqiangolites, H.F. Chu 1975 [Heliolitidae]
- Ningqiangophyllum, Ge and Yü 1974 [Arachnophyllidae]
- Ningqiangsclerites [Problematica]
- Ninocrinus, Castellana and Manni 1991 [Cyrtocrinida]
- Niobe, Angelin 1851 [Asaphidae]
- Niobides, Harrington and Leanza 1957 [Asaphidae]
- Niobina, Lake 1946 [Asaphidae]
- Niobrara [Crossognathiformes]
- Niobrarateuthis, Miller 1957 [Kelaenidae]
- Nionella [Palaeocopida]
- Niorhynx [Niorhynicidae]
- Nipageroceras [Discosorida]
- Nipponarges, Kaneko 1984 [Lichida]
- Nipponaster [Echinarachniidae]
- Nipponaster [Spatangoida]
- Nipponicorbula [Corbulidae]
- Nipponitella [Schwagerinidae]
- Nipponites [Cephalopoda]
- Nipponithyris, Yabe and Hatai 1934 [Dallinidae]
- Nipponitrigonia [Trigoniidae]
- Nipponocalymene, Kaneko 1985 [Phacopida]
- Nipponolimopsis, Habe 1951 [Limopsidae]
- Nipponomarcia, Ikebe 1941 [Cardiida]
- Nipponophyllum, Sugiyama 1940 [Holmophyllidae]
- Nipponstenopora [Trepostomida]
- Nipteraxis [Heterostrophia]
- Nipterella [Demospongea]
- Nipterocrinus [Sagenocrinida]
- Nisaclis, Nordsieck 1972 [Neotaenioglossa]
- Nisiturris [Heterostrophia]
- Niso, Risso 1826 [Eulimidae]
- Nisostomia [Heterostrophia]
- Nisusia, Walcott 1905 [Nisusiidae]
- Nitanoceras, F. H. McLearn 1937 [Megaphyllitidae]
- Nitidavenus, H. E. Vokes 1939 [Veneridae]
- Nitidella, Swainson 1840 [Columbellidae]
- Nitidittellina [Cardiida]
- Nitidocare, Pribyl and Vanek 1985 [Proetidae]
- Nitidus [Hexactinosa]
- Nitkovicepora [Anthozoa]
- Nitoricornus [Hyolithida]
- Niveria, Jousseaume 1884 [Triviidae]
- Nixonella, Lochman 1944 [Llanoaspididae]
- Nobiliasaphus, Pribyl and Vanek 1965 [Asaphidae]
- Nobilitella [Palaeocopida]
- Nochoroicyathus [Ajacicyathida]
- Nochoroiella, Pel'man 1983 [Obolellida]
- Nocturnellia [Draboviidae]
- Nodaea [Crassumbidae]
- Nodambichilina [Palaeocopida]
- Nodasperodiscus [Archaediscidae]
- Nodella, Zaspelova 1952 [Drepanellidae]
- Nodella [Sentosiidae]
- Nodellum [Foraminifera]
- Nodibeyrichia [Palaeocopida]
- Nodiceps, Suvorova 1959 [Corynexochida]
- Nodilittorina, von Martens 1897 [Littorinidae]
- Nodiocoeloceras [Cephalopoda]
- Nodipecten, Dall 1898 [Pectinidae]
- Noditerebra [Terebridae]
- Nodobacularia [Nubeculariidae]
- Nodobaculariella, Cushman and Hanzawa 1937 [Cornuspiridae]
- Nodoblastus [Spiraculata]
- Nodobolivinella [Foraminifera]
- Nodochernyshinella [Foraminifera]
- Nodocosta, Gross 1940 [Acanthodii]
- Nododelphinula, Cossmann 1916 [Nododelphinulidae]
- Nodogenerina [Foraminifera]
- Nodognathus [Conodontophorida]
- Nodogordiospira [Cornuspiridae]
- Nodoinvolutaria [Ichthyolariidae]
- Nodomorphina [Nodosariidae]
- Nodonchus, White 1961 [Acanthodii]
- Nodonychia [Pterioida]
- Nodophthalmidium, Macfadyen 1939 [Nubeculariidae]
- Nodophthalmocythere [Podocopida]
- Nodophyllum, Kaplan 1971 [Holmophyllidae]
- Nodoprosopon, K. Beurlen 1928 [Nodoprosopidae]
- Nodosageceras, Ruzhencev 1956 [Medlicottiidae]
- Nodosarchaediscus [Foraminifera]
- Nodosarella [Foraminifera]
- Nodosaria, Lamarck 1812 [Lagenidae]
- Nodosinella [Nodosinellidae]
- Nodosinelloides [Geinitzinidae]
- Nodosoclymenia, Czarnocki 1989 [Platyclymeniidae]
- Nodosohoplites [Cephalopoda]
- Nodotetraedra [Pyramispongiidae]
- Nodotibetites, Zhao and Wang 1973 [Tibetitidae]
- Nodulipora, Lindström 1873 [Desmidoporidae]
- Nodulus, Monterosato 1878 [Hydrobiidae]
- Noelaspis, Ludvigsen and Westrop 1989 [Idahoiidae]
- Noetca, Stewart 1926 [Cephalaspida]
- Noetia, Gray 1857 [Noetiidae]
- Noetiella [Arcida]
- Noetlingaster [Stomechinidae]
- Noetlingia [Decapoda]
- Noetlingia [Porambonitidae]
- Noetlingites, A. Hyatt 1900 [Longobarditidae]
- Nogamiconus [Conodonta]
- Nolaniceras [Deshayesitidae]
- Nolfophidion, Schwarzhans 1980 [Ophidiiformes]
- Nomadinis, Opik 1967 [Asaphida]
- Nomismoceras, Foord and Crick 1897 [Nomismoceratidae]
- Nomismoceras (Anthracoceras), Frech 1899 [Nomismoceratidae]
- Nonacteonina (L. W. Stephenson 1941) [Acteonidae]
- Nonion, Monfort 1808 [Nonionidae]
- Nonionella, Cushman 1926 [Nonionidae]
- Nonionelleta [Foraminifera]
- Nonionellina [Foraminifera]
- Nonparactocrinus [Crinoidea]
- Nonsukozona [Palaeocopida]
- Nonurocythereis [Podocopida]
- Nophrecythere [Podocopida]
- Noramya, Casey 1961 [Cucullaeidae]
- Norcottia [Foraminifera]
- Nordastrea [Anthozoa]
- Nordella [Reticulariidae]
- Nordenskjoeldaster [Holasteroida]
- Nordenskjoldia, Wilckens 1910 [Parallelodontidae]
- Nordiceras, Bogoslovsky 1955 [Nordiceratidae]
- Nordiodus [Conodontophorida]
- Nordispirifer [Cyrtospiriferidae]
- Nordophiceras, Y. D. Popov 1961 [Meekoceratidae]
- Nordotoechia [Hebetoechiidae]
- Norina [Trilobita]
- Norinia, Troedsson 1937 [Asaphidae]
- Norites, E. v. Mojsisovics 1869 [Noritidae]
- Normanicythere [Podocopida]
- Normannites [Stephanoceratidae]
- Norochilina [Palaeocopida]
- Norrisella [Archaeogastropoda]
- Norrisia, Bayle 1880 [Archaeogastropoda]
- Northia, Gray 1847 [Buccinidae]
- Nortonechinus [Archaeocidaridae]
- Norwoodella, Resser 1938 [Norwoodiidae]
- Norwoodia, Walcott 1916 [Norwoodiidae]
- Nostoceras, Hyatt 1894 [Nostoceratidae]
- Nostolepis, Pander 1856 [Thelodontidae]
- Nostrocyathus [Porifera]
- Notabilitus [Hyolithida]
- Notacanthus, Bloch 1788 [Anguilliformes]
- Notacirsa, Finlay 1926 [Epitoniidae]
- Notadusta, Schilder 1935 [Cypraeidae]
- Notamia [Cheilostomata]
- Notanoplia, Gill 1950 [Spiriferida]
- Notasaphus, Gregory 1903 [Corynexochida]
- Notesthes, Ogilby 1904 [Scorpaeniformes]
- Nothamusium [Mollusca]
- Nothaphrophyllum, Pickett 1967 [Aphrophyllidae]
- Nothia [Bathysiphonidae]
- Nothocephalites [Macrocephalitidae]
- Nothoceras, Barrande 1856 [Nothoceratidae]
- Nothorthis, Ulrich and Cooper 1938 [Archaeorthidae]
- Nothosaurops, Leidy 1870 [Sauropterygia]
- Nothosaurus, Münster 1834 [Nothosauridae]
- Nothosporadoceras, Bogoslovsky 1971 [Sporadoceratidae]
- Nothostephanus [Cephalopoda]
- Nothozoe [Thylacocephala]
- Nothrites [Eunicemorpha]
- Notidanodon, Jordan and Hannibal 1923 [Hexanchidae]
- Notiobolus [Obolidae]
- Notiochonetes [Chonetidae]
- Notiocrinus, Wanner 1924 [Cladida]
- Notirus, H.J. Finlay 1928 [Cardiida]
- Notoacmea, Iredale 1915 [Lottiidae]
- Notoaphelaspis, Powell et al. 1982 [Asaphida]
- Notobalanus [Cirripedia]
- Notoblastus, I. A. Brown 1941 [Neoschismatidae]
- Notobotula [Mytilida]
- Notocallista, Iredale 1924 [Veneridae]
- Notocaris [Mysidacea]
- Notocarpos [Mitrata]
- Notoceras [Cephalopoda]
- Notochione, Hertlein and Strong 1948 [Veneridae]
- Notochlamy [Pterioida]
- Notocidaris [Ctenocidaridae]
- Notocirrus [Eunicemorpha]
- Notoconorbina [Foraminifera]
- Notocrater, Finlay 1927 [Cocculinidae]
- Notocrinus, Mortenson 1917 [Comatulida]
- Notocyathus, Tenison-Woods 1880 [Caryophylliidae]
- Notocycloceras, Teichert and Glenister 1954 [Protocycloceratidae]
- Notocypraea, Schilder 1927 [Cypraeidae]
- Notocytharella [Neogastropoda]
- Notocythere [Podocopida]
- Notodonax, Feruglio 1935 [Donacidae]
- Notogenota [Neogastropoda]
- Notogoneus, Cope 1885 [Gonorhynchidae]
- Notogrammatodon, Maxwell 1966 [Parallelodontidae]
- Notohaliotis [Archaeogastropoda]
- Notolepis, Dollo 1908 [Aulopiformes]
- Notolimea, Iredale 1924 [Limidae]
- Notolimopsis, Maxwell 1969 [Limopsidae]
- Notoluponia, Schilder 1935 [Cypraeidae]
- Notomella, Cotton 1957 [Emarginulinae]
- Notomithrax, Griffin 1963 [Majidae]
- Notonucula [Nuculida]
- Notopaphia [Cardiida]
- Notoparmella, Johnson 1973 [Spiriferida]
- Notopeltis, Harrington and Leanza 1957 [Asaphidae]
- Notopeplum, Finlay 1927 [Volutidae]
- Notopetalichthys, Woodward 1941 [Petalichthyida]
- Notoplagioecia [Cyclostomata]
- Notoplanulina [Foraminifera]
- Notoplax, H. Adams 1861 [Acanthochitonidae]
- Notoplejona [Volutidae]
- Notopocorystes, McCoy 1849 [Raninidae]
- Notopoides, Henderson 1888 [Raninidae]
- Notopus, De Haan 1841 [Raninidae]
- Notorhynchus, Ayres 1855 [Hexanchidae]
- Notorotalia, Finlay 1939 [Nonionidae]
- Notoscabrotrigonia [Trigoniida]
- Notoscapha [Palaeocopida]
- Notoscaphidia [Finkelnburgiidae]
- Notosceles, Bourne 1922 [Raninidae]
- Notoscopelus, Guenther 1864 [Myctophidae]
- Notoscrobs, Powell 1937 [Barleeidae]
- Notosetia, Iredale 1915 [Turbinidae]
- Notosinister, Finlay 1927 [Triphoridae]
- Notostomus, Milne-Edwards 1881 [Oplophoridae]
- Notostrea, Finlay 1928 [Ostreidae]
- Nototeredo, Bartsch 1923 [Teredinidae]
- Nototrigonia [Trigoniida]
- Nototrivia, Schilder 1932 [Triviidae]
- Notovola [Pterioida]
- Notovoluta, Cotton 1946 [Volutidae]
- Nouria [Foraminifera]
- Novaculaperma [Pterioida]
- Novakella, Whittard 1961 [Cyclopygidae]
- Novakina [Ostracoda]
- Novalesia [Foraminifera]
- Novaspis, Whittington 1941 [Trinucleidae]
- Novathaca [Cardiida]
- Novella [Foraminifera]
- Novellinetes [Strophochonetidae]
- Novichuskia [Anthozoa]
- Noviportia [Palaeocopida]
- Novitatus [Orthothecida]
- Novitella, Bogoyavlenskaya 1984 [Amphiporidae]
- Novobolbina [Palaeocopida]
- Novocypris [Podocopida]
- Novogladites [Palaeocopida]
- Novozemelia, Cherkesova 1973 [Gypidulidae]
- Nowakia, Gurich 1896 [Nowakiidae]
- Nowakites [Pachydiscidae]
- Nozamichthys, Schultze and Bardack 1987 [Palaeonisciformes]
- Nozeba, Iredale 1915 [Iravadiidae]
- Nubecularia [Nubeculariidae]
- Nucella [Muricidae]
- Nucha [Nuchidae]
- Nucia, Dana 1852 [Leucosiidae]
- Nucites [Discosorida]
- Nucleata, Quenstedt 1868 [Nucleatidae]
- Nucleatula [Dielasmatidae]
- Nucleocrinus, T. A. Conrad 1842 [Spiraculata]
- Nucleolina [Podocopida]
- Nucleopsis, Conrad 1865 [Cephalaspida]
- Nucleorhynchia [Triplesiidae]
- Nucleurus, Ramskold 1986 [Encrinuridae]
- Nucula, Lamarck 1799 [Nuculidae]
- Nuculana, Link 1807 [Nuculanidae]
- Nuculavus, Tschernyschev 1943 [Nuculidae]
- Nuculoceras, Bisat 1924 [Cravenoceratidae]
- Nuculoida, order, Dall 1889 [Protobranchia]
- Nuculoidea, Williams and Berger 1916 [Nuculidae]
- Nuculoma, Cossmann 1907 [Nuculidae]
- Nucunella, d'Orbigny 1849 [Limopsidae]
- Nudangarita [Archaeogastropoda]
- Nudarchaediscus [Foraminifera]
- Nudechinus, Clark 1912 [Toxopneustidae]
- Nudista [Palaeocopida]
- Nudivagus [Cerithiidae]
- Nudobrissus [Spatangoida]
- Nudonychocella [Cheilostomata]
- Nudymia [Productellidae]
- Nudymiella [Cryptostomata]
- Nugnecella [Orthida]
- Nuguschella [Verneuiliidae]
- Nuguschia [Podocopida]
- Numella, Iredale 1924 [Ungulinidae]
- Numericoma, Popov 1980 [Ephippelasmatidae]
- Nummicrinus [Sagenocrinida]
- Nummodiscorbis [Foraminifera]
- Nummofallotia [Meandropsinidae]
- Nummoloculina [Hauerinidae]
- Nummotectus [Archaeogastropoda]
- Nummulites, Lamarck 1801 [Nummulitidae]
- Nunnacrinus, Bowsher 1955 [Monobathrida]
- Nuratadictyon [Stromatoporoidea]
- Nurataella [Cyrtiidae]
- Nuria [Anazygidae]
- Nurochonetes [Chonetidae]
- Nursallia, Blot 1987 [Nursallidae]
- Nushbiella, Popov 1986 [Siphonotretidae]
- Nutricola, F. R. Bernard 1982 [Veneridae]
- Nuttallia, Dall 1900 [Psammobiidae]
- Nuttallides [Foraminifera]
- Nuttallina, Dall 1871 [Neoloricata]
- Nuttallinella [Foraminifera]
- Nuttallus [Foraminifera]
