ammonites

Taxonomic names from R. L. Carroll 1988

  • Ablepharus, Lichtenstein 1823 [Scincidae]
  • Aboletylestes, D. E. Russell 1964 [Palaeoryctidae]
  • Abrocomidae, family, Miller and Gidley 1918 [Rodentia]
  • Acamana, Simpson et al. 1962 [Notoungulata]
  • Acanthodidae, family [Acanthodiformes]
  • Acanthopholis, T. H. Huxley 1867 [Reptilia]
  • Acanthostega, Jarvik 1952 [Acanthostegidae]
  • Acanthostegidae, family, Jarvik 1952 [Ichthyostegalia]
  • Accipitridae, family, Viellot 1816 [Falconiformes]
  • Acerosodontosauridae, family [Eosuchia]
  • Acherontiscidae, family, Carroll 1967 [Lepospondyli]
  • Acherontiscus, Carroll 1969 [Acherontiscidae]
  • Aciprion, E. D. Cope 1873 [Iguanidae]
  • Acoelohyrax, Ameghino 1902 [Archaeohyracidae]
  • Acotherulum, P. Gervais 1850 [Cebochoeridae]
  • Acris, Dumeril and Bibron 1841 [Hylidae]
  • Acrochordidae, family, Bonaparte 1840 [Ophidia]
  • Acrodelphidae, family, O. Abel 1905 [Cetacea]
  • Acropithecus, F. Ameghino 1903 [Archaeopithecidae]
  • Acroplous, Hotton 1959 [Saurerpetontidae]
  • Acrotitan, Ye 1983 [Brontotheriidae]
  • Actinodon, Gaudry 1867 [Eryopidae]
  • Actiobates, Eaton 1973 [Trematopidae]
  • Adamisaurus, A. Sulimski 1972 [Teiidae]
  • Adapidae, family, E. L. Trouessart 1879 [Primates]
  • Adapidium, C. C. Young 1937 [Esthonychidae]
  • Adapiformes, infraorder, Hoffstetter 1977 [Primates]
  • Adapisorex, Lemoine 1883 [Adapisoricidae]
  • Adapisoriculus, Lemoine 1885 [Adapisoriculidae]
  • Adelogyrinidae, family, Brough and Brough 1967 [Lepospondyli]
  • Adelogyrinus, Watson 1928 [Lepospondyli]
  • Adelospondylus, Carroll 1967 [Adelogyrinidae]
  • Adianthidae, family, Ameghino 1891 [Litopterna]
  • Adianthus, F. Ameghino 1891 [Macraucheniidae]
  • Adiantoides, G. S. Simpson and J. L. Minoprio 1949 [Macraucheniidae]
  • Adinotherium, F. Ameghino 1887 [Toxodontidae]
  • Admetophoneus, Efremov 1954 [Brithopodidae]
  • Adracon, Filhol 1884 [Carnivora]
  • Aegialornis, R. Lydekker 1891 [Aegialornithidae]
  • Aegialornithidae, family, R. Lydekker 1891 [Apodiformes]
  • Aegothelidae, family [Caprimulgiformes]
  • Aelurogale, Filhol 1872 [Nimravidae]
  • Aelurognathus, Haughton 1924 [Gorgonopsidae]
  • Aeluroidea, superfamily, Flower 1869 [Carnivora]
  • Aeluropsis, Lydekker 1884 [Felidae]
  • Aepisaurus, P. Gervais 1852 [Anchisauria]
  • Aepyceros, Sundevall 1847 [Bovidae]
  • Aepyornis, Geoffroy 1850 [Aepyornithidae]
  • Aepyornithidae, family, Bonaparte 1853 [Aepyornithiformes]
  • Aepyornithiformes, order [Reptilia]
  • Aethia, Merrem 1788 [Alcidae]
  • Aetosauria, suborder, R. Lydekker 1889 [Aetosauria]
  • Aetosaurus, O. Fraas 1887 [Aetosaurinae]
  • Afrocyon, Arambourg 1961 [Amphicyonidae]
  • Afrosmilus, Kretzoi 1929 [Barbourofelidae]
  • Agama, Daudin 1802 [Agamidae]
  • Agamidae, family, Gray 1827 [Squamata]
  • Agnotherium, Kaup 1932 [Amphicyonidae]
  • Agomphus, E. D. Cope 1871 [Testudines]
  • Agriochoeridae, family, Leidy 1869 [Ruminantia]
  • Aigialosauridae, family, K. G. Kramberger 1892 [Squamata]
  • Ailuravus, L. Rütimeyer 1891 [Ischyromyidae]
  • Ailurictis, Trouessart 1899 [Mustelidae]
  • Ailuropoda, A. Milne-Edwards 1870 [Ursidae]
  • Akanthosuchus, F. M. O'Neill et al. 1981 [Reptilia]
  • Akidnognathus, Haughton 1918 [Moschorhinidae]
  • Akrochelys, Bergounioux 1935 [Carettochelyidae]
  • Aksyiria, Gabunia 1973 [Suiformes]
  • Alaudidae, family [Passeriformes]
  • Albanohyus, L. Ginsburg 1974 [Tayassuidae]
  • Albertogaudryia [Trigonostylopidae]
  • Alcedinidae, family, Rafinesque 1815 [Coraciiformes]
  • Alcelaphus, Blainville 1816 [Bovidae]
  • Alcidae, family, Leach 1820 [Charadriiformes]
  • Alegeinosaurus, Case 1911 [Dissorophidae]
  • Alitoxodon, Rovereto 1914 [Toxodontidae]
  • Allacerops, Wood 1932 [Hyracodontidae]
  • Allaeochelys, Noulet 1867 [Carettochelyidae]
  • Allalmeia, Rusconi 1946 [Oldfieldthomasiidae]
  • Alle, Link 1806 [Alcidae]
  • Allictops, Qiu 1977 [Pseudictopidae]
  • Alligator, Daudin 1809 [Alligatoridae]
  • Alligatorellus, Gervais 1871 [Neosuchia]
  • Alligatoridae, family, Gray 1844 [Reptilia]
  • Allodaposuchus, Nopcsa 1928 [Eusuchia]
  • Allosorex, O. Fejfar 1966 [Allosoricini]
  • Allostylops, Zheng 1979 [Arctostylopidae]
  • Almasauridae, family, Dutuit 1972 [Trematosauroidea]
  • Almasauroidea, superfamily [Temnospondyli]
  • Almogaver, Crusafont-Pairo and Villalta 1954 [Phenacodontidae]
  • Alsaticopithecus, J. Hürzeler 1947 [Amphilemuridae]
  • Altilambda, Chow and Wang 1978 [Pastoralodontidae]
  • Ambiortidae, family, Kurochkin 1982 [Ambiortiformes]
  • Ambiortus, Kurochkin 1982 [Reptilia]
  • Amblycoptus, Kormos 1926 [Soricidae]
  • Amblysomus, Pomel 1848 [Chrysochloridae]
  • Ambystoma, Tschudi 1838 [Ambystomatidae]
  • Ambystomatidae, family, Hallowell 1856 [Ambystomatoidea]
  • Ambystomatoidea, suborder [Urodela]
  • Ambystomichnus, Peabody 1954 [Dicamptodontidae]
  • Ameghinornis, Mourer-Chauvire 1981 [Phorusrhacidae]
  • Ameiseophis, J. A. Holman 1976 [Colubridae]
  • Ameiva, Meyer 1795 [Teiidae]
  • Ammodramus, Swainson 1827 [Fringillidae]
  • Amphibamus, Cope 1865 [Amphibamidae]
  • Amphicticeps, Matthew and Granger 1924 [Carnivora]
  • Amphictis, Pomel 1853 [Procyonidae]
  • Amphicyanis, Springhorn 1977 [Amphicyonidae]
  • Amphicyonidae, family, Haeckel 1886 [Carnivora]
  • Amphilestinae, subfamily, H. F. Osborn 1888 [Eutriconodonta]
  • Amphimerycidae, family, Stehlin 1910 [Tylopoda]
  • Amphimoschus, Gray 1852 [Ruminantia]
  • Amphipelargus, Lydekker 1891 [Ergilornithidae]
  • Amphiperatherium, H. Filhol 1879 [Herpetotheriidae]
  • Amphiprox, Kaup 1839 [Cervoidea]
  • Amphisbaenidae, family, Gray 1865 [Squamata]
  • Amphisorex, Duvernoy 1835 [Soricidae]
  • Amphitheriidae, family, R. Owen 1846 [Amphitheria]
  • Amphitragulus, Pomel 1847 [Palaeomerycidae]
  • Amphitriton, Rogers 1976 [Ambystomatidae]
  • Amphiuma, Garden 1821 [Amphiumidae]
  • Amphiumidae, family, Gray 1825 [Urodela]
  • Amphiumoidea, suborder [Urodela]
  • Amynodontidae, family, Scott and Osborn 1883 [Perissodactyla]
  • Anagale, G.G. Simpson 1931 [Anagalidae]
  • Anagalidae, family, G.G. Simpson 1931 [Anagalida]
  • Anagalopsis, Bohlin 1951 [Anagalidae]
  • Analcimorphus, F. Ameghino 1891 [Prepotheridae]
  • Analcitherium, F. Ameghino 1891 [Mylodontidae]
  • Anaptogale, Xu 1976 [Anagalidae]
  • Anaspida, subclass (S. W. Williston 1917) [Sauropsida]
  • Anatidae, family, Vigors 1825 [Anseriformes]
  • Anatolictis, N. Schmidt-Kittler 1976 [Mustelidae]
  • Ancylocoelus, Ameghino 1895 [Leontiniidae]
  • Ancylotherium, Gaudry 1863 [Chalicotheriidae]
  • Andalgalornis, Patterson and Kraglievich 1960 [Phorusrhacidae]
  • Andrewsornis, Patterson 1941 [Phorusrhacidae]
  • Andrias, Tschudi 1837 [Cryptobranchidae]
  • Aneides, Baird 1849 [Plethodontidae]
  • Anguidae, family, J. E. Gray 1825 [Squamata]
  • Anguoidea, superfamily [Squamata]
  • Anhimidae, family, Stejneger 1885 [Anseriformes]
  • Anhinga, Brisson 1760 [Anhingidae]
  • Anhingidae, family, Ridgway 1887 [Pelecaniformes]
  • Anhuisaurus, Hou 1974 [Squamata]
  • Anictis, Kretzoi 1945 [Carnivora]
  • Anictops, Qiu 1977 [Pseudictopidae]
  • Aniliidae, family, L. J. Fitzinger 1826 [Ophidia]
  • Anilioidea, superfamily [Ophidia]
  • Anilioides, Auffenberg 1963 [Aniliidae]
  • Anisolambda, Ameghino 1901 [Proterotheriidae]
  • Anisotemnus, F. Ameghio 1902 [Isotemnidae]
  • Annatherapsidus, Kuhn 1961 [Moschorhinidae]
  • Anniella, Gray 1852 [Anguidae]
  • Annulata, infraorder [Squamata]
  • Anoglochis, Croizet and Jobert 1826 [Cervidae]
  • Anolis, Daudin 1802 [Polychrotidae]
  • Anomalopheidae, family, Auffenberg 1959 [Ophidia]
  • Anomalophis, Auffenberg 1959 [Anomalopheidae]
  • Anomalopteryx, Reichenbach 1853 [Dinornithidae]
  • Anomaluridae, family, Gill 1872 [Rodentia]
  • Anomaluroidea, superfamily, Gervais 1849 [Rodentia]
  • Anomodon, Keyser 1975 [Diictodontidae]
  • Anoplosuchus, Tchudinov 1968 [Estemmenosuchidae]
  • Anoplotherium, Cuvier 1804 [Anoplotheriidae]
  • Anosteira, J. Leidy 1871 [Carettochelyidae]
  • Anourosorex, Milne-Edwards 1872 [Soricidae]
  • Anseriformes, order, Wagler 1831 [Reptilia]
  • Anteosauridae, family, Boonstra 1954 [Dinocephalia]
  • Anteosaurus, Watson 1921 [Anteosauridae]
  • Antepithecus, F. Ameghino 1901 [Interatheriidae]
  • Anthracobunidae, family, N.A. Wells and P.D. Gingerich 1983 [Tethytheria]
  • Anthracobunodon, Heller 1934 [Choeropotamidae]
  • Anthracochoerus, Dal Piaz 1930 [Anthracotheriidae]
  • Anthracokeryx, Pilgrim and Cotter 1916 [Artiodactylamorpha]
  • Anthracosauridae, family, E.D. Cope 1875 [Embolomeri]
  • Anthracosaurus, Huxley 1863 [Anthracosauridae]
  • Anthracosenex, O. Zdansky 1930 [Anthracotheriidae]
  • Anthracothema, G. E. Pilgrim 1928 [Anthracotheriidae]
  • Anthracotheriidae, family, J. Leidy 1869 [Hippopotamoidea]
  • Anthropoidea, suborder, Mivart 1864 [Primates]
  • Antiacodontidae, family [Artiodactyla]
  • Antidorcas, Sundevall 1847 [Bovidae]
  • Antifer, Ameghino 1889 [Cervidae]
  • Antilocapridae, family, Owen 1841 [Pecora]
  • Antilospira, Teilhard de Jardin and Young 1931 [Bovidae]
  • Aonyx, Lesson 1827 [Mustelidae]
  • Apatemyidae, family, W. D. Matthew 1909 [Insectivora]
  • Apateon, H. von Meyer 1844 [Branchiosauridae]
  • Apatotheria, order, W. B. Scott and G. L. Jepsen 1936 [Cimolesta]
  • Apertotemporalis, Stromer 1934 [Reptilia]
  • Aphanapteryx, Milne-Edwards 1874 [Rallidae]
  • Aplodontidae, family, Brandt 1855 [Rodentia]
  • Aplodontoidea, superfamily [Rodentia]
  • Apodi, suborder [Apodiformes]
  • Apodichelys, Price 1954 [Testudines]
  • Apodidae, family, Hartert 1897 [Apodiformes]
  • Apodiformes, order, Peters 1940 [Reptilia]
  • Apodosauriscus, Gauthier 1982 [Anguidae]
  • Aprotodon, Forster-Cooper 1915 [Hyracodontidae]
  • Aptenodytes, J.F. Miller 1778 [Spheniscidae]
  • Apteribis, Olsen and Wetmore 1976 [Plataleidae]
  • Apterornis, Owen 1848 [Apterornithidae]
  • Apterygidae, family, Gray 1840 [Apterygiformes]
  • Apterygiformes, order [Reptilia]
  • Apteryx, Huxley 1867 [Apterygidae]
  • Aptornithidae, family, Bonaparte 1856 [Gruiformes]
  • Apus, Scopoli 1777 [Apodidae]
  • Aquilavus, Lambrecht 1933 [Accipitridae]
  • Araeosaurus, H. G. Seeley 1881 [Squamata]
  • Aramidae, family, Bonaparte 1854 [Gruiformes]
  • Archaeolambda, Flerov 1952 [Pantolambdodontidae]
  • Archaeolambdidae, family, Flerov 1952 [Pantodonta]
  • Archaeolemuridae, family, G. Grandidier 1905 [Primates]
  • Archaeopterygidae, family, T. H. Huxley 1872 [Reptilia]
  • Archaeopterygiformes, order, Furbringer 1888 [Reptilia]
  • Archaeornithes, subclass, Gadow 1893 [Reptilia]
  • Archaeosyodon, Chudinov 1960 [Brithopodidae]
  • Archaeotriton, H. von Meyer 1860 [Salamandridae]
  • Archaeotrogon, Milne-Edward 1891 [Trogonidae]
  • Archaeotrogonidae, family, Mourer-Chauviré 1980 [Coraciiformes]
  • Archegosauridae, family, von Meyer 1857 [Archegosauroidea]
  • Archegosaurus, Goldfuss 1847 [Stereospondylomorpha]
  • Archeria, Case 1918 [Archeriidae]
  • Archeriidae, family, Kuhn 1965 [Embolomeri]
  • Archosauromorpha, infraclass, F. v. Huene 1946 [Archosauromorpha]
  • Archosaurus, Tatarinov 1960 [Proterosuchidae]
  • Arctamphicyon, Pilgrim 1932 [Amphicyonidae]
  • Arctocyonidae, family, Murray 1866 [Eutheria]
  • Arctoidea, superfamily, Flower 1869 [Carnivora]
  • Arctomeles, Stach 1951 [Mustelidae]
  • Arctonyx, F. Cuvier 1825 [Mustelidae]
  • Arctops, Watson 1914 [Gorgonopsidae]
  • Arctostylopidae, family, Schlosser 1923 [Gliriformes]
  • Arctotitan, Wang 1978 [Brontotheriidae]
  • Ardeagrandis, Kurockin and Ganea 1972 [Ardeidae]
  • Ardeidae, family, Vigors 1825 [Ardeiformes]
  • Ardeosauridae, family, Camp 1923 [Squamata]
  • Ardeosaurus, H. von Meyer 1860 [Squamata]
  • Ardynictis, Matthew and Granger 1925 [Didymoconidae]
  • Argentavis, Campbell and Tonni 1980 [Cathartidae]
  • Argillotherium [Oxyaenidae]
  • Argyrohippus, F. Ameghino 1902 [Notohippidae]
  • Argyrohyus, Kraglievich 1959 [Tayassuidae]
  • Argyrolambda, F. Ameghino 1904 [Didolodontidae]
  • Ariekanerpeton, Ivakhnenko 1981 [Discosauriscidae]
  • Aristelliger, Cope 1861 [Gekkonidae]
  • Arkanserpeton, Lane 1932 [Dissorophidae]
  • Arpadosaurus, Meszoely 1970 [Anguidae]
  • Arretosauridae, family, C. W. Gilmore 1943 [Squamata]
  • Arretosaurus, C. W. Gilmore 1943 [Arretosauridae]
  • Arsinoitheriidae, family, Andrews 1904 [Embrithopoda]
  • Arsinotherium [Arsinoitheriidae]
  • Arvernoceros, Heintz 1968 [Cervidae]
  • Asaphestera, Steen 1934 [Lepospondyli]
  • Ascaphidae, family, Fejérváry 1923 [Leiopelmatidae]
  • Asiostylops, Zheng 1979 [Arctostylopidae]
  • Askeptosauridae, family [Pelycosauria]
  • Asmithwoodwardia, Ameghino 1901 [Hyopsodontidae]
  • Asmodus [Homalodotheriidae]
  • Asphaerion, H. von Meyer 1847 [Ranidae]
  • Aspideretes, Hay 1904 [Trionychidae]
  • Aspidosaurus, Broili 1904 [Aspidosauridae]
  • Astegotherium, F. Ameghino 1902 [Dasypodidae]
  • Asterostemma, F. Ameghino 1889 [Glyptodontidae]
  • Astraponotus, Ameghino 1901 [Astrapotheriidae]
  • Astrapothericulus, Ameghino 1901 [Astrapotheriidae]
  • Astrapotheriidae, family, F. Ameghino 1887 [Astrapotheria]
  • Astrapotherium, Burmeister 1879 [Astrapotheriidae]
  • Astreptorhachis, Vaughn 1971 [Dissorophidae]
  • Astrodon johnstoni, J. Leidy 1865 [Anchisauria]
  • Atalonodon, Dal-Piaz 1929 [Perissodactyla]
  • Atelidae, family, Gray 1825 [Primates]
  • Atelornithidae, family [Coraciiformes]
  • Atilax, F. Cuvier 1826 [Herpestidae]
  • Atoposaurus, H. von Meyer 1850 [Neosuchia]
  • Aublysodon, J. Leidy 1868 [Coelurosauria]
  • Aulacephalodontidae, family, Toerien 1953 [Pristerodontia]
  • Aumelasia, Sudre 1980 [Dichobunidae]
  • Aureliachoerus, L. Ginsburg 1974 [Suidae]
  • Avenantia, Boonstra 1952 [Tapinocephalidae]
  • Avimimus, S. M. Kurzanov 1981 [Avimimidae]
  • Badistornis, Wetmore 1940 [Aramidae]
  • Badrostes [Falconidae]
  • Baena, J. Leidy 1870 [Baenidae]
  • Baenidae, family, E. D. Cope 1882 [Testudines]
  • Baenoidea, superfamily [Testudines]
  • Baharijodon, Kuhn 1936 [Trematochampsidae]
  • Bainguidae, family, M. Borsuk-Bialynicka 1984 [Squamata]
  • Bainguis, M. Borsuk-Bialynicka 1984 [Anguidae]