- Nuxocrinus, Mclntosh 1983 [Cladida]
- Nyaya, Rozova 1963 [Proetida]
- Nybelinoides, Taverne 1982 [Osmeriformes]
- Nybyoceras, Troedsson 1926 [Armenoceratidae]
- Nyctocrinus, Springer 1926 [Diplobathrida]
- Nyctopora, Nicholson 1879 [Lyoporidae]
- Nyege [Plectorhynchellidae]
- Nyella, Palmer 1979 [Ptychopariidae]
- Nyhamnella [Platycopida]
- Nymphaeoblastus, H. Von Peetz 1907 [Phaenoschismatidae]
- Nymphalucina, Speden 1970 [Lucinidae]
- Nymphograptus, Elles and Wood 1908 [Graptoloidea]
- Nymphorhynchia, Rzhonsnitskaya 1956 [Trigonirhynchiidae]
- Nyuella [Helcionellidae]
- Oamaruia, Finlay 1924 [Cancellariidae]
- Oanduella [Cryptostomata]
- Oanduellina, Pushkin 1977 [Escharoporidae]
- Oberhauserella [Foraminifera]
- Obesacapsula, Pessagno 1977 [Spongocapsulidae]
- Obesaria [Reticulariidae]
- Obex, Iredale 1925 [Buccinidae]
- Obexomia [Heterostrophia]
- Obinautilus, Kobayashi 1954 [Argonautidae]
- Obisafitella [Podocopida]
- Oblada, Cuvier 1829 [Perciformes]
- Obliaspis [Pteraspidomorphes]
- Obliquatheca [Exilithecida]
- Obliquina [Foraminifera]
- Obliquipecten, Hind 1903 [Chaenocardiidae]
- Obliquisylthis [Palaeocopida]
- Obliquostoma [Cheilostomata]
- Oblisicornus [Hyolithida]
- Oblitacythereis [Podocopida]
- Obliteraspis, Ogienko 1984 [Pliomeridae]
- Oblongarcula [Terebrataliidae]
- Oblongiprion [Eunicemorpha]
- Oboedalites [Hyolithida]
- Obolellida, order, Rowell 1965 [Obolellata]
- Obolopsis, Saito 1936 [Obolidae]
- Obolorugia [Obolorugidae]
- Obolus, Eichwald 1829 [Obolidae]
- Obornella, Cox 1959 [Archaeogastropoda]
- Obotrita [Palaeocopida]
- Obovothyris [Zeilleriidae]
- Obrimia [Pholadomyida]
- Obrucheviaspis, Ivshin 1953 [Ptychopariida]
- Obrutchevites, M. N. Vavilov 1977 [Ceratitida]
- Obscurella [Ancistrorhynchidae]
- Obsoletes [Triticitidae]
- Obsoletirhynchia, Shi 1992 [Tetrarhynchiidae]
- Obtortio, Hedley 1899 [Diastomatidae]
- Obturamentella, Amsden 1958 [Obturamentellidae]
- Obtusella, Cossmann 1921 [Rissoidae]
- Obtusicostites [Cephalopoda]
- Occidentoschwagerina [Fusulinoidea]
- Occlusacythereis [Podocopida]
- Occulocytheropteron [Podocopida]
- Occultocystis [Mitrata]
- Occultocythereis [Podocopida]
- Oceanodroma, Reichenbach 1950 [Procellariiformes]
- Ocellaria [Demospongea]
- Ocenebra, Leach in Gray 1847 [Muricidae]
- Ochesaarina [Palaeocopida]
- Ochesaarina [Ostracoda]
- Ochescapha [Palaeocopida]
- Ochetoceras [Oppeliidae]
- Ochetochilus, Cossmann 1899 [Purpurinidae]
- Ochetosella, Canu and Bassler 1917 [Romancheinidae]
- Ochetosellina [Cheilostomata]
- Ochotoceras [Hildoceratidae]
- Ochotochlamys [Pectinidae]
- Ocinebrellus [Neogastropoda]
- Ocinebrina, Jousseaume 1880 [Muricidae]
- Ockerella [Palaeocopida]
- Ocnerorthis [Eoorthidae]
- Ocorthis [Orthidae]
- Octamerella, Teichert and Sweet 1962 [Hemiphragmoceratidae]
- Octatormentum, Nazarov and Ormiston 1985 [Pseudolitheliidae]
- Octillaenus, Salter 1867 [Illaenidae]
- Octobolbina [Palaeocopida]
- Octobronteus, Weber 1945 [Ptychopariida]
- Octobrum, Laubenfels 1955 [Hexactinosa]
- Octoheliocoenia [Stylinidae]
- Octomedusa [Coronatida]
- Octonaria [Metacopida]
- Octonariellina [Metacopida]
- Octosylthere [Podocopida]
- Octotremacis [Helioporacea]
- Octotympanum [Nassellaria]
- Oculeus, Poletaeva and Romanenko 1970 [Remopleurididae]
- Oculina, Gray 1847 [Oculinidae]
- Oculinella, Yakovlev 1939 [Trachypsammiidae]
- Oculipora, Sokolov 1952 [Alveolitidae]
- Oculospongia, Fromentel 1860 [Stellispongiidae]
- Ocypode, F. Weber 1795 [Ocypodidae]
- Odaraia [Arthropoda]
- Odarovithyris [Lobothyrididae]
- Odessites, Ljaschenko 1969 [Rossiitidae]
- Odetta [Heterostrophia]
- Odoardia [Archaeogastropoda]
- Odonotrypa [Cystoporata]
- Odonteobolca, Krell 1991 [Perciformes]
- Odontionella [Calloporidae]
- Odontobasis, Meek 1876 [Buccinidae]
- Odontocephalus, Conrad 1840 [Dalmanitidae]
- Odontochile, Hawle and Corda 1847 [Dalmanitidae]
- Odontocyathus, Moseley 1881 [Caryophylliidae]
- Odontodiscoceras [Cephalopoda]
- Odontofusus, Whitfield 1892 [Fasciolariidae]
- Odontogriphus [Mollusca]
- Odontogryphaea, Ihering 1903 [Ostreidae]
- Odontophyllum, Simpson 1900 [Halliidae]
- Odontopleura, Emmrich 1839 [Odontopleuridae]
- Odontopleurida, order, Whittington 1959 [Trilobita]
- Odontopolys [Muricidae]
- Odontopurpura [Neogastropoda]
- Odontospirifer [Paeckelmanellidae]
- Odontoturbo, de Loriol 1887 [Chilodontidae]
- Odoratus [Rafinesquinidae]
- Odostomella, Bucquoy et al. 1844 [Pyramidellidae]
- Odostomia, Fleming 1817 [Pyramidellidae]
- Odostomidea [Heterostrophia]
- Oecematobolbina [Palaeocopida]
- Oeciophylloporina [Fenestrata]
- Oecoptychius [Oecoptychiidae]
- Oedalmia, Cuif 1976 [Reimaniphylliidae]
- Oedematocidaris [Cidaroida]
- Oedicybele, Whittington 1938 [Staurocephalidae]
- Oedorhachis, Resser 1938 [Diplagnostidae]
- Oehlertella, Hall and Clarke 1892 [Disciniidae]
- Oehlertia, Pillet 1972 [Proetida]
- Oehlerticrinus, Le Menn 1975 [Monobathrida]
- Oejlemyra [Palaeocopida]
- Oelandocaris, K. J. Müller 1983 [Crustacea]
- Oelandoceras, Foerste 1932 [Ellesmeroceratidae]
- Oelandodus [Conodontophorida]
- Oelandograptus [Graptoloidea]
- Oenochoacrinus, Breimer 1962 [Monobathrida]
- Oenonites [Eunicemorpha]
- Oenopota, Mörch 1852 [Conidae]
- Oepikaluta [Ostracoda]
- Oepikella [Palaeocopida]
- Oepikinella [Strophomenidae]
- Oepikites, Khazanovitch and Popov 1984 [Obolidae]
- Oepikium [Palaeocopida]
- Oepikodus [Conodonta]
- Oertliella [Podocopida]
- Oeselaspis [Cephalaspidiformes]
- Oesia [Problematica]
- Oestophorus, Miller 1892 [Edestidae]
- Offadesma [Pholadomyida]
- Offaster [Holasteridae]
- Offella [Demospongea]
- Offleyoceras, Foerste 1928 [Offleyoceratidae]
- Offlyeotrochus [Euomphalina]
- Offneria, Paquier 1905 [Caprinidae]
- Ogcocephalus, Fischer 1813 [Lophiiformes]
- Ogilbia, Jordan and Evermann 1898 [Bythitidae]
- Ogilviastraea, Oppenheim 1930 [Agariciidae]
- Ogilviella [Atrypinidae]
- Ogilvilasma, Pedder 1978 [Streptelasmatidae]
- Ogilvinella, Eliasova 1976 [Rhipidogyridae]
- Ogiva, Jullien 1881 [Onychocellidae]
- Ogivalia [Cheilostomata]
- Ogivalina [Cheilostomata]
- Ogivia, Harris and Burrows 1891 [Triphoridae]
- Oglu [Atrypidae]
- Oglupes [Atrypidae]
- Ogmasaphus, Jaanusson 1953 [Asaphidae]
- Ogmoconcha, Triebel 1941 [Healdiidae]
- Ogmoconchella [Healdiidae]
- Ogmodirus, Williston and Moodie 1913 [Elasmosauridae]
- Ogmoopsis [Palaeocopida]
- Ogyginus, Raymond 1912 [Asaphidae]
- Ogygiocarella, Harrinton and Leanza 1957 [Asaphidae]
- Ogygiocaris, Angelin 1854 [Asaphidae]
- Ogygites, Tromelin and Lebescote 1876 [Asaphidae]
- Ogygitoides, Kobayashi 1934 [Asaphidae]
- Ogygoceras [Orthocerotidae]
- Ogygopsis, Walcott 1889 [Dorypygidae]
- Oharaia, Nelson 1977 [Syringoporidae]
- Ohioaspis, Wells 1944 [Rhenanida]
- Ohiocaris [Archaeostraca]
- Ohioceras, Shimizu and Obata 1935 [Kionoceratidae]
- Ohiocrinus, Wachsmuth and Springer 1886 [Heterocrinidae]
- Ohmdenia, Hauff 1953 [Pachycormidae]
- Ohnopora, Minato and Minoura 1977 [Syringolitidae]
- Ohuus, Sato 1962 [Stomiatiformes]
- Oidalagnostus, Westergard 1946 [Diplagnostidae]
- Oidalaproetus, Wu 1977 [Proetida]
- Oikozetetes [Orthrozanclidae]
- Oina, Popov and Tikhonov 1990 [Naukatidae]
- Oiosia [Gerkispiridae]
- Oistoceras, Buckman 1911 [Liparoceratidae]
- Oistodella [Conodontophorida]
- Oistodus [Conodontophorida]
- Oistotrigonia, Cox 1952 [Trigoniidae]
- Ojlemyra [Palaeocopida]
- Oketaella [Foraminifera]
- Okinawanoarca [Arcida]
- Okinawavoluta [Neogastropoda]
- Oklahomacrinus, Moore 1939 [Aesiocrinidae]
- Oklahomacystis [Comarocystitida]
- Okribites [Parkinsoniidae]
- Okulitchicyathus [Archaeocyathida]
- Okulitchina [Demospongea]
- Olangocoelia, Bechstädt and Brandner 1970 [Olangocoeliidae]
- Olbia [Podocopida]
- Olcostephanus, Neumayr 1875 [Olcostephanidae]
- Oldhaminella [Lyttoniidae]
- Olegaspis, Ivshin 1962 [Lonchocephalidae]
- Olekmaspis, Suvorova 1956 [Ptychopariida]
- Olenaspella, Wilson 1956 [Aphelaspididae]
- Olenekina, Egorova 1970 [Ptychopariidae]
- Olenekoceras [Sibiritidae]
- Olenellida, order [Trilobita]
- Olenellus, Hall 1861 [Olenellidae]
- Oleneothyris [Terebratulida]
- Olenikites, A. Hyatt 1900 [Sibiritidae]
- Olenoides, Meek 1877 [Dorypygidae]
- Olenoidestranans [Corynexochida]
- Olentella, Ivshin 1953 [Aphelaspididae]
- Olentotreta, Koneva et al. 1990 [Acrotretidae]
- Olenus, Dalman 1827 [Olenidae]
- Oleorthis, Havlicek 1968 [Orthida]
- Olequahia, Stewart 1927 [Bursidae]
- Olgaecyathus [Ajacicyathida]
- Olgaspis, Korobeinikova 1965 [Redlichiida]
- Oliganisus [Kloedenellidae]
- Oligobrachyocrinus, Arendt 1981 [Cladida]
- Oligoceras [Oncocerida]
- Oligocythereis [Podocopida]
- Oligodiodon, Tavani 1955 [Tetraodontiformes]
- Oligodus [Conodontophorida]
- Oligolactoria, Tyler and Gregorova 1991 [Tetraodontiformes]
- Oligometopus, Resser 1936 [Cheilocephalidae]
- Oligomys [Bohemiellidae]
- Oligophylloides, Rozkowska 1969 [Heterophylliidae]
- Oligophyllum, Pocta 1902 [Pentaphyllidae]
- Oligophyma, Pomel 1869 [Toxopneustidae]
- Oligoplagia [Porifera]
- Oligopleura [Amiiformes]
- Oligopleurus, Thiollière 1850 [Oligopleuridae]
- Oligoplites, Gill 1864 [Carangidae]
- Oligoporus [Palaechinidae]
- Oligoptycha, Meek 1876 [Ringiculidae]
- Oligoptycherhynchus [Trigonirhynchiidae]
- Oligoptyxis [Heterostrophia]
- Oligopus, Risso 1810 [Ophidiiformes]
- Oligopygoida, order [Echinoidea]
- Oligopygus [Oligopygidae]
- Oligorachis, Imbrie 1959 [Araksalosiidae]
- Oligorthis [Plectorthidae]
- Oligotopora [Cheilostomata]
- Olimfalunia [Podocopida]
- Olinaecaris, Van Straelen 1924 [Decapoda]
- Olingechiton [Scanochitonidae]
- Oliva, Bruguière 1789 [Olividae]
- Oliva (Strephonella), Dall 1909 [Olividae]
- Olivancillaria, d'Orbigny 1839 [Olividae]
- Oliveirania [Polychaeta]
- Olivella, Swainson 1831 [Olividae]
- Olivella (Dactylidella), Woodring 1928 [Olividae]
- Oliveria, Sutherland 1965 [Acervulariidae]
- Olivia [Cancellariidae]
- Olivula [Olividae]
- Olkenbachia [Demospongea]
- Ollachitina [Rhizopodea]
- Olssonella, Glibert and Van de Poel 1967 [Cardiida]
- Olssonina [Foraminifera]
- Omalaxis, Deshayes 1832 [Omalaxidae]
- Omalenlina [Mollusca]
- Omalogyra, Jeffreys 1867 [Omalogyridae]
- Omalosecosa [Celleporidae]
- Omanimaria [Archaeogastropoda]
- Ombonia, Caneva 1906 [Meekellidae]
- Omeipsis, Kobayashi 1951 [Taihungshaniidae]
- Omiphyllum, Kato 1967 [Pseudopavonidae]
- Ommatartus, Haeckel 1881 [Coccodiscidae]
- Ommatocampe [Spumellaria]
- Ommatocarcinus, White 1852 [Goneplacidae]
- Ommatodiscus [Spumellaria]
- Ommatokrithe [Podocopida]
- Ommatospyris [Spumellaria]
- Ommokris, Holloway 1981 [Dalmanitidae]
- Omnivenus [Cardiida]
- Omnutakhella [Atrypidae]
- Omolonella [Rhynchonellidae]
- Omolonia [Stringocephalidae]
- Omolonorhynchia [Rhynchonellida]
- Omosoma, Costa 1857 [Polymixiiformes]
- Omosomopsis, Gaudant 1978 [Actinopteri]
- Omphalocyclus [Orbitoididae]
- Omphaloptycha [Coelostylinidae]
- Omphalosaurus, J. C. Merriam 1906 [Omphalosauridae]
- Omphalotis [Endothyridae]