  • Balaenicipitidae, family, Bonaparte 1853 [Balaenicipitiformes]
  • Baldwinonus, Romer and Price 1940 [Eothyrididae]
  • Baluchitherium, Forster Cooper 1913 [Indricotheriidae]
  • Baphetes, Owen 1854 [Labyrinthodontia]
  • Baptornithidae, family, American Ornithologists' Union 1910 [Hesperornithiformes]
  • Baranogale, T. Kormos 1934 [Mustelidae]
  • Bargmannia, Herre 1955 [Dicamptodontidae]
  • Barylambdidae, family, Patterson 1939 [Pantolambdoidea]
  • Barytheriidae, family [Proboscidea]
  • Barytherioidea, suborder, Andrews 1906 [Proboscidea]
  • Barytherium, C.W. Andrews 1901 [Proboscidea]
  • Bashkirosaurus, Gubin 1981 [Archegosauridae]
  • Basicranodon, Vaughn 1958 [Varanopidae]
  • Basileosaurus, Wiedersheim 1879 [Sclerosauridae]
  • Batagur, Gray 1855 [Emydidae]
  • Bathornis, Wetmore 1927 [Bathornithidae]
  • Bathornithidae, family, Wetmore 1933 [Gruiformes]
  • Bathyergidae, family, Waterhouse 1841 [Rodentia]
  • Bathygnathus, J. Leidy 1853 [Pelycosauria]
  • Batrachiderpeton, Hancock and Atthey 1871 [Nectridea]
  • Batrachosauroides, Taylor and Hesse 1943 [Batrachosauroididae]
  • Batrachosaurus, Fitzinger 1840 [Capitosauroidea]
  • Batrachoseps, Bonaparte 1839 [Plethodontidae]
  • Batropetidae, family, R. L. Carroll 1988 [Brachystelechidae]
  • Bauria, Broom 1909 [Bauriidae]
  • Bauriidae, family, Watson 1911 [Theriodontia]
  • Baurusuchidae, family, Price 1945 [Sebecosuchia]
  • Baurusuchus, Price 1945 [Baurusuchidae]
  • Bavarisauridae, family, Kuhn 1961 [Squamata]
  • Bavarisaurus, Hoffstetter 1953 [Squamata]
  • Beatragus, Heller 1912 [Bovidae]
  • Belodon, H. v. Meyer 1844 [Phytosauria]
  • Benaratherium, Gabunia 1955 [Hyracodontidae]
  • Benicerus, Heintz 1973 [Bovidae]
  • Benthosuchidae, family, Efremov 1940 [Capitosauroidea]
  • Benthosuchus, Efremov 1936 [Capitosauria]
  • Beremendia, Kormos 1930 [Soricidae]
  • Bergisuchus, Kuhn 1968 [Sebecosuchia]
  • Biarmosuchidae, family, Olson 1962 [Eotitanosuchia]
  • Biarmosuchus, Chudinov 1960 [Biarmosuchidae]
  • Bibos, Hodgson 1837 [Bovidae]
  • Birgerbohlinia, Crusafont Pairó and Villalta 1951 [Giraffidae]
  • Bitis, Gray 1842 [Viperidae]
  • Blarinella, Thomas 1911 [Soricidae]
  • Blarinoides, A. Sulimski 1959 [Soricidae]
  • Bobbschaefferia, Paula Couto 1970 [Polydolopimorphia]
  • Bogdia, Dashzeveg and Russell 1985 [Pantolestidae]
  • Bohlinia, Matthew 1929 [Giraffidae]
  • Boii, Carroll 1966 [Tuditanidae]
  • Boremys, L. M. Lambe 1906 [Baenidae]
  • Boreopelta, Shishkin 1985 [Rhytidosteidae]
  • Boreortalis, Brodkorb 1954 [Cracidae]
  • Borissiakia, P.M. Butler 1965 [Chalicotheriidae]
  • Boselaphus, de Blainville 1816 [Bovidae]
  • Botauroides, Shufeldt 1915 [Coraciiformes]
  • Botaurus, Stephens 1819 [Ardeidae]
  • Bothriogenys, Schmidt 1913 [Anthracotheriidae]
  • Bothriospondylus, R. C. Owen 1875 [Eusauropoda]
  • Brachycormus, H. von Meyer 1860 [Salamandridae]
  • Brachycyon, Filhol 1872 [Amphicyonidae]
  • Brachydiastematherium, Böckh and Maty 1876 [Brontotheriidae]
  • Brachydiceratherium, R. Lavocat 1952 [Rhinocerotidae]
  • Brachylophosaurus, C. M. Sternberg 1953 [Hadrosauridae]
  • Brachyprosopus, Olson 1937 [Dicynodontia]
  • Brachyramphus, Brandt 1837 [Alcidae]
  • Brachyrhinodon, Huene 1910 [Sphenodontidae]
  • Brachystephanus, Simpson et al. 1962 [Oldfieldthomasiidae]
  • Brachytherium, Ameghino 1883 [Anoplotheriidae]
  • Brachyuraniscus, Broili and Schroder 1935 [Dicynodontia]
  • Bradycneme, C. J. O. Harrison and C. A. Walker 1975 [Reptilia]
  • Bramatherium, Falconer 1845 [Giraffidae]
  • Branchierpeton, Boy 1972 [Micromelerpetontidae]
  • Branchiosauridae, family, Fritsch 1883 [Dissorophoidea]
  • Branchiosaurus, Fric 1878 [Branchiosauridae]
  • Brandmayria, Cabrera 1935 [Notoungulata]
  • Breagyps, Miller 1938 [Cathartidae]
  • Brevidorsum, Carroll 1964 [Dissorophidae]
  • Breviodon, Radinsky 1965 [Lophialetidae]
  • Brithopodidae, family, Efremov 1954 [Eodeinocephalia]
  • Brithopus, Kutorga 1838 [Brithopodidae]
  • Broilia [Emydidae]
  • Broiliana, R. Dehm 1950 [Procyonidae]
  • Broiliellus, Williston 1914 [Dissorophidae]
  • Broilius, Toerien 1953 [Dicynodontia]
  • Brontotheriidae, family, Marsh 1873 [Perissodactyla]
  • Broomulus, Romer 1947 [Stereospondyli]
  • Bruktererpeton, Boy and Bandel 1973 [Gephyrostegidae]
  • Bryanpattersonia, G. G. Simpson 1967 [Archaeohyracidae]
  • Bubalus, Hamilton-Smith 1827 [Bovidae]
  • Bucapra, Rütimeyer 1877 [Bovidae]
  • Bucconidae, family, Boie 1826 [Piciformes]
  • Bucerotidae, family, Rafinesque 1815 [Coraciiformes]
  • Bucerotiformes, order [Reptilia]
  • Bucorvus, Lesson 1830 [Bucerotidae]
  • Budorcas, Hodgson 1850 [Bovidae]
  • Bufonidae, family, Gray 1825 [Salientia]
  • Bugtitherium, G. E. Pilgrim 1908 [Anthracotheriidae]
  • Bukobaja, Ochev 1966 [Trematosauridae]
  • Bunohyrax, Schlosser 1910 [Pliohyracidae]
  • Bunolistriodon, Arambourg 1933 [Suidae]
  • Burhinidae, family, Mathews 1912 [Charadriiformes]
  • Burnetia, Broom 1923 [Burnetiidae]
  • Burnetiidae, family (Broom 1923) [Burnetiidae]
  • Buteo, de Lacepède 1799 [Accipitridae]
  • Butorides, Blyth 1852 [Ardeidae]
  • Butselia, Quinet and Misonne 1965 [Plesiosoricidae]
  • Buxobune, Sudre 1978 [Dichobunidae]
  • Buxolestes, Jaeger 1970 [Pantolestidae]
  • Buzulukia, Vjuschkov 1957 [Kotlassidae]
  • Bystrowiana, Vjuschkov 1957 [Bystrowianidae]
  • Cabassous, McMurtie 1831 [Dasypodidae]
  • Cacops, S. W. Williston 1910 [Dissorophidae]
  • Cadurcoboa, Rage 1978 [Boidae]
  • Cadurcodon, Kretzoi 1942 [Amynodontidae]
  • Cadurcogekko, R. Hoffstetter 1946 [Gekkonidae]
  • Cadurcotherium, Gervais 1873 [Amynodontidae]
  • Caeciliidae, family, Gray 1825 [Gymnophiona]
  • Caenolophus, Matthew and Granger 1925 [Perissodactyla]
  • Caenophilus, F. Ameghino 1904 [Interatheriidae]
  • Caerorhachidae, family [Temnospondyli]
  • Caerorhachis, Holmes and Carroll 1977 [Caerorhachidae]
  • Calamagras, E. D. Cope 1873 [Boidae]
  • Calligenethlon, Steen 1934 [Eogyrinidae]
  • Callopistes, Gravenhorst 1838 [Teiidae]
  • Callowayosaurus [Elasmosauridae]
  • Calodontotherium, Roth 1903 [Isotemnidae]
  • Calonectris, Mathews and Iredale 1915 [Procellariidae]
  • Caluromys, Allen 1900 [Didelphidae]
  • Cambayella, Pilgrim 1939 [Bovidae]
  • Cameloidea, superfamily [Tylopoda]
  • Campephilus, Gray 1840 [Picidae]
  • Campylodoniscus, O. Kuhn 1961 [Anchisauria]
  • Campylognathoides, E. Strand 1928 [Novialoidea]
  • Campylognathoididae, family [Pterosauria]
  • Canidae, family, Fischer 1817 [Carnivora]
  • Canthumeryx, W. R. Hamilton 1973 [Canthumerycidae]
  • Capellirallus, Falla 1954 [Rallidae]
  • Capitonidae, family, Bonaparte 1840 [Piciformes]
  • Capitonides, Ballmann 1969 [Capitonidae]
  • Caprimulgidae, family, N. A. Vigors 1825 [Caprimulgiformes]
  • Caprimulgiformes, order, R. Ridgway 1881 [Reptilia]
  • Capromyidae, family, Smith 1842 [Rodentia]
  • Captorhinida, order [Anapsida]
  • Captorhinomorpha, suborder, D. M. S. Watson 1917 [Cotylosauria]
  • Carbonoherpeton, Klembara 1985 [Eogyrinidae]
  • Carettochelyidae, family, Gill 1889 [Testudines]
  • Carettochelys, Ramsay 1886 [Carettochelyidae]
  • Cariamae, suborder [Gruiformes]
  • Cariamidae, family, Bonaparte 1853 [Gruiformes]
  • Carmargomendesia, Paulo Couto 1978 [Oldfieldthomasiidae]
  • Caroloameghiana, Ameghino 1901 [Didelphidae]
  • Carolozittelia, F. Ameghino 1901 [Pyrotheriidae]
  • Carpolestidae, family, G.G. Simpson 1935 [Primates]
  • Carposorex, J.-Y. Crochet 1975 [Soricidae]
  • Carrolla, Langston and Olsen 1986 [Brachystelechidae]
  • Carteremys, Williams 1953 [Pelomedusidae]
  • Cartictops, Ding and Tong 1979 [Pseudictopidae]
  • Castorimorpha, infraorder [Rodentia]
  • Casuariidae, family, Kaup 1847 [Casuariiformes]
  • Casuariiformes, order [Reptilia]
  • Casuarius, Brisson 1760 [Casuariidae]
  • Catarrhini, infraorder, E. Geoffroy Saint-Hilaire 1812 [Primates]
  • Cathartornis, L.H. Miller 1910 [Cathartidae]
  • Caudiverbera, Laurenti 1768 [Leptodactylidae]
  • Caviidae, family, Waterhouse 1839 [Rodentia]
  • Cavioidea, superfamily, Fischer de Waldheim 1817 [Rodentia]
  • Cebidae, family, Bonaparte 1831 [Primates]
  • Cebochoeridae, family, R. Lydekker [Choeropotamoidea]
  • Cebochoerus, P. Gervais 1852 [Dichobunoidea]
  • Celestus, Gray 1838 [Anguidae]
  • Cephalophus, H. Smith 1827 [Bovidae]
  • Cepphus, Moehring 1758 [Alcidae]
  • Cerataelurus, Broom 1931 [Dicynodontia]
  • Ceratomorpha, suborder, Wood 1937 [Perissodactyla]
  • Ceratophrys, Wied 1824 [Salientia]
  • Ceratotherium, Gray 1868 [Rhinocerotidae]
  • Cerorhinca, Bonaparte 1828 [Alcidae]
  • Cerritosaurus, Price 1946 [Proterochampsidae]
  • Cervavitulus, Kretzoi 1951 [Cervidae]
  • Cervavitus, Chomenko 1913 [Cervidae]
  • Cervoceros, Khomenko 1913 [Cervidae]
  • Cervoidea, superfamily [Pecora]
  • Cervulus, de Blainville 1816 [Cervidae]
  • Cetiosaurus, R. C. Owen 1841 [Cetiosauridae]
  • Chaetophractus, Fitzinger 1871 [Dasypodidae]
  • Chailicyon, Chow 1975 [Canidae]
  • Chalcides, C. Linnaeus 1758 [Scincidae]
  • Chalicotheriidae, family, Gill 1872 [Perissodactyla]
  • Chaliminia, Bonaparte 1980 [Tritheledontidae]
  • Chamaeleo, Laurenti 1768 [Chamaeleonidae]
  • Chamaeleonidae, family, Gray 1825 [Squamata]
  • Champsosauridae, family, E. D. Cope 1876 [Choristodera]
  • Chaosaurus [Omphalosauridae]
  • Chapalmalania, Ameghino 1908 [Procyonidae]
  • Chapattimyidae, family, S. T. Hussain et al. 1978 [Rodentia]
  • Charadriidae, family, Vigors 1825 [Charadriiformes]
  • Chasicotatus, Scillato-Yané 1977 [Dasypodidae]
  • Chasicotherium, Cabrera and Kraglievich 1931 [Homalodotheriidae]
  • Chasmotherium, Rutimeyer [Hyrachyidae]
  • Cheilophis, C. W. Gilmore 1938 [Boidae]
  • Cheirogaleidae, family, Gray 1873 [Primates]
  • Chelidae, family, Lindholm 1929 [Testudines]
  • Cheliderpeton, Fritsch 1877 [Actinodontidae]
  • Chelodina, Fitzinger 1826 [Testudines]
  • Cheloniidae, family, Bonaparte 1832 [Testudines]
  • Chelotriton, Pomel 1853 [Salamandridae]
  • Chelus, Duméril 1806 [Chelidae]
  • Chelydontops, Cluver 1975 [Endothiodontia]
  • Chelydra, Troost 1835 [Testudines]
  • Chelydridae, family, Swainson 1839 [Testudines]
  • Chelydrops, Peters 1868 [Chelydridae]
  • Chelydropsis, Peters 1868 [Chelydridae]
  • Chemositia, Pickford 1979 [Chalicotheriidae]
  • Cherminotus, M. Borsuk-Bialynicka 1984 [Varanidae]
  • Cherminsaurus, A. Sulimski 1975 [Squamata]
  • Chianshania, Xu 1976 [Anagalidae]
  • Chiayusuchus, Bohlin 1953 [Stomatosuchidae]
  • Chigutisauridae, family, Rusconi 1951 [Trematosauria]
  • Chilotherium, Ringström 1924 [Rhinocerotidae]
  • Chinchillidae, family, E. T. Bennett 1833 [Rodentia]
  • Chinchilloidea, superfamily, Bennett 1833 [Rodentia]
  • Chinemys, Smith 1931 [Emydidae]
  • Chiniquodontoidea, superfamily [Eucynodontia]
  • Chioglossa, Bocage 1868 [Salamandridae]
  • Chionididae, family, Lesson 1828 [Charadriiformes]
  • Chiroptera, order, Blumenbach 1779 [Scrotifera]
  • Chisternon, Leidy 1872 [Baenidae]
  • Chitra, Gray 1844 [Trionychidae]
  • Chitracephalus, Dollo 1884 [Testudines]
  • Chlamyphorus, Harlan 1825 [Dasypodidae]
  • Chleuastochoerus, Pearson 1928 [Suidae]
  • Chlorotalpa, Roberts 1924 [Chrysochloridae]
  • Choerolophodon, Schlesinger 1917 [Gomphotheriidae]
  • Choeromeryx, Pomel 1848 [Anthracotheriidae]
  • Choeropotamidae, family, R. Owen 1845 [Choeropotamoidea]
  • Chometokadmon, Costa 1864 [Squamata]
  • Chorobates, Reig 1958 [Dasypodidae]
  • Chroniosaurus, Tverdokhlebova 1972 [Chroniosuchidae]
  • Chroniosuchidae, family, Vjushkov 1957 [Chroniosuchia]
  • Chroniosuchus, Vjuschkov 1957 [Chroniosuchidae]
  • Chrysemys, J. E. Gray 1844 [Testudines]
  • Chrysemys montolivensis, Roman 1897 [Testudines]
  • Chrysochloridae, family, Gray 1825 [Tenrecoidea]
  • Chrysochloris, Lacépède 1799 [Chrysochloridae]
  • Chthomaloporus, Chudinov 1964 [Brithopodidae]
  • Chthonosaurus, Vjushkov 1955 [Moschorhinidae]
  • Chunga, Hartlaub 1860 [Cariamidae]
  • Ciconiidae, family, Sundevall 1836 [Ciconiiformes]
  • Ciconiiformes, order, Bonaparte 1854 [Reptilia]
  • Ciconiopsis, Ameghino 1899 [Ciconiiformes]
  • Circamustela, G. Petter 1967 [Mustelidae]
  • Cistecephaloides, Cluver 1974 [Cistecephalidae]
  • Civettictis, Pocock 1915 [Viverridae]
  • Clamorosaurus, Gubin 1983 [Eryopidae]
  • Clamydosaurus, Gray 1825 [Agamidae]
  • Clapasorex, J.-Y. Crochet 1975 [Soricidae]
  • Claraziidae, family, Peyer 1936 [Diapsida]
  • Clarencea, Brink 1959 [Thecodontia]
  • Clelandina, Broom 1948 [Gorgonopsidae]
  • Clemmydopsis, Boda 1927 [Emydidae]
  • Cnemidophorus, Wagler 1830 [Teiidae]
  • Cochilus, F. Ameghino 1902 [Interatheriidae]
  • Cochleosauridae, family, Broili 1923 [Edopoidea]
  • Cochleosaurus, Fritsch 1885 [Cochleosauridae]
  • Cochlops, F. Ameghino 1889 [Glyptodontidae]
  • Cocomyidae, family, H. de Bruijn et al. 1982 [Rodentia]
  • Cocytinus, E.D. Cope 1871 [Lysorophidae]
  • Coelodonta, Bronn 1831 [Rhinocerotidae]
  • Coelostylodon, G.G. Simpson 1970 [Isotemnidae]
  • Coelurosauravus, Piveteau 1926 [Eosuchia]
  • Coelutaetus, F. Ameghino 1902 [Dasypodidae]
  • Colbertosaurus, Minoprio 1957 [Traversodontidae]
  • Coleonyx, Gray 1845 [Gekkonidae]
  • Coliidae, family, Swainson 1837 [Coliiformes]
  • Coliiformes, order, Murie 1872 [Reptilia]
  • Colius, Brisson 1760 [Coliidae]
  • Colombitheriidae, family, R. Hoffstetter 1970 [Pyrotheria]
  • Colombitherium, R. Hoffstetter 1970 [Pyrotheriidae]
  • Colombophis, R. Hoffstetter and J.-C. Rage 1977 [Aniliidae]
  • Coloraderpeton, Vaughn 1969 [Ophiderpetontidae]
  • Colosteidae, family, E.D. Cope 1875 [Temnospondyli]
  • Colosteoidea, superfamily [Temnospondyli]
  • Colosteus, E.D. Cope 1869 [Colosteidae]
  • Columbiformes, order, Latham 1790 [Reptilia]
  • Colymboides, Milne-Edwards 1867 [Gaviidae]
  • Compressidens, L. Dollo 1924 [Mosasauridae]
  • Compsemys, J. Leidy 1856 [Testudines]
  • Compsodon, Hoepen 1934 [Dicynodontia]
  • Condylarthra, order, E. D. Cope 1881 [Condylarthra]
  • Conjunctio, Carroll 1964 [Dissorophidae]
  • Connochaetes (Lichtenstein 1812) [Bovidae]
  • Conuropsis, Salvadori 1891 [Psittacidae]
  • Convallisodon, Chow and Qi 1978 [Pastoralodontidae]