- Omphalotropis, Pfeiffer 1851 [Assimineidae]
- Omulites, Ljaschenko 1969 [Rossiitidae]
- Onaraspis, Opik 1967 [Metadoxididae]
- Onavia [Productellidae]
- Oncagnostus, Whitehouse 1936 [Agnostidae]
- Onchocephalina, Repina 1960 [Antagmidae]
- Onchocephalites, Rasetti 1957 [Ptychopariidae]
- Onchocephalus, Resser 1937 [Antagmidae]
- Onchonotellus, Lermontova 1956 [Catillicephalidae]
- Onchonotina, Lu 1964 [Catillicephalidae]
- Onchonotopsis [Catillicephalidae]
- Onchonotus, Raymond 1924 [Catillicephalidae]
- Onchopeltis, Rasetti 1944 [Ptychopariida]
- Onchopristus [Chondrichthyes]
- Onchotrochus, Duncan 1870 [Guyniidae]
- Oncoceras, J. Hall 1847 [Oncoceratidae]
- Oncocladia [Demospongea]
- Oncodona [Demospongea]
- Oncograptus [Graptoloidea]
- Oncolepis, Bassani 1898 [Actinopteri]
- Oncopareia, Bosquet 1854 [Nephropidae]
- Oncorhynchus, Suckley 1860 [Salmoniformes]
- Oncosella [Lyssacinosida]
- Oncotechmonus [Myodocopida]
- Oncousoecia, Canu 1918 [Oncousoeciidae]
- Ondadiplocteniopsis [Scleractinia]
- Onega [Paratrilobita]
- Oneotoceras, Ulrich 1926 [Ellesmeroceratidae]
- Oneotodus [Conodontophorida]
- Ongleya, Finlay and Marwick 1937 [Acteonidae]
- Onithochiton, Gray 1847 [Chitonidae]
- Onkogrypha [Bivalvia]
- Onkospira, Zittel 1873 [Amberleyidae]
- Onnia, Bancroft 1933 [Trinucleidae]
- Onniella, Bancroft 1928 [Dalmanellidae]
- Onnizetina [Dalmanellidae]
- Onoba, H. Adams and A. Adams 1834 [Rissoidae]
- Ontariocrinus, Jaekel 1918 [Cladida]
- Onugorhynchia [Septalariidae]
- Onuphionella [Problematica]
- Onuphis [Eunicemorpha]
- Onuxodon, Smith 1955 [Carapidae]
- Onychocella, Jullien 1882 [Onychocellidae]
- Onychocellaria [Cheilostomata]
- Onychocrinus, Lyon and Cassidy 1860 [Taxocrinida]
- Onychodictyon [Panarthropoda]
- Onychodus [Onychodontidae]
- Onychophyllum, Smith 1930 [Lykophyllidae]
- Onychoplecia, Cooper 1956 [Triplesiidae]
- Onychopterella [Onychopterellidae]
- Onychopyge, Harrington 1938 [Ceratopygidae]
- Onychoselache [Hybodontiformes]
- Onychotreta, Ulrich and Cooper 1936 [Triplesiidae]
- Onycopyge, Woodward 1880 [Cheiruridae]
- Onymagnostus, Opik 1979 [Ptychagnostidae]
- Onyxites [Discosorida]
- Oocerina, Foerste 1926 [Oncoceratidae]
- Oochiton [Schizochitonidae]
- Oocorys, P. Fischer 1883 [Cassidae]
- Oodiscus, Rasetti 1966 [Agnostida]
- Oolina, d'Orbigny 1839 [Ellipsolagenidae]
- Oolitella [Foraminifera]
- Ooliticia [Eucyclidae]
- Oolopygus [Nucleolitidae]
- Oonendoceras [Yanhecerida]
- Oonia [Pseudomelaniidae]
- Oosterella, Kilian 1911 [Oosterellidae]
- Oosthuizenella, Cooper 1982 [Calmoniidae]
- Oostrombus, Sacco 1893 [Thersiteidae]
- Ootomella [Raphitomidae]
- Opabinia [Problematica]
- Opalia, H. Adams and A. A 1858 [Epitoniidae]
- Opaliopsis [Nystiellidae]
- Opeamorphus [Lyssacinosida]
- Opechinus [Temnopleuridae]
- Opella [Archaeogastropoda]
- Operchallosteus, Kulczycki 1957 [Arthrodira]
- Operculina [Nummulitidae]
- Opertochasma, L. W. Stephenson 1953 [Pholadidae]
- Opertorbitolites [Soritidae]
- Opertum [Foraminifera]
- Opetionella, Zittel 1878 [Sollasellidae]
- Opetiosaurus, Kornhuber 1902 [Aigialosauridae]
- Ophidiiformes, order, Berg 1937 [Actinopteri]
- Ophidioceras [Orthocerida]
- Ophidion, Linnaeus 1758 [Ophididae]
- Ophigraptus [Dendroidea]
- Ophioceras, Barrande 1865 [Ophidioceratidae]
- Ophiocrinus, Salter 1856 [Diplobathrida]
- Ophiodermella, Bartsch 1944 [Neogastropoda]
- Ophiodesia [Poecilosclerida]
- Ophiodon, Girard 1854 [Scorpaeniformes]
- Ophionautilus [Cenoceratidae]
- Ophiosema, Opik 1968 [Archaeocopida]
- Ophiraphidites, Carter 1876 [Astrophorida]
- Ophisurus, Lacépède 1800 [Anguilliformes]
- Ophiurocrinus, Jaekel 1918 [Cladida]
- Ophryotrocha [Eunicemorpha]
- Ophrystoma, Zittel 1877 [Dactylocalycidae]
- Ophthalmidium, Kübler and Zwingli 1870 [Ophthalmidiidae]
- Ophthalmipora [Milioliporidae]
- Opikatia [Palaeocopida]
- Opikella [Leptestiidae]
- Opimaria [Cardiida]
- Opimilda, Iredale 1929 [Mathildidae]
- Opimocythere [Podocopida]
- Opiotoptera [Pterioida]
- Opipeuter, Fortey 1974 [Telephinidae]
- Opiphyllum, Kozyreva 1973 [Lithostrotionidae]
- Opis, Defrance 1824 [Astartidae]
- Opisoma, Stoliczka 1871 [Astartidae]
- Opisopneustes [Holasteridae]
- Opissaster, Pomel 1883 [Schizasteridae]
- Opisthobranchia, subclass, Milne-Edwards 1848 [Gastropoda]
- Opisthocoelus [Cyrtodontida]
- Opisthomyzon, Cope 1889 [Perciformes]
- Opisthonema, Yu 1974 [Opisthonematidae]
- Opisthonema, Gill 1862 [Clupeidae]
- Opisthoplax [Palaeocopida]
- Opisthoproctus, Vaillant 1888 [Osmeriformes]
- Opisthornithopora [Cheilostomata]
- Opisthotreta, Palmer 1954 [Acrotretidae]
- Opisthotrigonia [Trigoniida]
- Opistopteryx, Pictet and Humbert 1866 [Actinopterygii]
- Oplegnathus, Richardson 1840 [Perciformes]
- Oplophorus, Milne-Edwards 1837 [Oplophoridae]
- Opoa, Lane 1972 [Styginidae]
- Oppelia [Cephalopoda]
- Oppelisilia (Duncan 1867) [Oppelismiliidae]
- Oppligera [Poecilosclerida]
- Opsiconidion, Ludvigsen 1974 [Biernatidae]
- Opsidiscus, Westergard 1949 [Eodiscidae]
- Opsimasaphus, Kielan 1960 [Asaphidae]
- Opsiocrinus, Kier 1952 [Diplobathrida]
- Opsiosoryctocephalus, Sun 1994 [Corynexochida]
- Opsithrissops, Daniltshenko 1968 [Osteoglossiformes]
- Optivus, Whitley 1947 [Beryciformes]
- Optoturris [Neogastropoda]
- Oraniceras [Parkinsoniidae]
- Oratoceras [Oncocerida]
- Orbiasterocyathus [Ajacicyathida]
- Orbiblastus, D. B. Macurda 1965 [Spiraculata]
- Orbicoscinus [Ajacicyathida]
- Orbiculatisinurostrum [Leiorhynchidae]
- Orbiculiforma, Pessagno 1973 [Orbiculiformidae]
- Orbiculopecten [Pterioida]
- Orbiculopora, Batrukova 1969 [Acrotretida]
- Orbiculothyris, Wolfart Bender and Stein 1968 [Trematidae]
- Orbicyathellus [Ajacicyathida]
- Orbicyathus [Ajacicyathida]
- Orbignya [Hippuritidae]
- Orbignycoenia [Stylinidae]
- Orbignycrinus [Millericrinida]
- Orbignyella, Ulrich and Bassler 1904 [Monticuliporidae]
- Orbignygyra, Alloiteau 1952 [Rhipidogyridae]
- Orbignyna [Foraminifera]
- Orbignyopora [Ctenostomata]
- Orbipora, Eichwald 1856 [Batostomellidae]
- Orbitammina, Berthelin 1893 [Foraminifera]
- Orbitella [Cardiida]
- Orbitestella, Iredale 1906 [Orbitestellidae]
- Orbithele, Sdzuy 1955 [Acrothelidae]
- Orbitoclypeus [Foraminifera]
- Orbitocyclina [Foraminifera]
- Orbitoides [Orbitoididae]
- Orbitokathina [Foraminifera]
- Orbitolina [Orbitolinidae]
- Orbitolina [Podocopida]
- Orbitolinella [Foraminifera]
- Orbitolinopsis [Orbitolinidae]
- Orbitolites [Soritidae]
- Orbitoplax, Tucker and R. Feldmann 1990 [Euryplacidae]
- Orbitoproetus, Pillet 1969 [Proetidae]
- Orbitopsella [Foraminifera]
- Orbitremites [Spiraculata]
- Orbitulipora [Orbituliporidae]
- Orbula, Foreman 1973 [Bekomidae]
- Orbulina, d'Orbigny 1839 [Globigerinidae]
- Orbulinoides [Foraminifera]
- Orcadia [Foraminifera]
- Orcofabella [Palaeocopida]
- Ordoniya [Podocopida]
- Ordosia, Lu 1954 [Corynexochida]
- Ordosoceras, Chang 1959 [Polydesmiidae]
- Ordovicia [Palaeocopida]
- Ordovicina [Saccamminidae]
- Ordovizona [Palaeocopida]
- Orechina [Palaeocopida]
- Orectodictya [Rhinidictyidae]
- Orectolobiformes, order, Applegate 1972 [Chondrichthyes]
- Orectoloboides, Cappetta 1977 [Orectolobiformes]
- Orectospira, Dall 1925 [Turritellidae]
- Orecyta [Demospongea]
- Oreisator, Geyer and Malinky 1997 [Ptychopariida]
- Orenburgella [Elythidae]
- Oreochima [Pachycormiformes]
- Orestia, Lupu 1972 [Radiolitidae]
- Orestiacanthus [Symmoriidae]
- Orestites [Lobitidae]
- Oretia [Pergamidiidae]
- Organoceras [Cephalopoda]
- Orhomalus, A. Etallon 1861 [Decapoda]
- Orictocara [Trilobita]
- Oridorsalis, Anderson 1961 [Rotaliidae]
- Orientalina [Palaeocopida]
- Orienticyathus [Ajacicyathida]
- Orientina [Foraminifera]
- Orientospirifer [Delthyrididae]
- Orientothyris [Gibbithyrididae]
- Orienturus, Repina 1973 [Trilobita]
- Orietalia [Foraminifera]
- Orinella [Pyramidellidae]
- Orionastraea, Smith 1917 [Lithostrotionidae]
- Orionina [Podocopida]
- Orionoides [Perisphinctidae]
- Oriskania [Centronellidae]
- Orithostella [Foraminifera]
- Oriundogutta, Nazarov 1988 [Inaniguttidae]
- Orlovia, Walcott and Resser 1928 [Ptychopariida]
- Orloviella [Ptychopariida]
- Ormastralium, Sacco 1896 [Turbinidae]
- Ormathops, Delo 1935 [Dalmanitidae]
- Ormistonella, De Wever and Caridroit 1984 [Ormistonellidae]
- Ormistoniella, Cooper 1982 [Proetidae]
- Ormoceras, Stokes 1840 [Ormoceratidae]
- Ornamentaria, Schilder and Schilder 1936 [Cypraeidae]
- Ornamentaspis, Geyer 1990 [Ellipsocephalidae]
- Ornatanomalina [Foraminifera]
- Ornategulum, Forey 1973 [Actinopteri]
- Ornatoclymenia, Bogoslovsky 1979 [Piriclymeniidae]
- Ornatoleberis [Podocopida]
- Ornatophyllum, Nikolaeva 1964 [Entelophyllidae]
- Ornatoporta [Serpulimorpha]
- Ornatoptygmatis [Neogastropoda]
- Ornatothyrella [Aulacothyropsidae]
- Ornatothyris [Gibbithyrididae]
- Ornatus [Lychniscosa]
- Ornithaster [Palaeostomatidae]
- Ornithella [Zeilleriidae]
- Ornithopecten [Pterioida]
- Ornithoprion [Caseodontidae]
- Ornithothyris [Gibbithyrididae]
- Ornopsis, B. Wade 1916 [Fasciolariidae]
- Ornothyrella, Havlicek 1971 [Spiriferida]
- Orocystites [Rhombifera]
- Orodes, Geyer 1990 [Ellipsocephalidae]
- Orometopus, Broegger 1898 [Alsataspididae]
- Orophocrinus, K. V. von Seebach 1865 [Fissiculata]
- Orophosaurus, Cope 1851 [Sauropterygia]
- Orospheciom [Demospongea]
- Orostaurs [Spumellaria]
- Orozoe [Archaeostraca]
- Orphanaspis, Prantl and Pribyl 1949 [Odontopleuridae]
- Orria, Walcott 1916 [Corynexochida]
- Orriella, Rasetti 1938 [Dolichometopidae]
- Orstenocarida, order, Müller and Walossek 1988 [Arthropoda]
- Orthambonites, Pander 1830 [Orthidae]
- Orthaspidoceras [Cephalopoda]
- Orthaster [Spatangoida]
- Orthaulax, Gabb 1872 [Thersiteidae]
- Orthella [Cornuspiridae]
- Orthida, order, Schuchert and Cooper 1932 [Rhynchonellata]
- Orthidiella, Ulrich and Cooper 1936 [Orthidiellidae]
- Orthidium, Hall and Clarke 1892 [Orthidiellidae]
- Orthiella [Draboviidae]
- Orthildaites [Hildoceratidae]
- Orthis, Dalman 1828 [Orthidae]
- Orthisocrania, Rowell 1963 [Craniidae]
- Orthobairdia [Bairdiidae]
- Orthocardium, Tremlett 1950 [Cardiidae]
- Orthocarina [Atrypinidae]
- Orthocera (Breynius 1832) [Lagenidae]
- Orthoceras, Breynius 1832 [Orthoceratidae]
- Orthocerida, order, O. Kuhn 1940 [Cephalopoda]
- Orthochetus, Cossmann 1889 [Cerithiidae]
- Orthochilus, Cossmann 1889 [Planaxidae]
- Orthocidaris [Orthopsidae]
- Orthoconorca [Serpulimorpha]
- Orthocormus [Pachycormiformes]
- Orthocrinus, Jaekel 1895 [Diplobathrida]
- Orthocycloceras, Barskov 1972 [Orthoceratidae]
- Orthocypris, Kummerow 1953 [Bairdiocyprididae]
- Orthodesma, Hall and Whitfield 1875 [Modiomorphidae]
- Orthodiscus, Schrammen 1924 [Ventriculitidae]
- Orthodochmioceras [Cephalopoda]
- Orthogarantiana [Cephalopoda]
- Orthogonium [Medusae]
- Orthogonocrinus [Roveacrinida]
- Orthograptus, Lapworth 1873 [Orthograptidae]
- Orthokarstenia [Foraminifera]
- Ortholina [Cancellothyrididae]
- Ortholites, Chudinova 1975 [Thecostegitidae]