  • Coracii, suborder, Wetmore and Miller 1926 [Coraciiformes]
  • Coraciidae, family, Vigors 1825 [Coraciiformes]
  • Coraciiformes, order, W. A. Forbes 1884 [Reptilia]
  • Cordylidae, family, J. E. Gray 1837 [Squamata]
  • Cordylodon, H. von Meyer 1859 [Dimylidae]
  • Corvidae, family, Vigors 1825 [Passeriformes]
  • Coryphodontidae, family, O.C. Marsh 1876 [Coryphodontoidea]
  • Corytophanes, Boie 1826 [Iguanidae]
  • Cosesaurus, Ellenberger and Villalta 1974 [Protorosauria]
  • Coturnicops, G. R. Gray 1825 [Rallidae]
  • Cotylorhynchus, J.W. Stovall 1937 [Caseidae]
  • Cracidae, family, Vigors 1825 [Galliformes]
  • Cramauchenia, Ameghino 1902 [Macraucheniidae]
  • Crapartinella, Mendrez 1975 [Crapartinellidae]
  • Crapartinellidae, family, Mendrez 1975 [Theriodontia]
  • Craspedochelys, Rütimeyer 1873 [Plesiochelyidae]
  • Crassigyrinus, Watson 1926 [Labyrinthodontia]
  • Creodonta, order, E. D. Cope 1875 [Creodonta]
  • Crinifer [Musophagidae]
  • Crinodon, Carroll and Gaskill 1978 [Tuditanidae]
  • Criotherium, Forsyth Major 1891 [Bovidae]
  • Crivadiatherium, C. Radulesco et al. 1976 [Palaeoamasidae]
  • Crocidosorex, R. Lavocat 1951 [Soricidae]
  • Crocidura, Wagler 1832 [Soricidae]
  • Crocodilia, order, R. Owen 1842 [Reptilia]
  • Crocodylidae, family, G. Cuvier 1807 [Crocodyloidea]
  • Crocodylus, J. N. Laurenti 1768 [Neosuchia]
  • Crossarchus, F. Cuvier 1825 [Herpestidae]
  • Crossochelys, Simpson 1937 [Meiolaniidae]
  • Crossotelos, Case 1902 [Urocordylidae]
  • Crotaphytus, Holbrook 1843 [Iguanidae]
  • Cryptobranchidae, family, Cope 1889 [Cryptobranchoidea]
  • Cryptobranchoidea, suborder [Urodela]
  • Cryptobranchus, Leuckart 1821 [Cryptobranchidae]
  • Cryptoclididae, family, Williston 1925 [Sauropterygia]
  • Cryptodira, suborder, E. D. Cope 1868 [Testudines]
  • Cryptodraco, R. Lydekker 1889 [Thyreophora]
  • Cryptopithecus, Schlosser 1890 [Pantolestidae]
  • Crypturellus, Brabourne and Chubb 1914 [Tinamidae]
  • Ctenerpeton, Cope 1897 [Urocordylidae]
  • Cteniosaurus, Broom 1935 [Cryptodontidae]
  • Ctenochasmatidae, family, Nopcsa 1928 [Reptilia]
  • Ctenodactylidae, family, Gervais 1853 [Ctenodactylidae]
  • Ctenodactyloidea, superfamily [Rodentia]
  • Ctenomyidae, family, Lesson 1842 [Rodentia]
  • Ctenosaura, Wiegmann 1828 [Iguanidae]
  • Ctenosauriscidae, family, Kuhn 1964 [Poposauroidea]
  • Cuculidae, family, Leach 1820 [Cuculiformes]
  • Cuculiformes, order, Wagler 1830 [Reptilia]
  • Cullinia, Cabrera and Kraglievich 1931 [Macraucheniidae]
  • Cunampaia, Rusconi 1946 [Cunampaiidae]
  • Cunampaiidae, family [Gruiformes]
  • Cuora, Gray 1855 [Emydidae]
  • Cuyosuchus [Erythrosuchidae]
  • Cyamodontidae, family, Nopcsa 1923 [Placodontia]
  • Cyanosaurus [Gorgonopsidae]
  • Cyclanorbis, Gray 1854 [Trionychidae]
  • Cycloderma, Peters 1854 [Trionychidae]
  • Cyclotosaurus, E. Fraas 1889 [Capitosauroidea]
  • Cyclura, Harlan 1824 [Iguanidae]
  • Cygnopterus, Lambrecht 1931 [Anatidae]
  • Cylindrodontidae, family, Miller and Gidley 1918 [Rodentia]
  • Cymatosauridae, family, E. von Huene [Eosauropterygia]
  • Cymbalophus, Hooker 1984 [Perissodactyla]
  • Cynictis, Ogilby 1833 [Herpestidae]
  • Cynognathidae, family [Eucynodontia]
  • Cynognathoidea, superfamily [Eucynodontia]
  • Cynosaurus, Schmidt 1927 [Galesauridae]
  • Cypressaurus, Holman 1972 [Iguanidae]
  • Cypselavus, Gaillard 1908 [Cypselidae]
  • Cypseloides, Streubel 1848 [Apodidae]
  • Cyriacotheriidae, family, Rose and Krause 1982 [Pantolambdoidea]
  • Dacquemys, Williams 1954 [Testudines]
  • Daedicuroides, Castellanos 1941 [Glyptodontidae]
  • Dakotaophis, J.A. Holman 1976 [Colubridae]
  • Damalavus, Arambourg 1958 [Bovidae]
  • Damaliscus, Sclater and Thomas 1894 [Bovidae]
  • Damalops, Pilgrim 1939 [Bovidae]
  • Darchansaurus, A. Sulimski 1975 [Squamata]
  • Dasornis, Owen 1870 [Pelagornithidae]
  • Dasyceps, Huxley 1859 [Zatracheidae]
  • Dasypodoidea, superfamily, Gray 1821 [Xenarthra]
  • Dasyproctidae, family, Gray 1825 [Rodentia]
  • Daunophis, Swinton 1926 [Boidae]
  • Dawsonophis, Holman 1979 [Boidae]
  • Decennatherium, M. Crusafont Pairo 1952 [Giraffidae]
  • Decticadapis, Lemoine 1891 [Ischyromyidae]
  • Deinosuchus, Holland 1909 [Reptilia]
  • Deinotheriidae, family, Bonaparte 1845 [Deinotheriidae]
  • Deinotherioidea, suborder [Proboscidea]
  • Deinotherium, Kaup 1825 [Deinotheriidae]
  • Dendrerpetontidae, family, Fritsch 1885 [Temnospondyli]
  • Dendrochen, Miller 1944 [Anatidae]
  • Deperetella, Matthew and Granger 1925 [Deperetellidae]
  • Deperetellidae, family, Radinsky 1965 [Perissodactyla]
  • Deperetia, Schaub 1923 [Bovidae]
  • Dermatemydidae, family, Baur 1888 [Testudines]
  • Dermatemys, Gray 1847 [Dermatemydidae]
  • Dermochelyidae, family, Lydekker 1889 [Dermochelyidae]
  • Desmana, Guldenstaedt 1777 [Talpidae]
  • Desmanella, B. Engesser 1972 [Talpidae]
  • Desmatodon, Case 1908 [Diadectidae]
  • Desmatotitan, Granger and Gregory 1943 [Brontotheriidae]
  • Desmemys, Wegner 1911 [Pleurosternidae]
  • Desmognathus, Baird 1850 [Plethodontidae]
  • Deuterosaurus, Eichwald 1848 [Deuterosauridae]
  • Deuterotherium, Ameghino 1895 [Proterotheriidae]
  • Devincenzia, L. Kraglievich 1932 [Phorusrhacidae]
  • Diacronus, Xu 1976 [Anagalidae]
  • Diadectes, Cope 1878 [Diadectidae]
  • Diademodon, Seeley 1895 [Gomphodontia]
  • Diademodontidae, family, Haughton 1925 [Gomphodontia]
  • Diadiaphorus, Ameghino 1887 [Proterotheriidae]
  • Diadophis, Baird and Girard 1853 [Colubridae]
  • Diamantomyidae, family, Schaub 1958 [Rodentia]
  • Dianotitan, Chow et al. 1974 [Brontotheriidae]
  • Diaphorapteryx, Forbes 1892 [Rallidae]
  • Diarthrognathus, Crompton 1958 [Tritheledontidae]
  • Diatopornis [Cathartidae]
  • Diatrymidae, family, Shufeldt 1913 [Diatrymiformes]
  • Dibolosodon, Ameghino 1898 [Squamata]
  • Dicamptodon, Strauch 1870 [Dicamptodontidae]
  • Dicamptodontidae, family, Tihen 1958 [Ambystomatoidea]
  • Diceratosaurus, Jaekel 1903 [Nectridea]
  • Dicerorhinus, Gloger 1841 [Rhinocerotidae]
  • Diceros, Gray 1821 [Rhinocerotidae]
  • Dichobune, Cuvier 1822 [Dichobunidae]
  • Dichobunidae, family, T. Gill 1872 [Dichobunoidea]
  • Dicoryphochoerus, Pilgrim 1926 [Suidae]
  • Dicrodon, Duméril and Bibron 1839 [Teiidae]
  • Dicynodon, Owen 1845 [Dicynodontidae]
  • Dicynodontia, suborder, Owen 1859 [Chainosauria]
  • Dicynodontidae, family, Owen 1859 [Dicynodontia]
  • Didermocerus, Brookes 1828 [Rhinocerotidae]
  • Didolodontidae, family, Scott 1913 [Panameriungulata]
  • Diellipsodon, Berg 1899 [Megatheriidae]
  • Digalodon, Broom and Robinson 1948 [Aulacephalodontidae]
  • Diheterocnus, Kraglievich 1928 [Megalonychidae]
  • Diictodon, Broom 1913 [Pylaecephalidae]
  • Diictodontia, infraorder [Dicynodontia]
  • Dilambda, Tong 1978 [Pantolambdodontidae]
  • Dimorphodon, Owen 1859 [Reptilia]
  • Dimorphodontidae, family, Seeley 1870 [Reptilia]
  • Dimylidae, family, Schlosser 1887 [Erinaceoidea]
  • Dimylus, H. von Meyer 1846 [Dimylidae]
  • Dinnebitodon, Sues 1986 [Tritylodontidae]
  • Dinodontosaurus, Romer 1943 [Stahleckeriidae]
  • Dinogorgon, Broom 1936 [Gorgonopsidae]
  • Dinomyidae, family, Peters 1873 [Rodentia]
  • Dinornis, Owen 1843 [Dinornithidae]
  • Dinornithidae, family, Bonaparte 1853 [Dinornithiformes]
  • Dinornithiformes, order [Reptilia]
  • Diogenornis, Alvarenga 1983 [Opisthodactylidae]
  • Diomedeidae, family, Gray 1840 [Procellariiformes]
  • Dipavali, L. Van Valen 1978 [Louisinidae]
  • Diplasiotherium, Rovereto 1914 [Proterotheriidae]
  • Diploceraspis [Nectridea]
  • Diplocynodon, A. Pomel 1847 [Reptilia]
  • Diploglossa, infraorder, Cope 1864 [Squamata]
  • Diploglossus, Wiegmann 1828 [Anguidae]
  • Diplolophodon, O. Zdansky 1930 [Deperetellidae]
  • Diplomesodon, Brandt 1952 [Soricidae]
  • Diplopus, Kowalewsky 1873 [Anthracotheriidae]
  • Diplovertebron, Fritsch 1879 [Eogyrinidae]
  • Dipodidae, family, Waterhouse 1842 [Rodentia]
  • Dipodoidea, superfamily, Fischer 1817 [Rodentia]
  • Dipsosaurus, Hallowell 1854 [Iguanidae]
  • Discoglossidae, family, Günther 1859 [Salientia]
  • Discoglossus, Otth 1837 [Discoglossidae]
  • Discosauriscidae, family, Romer 1947 [Seymouriamorpha]
  • Discosauriscus, Kuhn 1933 [Discosauriscidae]
  • Dissacusium, Zhou et al. 1977 [Mesonychidae]
  • Dissorophidae, family, Boulenger 1902 [Olsoniformes]
  • Dissorophus, Cope 1895 [Dissorophidae]
  • Distylophorus, F. Ameghino 1902 [Isotemnidae]
  • Docodonta, order, Kretzoi 1946 [Mammalia]
  • Doedicurus, H. Burmeister 1874 [Glyptodontidae]
  • Doellotatus, Bordas 1932 [Dasypodidae]
  • Dolichopareias, Watson 1928 [Adelogyrinidae]
  • Dolichorhinoides, Granger and Gregory 1943 [Brontotheriidae]
  • Dolichosauridae, family, P. Gervais 1852 [Pythonomorpha]
  • Dolichosoma, Huxley and Wright 1867 [Phlegethontiidae]
  • Doliochoerus, Filhol 1882 [Suoidea]
  • Doliosauriscus, Kuhn 1961 [Brithopodidae]
  • Dollosuchus, Swinton 1937 [Tomistominae]
  • Dongusia, Huene 1940 [Archosauria]
  • Doragnathus, Smithson 1980 [Trimerorhachidae]
  • Doratodon, H. G. Seeley 1881 [Notosuchia]
  • Dorcadoryx, Teilhard de Jardin and Trassaert 1938 [Bovidae]
  • Dorcadoxa, Pilgrim 1939 [Bovidae]
  • Dormaalius, Quinet 1964 [Amphilemuridae]
  • Dorsetisauridae, family, Hoffstetter 1967 [Squamata]
  • Dorygnathus, A. Wagner 1860 [Rhamphorhynchidae]
  • Dracaena, Daudin 1802 [Teiidae]
  • Dracaenosaurus, Pomel 1846 [Lacertidae]
  • Dremotherium, Geoffroy 1833 [Moschidae]
  • Drepanosaurus, Pinna 1980 [Drepanosauridae]
  • Dromadidae, family, Gray 1840 [Dromatidae]
  • Dromaiidae, family, Richmond 1908 [Casuariiformes]
  • Dromatherium, Emmons 1857 [Cynodontia]
  • Dromiceiomimus, D. A. Russell 1972 [Ornithomimidae]
  • Dromoceratherium, Crusafont et al. 1955 [Rhinocerotidae]
  • Dromornithidae, family, Fürbringer 1888 [Dromornithiformes]
  • Dryolestidae, family, O.C. Marsh 1879 [Dryolestoidea]
  • Dryptosauridae, family, O. C. Marsh 1890 [Avetheropoda]
  • Dunnophis, Hecht 1959 [Tropidophiidae]
  • Dusicyon, C. Hamilton Smith 1839 [Canidae]
  • Dvinia, Amaltizky 1922 [Dviniidae]
  • Dviniidae, family, Tatarinov 1968 [Procynosuchia]
  • Dynamopteryx, Gaillard 1939 [Cuculidae]
  • Dyoplax, Fraas 1867 [Pseudosuchia]
  • Dyrosauridae, family, de Steffano 1903 [Neosuchia]
  • Dyspterna, Hopwood 1927 [Pantolestidae]
  • Dzungariotherium, Chiu 1973 [Indricotheriidae]
  • Echimyidae, family, Gray 1825 [Rodentia]
  • Ecinepeltus [Glyptodontidae]
  • Ecolsonia, Vaughn 1969 [Trematopidae]
  • Edopidae, family [Edopoidea]
  • Edvardotrouessartia, F. Ameghino 1901 [Notostylopidae]
  • Egernia, Gray 1848 [Scincidae]
  • Eggysodon, Roman 1910 [Hyracodontidae]
  • Eichstaettisaurus, Kuhn 1958 [Squamata]
  • Eilenosaurus [Sphenodontidae]
  • Elaphe, Wagler 1833 [Colubridae]
  • Elaphrocnemus, Milne-Edwards 1891 [Orthocnemidae]
  • Elaphurus, Milne-Edwards 1866 [Cervidae]
  • Elasmosauridae, family, E. D. Cope 1869 [Sauropterygia]
  • Elasmotherium, Fischer 1808 [Rhinocerotidae]
  • Elassotherium, Cabrera 1939 [Mylodontidae]
  • Elephantosaurus, Vjuschkov 1969 [Kannemeyeriiformes]
  • Eleutherocercus, Koken 1888 [Glyptodontidae]
  • Eleutherodactylus, Duméril and Bibron 1841 [Leptodactylidae]
  • Eleutherornis, S. Schaub 1940 [Eleutherornithidae]
  • Eleutherornithidae, family, Wetmore 1951 [Gruiformes]
  • Elliotsmithia, Broom 1937 [Varanopidae]
  • Elmisauridae, family, H. Osmólska 1981 [Oviraptorosauria]
  • Emballonuridae, family, G. E. Dobson 1875 [Chiroptera]
  • Emballonuroidea, superfamily [Chiroptera]
  • Embolomeri, suborder [Anthracosauria]
  • Embrithopoda, order [Tethytheria]
  • Embrithosaurus, Watson 1914 [Pareiasauridae]
  • Emeus, Riechenbach 1852 [Dinornithidae]
  • Emydidae, family, Bell 1825 [Testudines]
  • Emydoidea, Gray 1870 [Emydidae]
  • Emydopidae, family, Cluver and King 1983 [Emydopoidea]
  • Emydorhinus, Broom 1935 [Dicynodontia]
  • Emydura, Bonaparte 1836 [Chelidae]
  • Emys, Dumeril 1806 [Emydidae]
  • Enaliornithidae, family [Hesperornithiformes]
  • Enantiornithidae, family [Alexornithidae]
  • Enantiornithiformes, order [Reptilia]
  • Endennasauridae, family [Diapsida]
  • Endomychura, Oberholser 1899 [Alcidae]
  • Endothiodontia, infraorder, Owen 1876 [Endothiodontia]
  • Endothiodontidae, family, Owen 1876 [Dicynodontia]
  • Enhydrictis, Forsyth Major 1902 [Mustelidae]
  • Ennatosaurus, Efremov 1956 [Caseidae]
  • Enneoconus, F. Ameghino 1901 [Didolodontidae]
  • Enosuchus, Konzhukova 1955 [Kotlassidae]
  • Entelodontidae, family, Lydekker 1883 [Cetancodontamorpha]
  • Entelodontoidea, superfamily, Lydekker 1883 [Artiodactyla]
  • Entelopidae, family, F. Ameghino 1889 [Anicanodonta]
  • Entelops, F. Ameghino 1887 [Entelopidae]
  • Eoarctops, Haughton 1929 [Gorgonopsidae]
  • Eoauchenia, Ameghino 1887 [Proterotheriidae]
  • Eocardiidae, family, Ameghino 1891 [Rodentia]
  • Eocyclotosaurus, Ortlam 1970 [Capitosauroidea]
  • Eodesmatodon, Zheng and Chi 1978 [Phenacodontidae]
  • Eodicynodontia, infraorder [Dicynodontia]
  • Eodicynodontidae, family, Barry 1974 [Dicynodontia]
  • Eodiploglossus, Gauthier 1982 [Anguidae]
  • Eodiscoglossus, Villalta 1957 [Discoglossidae]
  • Eoentelodon [Cetancodontamorpha]
  • Eofelis, Kretzoi 1938 [Felidae]
  • Eogavialis, Buffetaut 1982 [Gavialoidea]
  • Eogeranoides, Cracraft 1969 [Geranoididae]
  • Eoglyptosaurus, Sullivan 1979 [Anguidae]
  • Eogruidae, family, Wetmore 1934 [Gruiformes]
  • Eogrus, Wetmore 1934 [Eogruidae]
  • Eogyrinidae, family, Watson 1929 [Embolomeri]
  • Eogyrinus, Watson 1926 [Eogyrinidae]
  • Eohegetotherium, F. Ameghino 1901 [Archaeohyracidae]
  • Eoherpeton, Panchen 1975 [Eoherpetontidae]
  • Eoherpetontidae, family [Embolomeri]
  • Eohyrax, F. Ameghino 1901 [Archaeohyracidae]
  • Eolacerta, Nöth 1940 [Squamata]
  • Eolacertilia, infraorder, Robinson 1967 [Squamata]
  • Eoletes, Biryukov 1974 [Lophialetidae]
  • Eomanis, G. Storch 1978 [Pholidota]
  • Eomegatherium, Kraglievich 1926 [Megatheriidae]
  • Eomorphippus, F. Ameghino 1901 [Notohippidae]
  • Eomyidae, family, Winge 1887 [Rodentia]
  • Eopelobates, H. W. Parker 1929 [Pelobatidae]
  • Eopneumatosuchus, Crompton and Smith 1980 [Crocodyliformes]