- Orthomorphina [Foraminifera]
- Orthonaria [Palaeocopida]
- Orthonybyoceras, S. Shimizu and T. Obata 1935 [Proteoceratidae]
- Orthopelta [Eunicemorpha]
- Orthophyllum, Pocta 1902 [Anthozoa]
- Orthopleura [Areostrophiidae]
- Orthopora [Rhabdomesidae]
- Orthopristis, Girard 1858 [Perciformes]
- Orthopsis, Cotteau 1864 [Orthopsidae]
- Orthoptychus, Futterer 1892 [Caprinidae]
- Orthoptyxis, Yang & Wang 1985 [Cephalaspida]
- Orthorhynchula [Orthorhynchulidae]
- Orthosphinctes, Schindewolf 1925 [Ataxioceratidae]
- Orthospirifer [Spinocyrtiidae]
- Orthostrophella [Orthidae]
- Orthostrophia [Orthidae]
- Orthosurcula, Casey 1904 [Turridae]
- Orthotetes [Orthotetidae]
- Orthotetoides [Orthotetidae]
- Orthothecimorpha, class [Hyolitha]
- Orthothetina, Schellwien 1900 [Meekellidae]
- Orthothrix [Strophalosiidae]
- Orthotichia, Hall and Clarke 1892 [Schizophoriidae]
- Orthotoma, Quenstedt 1869 [Orthotomidae]
- Orthotrigonia, Cox 1952 [Myophorellidae]
- Orthotrinacria [Milioliporidae]
- Orthotropia [Linoporellidae]
- Orthovertella, Cushman and Waters 1928 [Cornuspiridae]
- Orthoyoldia, Verrill 1897 [Nuculanidae]
- Ortmannia [Astrophorida]
- Ortmannispongia [Demospongea]
- Ortonella [Cyrtodontidae]
- Orulgania [Licharewiidae]
- Orulganites, Ruzhencev 1960 [Orulganitidae]
- Orusia, Walcott 1905 [Finkelnburgiidae]
- Orvikuina, Gross 1953 [Palaeonisciformes]
- Oryctocare, Tomashpolskaya 1961 [Corynexochida]
- Oryctocephalina, Tomashpolskaya 1961 [Oryctocephalidae]
- Oryctocephalites, Resser 1939 [Oryctocephalidae]
- Oryctocephalops, Lermontova 1940 [Oryctocephalidae]
- Oryctocephalus, Walcott 1886 [Oryctocephalidae]
- Oryctoderma [Hemisphaeramminidae]
- Oryctomya [Cardiida]
- Orygmaspis, Resser 1937 [Parabolinoididae]
- Orygmophyllum, Fomichev 1953 [Aulophyllidae]
- Osangularia [Foraminifera]
- Osbornoceras, Foerste 1936 [Karoceratidae]
- Osburnostylus [Cyclostomata]
- Osceolia, Walcott 1914 [Asaphida]
- Osculigera, Kühn 1933 [Radiolitidae]
- Osculipora [Cyclostomata]
- Osculocystis, Paul 1967 [Rhombifera]
- Osekaspis, Prantl and Pribyl 1947 [Cheiruridae]
- Osilinus [Trochidae]
- Oslodictyon, Mori 1978 [Clathrodictyidae]
- Oslogonites, Öpik 1939 [Gonambonitidae]
- Oslograptus [Graptoloidea]
- Osmeriformes, order [Actinopteri]
- Osmerus, Forskal 1775 [Salmonidae]
- Osmotoxotis [Palaeocopida]
- Osoinia [Cardiida]
- Osorioichthys, Casier 1954 [Palaeonisciformes]
- Ospriasolen [Cardiida]
- Ossiania, Monterosato 1884 [Cephalaspida]
- Ossicrinus [Roveacrinida]
- Ostariostoma, Schaeffer 1949 [Elopiformes]
- Ostenocaris [Ostenocarididae]
- Osteocrinus [Roveacrinida]
- Osteoglossiformes, order, Berg 1940 [Actinopteri]
- Osteomya, Moesch 1874 [Pholadomyidae]
- Osthimosia [Celleporidae]
- Ostlingoceras, Hyatt 1900 [Turrilitidae]
- Ostomya, Conrad 1874 [Corbulidae]
- Ostracion, Rafinesque 1815 [Ostraciidae]
- Ostracoberyx, Fowler 1934 [Perciformes]
- Ostrea, Linnaeus 1758 [Ostreidae]
- Ostreavicula [Bivalvia]
- Ostreinella [Pterioida]
- Ostreola, Monterosato 1884 [Ostreidae]
- Ostreonella [Pterioida]
- Otapiria, Marwick 1935 [Monotidae]
- Otaria, Peron 1816 [Carnivora]
- Otarionella, Weyber 1965 [Aulacopleuridae]
- Otarionides, Alberti 1969 [Aulacopleuridae]
- Otarorhyncha [Rhynchotrematidae]
- Otatara, Ponder 1965 [Cingulopsidae]
- Otekmaspis [Trilobita]
- Otenaspella [Trilobita]
- Othneiocrinus [Crinoidea]
- Otionella [Otionellidae]
- Otoceltites, C. Diener 1916 [Thanamitidae]
- Otocythere [Podocopida]
- Otohoplites, Steinmann 1925 [Hoplitidae]
- Otoites [Otoitidae]
- Otollonia, Woodring 1928 [Archaeogastropoda]
- Otomitla, Felix 1891 [Amiiformes]
- Otomphalus, Cossmann 1902 [Archaeogastropoda]
- Otopleura, P. Fischer 1885 [Pyramidellidae]
- Otopora [Cheilostomata]
- Otoscaphites, Wright 1953 [Scaphitidae]
- Otospirifer [Hysterolitidae]
- Otostoma, d'Archaic 1859 [Neritidae]
- Otraczetia [Palaeocopida]
- Ottadalenites [Orthida]
- Ottawacrinus, Billings 1887 [Cladida]
- Ottawella [Eunicemorpha]
- Ottawina [Phyllodocemorpha]
- Ottenbyaspis, Bruton 1968 [Ptychopariida]
- Ottoia, Walcott 1911 [Ottoiidae]
- Ottoseetaxis [Fenestrata]
- Otukaia [Archaeogastropoda]
- Otusia [Eoorthidae]
- Ouachitaia [Podocopida]
- Ouaka, Cheng 1986 [Latentifistulidae]
- Oudardia [Tellinidae]
- Ouijjania, Hupe 1953 [Ptychopariida]
- Oulangia, Milne-Edwards and Haime 1848 [Rhizangiidae]
- Oulastrea, Milne-Edwards and Haime 1848 [Faviidae]
- Oulophyllia, Milne-Edwards and Haime 1848 [Merulinidae]
- Ourikaia, Geyer 1990 [Trilobita]
- Ovalastrea, d'Orbigny 1849 [Latomeandridae]
- Ovalipes, Rathbun 1898 [Carcinidae]
- Ovalitheca [Hyolithomorpha]
- Ovalocephalus, Koroleva 1959 [Hammatocnemidae]
- Ovalospira [Atrypinidae]
- Ovaluta, Zhang 1987 [Archaeocopida]
- Ovalveolina [Alveolinidae]
- Ovatia [Monticuliferidae]
- Ovaticeras [Hildoceratidae]
- Ovatipsa, Iredale 1931 [Cypraeidae]
- Ovatoquasillites [Podocopida]
- Overtonaspis, White 1961 [Arthrodira]
- Overtonia [Productellidae]
- Ovicardium [Cardiida]
- Oviclypeus [Conoclypeidae]
- Ovidiella, Nikitin and Popov 1984 [Trimerellidae]
- Ovinotis [Archaeogastropoda]
- Ovirissoa, Hedley 1916 [Rissoidae]
- Ovlatchania [Petasmariidae]
- Ovocarpus [Cornuta]
- Ovoceras, Flower 1936 [Brevicoceratidae]
- Ovocerina, Flower 1957 [Mandaloceratidae]
- Ovocytheridea [Podocopida]
- Ovornina [Tricorninidae]
- Ovulactaeon, Dall 1889 [Cephalaspida]
- Ovulaster [Micrasteridae]
- Ovulechinus [Cassiduloida]
- Ovulocystites [Comarocystitida]
- Ovulopsis, Moericke 1895 [Cephalaspida]
- Owenirhynchia [Cyclothyrididae]
- Oxinoxis [Oxinoxisidae]
- Oxintoceras, Kusina 1974 [Intoceratidae]
- Oxlosia, Ulrich and Cooper 1936 [Lingulida]
- Oxoplecia, Wilson 1913 [Triplesiidae]
- Oxyacrum, Cossmann 1889 [Neogastropoda]
- Oxyagnostus, Opik 1967 [Agnostidae]
- Oxybeloceras, Hyatt 1900 [Diplomoceratidae]
- Oxycerites [Cephalopoda]
- Oxycolpella [Diplospirellidae]
- Oxydiscites [Oppeliidae]
- Oxygonaspis, Zhang 1983 [Trilobita]
- Oxygonioceras, Foerste 1925 [Brevicoceratidae]
- Oxygyrus, Benson 1837 [Atlantidae]
- Oxyjulis, Gill 1864 [Perciformes]
- Oxylenticeras [Oppeliidae]
- Oxynaspis, Darwin 1852 [Oxynaspididae]
- Oxynautilus, Mojsisovics 1902 [Syringonautilidae]
- Oxynocrinus, Strimple and Watkins 1969 [Cladida]
- Oxynoticeras [Oxynoticeratidae]
- Oxynotus, Rafinesque 1810 [Oxynotidae]
- Oxyosteus, Jaeckel 1911 [Arthrodira]
- Oxyparoniceras [Hildoceratidae]
- Oxyperas, Mörch 1853 [Mactridae]
- Oxypleurorhynchia [Trigonirhynchiidae]
- Oxyprion [Eunicemorpha]
- Oxypteria [Pterioida]
- Oxystele [Trochidae]
- Oxyteuthis [Belemnitida]
- Oxythyreus [Decapoda]
- Oxytoma, Meek 1864 [Oxytomidae]
- Oxytornoceras, Becker 1993 [Tornoceratidae]
- Oxytropidoceras, Stieler 1920 [Brancoceratidae]
- Oxytropidoceras (Manuaniceras) (Spath 1925) [Brancoceratidae]
- Oxytus [Hyolithida]
- Oxyuropoda [Arthropoda]
- Oyonnaxastraea, Alloiteau 1952 [Amphiastreidae]
- Ozakiphyllum, Kato and Minato 1975 [Pseudopavonidae]
- Ozarkocoelia [Demospongea]
- Ozawainella, Thompson 1935 [Ozawainellidae]
- Ozius, H. Milne-Edwards 1834 [Oziidae]
- Ozodochilus, Cossmann 1918 [Trochidae]
- Ozopora, Weissermel 1941 [Favositidae]
- Ozora [Productidae]
- Ozospongia [Reticulosa]
- Ozotrachelus, Laubenfels 1955 [Vetulinidae]
- Ozourina [Foraminifera]
- Paalzowella [Foraminifera]
- Pabianocrinus [Sagenocrinida]
- Pacambocythere [Podocopida]
- Pachancorhynchia [Leiorhynchidae]
- Pachastrella [Astrophorida]
- Pachecoa, Harris 1919 [Arcidae]
- Pachendoceras, Ulrich and Foerste 1936 [Ellesmeroceratidae]
- Pachinion, Zittel 1878 [Corallistidae]
- Pachtoceras, Foerste 1926 [Oncocerida]
- Pachus, Blome 1984 [Pseudodictyomitridae]
- Pachyascus, Schrammen 1937 [Craticulariidae]
- Pachyaspis, Resser 1938 [Ptychopariidae]
- Pachyblastus, A. Breimer and D. B. Macurda 1972 [Fissiculata]
- Pachycalix [Diploporita]
- Pachycalymma, Schrammen 1901 [Siphoniidae]
- Pachycardia [Unionida]
- Pachycardioceras [Cardioceratidae]
- Pachycardium, Conrad 1869 [Cardiidae]
- Pachycaudites [Podocopida]
- Pachyceras, Bayle 1878 [Pachyceratidae]
- Pachychelys [Chelonia]
- Pachycidaris [Miocidaridae]
- Pachycladina [Conodonta]
- Pachyclymenia, Schindewolf 1937 [Pachyclymeniidae]
- Pachycoenia [Heterocoeniidae]
- Pachycormiformes, order, Berg 1940 [Actinopteri]
- Pachycorynea [Demospongea]
- Pachycoscinus [Ajacicyathida]
- Pachycothon, Schrammen 1901 [Carterellidae]
- Pachycraspedon [Cheilostomata]
- Pachycyathus [Caryophylliidae]
- Pachycymbiola, Ihering 1907 [Volutidae]
- Pachydera [Cribrilinidae]
- Pachydesma [Veneridae]
- Pachydesmoceras, Spath 1922 [Desmoceratidae]
- Pachydiadema [Cirripedia]
- Pachydictya, Ulrich 1882 [Rhinidictyidae]
- Pachydiscoides [Pachydiscidae]
- Pachydiscus, Zittel 1884 [Pachydiscidae]
- Pachydomella [Podocopida]
- Pachydomelloides [Podocopida]
- Pachydon [Corbulidae]
- Pachydontella, Marwick 1948 [Archaeogastropoda]
- Pachyduvalia [Belemnitida]
- Pachyerymnoceras [Pachyceratidae]
- Pachyfavosites, Sokolov 1952 [Favositidae]
- Pachygyra, Milne-Edwards and Haime 1848 [Meandrinidae]
- Pachyhelioplasma, Kim 1966 [Pseudoplasmoporidae]
- Pachyhexanchus [Hexanchiformes]
- Pachykellia, Bernard 1897 [Neoleptonidae]
- Pachylasma, Darwin 1854 [Pachylasmatidae]
- Pachylepisma [Hexactinellida]
- Pachylites, Yanet 1970 [Parastriatoporidae]
- Pachylocrinus, Wachsmuth and Springer 1879 [Pachylocrinidae]
- Pachylytoceras [Lytoceratidae]
- Pachymagas [Terebratellidae]
- Pachymegalodon [Hippuritida]
- Pachymelon, Marwick 1926 [Volutidae]
- Pachymura [Pharetronida]
- Pachymya, J. de C. Sowerby 1826 [Pholadomyidae]
- Pachymylus, Woodward 1892 [Callorhinchidae]
- Pachymytilus [Pterioida]
- Pachyocrinus, Billings 1859 [Parablastoidea]
- Pachyopis [Cardiida]
- Pachyosteus, Jaeckel 1903 [Selenosteidae]
- Pachyperna [Pterioida]
- Pachyphloia, Lange 1925 [Pachyphloiidae]
- Pachyphragma, Watkins 1959 [Aulocystidae]
- Pachyphyllia, Alloiteau 1957 [Pachyphyllidae]
- Pachypictonia [Perisphinctidae]
- Pachyplax [Athyrididae]
- Pachypleurosaurus, Broili 1927 [Pachypleuridae]
- Pachypora, Lindström 1873 [Pachyporidae]
- Pachypoterion, Hinde 1884 [Pleromatidae]
- Pachyproetus, Lutke 1990 [Proetida]
- Pachypsechia [Demospongea]
- Pachypteria, Koninck 1885 [Pterioida]
- Pachyrachis [Lychniscosa]
- Pachyredlichia, Chang 1966 [Redlichiidae]
- Pachyrisma [Megalodontidae]
- Pachyrismella [Cardiida]
- Pachyrissoina, Boettger 1893 [Rissoidae]
- Pachyrizodus [Crossognathiformes]
- Pachysceptron [Pennatulacea]
- Pachyseris, Milne-Edwards and Haime 1849 [Agariciidae]
- Pachysphinctes, Dietrich [Perisphinctidae]
- Pachystelliporella, Lin 1977 [Stelliporellidae]
- Pachystomaria [Cheilostomata]
- Pachystriatopora, Le Maître 1956 [Pachyporidae]
- Pachystylostroma, Nestor 1964 [Rosenellidae]
- Pachysyrnola [Heterostrophia]
- Pachyteichisma, Zittel 1877 [Pachyteichismatidae]
- Pachyteichopora [Cyclostomata]
- Pachyteuthis, Bayle 1878 [Belemnitida]
- Pachythaerus, Conrad 1869 [Crassatellidae]
- Pachytheca, Schlüter 1885 [Chaetetidae]
- Pachytheca [Cheilostomata]
- Pachythecella [Tessaradomidae]
- Pachythurammina [Foraminifera]
- Pachythyris [Loboidothyrididae]
- Pachytilodia [Pharetronida]
- Pachytraga, Paquier 1900 [Caprinidae]
- Pachytrissops [Pachycormiformes]
- Pacificocoelia, Boucot 1975 [Leptocoeliidae]
- Pacificurus [Encrinuridae]
- Pacinonion [Foraminifera]
- Pacipecten (Olsson 1961) [Pectinidae]
- Paciphacops, Maksimova 1971 [Phacopidae]
- Paciphacops (Viaphacops), Maximova 1972 [Phacopidae]
- Pacitrigonia, Marwick 1932 [Trigoniidae]
- Padagrosites [Cephalopoda]
- Padragosiceras [Cephalopoda]
- Padunoceras, Balashov 1960 [Padunoceratidae]
- Paeckelmannopora, Weissermel 1939 [Heliolitidae]
- Paegnium [Palaeocopida]
- Paenaequina [Leperditicopida]
- Paenula [Podocopida]
- Pagea, C. D. Waterston 1962 [Eurypterida]
- Pagecrinus, Kirk 1929 [Cladida]
- Pagellus, Cuvier and Valenciennes 1830 [Sparidae]
- Pagetia, Walcott 1916 [Eodiscidae]
- Pagetides, Rasetti 1945 [Eodiscidae]
- Pagodia, Walcott 1905 [Pagodiidae]
- Pagodospira [Murchisoniina]
- Pagodula, Monterosato 1884 [Muricidae]
- Pagrus, Lacépède 1802 [Sparidae]
- Paguristes, J. D. Dana 1851 [Diogenidae]
- Pahlenella [Clitambonitidae]
- Pahvantia [Arthropoda]
- Paianocrinus, Strimple 1951 [Cladida]
- Paichiashania [Trilobita]
- Paiderocrinus, Ausich 1985 [Monobathrida]
- Paijenborchella, Kingma 1948 [Cytheridae]
- Paijenborchellina [Podocopida]
- Paiutiida, order, Tynan 1983 [Problematica]
- Paiutitubulites [Paiutiida]
- Paivinia, Rosov and Dubatlova 1985 [Asaphida]
- Pakridictya [Cystoporata]
- Pakrioceras [Tarphycerida]
- Palacantholithus, Deflandre 1973 [Palacantholithidae]
- Palachemonella [Foraminifera]
- Paladmete, J. A. Gardner 1916 [Paladmetidae]
- Palaeacanthaspis, Brotzen 1934 [Acanthothoraci]
- Palaeacis, Haime 1857 [Palaeacidae]
- Palaeacmea [Hydroida]
- Palaeantedon [Comatulida]
- Palaearaea, Lindström 1882 [Calostylidae]
- Palaeastacus, Bell 1850 [Erymidae]
- Palaeastraea, Kühn 1936 [Reimaniphylliidae]
- Palaeastraea, Kühn 1936 [Reimaniphylliidae]
- Palaeatractus, Gabb 1869 [Neogastropoda]
- Palaechinus [Palaechinidae]
- Palaedaphus, van Beneden and Koninck 1864 [Dipteridae]
- Palaega, H. Woodward 1870 [Cirolanidae]
- Palaelophacmaea [Hydroida]
- Palaemon, Weber 1795 [Palaemonidae]
- Palaemysis [Eocaridacea]
- Palaenigma [Scyphozoa]
- Palaeoaphrodite [Phyllodocemorpha]
- Palaeoaplysina, Krotov 1888 [Hydrozoa]
- Palaeoatherina, Ferrandini and Gaudant 1977 [Atheriniformes]
- Palaeobalanus [Cirripedia]
- Palaeobalistum, Blainville 1818 [Nursallidae]
- Palaeobates [Acrodontidae]
- Palaeobigenerina [Foraminifera]
- Palaeobolus [Obolidae]
- Palaeobotryllus [Problematica]
- Palaeobranchiostoma [Cephalochordata]
- Palaeocancellaria [Neogastropoda]
- Palaeocarcharias, Beaumont 1960 [Lamniformes]
- Palaeocarcharodon, Casier 1960 [Otodontidae]
- Palaeocardia [Pterioida]
- Palaeocardita, Conrad 1867 [Palaeocarditidae]
- Palaeocarpilius, A. Milne-Edwards 1862 [Carpiliidae]
- Palaeocentrotus, Kühne 1941 [Lampridiformes]
- Palaeoceras, Flower 1954 [Plectronoceratidae]
- Palaeochaeta [Phyllodocemorpha]
- Palaeochoristites [Palaeochoristitidae]
- Palaeocomaster [Comatulida]
- Palaeoconcha, Miller 1889 [Praenuculidae]
- Palaeoconularia [Monocyathida]
- Palaeocopida, order, Henningsmoen 1953 [Ostracoda]
- Palaeocorolites, Leleshus 1965 [Theciidae]
- Palaeocoryne [Cryptostomata]
- Palaeocrinus, Billings 1859 [Cladida]
- Palaeocrisidia [Cyclostomata]
- Palaeoctopus, Woodward 1896 [Octopoda]
- Palaeocuma [Cumacea]
- Palaeocyathus, Foerste 1888 [Streptelasmatidae]
- Palaeocyclendoceras [Endocerida]
- Palaeocycloceras [Orthocerida]
- Palaeocyclus, Milne-Edwards and Haime 1849 [Palaeocyclidae]
- Palaeocystites [Gogiida]
- Palaeocytheridea [Podocopida]
- Palaeocytheridella [Podocopida]
- Palaeocyttus, Gaudant 1978 [Zeiformes]
- Palaeodactylophora [Eunicemorpha]
- Palaeodecaradium, Goodbody 1986 [Palaeoscenidiidae]
- Palaeodiadema [Diadematidae]
- Palaeodictyota [Dendroidea]
- Palaeodiscus, Salter 1857 [Lepidocentridae]
- Palaeodromites, A. Milne-Edwards 1865 [Dynomenidae]
- Palaeodus [Pteraspidomorphes]
- Palaeoentelophyllum, Lavrusevich 1971 [Stauriidae]
- Palaeoentolium [Pterioida]
- Palaeoephippium, Goodbody 1986 [Palaeoscenidiidae]
- Palaeofavosipora, Stasinska 1976 [Palaeofavosiporidae]
- Palaeofusulina [Schubertellidae]
- Palaeogadus, Von Rath 1859 [Merlucciidae]
- Palaeogaleus, Gurr 1963 [Triakidae]
- Palaeoglossa, Cockerell 1911 [Obolidae]
- Palaeogoniatites, Hyatt 1900 [Teicherticeratidae]
- Palaeograpsus, Bittner 1875 [Panopeidae]
- Palaeoholopus [Sagenocrinida]
- Palaeohomarus [Decapoda]
- Palaeohydatina, Cossmann 1895 [Cephalaspida]
- Palaeoisopoda, order [Pycnogonida]
- Palaeoisopus [Pycnogonida]
- Palaeojerea, Gerth 1927 [Anthaspidellidae]
- Palaeokylix [Hydroida]
- Palaeolenella, Repina 1960 [Palaeolenidae]
- Palaeolenides, Egorova 1967 [Ptychopariida]
- Palaeolentus [Trilobita]
- Palaeolenus, Mansuy 1912 [Palaeolenidae]
- Palaeoleptostrophia, Rong and Cocks 1994 [Leptostrophiidae]
- Palaeolima, Hind 1903 [Limidae]
- Palaeolithostrotion, Lavrusevich 1975 [Stauriidae]
- Palaeolituonella [Cuneolinidae]
- Palaeololigo, Naef 1921 [Paleololiginidae]
- Palaeolucina, Chao 1907 [Mactromyidae]
- Palaeolycus [Enchodontidae]
- Palaeomanon, Roemer 1860 [Astylospongiidae]
- Palaeomiliolina [Spiroloculinidae]
- Palaeomillepora [Milleporina]
- Palaeomoera, Stoliczka 1870 [Tellinidae]
- Palaeomolva, Daniltshenko 1947 [Gadidae]
- Palaeomunida, Lorenthey 1902 [Galatheidae]
- Palaeomunidopsis, Van Straelen 1924 [Galatheidae]
- Palaeomussa, Alloiteau 1952 [Mussidae]
- Palaeomya [Cardiida]
- Palaeomyra, A. Milne-Edwards 1861 [Leucosiidae]
- Palaeomyrus, Casier 1967 [Anguilliformes]
- Palaeonectris [Hydroida]
- Palaeoneilo (Metapalaeoneilo), Lamcke 1934 [Malletiidae]
- Palaeonephrops, H. Mertin 1941 [Nephropidae]
- Palaeonisciformes, order, O. P. Hay 1902 [Actinopteri]
- Palaeonisco (Gemmellaro 1878) [Neotaenioglossa]
- Palaeoniso, Gemmellaro 1878 [Coelostylinidae]
- Palaeopagurus, Van Straelen 1924 [Paguridae]
- Palaeopalaemon, Whitfield 1880 [Palaeopalaemonidae]
- Palaeopalinurus, Bachmayer 1954 [Palinuridae]
- Palaeopantopoda, order [Pycnogonida]
- Palaeopantopus [Pycnogonida]
- Palaeopedina [Pedinidae]
- Palaeopelyx [Eunicemorpha]
- Palaeopentacheles, Von Knebel 1907 [Palaeopentachelidae]
- Palaeoperca, Micklich 1978 [Perciformes]
- Palaeopercichthys, Greenwood 1983 [Serranidae]
- Palaeophichthys, Eastman 1908 [Tarrasiiformes]
- Palaeophillipsia, Sugiyama and Okano 1944 [Proetida]
- Palaeophilomedes [Myodocopida]
- Palaeophis, R. Owen 1841 [Palaeophiidae]
- Palaeophoberus, Glaessner 1932 [Stenochiridae]
- Palaeophragmodictya [Reticulosa]
- Palaeophreatoicus, Birshtein 1962 [Palaeophreatoicidae]
- Palaeophyllia [Scleractinia]
- Palaeophyllites, O. Welter 1922 [Palaeophyllitidae]
- Palaeophyllum, Billings 1858 [Stauriidae]
- Palaeophyma [Demospongea]
- Palaeopinna [Pterioida]
- Palaeopolycheles [Decapoda]
- Palaeoporites, Kiaer 1899 [Palaeoporitidae]
- Palaeopsammia, Wanner 1902 [Guyniidae]
- Palaeopteria, Whiteaves 1897 [Pterineidae]
- Palaeopyramidium, Goodbody 1986 [Palaeoscenidiidae]
- Palaeoreichelina [Foraminifera]
- Palaeorhaphis, Stewart 1927 [Neogastropoda]
- Palaeorhincodon, Herman 1975 [Rhincodontidae]
- Palaeorhynchus, Wagner 1860 [Palaeorhynchidae]
- Palaeorubus [Spumellaria]
- Palaeosaccus [Lyssacinosida]
- Palaeoscenidium, Deflandre 1953 [Palaeoscenidiidae]
- Palaeosceptron [Pennatulacea]
- Palaeoschizophoria [Schizophoriidae]
- Palaeoschmidities, Koneva 1979 [unclassified genus]
- Palaeoschmidtites, Koneva 1979 [Obolidae]
- Palaeoscolecida, class, Conway-Morris and Robison 1986 [Nematomorpha]
- Palaeoscolecida [Palaeoscolecida]
- Palaeoscolex, Whittard 1953 [Palaeoscolecidae]
- Palaeoscyllium, Wagner 1857 [Scyliorhinidae]
- Palaeosmilia, Milne-Edwards and Haime 1848 [Palaeosmiliidae]
- Palaeosmilia, Alloiteau 1952 [Scleractinia]
- Palaeosolemya [Solemyoida]
- Palaeospinax, Egerton 1872 [Paleospinacidae]
- Palaeospirifer [Ulbospiriferidae]
- Palaeospiroplectammina [Palaeospiroplectamminidae]
- Palaeospondylus [Pteraspidomorphi]
- Palaeosquilla [Stomatopoda]
- Palaeostaffella [Foraminifera]
- Palaeostauronema [Hexactinosa]
- Palaeosteus [Pteraspidomorphi]
- Palaeostoma [Palaeostomatidae]
- Palaeostomatopoda, order, Brooks 1962 [Malacostraca]
- Palaeostrophia, Ulridch and Cooper 1936 [Tetralobulidae]
- Palaeostrophomena, Holtedahl 1916 [Leptellinidae]
- Palaeotanais [Tanaidacea]
- Palaeotetraphyle [Spumellaria]
- Palaeotextularia [Palaeotextulariidae]
- Palaeothalomnus [Spumellaria]
- Palaeothea [Pycnogonida]
- Palaeothrissum, de Blainville 1818 [Palaeonisciformes]
- Palaeothunnus, Bannikov 1978 [Scombridae]
- Palaeotrimerella, Li and Han 1980 [Trimerellidae]
- Palaeotripus, Goodbody 1986 [Palaeoscenidiidae]
- Palaeotrochactaeon, Akopyan 1972 [Cephalaspida]
- Palaeotuba [Hydroida]
- Palaeoxanthopsis, Beurlen 1958 [Palaeoxanthopsidae]
- Palangaria, Mongin 1985 [Archaeogastropoda]
- Palaskensis [Nautilida]
- Palastraea, McCoy 1851 [Palaeosmiliidae]
- Palastreopora [Acroporidae]
- Paldiskites, Havlí?ek 1982 [Obolidae]
- Palelialia [Pseudonautilidae]
- Palella, Howell 1937 [Asaphida]
- Paleoalvania [Heterostrophia]
- Paleoalveolites, Okulitch 1935 [Paleoalveolitidae]
- Paleoatactoechus [Trepostomida]
- Paleocenosphaera [Problematica]
- Paleoconus, Flower and Gordon 1959 [Hematitidae]
- Paleocosta [Podocopida]
- Paleocythere [Ostracoda]
- Paleodictyoconus [Foraminifera]
- Paleofossus, Pokrovskaya 1959 [Edelsteinaspididae]
- Paleofusimitra, N. F. Sohl 1963 [Mitridae]
- Paleogaudryina [Foraminifera]
- Paleogrypophyllum, Ivaniya et al. 1968 [Ptenophyllidae]
- Paleolina [Sabelliditida]
- Paleomarcia [Cardiida]
- Paleomonsmirabilia [Podocopida]
- Paleonereites [Phyllodocemorpha]
- Paleononites [Eunicemorpha]
- Paleopatellina [Foraminifera]
- Paleopneustes, A. Agassiz 1873 [Paleopneustidae]
- Paleopolymorphina [Foraminifera]
- Paleopsephurus, A. MacAlpin 1947 [Polyodontidae]
- Paleopupa () [Onychochilidae]
- Paleosphaeronites, Prokop 1964 [Diploporita]
- Paleostraba [Nuculida]
- Paleoxiphosphaera [Problematica]
- Palermites, Toumansky 1937 [Adrianitidae]
- Paleschara [Fenestrata]
- Palhemiaster [Hemiasteridae]
- Palibacus, Forster 1984 [Scyllaridae]
- Palicites, Gemmellaro 1904 [Tibetitidae]
- Palintropus, Brodkorb 1970 [Quercymegapodiidae]
- Palinurina, Munster 1839 [Palinuridae]
- Palinurus, Weber 1795 [Palinuridae]
- Paliphyllum, Soshkina 1955 [Paliphyllidae]
- Paliurus [Serpulimorpha]
- Pallaimorphina [Foraminifera]
- Palliocypraea, Cossmann 1906 [Cypraeidae]
- Palliolatella, Patterson and Richardson 1987 [Ellipsolagenidae]
- Palliolum, Monterosato 1884 [Pectinidae]
- Palmadusta, Schilder 1939 [Cypraeidae]
- Palmatolepis, Müller 1956 [Palmatolepidae]
- Palmatophycus [Graptolithina]
- Palmenella [Podocopida]
- Palmeraspis, Repina 1973 [Trilobita]