  • Eoproterotherium, Ameghino 1904 [Proterotheriidae]
  • Eoraetia, Dietrich 1937 [Chiniquodontoidea]
  • Eorhinophrynus, Hecht 1959 [Rhinophrynidae]
  • Eosaniwa, Haubold 1977 [Necrosauridae]
  • Eosimops, Broom 1922 [Dicynodontia]
  • Eostrix, Brodkorb 1971 [Protostrigidae]
  • Eostylocerus, Zdansky 1925 [Cervidae]
  • Eosuchus, Dollo 1907 [Gavialoidea]
  • Eosyncerus, Vekua 1972 [Bovidae]
  • Eotalpa, B. Sigé et al. [Talpidae]
  • Eotitanosuchia, suborder, Boonstra 1963 [Eotitanosuchia]
  • Eotitanosuchidae, family, Tchudinov 1960 [Eotitanosuchia]
  • Eotitanosuchus, Tchudinov 1960 [Eotitanosuchidae]
  • Eotragus, Pilgrim 1939 [Bovidae]
  • Eoxenopoides, Haughton 1931 [Salientia]
  • Epecuenia, Cabrera 1939 [Proterotheriidae]
  • Epiemys, Yeh 1963 [Emydidae]
  • Epimachairodus, Kretzoi 1929 [Felidae]
  • Epimanteoceras, Granger and Gregory 1943 [Brontotheriidae]
  • Epipatriarchus, F. Ameghino 1904 [Interatheriidae]
  • Epipeltephilus, F. Ameghino 1904 [Xenarthra]
  • Episoriculus, Ellerman and Morrison-Scott 1951 [Soricidae]
  • Epoicotheriidae, family, G.G. Simpson 1927 [Palaeanodonta]
  • Erdenetesaurus, A. Sulimski 1975 [Squamata]
  • Eremias, Wiegmann 1834 [Lacertidae]
  • Erethizontidae, family, Bonaparte 1845 [Rodentia]
  • Erethizontoidea, superfamily, Bonaparte 1845 [Rodentia]
  • Ergilornis, Kozlova 1960 [Ergilornithidae]
  • Ergilornithidae, family, Kozlova 1960 [Gruiformes]
  • Ericiolacerta, Watson 1931 [Ericiolacertidae]
  • Ericiolacertidae, family, Watson and Romer 1956 [Theriodontia]
  • Ernestohaeckelia, Ameghino 1901 [Macraucheniidae]
  • Erpetocephalus, Huxley 1867 [Dendrerpetontidae]
  • Erpetosaurus, Cope 1874 [Saurerpetontidae]
  • Erpetosuchus, E. T. Newton 1894 [Erpetosuchidae]
  • Eryopidae, family, Cope 1882 [Eryopiformes]
  • Eryopoidea, superfamily, Säve-Söderbergh 1935 [Euskelia]
  • Eryosuchus, Ochev 1966 [Capitosauroidea]
  • Erythrotherium, Crompton 1964 [Morganucodontidae]
  • Erythrozootes, Butler and Hopwood 1957 [Tenrecidae]
  • Essonodontherium, F. Ameghino 1884 [Megatheriidae]
  • Estemmenosuchidae, family, Tchudinov 1960 [Estemmenosuchia]
  • Estemmenosuchus, Chudinov 1960 [Estemmenosuchidae]
  • Estheriophagus, Novozhilov 1948 [Procolophonidae]
  • Esthonychidae, family, E.D. Cope 1883 [Tillodontia]
  • Ethegotherium, G.G. Simpson et al. 1962 [Hegetotheriidae]
  • Euchambersia, Broom 1931 [Moschorhinidae]
  • Eucholoeops, F. Ameghino 1887 [Xenarthra]
  • Eucladoceros, Falconer 1868 [Cervidae]
  • Euctenoceros, Trouessart 1898 [Cervidae]
  • Eudocimus, Wagler 1832 [Plataleidae]
  • Eudromia, Geoffroy 1832 [Tinamidae]
  • Eudyptes, Vieillot 1816 [Spheniscidae]
  • Eudyptula, Bonaparte 1856 [Spheniscidae]
  • Euelephantoidea, suborder [Proboscidea]
  • Eugyrinus, Watson 1921 [Dendrerpetontidae]
  • Eumantellia, Broom 1935 [Eumantelliidae]
  • Eumeces, Wiegmann 1834 [Scincidae]
  • Eunectes, Wagler 1830 [Boidae]
  • Eupantotheria, order, Kermack and Musset 1958 [Boreosphenida]
  • Euparkeria, Broom 1913 [Archosauriformes]
  • Euparkeriidae, family, F. v. Huene 1920 [Archosauriformes]
  • Euphractus, Wagler 1830 [Dasypodidae]
  • Euposauridae, family, Camp 1923 [Squamata]
  • Euposaurus, Jourdan 1862 [Lepidosauria]
  • Euproctus, Gené 1838 [Salamandridae]
  • Euprox, Stehlin 1928 [Cervidae]
  • Eurheloderma, Hoffstetter 1957 [Squamata]
  • Eurotamandua, G. Storch 1981 [Pholidota]
  • Euryapteryx, Haast 1874 [Dinornithidae]
  • Eurychororhinus, Broili and Schroeder 1935 [Pristerodontidae]
  • Eurygenium, F. Ameghino 1894 [Notohippidae]
  • Eurylaimidae, family [Passeriformes]
  • Euryletes [Perissodactyla]
  • Euryodon, Y.-X. Xu et al. 1979 [Perissodactyla]
  • Euryonotus, Mercerat 1897 [Rallidae]
  • Eurypygidae, family, Selby 1840 [Gruiformes]
  • Eurysternum, H. von Meyer 1839 [Eurysternidae]
  • Eurystomus, Vieillot 1816 [Coraciidae]
  • Eusarkia [Bothremydidae]
  • Eusarkiidae, family, Bergounioux 1952 [Testudines]
  • Eusophus, Fitzinger 1843 [Leptodactylidae]
  • Eutatus, Gervais 1867 [Dasypodidae]
  • Euthecodon, Fortau 1920 [Crocodylidae]
  • Eutreptornis, Cracraft 1971 [Bathornithidae]
  • Eutypomyidae, family, Miller and Gidley 1918 [Rodentia]
  • Eutypotherium, Roth 1901 [Mesotheriidae]
  • Exaeretodon, Cabrera 1943 [Traversodontidae]
  • Exallerix, M.C. McKenna and Holton 1967 [Erinaceomorpha]
  • Exostinus, E. D. Cope 1873 [Xenosauridae]
  • Falconidae, family, Vigors 1824 [Falconiformes]
  • Falconiformes, order, Sharpe 1874 [Reptilia]
  • Fennecus, Desmarest 1804 [Canidae]
  • Florentiamyidae, family, A.E. Wood 1936 [Rodentia]
  • Floridemys, Williams 1950 [Testudinidae]
  • Fratercula, Brisson 1760 [Alcidae]
  • Fregatae, suborder, Sharpe 1891 [Pelecaniformes]
  • Fregatidae, family, Garrod 1874 [Pelecaniformes]
  • Fringillidae, family, Vigors 1825 [Passeriformes]
  • Fulengidae, family, R. L. Carroll and P. M. Galton 1977 [Squamata]
  • Fulicaletornis, Lambrecht 1933 [Rallidae]
  • Fulmarus, Stephens 1826 [Procellariidae]
  • Gaindatherium, Colbert 1934 [Rhinocerotidae]
  • Galbulidae, family, Bonaparte 1831 [Piciformes]
  • Galemys, Kaup 1829 [Talpidae]
  • Galeops, Broom 1912 [Chainosauria]
  • Galeopsidae, family, Broom 1912 [Pelycosauria]
  • Galepus, Broom 1910 [Chainosauria]
  • Galerix, Pomel 1848 [Erinaceidae]
  • Galesauridae, family, Lydekker 1890 [Epicynodontia]
  • Galesphyridae, family, P. J. Currie 1981 [Neodiapsida]
  • Galesuchus, Haughton 1915 [Gorgonopsidae]
  • Galliformes, order, C. J. Temminck 1820 [Reptilia]
  • Gallinula, Brisson 1760 [Rallidae]
  • Gallinuloides, Eastman 1900 [Gallinuloididae]
  • Gallodactylus, Fabre 1976 [Gallodactylidae]
  • Gallogoral, Guérin 1865 [Bovidae]
  • Gangicobus, Pilgrim 1939 [Bovidae]
  • Ganolophus, Zhang 1979 [Phenacolophidae]
  • Garjainia, Ochev 1958 [Erythrosuchidae]
  • Gastornis, Hébert 1855 [Gastornithidae]
  • Gastrophryne, Fitzinger 1843 [Microhylidae]
  • Gaudrya, Fritsch 1885 [Cochleosauridae]
  • Gavia, Forster 1788 [Gaviidae]
  • Gavialidae, family, Gmelin 1789 [Gavialoidea]
  • Gavialis, Oppel 1811 [Gavialoidea]
  • Gavialosuchus, Toula and Kail 1885 [Tomistominae]
  • Gaviidae, family, Allen 1897 [Gaviiformes]
  • Gaviiformes, order, Wetmore and Miller 1926 [Reptilia]
  • Gaviota, Miller and Sibley 1941 [Laridae]
  • Gazella, Blaineville 1816 [Bovidae]
  • Geckolepis, Grandidier 1867 [Gekkonidae]
  • Geiseltaliellus, Kuhn 1944 [Iguanidae]
  • Gekko, Laurenti 1768 [Gekkonidae]
  • Gekkonidae, family, J. E. Gray 1825 [Squamata]
  • Gelasmodon, Forster-Cooper 1913 [Anthracotheriidae]
  • Gelocidae, family, Schlosser 1886 [Pecora]
  • Genetta, Cuvier 1816 [Viverridae]
  • Geniohyus, Andrews 1904 [Pliohyracidae]
  • Geochelone, Fitzinger 1835 [Testudinidae]
  • Geoclemys, Gray 1855 [Testudines]
  • Geoemyda, Gray 1834 [Emydidae]
  • Geomyidae, family, Bonaparte 1845 [Rodentia]
  • Geomyoidea, superfamily, Bonaparte 1845 [Rodentia]
  • Geotrypus, Pomel 1848 [Talpidae]
  • Gephyrostegida, suborder [Anthracosauria]
  • Gephyrostegidae, family, Jaekel 1909 [Gephyrostegida]