- Palmerhytis [Chonopectidae]
- Palmericyathus, R.C. Handfield 1971 [Ajacicyathida]
- Palmerinella [Foraminifera]
- Palmerius [Cidaroida]
- Palmeroceras, Flower 1936 [Spyroceratidae]
- Palmerocrinus, Knapp 1969 [Catacrinidae]
- Palmicellaria, Alder 1864 [Celleporidae]
- Palmoconcha [Podocopida]
- Palmoxytoma [Oxytomidae]
- Palnerostephanus [Cephalopoda]
- Palocyathus, Filkorn 1994 [Turbinoliidae]
- Palomelon, Finlay 1927 [Volutidae]
- Palorbitolina [Orbitolinidae]
- Palorbitolinoides [Foraminifera]
- Palpebrops, Lieberman and Edgecombe 1991 [Calmoniidae]
- Paltaopites [Cephalopoda]
- Paltechioceras [Echioceratidae]
- Palurites [Eunicemorpha]
- Palus, Palmer 1928 [Hippuritida]
- Pamirina [Eostaffellidae]
- Pamirochaetetes [Tabulospongida]
- Pamirophyllum, Pyzhyanov 1971 [Durhaminidae]
- Pamiropora [Disjectoporidae]
- Pamirorhynchia [Basiliolidae]
- Pamiroseris, G. K. Melnikova 1971 [Pamiroseriidae]
- Pamirostroma [Axinellida]
- Pamirotellus, Balashova 1968 [Phacopida]
- Pamirothyris [Terebratulida]
- Pamirothyropsis [Boreiothyrididae]
- Pammegetherhynchus [Pugnacidae]
- Pamphagosirenites, Y. N. Popov 1961 [Trachyceratidae]
- Pampoecilorhynchus [Trigonirhynchiidae]
- Panarchaegonus [Proetida]
- Pancheilopora [Cheilostomata]
- Panchione, Olsson 1964 [Veneridae]
- Pancornus [Discosorida]
- Pandaglandulina [Nodosariidae]
- Pandanocrinus, P. A. Jell et al. 1988 [Monobathrida]
- Pandaspinapyga, Esker and Levin 1964 [Cheiruridae]
- Panderia, Volborth 1863 [Panderiidae]
- Panderia [Palaeocopida]
- Panderichthys [Coelacanthiformes]
- Panderina, Schuchert and Cooper 1931 [Productorthidae]
- Panderodus, Ethington 1959 [Panderodontidae]
- Pandora, Bruguière 1797 [Pandoridae]
- Pandoracrinus, Jaekel 1918 [Cladida]
- Pandorella, Conrad 1863 [Pandoridae]
- Pangoa, Marwick 1931 [Buccinidae]
- Panis, L. W. Stephenson 1953 [Bakevelliidae]
- Panitheca [Orthothecida]
- Pannellaina [Foraminifera]
- Panomya, Gray 1857 [Myoida]
- Panopea (Menard 1807) [Hiatellidae]
- Panopeus, H. Milne Edwards 1834 [Panopeidae]
- Panormella [Neogastropoda]
- Panormida, Senowbari-Daryan 1980 [Solenolmiidae]
- Pantanellium, Pessagno 1977 [Pantanelliidae]
- Pantellaria, Dall 1919 [Kraussinidae]
- Pantoioceras [Discosorida]
- Pantokratoria [Axinellida]
- Pantophilus [Enchodontidae]
- Pantophyllum [Anthozoa]
- Pantopoda, order, Gerstaecker 1863 [Pycnogonida]
- Pantosaurus, Marsh 1893 [Cryptoclididae]
- Panturichthys, Pellegrin 1913 [Anguilliformes]
- Panxinella, Lin 1974 [Corynexochida]
- Panxiosteus, Wang 1979 [Panxiosteidae]
- Paokannia, Ho and Lee 1959 [Redlichiida]
- Paoshanella, Yin 1937 [Coleolidae]
- Paphia, Röding 1798 [Veneridae]
- Paphies, Lesson 1831 [Mesodesmatidae]
- Papiliolinus [Monticuliferidae]
- Papiliophyllum, Stumm 1937 [Halliidae]
- Papillalunaria [Cystoporata]
- Papillatabairdia [Podocopida]
- Papillicardium, Sacco 1899 [Cardiidae]
- Papillina [Fasciolariidae]
- Papillocyathus [Ajacicyathida]
- Papillostrophia [Strophodontidae]
- Papodina [Terebratulida]
- Paprothites, Bartzsch and Weyer 1987 [Pseudarietitidae]
- Papyriaspis, Whitehouse 1939 [Ptychopariida]
- Papyridea, Swainson 1840 [Cardiidae]
- Paquettoceras, Foerste 1932 [Barrandoceratidae]
- Paquiericeras, Sayn 1901 [Neocomitidae]
- Paraacidaspis, Poletaeva 1960 [Lichakephalidae]
- Paraacrochordiceras [Ceratitida]
- Paraarctica [Cardiida]
- Paraaulina, Kuang 1977 [Lithostrotionidae]
- Parabactrites, Shimanskiy 1948 [Parabactritidae]
- Parabadiella, Chang 1966 [Abadiellidae]
- Parabailiella, Thoral 1946 [Conocoryphidae]
- Parabairdiacypris [Bairdiidae]
- Parabarrandia, Prantl and Pribyl 1949 [Nileidae]
- Parabasilicus, Kobayashi 1934 [Asaphidae]
- Parabathycheilus, Mergl 1984 [Ptychopariida]
- Parabelodina [Conodontophorida]
- Parabelopeltis, Naef 1921 [Teuthida]
- Parabelosteus [Arthrodira]
- Paraberounella [Berounellidae]
- Paraberriasella [Cephalopoda]
- Parabevahites, Collignon 1948 [Collignoniceratidae]
- Parabevalites [Cephalopoda]
- Parabifolium [Thecideidae]
- Parablackwelderia, Kobayashi 1942 [Damesellidae]
- Parablastoidea, order, Hudson 1907 [Pelmatozoa]
- Parabolbina [Palaeocopida]
- Paraboliceras [Neocomitidae]
- Paraboliceratoides [Neocomitidae]
- Parabolina, Salter 1849 [Olenidae]
- Parabolinella, Brögger 1882 [Olenidae]
- Parabolinites, Henningsmoen 1957 [Olenidae]
- Parabolinoides, Frederickson 1949 [Parabolinoididae]
- Parabolinopsis [Olenidae]
- Paraborsonia, Pilsbry 1922 [Turridae]
- Parabotryocrinus, Yakovlev 1941 [Cladida]
- Parabouchekius [Palaeocopida]
- Parabouleia, Eldredge 1972 [Calmoniidae]
- Parabournonia, Douvillé 1927 [Radiolitidae]
- Parabrachyelasma, Cherepnina 1960 [Streptelasmatidae]
- Parabrissus [Schizasteridae]
- Parabuchanosteus, White and Toombs 1972 [Arthrodira]
- Parabursacrinus, Wanner 1924 [Zeacrinitidae]
- Parabuxtonia [Productidae]
- Parabythocythere [Bythocytheridae]
- Paracadoceras [Cardioceratidae]
- Paracalamus, Arambourg 1927 [Perciformes]
- Paracaligella [Foraminifera]
- Paracalmonia, Struve 1958 [Calmoniidae]
- Paracalycoceras [Lyelliceratidae]
- Paracannia [Anthozoa]
- Paracanthodus [Protoconodontida]
- Paracanthoplites, Stoyanow 1949 [Deshayesitidae]
- Paracapillithyris [Capillithyrididae]
- Paracaprinula, Piveteau 1939 [Plagioptychidae]
- Paracarcinosoma [Eurypterida]
- Paracarinachites [Zhijinitidae]
- Paracarruthersella, Yoh 1961 [Geyerophyllidae]
- Paracassidulina [Foraminifera]
- Paracatillocrinus, Wanner 1916 [Catillocrinidae]
- Paracaudites [Podocopida]
- Paracavellina [Metacopida]
- Paracedaria, Duncan 1949 [Llanoaspididae]
- Paracenoceras, Spath 1927 [Paracenoceratidae]
- Paracentrophorus, Piveteau 1941 [Paracentrophoridae]
- Paraceratites, A. Hyatt 1900 [Ceratitidae]
- Paraceratitoides, A. Parnes 1975 [Hungaritidae]
- Paraceraurus, Männil 1958 [Cheiruridae]
- Paracerithium, Cossmann 1902 [Procerithiidae]
- Paracharnia [Rangeomorpha]
- Parachasmatopora [Fenestrata]
- Parachaunoproetus, Yuan 1988 [Proetida]
- Parachirognathus [Conodontophorida]
- Parachonetes [Strophochonetidae]
- Parachuangia, Qiu 1983 [Phacopida]
- Paracidaris [Cidaridae]
- Paracirculus [Archaeogastropoda]
- Paracladiscites, E. v. Mojsisovics 1896 [Cladiscitidae]
- Paraclathurella [Neogastropoda]
- Paraclausastraea, Zlatarski 1968 [Montlivaltiidae]
- Paracleistoceras, Foerste 1926 [Acleistoceratidae]
- Paraclidochirus [Sagenocrinida]
- Paraclimacograptus [Graptoloidea]
- Paraclythia, Fritsch and Kafka 1887 [Nephropidae]
- Paraclytiopsis, Oravec 1962 [Clytiopsidae]
- Paracodaster, Yakovlev 1940 [Fissiculata]
- Paracolocrinus, Brett 1980 [Crinoidea]
- Paracolumnaria [Anthozoa]
- Paracomatula, Hess 1950 [Paracomatulidae]
- Paracomitas, Powell 1942 [Turridae]
- Paracomminia [Neogastropoda]
- Paracomposita, Ding and Yao 1985 [Spiriferida]
- Paraconger, Kanazawa 1961 [Congridae]
- Paracongroides, Blot 1978 [Congridae]
- Paraconradoceras, Foerste 1926 [Nothoceratidae]
- Paraconularia [Conulariidae]
- Paracoosia, Kobayashi 1936 [Asaphida]
- Paracorbicula [Cardiida]
- Paracordylodus [Conodonta]
- Paracoroniceras, Spath 1922 [Arietitidae]
- Paracoscinus [Archaeocyathida]
- Paracoskinolina [Foraminifera]
- Paracosmetocrinus, Strimple 1967 [Cladida]
- Paracosta [Podocopida]
- Paracostanoplia, Xu 1977 [Spiriferida]
- Paracotylederma, Manni and Nicosia 1990 [Cyrtocrinida]
- Paracraniops, Williams 1963 [Craniopsidae]
- Paracraspedites [Polyptychitidae]
- Paracraticularia, Schrammen 1937 [Hexactinosa]
- Paracremacrinus, Brower 1977 [Crinoidea]
- Paracrescis [Cyclostomata]
- Paracrinoidea, class, Regnell 1945 [Paracrinozoa]
- Paracrioceras [Ancyloceratidae]
- Paracrocephalites, Poulsen 1954 [Ptychopariida]
- Paracrocrinus, Arendt and Stupachenko 1983 [Monobathrida]
- Paracromyocrinus, Strimple 1966 [Dendrocrinida]
- Paracrothyris [Stringocephalidae]
- Paracryphaeus, Gandl 1972 [Acastidae]
- Paractenoloculina [Palaeocopida]
- Paractinoceras, Hyatt in Zittel 1900 [Actinoceratidae]
- Paractocrinus [Crinoidea]
- Paracuariceras [Cephalopoda]
- Paracunnolites, Beauvais 1964 [Cunnolitidae]
- Paracyathus, Edwards and Haime 1848 [Caryophylliidae]
- Paracybantyx, Ludvigson and Tripp 1990 [Styginidae]
- Paracybeloides, Hupé 1955 [Encrinuridae]
- Paracyclammina [Foraminifera]
- Paracyclas, Hall 1843 [Mactromyidae]
- Paracyclendoceras [Endocerida]
- Paracyclostomiceras, Cecioni 1953 [Cyclostomiceratidae]
- Paracydonocrinus, Arendt 1970 [Cladida]
- Paracymatoceras, Spath 1927 [Nautilidae]
- Paracymatodus [Petalodontiformes]
- Paracymbiocrinus, Burdick and Strimple 1973 [Aesiocrinidae]
- Paracymbites [Oxynoticeratidae]
- Paracyprideis [Podocopida]
- Paracyprinotus [Podocopida]
- Paracypris [Paracyprididae]
- Paracystiphylloides, Tsien 1969 [Digonophyllidae]
- Paracystis, Sjöberg 1915 [Stephanoblastidae]
- Paracythere [Podocopida]
- Paracythereis [Podocopida]
- Paracytheretta [Podocopida]
- Paracytheridea, Muller 1894 [Paracytherideidae]
- Paracytherois [Podocopida]
- Paracytheroma [Podocopida]
- Paracytheromorpha [Podocopida]
- Paracytheropteron [Podocopida]
- Paradagmarita [Foraminifera]
- Paradainella [Foraminifera]
- Paradakeoceras [Ellesmerocerida]
- Paradanubites, A. A. Shevyrev 1968 [Danubitidae]
- Paradasyceras [Juraphyllitidae]
- Paradechenella, Richter 1912 [Proetida]
- Paradelocrinus, Moore and Plummer 1937 [Cladida]
- Paradelograptus [Dendroidea]
- Paradeltocyathus [Turbinoliidae]
- Paradeningeria, Senowbari-Daryan and Schäfer 1979 [Solenolmiidae]
- Paradentalium, Cotton and Godfrey 1933 [Dentaliidae]
- Paradiabolocrinus, Brower and Veinus 1974 [Diplobathrida]
- Paradiceras [Hippuritida]
- Paradichocrinus, Springer 1926 [Monobathrida]
- Paradicidia [Cephalopoda]
- Paradimeroceras, Bogoslovsky 1957 [Dimeroceratidae]
- Paradimorphoceras, Ruzhencev 1947 [Dimorphoceratidae]
- Paradinarites, Zhao 1950 [Columbitidae]
- Paradinobolus, Li and Han 1980 [Trimerellidae]
- Paradiscoceras [Tarphycerida]
- Paradisphyllum, Strusz 1965 [Disphyllidae]
- Paradistichites, C. Diener 1916 [Distichitidae]
- Paradistichophyllum, Melnikova 1975 [Reimaniphylliidae]
- Paradnatoceras [Orthocerida]
- Paradolerorthis [Hesperorthidae]
- Paradomatoceras, Delépine 1937 [Grypoceratidae]
- Paradonax [Donacidae]
- Paradoxaphyllia [Anthozoa]
- Paradoxechinus [Temnopleuridae]
- Paradoxia [Bivalvia]
- Paradoxides, Brongniart 1822 [Paradoxididae]
- Paradoxiella [Schubertellidae]
- Paradoxocrinus, Wanner 1937 [Crinoidea]
- Paradoxostoma [Podocopida]
- Paradrilla [Neogastropoda]
- Paradrilonereigenys [Phyllodocemorpha]
- Paradrydenius, Kazantseva-Selezneva 1980 [Palaeonisciformes]
- Paradunbarula [Foraminifera]
- Paraduplophyllum [Lophotichiidae]
- Paradygella [Terebratulida]
- Paraechinorhinus [Squaliformes]
- Paraechmina, Ulrich and Bassler 1923 [Aechminidae]
- Paraemanuella [Ambocoeliidae]
- Paraendoceras, Ulrich and Foerste 1936 [Proterocameroceratidae]
- Paraendothyra [Foraminifera]
- Paraenshia, Qiu 1983 [Ptychopariida]
- Paraeofusulina [Fusulinoidea]
- Paraeoleperditia, Adachi and Igo 1980 [Leperditicopida]
- Paraeoliscus, Blot 1981 [Paraeoliscidae]
- Paraeosoptychoparia, Qiu 1983 [Ptychopariida]
- Paraesa, Casey 1952 [Veneridae]
- Paraeucypris [Podocopida]
- Paraexophthalmocythere [Podocopida]
- Parafallotaspis, Fritz 1972 [Fallotaspididae]
- Parafavella [Spirotrichia]
- Parafenestalia [Fenestrata]
- Parafenestella [Fenestrata]
- Parafissurina, Parr 1947 [Ellipsolagenidae]
- Parafollicucullus, Holdsworth and Jones 1980 [Follicucullidae]
- Paraformichella, Qian and Zhang 1983 [Helcionelloida]
- Parafrithjofia, Yuan 1988 [Proetida]
- Parafrondicularia [Foraminifera]
- Parafusulinella [Foraminifera]
- Parafusus, B. Wade 1918 [Volutidae]
- Paragalathea, Patrulius 1959 [Galatheidae]
- Paragaleus, Budker 1935 [Hemigaleidae]
- Paragammarocrinites, Jager 1982 [Cyrtocrinida]
- Paragaricocrinus, Yakovlev 1934 [Monobathrida]
- Paragassizocrinus, Moore and Plummer 1940 [Agassizocrinidae]
- Paragattendorfia, Schindewolf 1924 [Prionoceratidae]
- Paragaudryina [Foraminifera]
- Paragazacrinus, Springer 1926 [Diplobathrida]
- Paraginglymostoma, Herman 1982 [Brachaeluridae]
- Paraglans, Chavan 1941 [Carditidae]
- Paraglauconia, Steinmann 1929 [Cassiopidae]
- Paraglobivalvulina [Biseriamminidae]
- Paraglobivalvulinoides [Foraminifera]
- Paragloborotalia [Foraminifera]
- Paraglossinulus [Uncinulidae]
- Paraglossograptus [Graptoloidea]
- Paraglycerites [Phyllodocemorpha]
- Paraglyptopleura [Palaeocopida]
- Paragnathites [Eunicemorpha]
- Paragoceras, G. v. Arthaber 1911 [Paragoceratidae]
- Paragogia [Eocrinidae]
- Paragonatodus, Kazantseva-Selezneva 1980 [Palaeonisciformes]
- Paragraphiocrinus, Wanner 1937 [Cladida]
- Paragraulos, Lu 1941 [Agraulidae]
- Paragrenocythere [Podocopida]
- Paragriffithides, Reed 1943 [Proetida]
- Paragymnites, A. Hyatt 1900 [Gymnitidae]
- Parahalobia [Pterioida]
- Parahalomitra, Wells 1937 [Fungiidae]
- Paraharpes, Whittington 1950 [Harpetidae]
- Parahastites [Belemnitida]
- Parahauerites, C. Diener 1916 [Klamathitidae]
- Parahealdia [Palaeocopida]
- Parahelicoprion [Agassizodontidae]
- Parahemingwayella [Podocopida]
- Parahemiptychina [Gillediidae]
- Paraheptranchias [Hexanchiformes]
- Paraheritschioides [Kleopatrinidae]
- Paraheteraster [Spatangoida]
- Parahexacrinus, Shevchenko 1967 [Monobathrida]
- Parahibolites [Belemnitida]
- Parahildaites [Hildoceratidae]
- Parahippa [Palaeocopida]
- Parahollinella [Amphissitidae]
- Parahomalonotus, Reed 1918 [Homalonotidae]
- Parahomoceras, Ruzhencev and Bogoslovskaya 1971 [Homoceratidae]
- Parahoplites, Anthula 1899 [Parahoplitidae]
- Parahsuum, Yao 1982 [Hsuidae]
- Parahughmillera [Eurypterida]
- Parahyolithes [Hyolithomorpha]
- Parainoceramus, Cox 1954 [Kolymiidae]
- Paraipciphyllum, Wu 1963 [Waagenophyllidae]
- Paraipichthys, Gaudant 1978 [Polymixiiformes]
- Parairvingella, Kobayashi 1938 [Ptychopariida]
- Parajaubertella, Matsumoto 1942 [Gaudryceratidae]
- Parajonesites [Palaeocopida]
- Parajuresania [Echinoconchidae]
- Parajuvavites, E. v. Mojsisovics 1896 [Haloritidae]
- Parakansuella [Monticuliferidae]
- Parakarpinskia [Karpinskiidae]
- Parakellnerites, H. Rieber 1973 [Ceratitidae]
- Parakidograptus [Graptoloidea]
- Parakingasidoides [Ptychopariida]
- Parakionoceras, Foerste 1928 [Arionoceratidae]
- Parakoldinia, Rozova 1960 [Cheilocephalidae]
- Parakorilithes [Hyolithida]
- Parakozlowskiella [Palaeocopida]
- Parakrithe [Podocopida]
- Parakrithella, Hanai 1959 [Podocopida]
- Parakunmingella, Chang 1974 [Archaeocopida]
- Paralabamina [Foraminifera]
- Paralaeospira [Serpulimorpha]
- Paralazutkinia [Theodossiidae]
- Paralbertella, Palmer 1969 [Zacanthoididae]
- Paralbula, Blake 1940 [Phyllodontidae]
- Paralcidia [Oppeliidae]
- Paraldingia, Richardson 1973 [Kingenidae]
- Paralegoceras, Hyatt 1884 [Schistoceratidae]
- Paralegoceras (Pericleites), Renz 1910 [Schistoceratidae]
- Paralejurus, Hawle and Corda 1847 [Styginidae]
- Paralenorthis, Havlicek and Branisa 1980 [Orthidae]
- Paralenticeras [Sphenodiscidae]
- Paraleperditia [Leperditicopida]
- Paralepis, Cuvier 1816 [Paralepididae]
- Paraleptostrophia [Leptostrophiidae]
- Paralevisia, Zhang and Jell 1987 [Corynexochida]
- Paralhederella [Cyclostomata]
- Paralichthys, Girard 1858 [Bothidae]
- Paralingulina [Ichthyolariidae]
- Paralioclema [Araxoporidae]
- Paralisaniella, Qiu 1983 [Corynexochida]
- Paralithostrotion, Gorskiy 1938 [Petalaxidae]
- Paralitogaster, Glaessner 1969 [Litogastroidae]
- Parallelelasma, Cooper 1956 [Parallelelasmatidae]
- Parallelopora, Bargatzky 1881 [Syringostromatidae]
- Parallelora [Spiriferidae]
- Parallelostroma, Nestor 1966 [Coenostromatidae]
- Paralleynia, Soshkina 1936 [Laccophyllidae]
- Paralogoniscus, Kazantseva-Selentseva 1981 [Palaeonisciformes]
- Paralorenzella, Zhang 1983 [Ptychopariida]
- Paraloxoceras, Flower 1939 [Pseudorthoceratidae]
- Paralucinella, Chavan 1951 [Lucinidae]
- Paralytoceras, Frech 1902 [Pseudarietitidae]
- Paralyttonia [Rigbyellidae]
- Paramalungia, Chang 1966 [Redlichiida]
- Paramammites, Furon 1935 [Acanthoceratidae]
- Paramansuyella, Endo 1937 [Asaphida]
- Paramarginatia [Productidae]
- Paramarginifera [Productellidae]
- Paramarria [Mimetasterida]
- Paramarshallena [Neogastropoda]
- Paramartesia [Myoida]
- Paramblypterus, Sauvage 1888 [Paramblypteriformes]
- Paramecynoceras [Discosorida]
- Paramegalaspis, Thoral 1935 [Asaphidae]
- Paramegaliocrinus, Arendt 1983 [Monobathrida]
- Paramegalodus [Hippuritida]
- Paramegateuthis, Gustomesov 1960 [Belemnitida]
- Paramelocrinus, Ubaghs 1958 [Monobathrida]
- Paramerista [Meristidae]
- Paramesolepis, Moy-Thomas and Dyne 1938 [Palaeonisciformes]
- Paramesolobus [Rugosochonetidae]
- Parametaria, Dall 1916 [Columbellidae]
- Paramicmacca, Lermontova 1951 [Ptychopariida]
- Paramicrocheilinella [Podocopida]
- Paramixogonaria [Anthozoa]
- Parammatoceras [Hammatoceratidae]
- Paramoelleritia [Leperditicopida]
- Paramoltkia [Gorgonacea]
- Paramonopleura [Hippuritida]
- Paramooreoceras [Orthocerida]
- Paramorea, B. Wade 1917 [Pholidotomidae]
- Paramphicrinus, H.L. Strimple and R.C. Moore 1971 [Euryocrinidae]
- Paramphisile, Blot 1981 [Centriscidae]
- Paramplexoides, He 1978 [Streptelasmatidae]
- Paramuirwoodia [Productidae]
- Paramunseyella [Podocopida]
- Paramya [Myidae]
- Paramylostoma [Arthrodira]
- Paramysis [Mysidacea]
- Paranacyathus [Archaeocyathida]
- Paranacystis [Mitrata]
- Paranaia [Meganterididae]
- Parananlingella [Foraminifera]
- Paranassa [Nassariidae]
- Paranautilus, Mojsisovics 1902 [Liroceratidae]
- Paranclyoceras [Cephalopoda]
- Parandiceras, Spath 1939 [Neocomitidae]
- Paranditrigonia [Trigoniida]
- Paranecrocarcinus, Van Straelen 1936 [Necrocarcinidae]
- Paraneistrolepis [Neogastropoda]
- Paranereites [Phyllodocemorpha]
- Paranesidea [Podocopida]
- Parangarenga [Neogastropoda]
- Paranguilla, Bleeker 1864 [Paranguillidae]
- Parangularia, Kutassy 1937 [Purpurinidae]
- Paranicklespora [Cryptostomata]
- Paranisocrinus [Sagenocrinida]
- Paranisopleurella [Sowerbyellidae]
- Paranogmius [Crossognathiformes]
- Paranomia, Conrad 1860 [Anomiidae]
- Paranomotodon, Herman 1975 [Lamniformes]
- Paranoritoides [Ceratitida]
- Paranorwoodia, Rasetti 1945 [Norwoodiidae]
- Paranotacythere [Podocopida]
- Paranothosaurus, Peyer 1939 [Nothosauridae]
- Paranoviportia [Palaeocopida]
- Paranowakia, B. Boucek 1964 [Paranowakiidae]
- Paranumia [Ptychopariida]
- Paraolenoides, Ivshin 1952 [Corynexochida]
- Paraolenus, Lermontova 1951 [Ptychopariida]
- Paraoliganisus [Palaeocopida]
- Paraoligorhyncha [Oligorhynchiidae]
- Paraophthalmidium [Ophthalmidiidae]
- Paraorlovia, Chernysheva 1956 [Asaphiscidae]
- Paraorthacodus, Glikman 1957 [Paleospinacidae]
- Paraorthograptus [Graptoloidea]
- Paraostenia [Conchyliocarida]
- Parapachyaspis, Qiu 1983 [Ptychopariida]
- Parapachytraga [Pholadomyida]
- Parapagetia, Repina 1964 [Agnostida]
- Parapalaeoceras [Ellesmerocerida]
- Parapalebralia [Proetida]
- Parapallasiceras [Ataxioceratidae]
- Parapaltodus [Conodontophorida]
- Paraparchitella [Paraparchitidae]
- Paraparchites, E. O. Ulrich and Bassler 1906 [Paraparchitidae]
- Parapassaloteuthis [Passaloteuthididae]
- Parapatoceras [Parkinsoniidae]
- Parapeishania, Qiu 1983 [Ptychopariida]
- Parapeltoceras [Aspidoceratidae]
- Parapercis, Bleeker 1963 [Perciformes]
- Paraperiomma, Zhou 1974 [Ptychopariidae]
- Parapernerocrinus, Yakovlev 1949 [Cladida]
- Paraperrinites, Toumansky 1939 [Perrinitidae]
- Parapetalolithis [Graptoloidea]
- Paraphaseolella, Tong 1987 [Archaeocopida]
- Paraphillipsinella [Asaphida]
- Paraphillipsinella, Lu and Chang 1974 [Styginidae]
- Parapholas, Conrad 1848 [Pholadidae]
- Parapholidophorus [Pholidophoridae]
- Paraphorhynchus [Rhynchotetradidae]
- Paraphragmites, Flower 1943 [Paraphragmitidae]
- Paraphtonia, Khalfin 1958 [Lipanellidae]
- Paraphyllites, Hyatt 1900 [Agoniatitidae]
- Paraphyllogyra, Beauvais 1970 [Montlivaltiidae]
- Parapilekia, Kobayashi 1934 [Pilekiidae]
- Parapiloceras, Obata 1939 [Piloceratidae]
- Parapinacoceras, C. Diener 1916 [Gymnitidae]
- Parapinnixa [Decapoda]
- Parapirimela, Van Straelen 1937 [Pirimelidae]
- Parapisocrinus, E-z. Mu 1954 [Pisocrinidae]
- Paraplacites, Oravecz 1962 [Gymnitidae]
- Paraplacocoenia, Beauvais 1982 [Placocoeniidae]
- Paraplacodus, Peyer 1931 [Paraplacodontidae]
- Paraplacuna, Oppenheim 1892 [Anomiidae]
- Paraplagiura, Zhang 1983 [Trilobita]
- Paraplagusia, Bleeker 1865 [Pleuronectiformes]
- Paraplasocrinus, Moore and Plummer 1937 [Cladida]
- Paraplatax, Bogatchev 1938 [Perciformes]
- Paraplatyrhomboides [Beecherellidae]
- Paraplatythyris [Capillithyrididae]
- Paraplectograptus [Retiolitidae]
- Paraplectogyra [Foraminifera]
- Paraplectronoceras [Ellesmerocerida]
- Paraplegmatograptus, Mu and Lin 1984 [Graptoloidea]
- Paraplesiobatis, Broili 1933 [Paraplesiobatidae]
- Paraplesiograulos [Trilobita]
- Paraplesioteuthis [Teuthida]
- Paraplethopeltis, Bridge and Cloud 1947 [Proetida]
- Parapleuropholis [Pachycormiformes]
- Paraplicanoplia, Xu 1977 [Spiriferida]
- Parapodocapsa, Steiger 1992 [Syringocapsidae]
- Parapoliella, Shernysheva 1956 [Dolichometopidae]
- Parapolytremacis, Alloiteau 1957 [Helioporidae]
- Parapopanoceras, Haug 1894 [Parapopanoceratidae]
- Parapribylites [Palaeocopida]
- Paraprimitia [Palaeocopida]
- Paraprionodus [Conodontophorida]
- Parapristipoma, Bleeker 1873 [Perciformes]
- Paraprothyris [Pholadomyida]
- Paraptychopyge, Balashova 1964 [Asaphidae]
- Parapugnax [Pugnacidae]
- Parapunctella, Luo and Jiang 1982 [Halkieriidae]
- Parapuractaeon [Cephalaspida]
- Parapuzosia, Nowak 1913 [Desmoceratidae]
- Parapygaeus, Pellegrin 1907 [Perciformes]
- Parapygus [Echinolampadidae]
- Parapyxion [Palaeocopida]
- Paraquadrithyris [Reticulariidae]
- Pararachnastraea [Anthozoa]
- Pararaia, Kobayashi 1942 [Estaingiidae]
- Pararania [Trilobita]
- Pararaphispira, Qiao 1983 [Archaeogastropoda]
- Pararasenia [Perisphinctidae]
- Pararcestes, E. v. Mojsisovics 1893 [Arcestidae]
- Parareichelina, Miklukho-Maclay 1959 [Staffellidae]
- Pararenicola [Problematica]
- Parareticularia [Reticulariidae]
- Pararetiograptus [Graptoloidea]
- Pararhactorhynchia, Shi 1990 [Cyclothyrididae]
- Pararhenanoperca, Micklich and Wuttke 1988 [Perciformes]
- Pararhincodon, Herman 1975 [Orectolobiformes]
- Pararhynchospirina [Spiriferida]
- Pararineceras, Turner 1954 [Trigonoceratidae]
- Parariscus [Podocopida]
- Pararnioceras [Arietitidae]
- Pararotalia [Rotaliidae]
- Parasabellidites [Sabelliditida]
- Parasageceras, O. Welter 1915 [Sageceratidae]
- Parasajanaspis, Chernysheva 1972 [Redlichiida]
- Parasalenia [Parasaleniidae]
- Parasarcinula, Sokolov and Tesakov 1963 [Syringophyllidae]
- Parasaturnalis [Parasaturnalidae]
- Parasauvagesia [Hippuritida]
- Parasaynoceras, Breistroffer 1947 [Holcodiscidae]
- Parascenella [Mollusca]
- Paraschizocythere [Podocopida]
- Paraschmidtella [Palaeocopida]
- Paraschuleridea [Podocopida]
- Paraschwagerina [Schwagerinidae]
- Paraschwagerina (Acervoschwagerina), Hanzawa 1949 [Schwagerinidae]
- Parascoceras, Miller 1932 [Ascoceratidae]
- Parascopelus [Actinopterygii]
- Parascytalocrinus, Kamm and Ausi 1993 [Cladida]
- Parasemionotus, Piveteau 1929 [Parasemionotidae]
- Paraserratognathus [Conodontophorida]
- Parashergoldopsis [Ostracoda]
- Parashivaella [Palaeocopida]
- Parashumardites, Ruzhencev 1939 [Parashumarditidae]
- Parasibirites, Y. N. Popov 1962 [Sibiritidae]
- Parasimplotyxis [Heterostrophia]
- Parasiphonophyllia [Anthozoa]
- Parasleia [Palaeocopida]
- Parasmilia, Milne-Edwards and Haime 1848 [Caryophylliidae]
- Parasmittina [Smittinidae]
- Parasociophyllum, Kong 1978 [Stringophyllidae]
- Parasolenoceras, Collignon 1969 [Diplomoceratidae]
- Parasolenopleura, Westergard 1953 [Ptychopariida]
- Parasolia [Medusae]
- Parasorites [Soritidae]
- Paraspelaeum, Schrammen 1924 [Siphoniidae]
- Parasphaerorthoceras, Ristedt 1968 [Sphaerorthoceratidae]
- Parasphyraena, Switchenska 1968 [Perciformes]
- Paraspidites [Proptychitidae]
- Paraspidoceras [Aspidoceratidae]
- Paraspirifer [Hysterolitidae]
- Paraspiticeras [Cephalopoda]
- Parasquatina, Herman 1982 [Chondrichthyes]
- Parastachyocrinus, Wanner 1949 [Cladida]
- Parastarte, Conrad 1862 [Veneridae]
- Parastauria, He and Lee 1974 [Stauriidae]
- Parastegnammina [Foraminifera]
- Parastelliporella, Lin and Chow 1977 [Stelliporellidae]
- Parastephanocrinus, Springer 1926 [Cladida]
- Parasterbergella [Podocopida]
- Parasterophrentis [Anthozoa]
- Parastieria [Cephalopoda]
- Parastrenoceras [Stephanoceratidae]
- Parastriatopora, Sokolov 1949 [Parastriatoporidae]
- Parastriatoporella, Chudinova 1959 [Pachyporidae]
- Parastringocephalus [Stringocephalidae]
- Parastroma, Douvillé 1926 [Hippuritidae]
- Parastromatopora, Yabe and Sugiyama 1935 [Milleporellidae]
- Parastrophinella, Schuchert and Cooper 1931 [Parastrophinidae]
- Parastrophonella [Douvillinidae]
- Parastylonurus [Parastylonuridae]
- Parasycocrinus, Oyens 1940 [Cladida]
- Parasynarcualis, Blot 1981 [Parasynarcualidae]
- Parasynastraea, Alloiteau 1957 [Acrosmiliidae]
- Parasyngenochilus, Long 1981 [Neogastropoda]
- Parasyrinx, Finlay 1924 [Turridae]
- Parasyrinx (Lirasyrinx), Powell 1942 [Turridae]
- Paratalarocrinus, Strimple and Coney 1978 [Monobathrida]
- Paratancredia [Cardiida]
- Parataphrus [Archaeogastropoda]
- Paratarpon, D. Bardack 1970 [Elopidae]
- Parataxodonta [Podocopida]
- Paratemnograptus [Dendroidea]
- Paraterebella [Terebellomorpha]
- Paratermierella, Hupe 1952 [Ptychopariida]
- Paratetradium, Sokolov 1955 [Tetradiidae]
- Paratetratomia [Rhynchonellida]
- Parateudopsis [Teuthida]
- Paratexanites [Collignoniceratidae]
- Paratextularia [Foraminifera]
- Parathecidea [Thecideidae]
- Parathetidites, E. T. Tozer 1971 [Thetiditidae]
- Parathisbites, E. v. Mojsisovics 1893 [Parathisbitidae]
- Parathurammina [Parathuramminidae]
- Parathuramminites [Foraminifera]
- Parathyasira, Iredale 1930 [Thyasiridae]
- Parathyrisina [Athyrididae]
- Parathysanophyllum [Anthozoa]
- Paratibites [Ceratitida]
- Paratichthys [Gadiformes]
- Paratikhinella [Paratikhinellidae]
- Paratimorocidaris, Arendt 1981 [Cladida]
- Paratissotia [Tissotiidae]
- Paratorleyoceras, Bogoslovsky 1957 [Cheiloceratidae]
- Paratornoceras, Hyatt 1900 [Dimeroceratidae]
- Paratrachinotus, Blot 1969 [Carangidae]
- Paratrachyceras, G. v. Arthaber 1914 [Trachyceratidae]
- Paratrachytoechus [Trepostomida]
- Paratrematoceras, Schastlivtseva 1981 [Cephalopoda]
- Paratreta, Biernat 1973 [Torynelasmatidae]
- Paratretaspis, Dean 1973 [Ptychopariida]
- Paratretocycloecia [Cyclostomata]
- Paratriakis [Carchariniformes]
- Paratriasina [Foraminifera]
- Paratribonium [Stenoscismatidae]
- Paratrilobita, class [Arthropoda]
- Paratrinucleus, Whittington 1941 [Asaphida]
- Paratrisopterus, Fedotov 1971 [Gadiformes]
- Paratrochamminoides [Lituotubidae]
- Paratrophon, Finlay 1926 [Neogastropoda]
- Paratsunyiella [Ostracoda]
- Paratungusella, Repina 1964 [Redlichiida]
- Paraturbo, Cossmann 1907 [Paraturbinidae]
- Paraturrilites, Breistroffer 1947 [Turrilitidae]
- Paratymolus [Decapoda]
- Paratzuchiatocnemis, Wu and Xia 1990 [Phacopida]
- Paraucellina [Pterioida]
- Paraungerella [Myodocopida]
- Paravaginoceras, Kobayashi 1934 [Cephalopoda]
- Paravesicocaulis, Kovacs 1978 [Celyphiidae]
- Paravinciguerria, Arambourg 1955 [Stomiatiformes]
- Paravinella [Cheilostomata]
- Paravirgatites [Cephalopoda]
- Paraviviana, Kutassy 1940 [Helicotomidae]
- Paravulvulina [Foraminifera]
- Parawarburgella, Maksimova 1975 [Proetida]
- Parawedekindellina, Safonova 1951 [Fusulinoidea]
- Parawedekindia [Aspidoceratidae]
- Parawentzellophyllum, Yü 1977 [Kepingophyllidae]
- Parawestonoceras [Discosorida]
- Parawocklumeria, Schindewolf 1926 [Parawocklumeriidae]
- Parayakutoceras, Popov 1970 [Orulganitidae]
- Parazeacrinites, Burdick and Strimple 1971 [Cladida]
- Parazebinella (Boettger 1893) [Neotaenioglossa]
- Parazolophyllia [Anthozoa]
- Parazonophyllum, Kong 1978 [Digonophyllidae]
- Parazophocrinus, Strimple 1963 [Crinoidea]
- Parazyga [Parazygidae]
- Parazygograptus [Graptoloidea]
- Pardailhania, Thoral 1947 [Ptychopariida]
- Parechelus, Casier 1967 [Anguilliformes]
- Paredriophus [Edrioasterida]
- Parehmania, Deiss 1939 [Alokistocaridae]
- Parellisina [Calloporidae]
- Parentactinia, Dumitrica 1978 [Palaeoscenidiidae]
- Parenthatia, Kay 1940 [Bolliidae]
- Parentites, Bogoslovsky 1961 [Auguritidae]
- Pareocrinus, Yakovlev 1956 [Ascocystitida]
- Pareops [Redlichiida]
- Pareora, Marwick 1931 [Turritellidae]
- Paretallonia, Sikharulidze 1972 [Acroporidae]
- Parethelocrinus, Strimple 1961 [Dendrocrinida]
- Parethmophyllum [Ajacicyathida]
- Parevenkaspis, Kramerenko 1952 [Pterygometopidae]
- Parevlanoceras [Discosorida]
- Pareynia, Semenoff-Tian-Chansky 1974 [Axophyllidae]
- Parhabdocidaris [Cidaridae]
- Pariceratina [Podocopida]
- Parichthyocrinus, Springer 1902 [Taxocrinida]
- Pariconchoprimitia [Palaeocopida]
- Parietiplicatum, N. F. Sohl 1963 [Acteoninidae]
- Parillaenus, Jaanusson 1954 [Illaenidae]
- Parindocrinus, Wanner 1937 [Cladida]
- Parinodiceras [Polymorphitidae]
- Parinotus [Neogastropoda]
- Parinvolutina [Robuloididae]
- Pariocrinus, Eckert 1984 [Crinoidea]
- Pariphiculus, Alcock 1896 [Iphiculidae]
- Parisangulocrinus, Schmidt 1934 [Cladida]
- Parisiella [Cardiida]
- Parisis [Gorgonacea]
- Parisoceraurus, Zhou 1977 [Cheiruridae]
- Parisochitina [Rhizopodea]
- Parisocrinus, Wachsmuth and Springer 1880 [Cladida]
- Parkaspis, Rasetti 1951 [Zacanthoididae]
- Parkeria, Carpenter 1870 [Sphaeractinida]
- Parkesolithus, Campbell and Durham 1970 [Trinucleidae]
- Parkinsonia [Parkinsoniidae]
- Parksia [Axinellida]
- Parleiosoecia [Cyclostomata]
- Parleria [Hydroida]
- Parmephrix [Chonopectidae]
- Parmicorbula, H. E. Vokes 1944 [Corbulidae]
- Parmophorella [Scenellidae]
- Parmorthina [Dalmanellidae]
- Parmorthis [Dalmanellidae]
- Parmula [Lissatrypidae]
- Parmularia [Schizoporellidae]
- Parmulechinus [Scutellidae]
- Parobeisselina [Cheilostomata]
- Parodiceras, Hyatt 1884 [Parodoceratidae]
- Parodontoceras [Himalayitidae]
- Paroistodus [Conodontophorida]
- Paromalomena, Rong 1984 [Glyptomenidae]
- Paromoeopygma [Pugnacidae]
- Paronaella, Pessagno 1971 [Angulobracchiidae]
- Paronaria [Sphaeractinida]
- Paronaster [Holasteridae]
- Paronastraea, Beauvais 1977 [Heterocoeniidae]
- Paronella, Wiontzek 1934 [Radiolitidae]
- Paroniceras [Hildoceratidae]
- Paroocerina, Zhuravleva 1961 [Oncoceratidae]
- Parophrys, Girard 1856 [Pleuronectiformes]
- Paropsites [Astrophorida]
- Paropsonema [Siphonophorida]
- Parormoceras, Shimizu and Obata 1935 [Ormoceratidae]
- Parorthocrinus [Crinoidea]
- Parospinus, Gayet 1982 [Beryciformes]
- Parotodus, Cappetta 1980 [Lamnidae]
- Paroxynoticeras [Oxynoticeratidae]
- Parphia [Foraminifera]
- Parphores [Palaeocopida]
- Parrellina, Thalmann 1951 [Elphdiidae]
- Parrelloides [Foraminifera]
- Parribacus, Dana 1852 [Scyllaridae]
- Parryoceras, Sweet and Miller 1957 [Cyrtogomphoceratidae]
- Parsimonia [Serpulidae]
- Partanosaurus, Skuphos 1893 [Nothosauria]
- Parthenina, Bucquoy et al. 1883 [Pyramidellidae]
- Parthenope, Weber 1795 [Parthenopidae]
- Parthirhynchia [Basiliolidae]
- Particeps, Reed 1943 [Proetida]
- Particoma [Myoida]
- Partisania [Partisaniidae]
- Partretocycloecia [Cyclostomata]
- Partschiceras, Fucini 1920 [Phylloceratidae]
- Partubiola [Archaeogastropoda]
- Partulida [Heterostrophia]
- Parulocrinus, Moore and Plummer 1940 [Dendrocrinida]
- Parulrichia [Palaeocopida]
- Parunicinella [Spiriferida]
- Parurgonina [Foraminifera]
- Parussuria, L. F. Spath 1934 [Ussuriidae]
- Parutahconus [Conodontophorida]
- Paruvanella [Calcarea]
- Parvacmea, Iredale 1915 [Patellogastropoda]
- Parvacythereis [Podocopida]
- Parvalanapila, MacDonald 1998 [Pseudorotasphaeridae]
- Parvaltissimarostrum [Petasmariidae]
- Parvancorina, M. F. Glaessner 1958 [Bilateralomorpha]
- Parvaxon [Anthozoa]
- Parvicardium, Monterosato 1884 [Cardiidae]
- Parvicingula, Pessagno 1977 [Parvicingulidae]
- Parvicuspis, Pessagno 1972 [Phaseliformidae]
- Parvilux, Hubbs and Wisner 1964 [Myctophiformes]
- Parvimitra [Volutomitridae]
- Parvirota [Archaeogastropoda]
- Parviscala, de Boury 1887 [Epitoniidae]
- Parvisetia [Seguenziidae]
- Parvithracia [Pholadomyida]
- Parvitubus [Tuboidea]
- Parvivenus [Cardiida]
- Parviviana [Archaeogastropoda]
- Parvivoluta, B. Wade 1926 [Volutidae]
- Parvochlamys [Pterioida]
- Parvohallopora, Singh 1979 [Halloporidae]
- Parvularugoglobigerina [Foraminifera]
- Parvulites, Ljaschenko 1969 [Turmalitidae]
- Paryfenus [Proetida]
- Paryphoceras [Sphaeroceratidae]
- Paryphorhynchopora [Rhynchonellida]
- Pasaichthys, Blot 1969 [Perciformes]
- Pascoeites [Cephalopoda]
- Pasitheola, Cossmann 1896 [Iravadiidae]
- Paskentites [Cephalopoda]
- Passalocrinus [Crinoidea]
- Passaloteuthis [Passaloteuthididae]
- Passya [Cardiida]
- Pasternakevia, Selden and Drygant 1987 [Planaterga]
- Pastrikella [Meandropsinidae]
- Pasythea [Pasytheidae]
- Patagoc