  • Gephyrostegus, Jaekel 1902 [Anthracosauria]
  • Gerandogekko, Hoffstetter 1946 [Gekkonidae]
  • Geranodornis, Cracraft 1969 [Geranoididae]
  • Geranopsis, Lydekker 1891 [Gruidae]
  • Geranopterus, Milne-Edwards 1892 [Geranopteridae]
  • Geringophis, J. A. Holman 1976 [Boidae]
  • Gerrhonotus, Wiegmann 1828 [Anguidae]
  • Gerrhosaurus, Wiegmann 1828 [Cordylidae]
  • Gerrothorax, Nilsson 1934 [Plagiosauridae]
  • Gesneropithex, J. Hürzeler 1946 [Amphilemuridae]
  • Geyeriella, Herre 1950 [Dicamptodontidae]
  • Gigantamynodon, V. Gromova 1954 [Amynodontidae]
  • Gigantohyrax, Kitching 1965 [Procaviidae]
  • Gigantophis, C. W. Andrews 1901 [Madtsoiidae]
  • Gigantornis, Andrews 1916 [Pelagornithidae]
  • Giraffokeryx, Pilgrim 1910 [Giraffidae]
  • Glareola, Brisson 1760 [Glareolidae]
  • Glareolidae, family, Brehm 1831 [Charadriiformes]
  • Glevosaurus, Robinson 1973 [Sphenodontidae]
  • Gliroidea, superfamily, Muirhead 1819 [Rodentia]
  • Glossochelys, Seeley 1871 [Cheloniidae]
  • Glossotheridium, Kraglievich 1934 [Mylodontidae]
  • Glyptodontidae, family, Burmeister 1879 [Xenarthra]
  • Glyptodontoidea, superfamily, Gray 1869 [Xenarthra]
  • Gnathotitan, Granger and Gregory 1943 [Brontotheriidae]
  • Gnorhinosuchus [Seymouriidae]
  • Gnotornis, Wetmore 1942 [Ardeidae]
  • Gobiaatar [Ptilodontidae]
  • Gobiatheriidae, family [Dinocerata]
  • Gobicyon, Colbert 1839 [Canidae]
  • Gobiderma, M. Borsuk-Bialynicka 1984 [Squamata]
  • Gobihippus, Dashzeveg 1979 [Equidae]
  • Gobiocerus, Sokolov 1952 [Bovidae]
  • Gobiosuchidae, family, H. Osmólska 1975 [Crocodyliformes]
  • Goinophis, Homan 1976 [Ophidia]
  • Goliathia [Balaenicipitidae]
  • Gomphodontosuchus, Huene 1928 [Traversodontidae]
  • Gomphos, Shevyreva 1975 [Duplicidentata]
  • Gomphotheriidae, family, O. P. Hay 1922 [Proboscidea]
  • Gondwanosaurus, Lydekker 1885 [Stereospondyli]
  • Gongylomorphus, Fitzinger 1843 [Scincidae]
  • Goniopholis, R. Owen 1842 [Goniopholididae]
  • Goniorhynchidae, family, Carroll and Gaskill 1978 [Tuditanomorpha]
  • Gonotelma, Pilgrim 1908 [Anthracotheriidae]
  • Gopherus, C. S. Rafinesque 1832 [Testudines]
  • Gorgonopsidae, family, Lydekker 1890 [Theriodontia]
  • Goupilictis, Ginsburg 1969 [Amphicyonidae]
  • Gracilisuchidae, family [Thecodontia]
  • Graculavidae, family, Fürbringer 1888 [Charadriiformes]
  • Grallavis, Cheneval 1984 [Ciconiiformes]
  • Grayemys, Chkhikvadze 1970 [Emydidae]
  • Greererpeton, Romer 1969 [Temnospondyli]
  • Griphodon, Anthony 1924 [Pyrotheriidae]
  • Grues, suborder, Bonaparte 1854 [Gruiformes]
  • Gruidae, family, Vigors 1825 [Gruiformes]
  • Gruiformes, order, Bonaparte 1854 [Reptilia]
  • Grus, Brisson 1760 [Gruidae]
  • Gryposuchus, Guerich 1912 [Gavialoidea]
  • Gryzaja, Zubareva 1939 [Otididae]
  • Guilestes, Zheng and Chi 1978 [Mesonychidae]
  • Guilielmofloweria, Ameghino 1901 [Proterotheriidae]
  • Guilielmoscottia, F. Ameghino 1901 [Interatheriidae]
  • Guixia, You 1977 [Hyracodontidae]
  • Gymnophiona, order, C. S. Rafinesque 1814 [Amphibia]
  • Gymnurechinus, P.M. Butler 1956 [Erinaceidae]
  • Gypsornis, Milne-Edwards 1868 [Idiornithidae]
  • Gyrinophilus, Cope 1869 [Plethodontidae]
  • Habromeryx, Cabrera 1929 [Cervidae]
  • Hadrictis, Pia 1939 [Mustelidae]
  • Hadrokkosaurus, Welles 1958 [Brachyopoidea]
  • Haematopodidae, family, Bonaparte 1838 [Haematopodidae]
  • Halcyones, suborder [Coraciiformes]
  • Halcyornis, Owen 1846 [Halcyornithidae]
  • Halcyornithidae, family, Harrison and Walker 1972 [Psittaciformes]
  • Halictops, Ding and Tong 1979 [Pseudictopidae]
  • Hallautherium, W. A. Clemens 1980 [Morganucodonta]
  • Hallopoda, suborder, O. C. Marsh 1881 [Paracrocodylia]
  • Halticosaurus, F. v. Huene 1908 [unclassified genus]
  • Hangaiemys, V. B. Sukhanov and P. Narmandakh 1974 [Testudines]
  • Hapalodectidae, family, Ting and Li 1987 [Acreodi]
  • Hapaloides, F. Ameghino 1902 [Megatheriidae]
  • Hapalops, F. Ameghino 1887 [Xenarthra]
  • Haplobunodon, C. Deperet 1908 [Choeropotamidae]
  • Haplobunodontidae, family, G. E. Pilgrim 1941 [Choeropotamidae]
  • Haplocyon, Schlosser 1901 [Amphicyonidae]
  • Haplocyonoides, H. Hürzeler 1940 [Amphicyonidae]
  • Haplocyonopsis, de Bonis 1973 [Amphicyonidae]
  • Haplomastodon, Hoffstetter 1950 [Gomphotheriidae]
  • Haptodus, Gaudry 1886 [Haptodontinae]
  • Hardella, Gray 1870 [Emydidae]
  • Harpaleocyon, J. Hürzeler 1944 [Ursidae]
  • Harpyodidae, family, Wang 1979 [Pantodonta]
  • Harrisonsaurus, J. A. Holman 1981 [Iguanidae]
  • Haughtoniana, Boonstra 1938 [Dicynodontia]
  • Hayemys, Gaffney 1972 [Baenidae]
  • Hecubides, Savage 1965 [Amphicyonidae]
  • Hegetotherium, F. Ameghino 1887 [Hegetotheriidae]
  • Hegetotheroidea, superfamily [Notoungulata]
  • Helagras, E. D. Cope 1883 [Ophidia]
  • Helarctos, Horsfield 1826 [Ursidae]
  • Heleophilus, Broom 1909 [Millerettidae]
  • Heleosuchus, Broom 1913 [Younginidae]
  • Helicoportax, Pilgrim 1937 [Bovidae]
  • Helicotragus, Palmer 1903 [Bovidae]
  • Heliornithidae, family, Gray 1841 [Ralliformes]
  • Helladotherium, Gaudry 1860 [Giraffidae]
  • Helochelys, H. von Meyer 1854 [Solemydidae]
  • Heloderma, Wiegmann 1829 [Squamata]
  • Helodermatidae, family, Gray 1837 [Squamata]
  • Helogale, Gray 1861 [Herpestidae]
  • Helohyidae, family, Marshall 1877 [Artiodactylamorpha]
  • Helveticosauridae, family, Peyer 1955 [Placodontia]
  • Helvetiodon, W. A. Clemens 1980 [Morganucodontidae]
  • Hemibos, Falconer 1865 [Bovidae]
  • Hemichelys, Lydekker 1887 [Carettochelyidae]
  • Hemichoerus, Filhol 1882 [Suidae]
  • Hemidactylus, Cuvier 1817 [Gekkonidae]
  • Hemihegetotherium, Rovereto 1914 [Hegetotheriidae]
  • Hemimeryx, Lydekker 1883 [Anthracotheriidae]
  • Hemiprotosuchus, J. F. Bonaparte 1969 [Crocodyliformes]
  • Hemistrepsiceros, Pilgrim and Hopwood 1928 [Bovidae]
  • Hemitragus, Hodgson 1841 [Bovidae]
  • Hemixotodon, Cabrera and Kraglievich 1931 [Toxodontidae]
  • Henodontidae, family, F. von Huene 1948 [Placodontia]
  • Henophidia, infraorder [Ophidia]
  • Henricofilholia, F. Ameghino 1901 [Leontiniidae]
  • Henricosbornia, F. Ameghino 1901 [Henricosborniidae]
  • Henricosborniidae, family, F. Ameghino 1901 [Notoungulata]
  • Heothema, Tang 1978 [Anthracotheriidae]
  • Herpestes, Illliger 1811 [Herpestidae]
  • Herpestides, de Beaumont 1967 [Carnivora]
  • Hesperidoceras, Crusafont Pairo 1965 [Bovidae]
  • Heterocemas, Young 1937 [Cervoidea]
  • Heterodon, Latreille 1801 [Colubridae]
  • Heteroglyphis, Roth 1899 [Proterotheriidae]
  • Heteromyidae, family, Gray 1868 [Rodentia]
  • Heteroprox, Schaub 1928 [Cervoidea]
  • Heterorhea, Rovereto 1914 [Rheidae]
  • Heuneus, Toerien 1953 [Dicynodontia]
  • Hexaprotodon, Falconer and Cautley 1836 [Hippopotamidae]
  • Hippocamelus, Leuckart 1816 [Cervidae]
  • Hippohyus, Falconer and Cautley 1847 [Suidae]
  • Hippomorpha, suborder [Perissodactyla]
  • Hippopotamoidea, superfamily [Cetancodonta]
  • Hipposauridae, family [Theriodontia]
  • Hipposaurus, Haughton 1929 [Ictidorhinidae]
  • Hipposideridae, family, Lydekker 1891 [Chiroptera]
  • Hippotragus, Sundevall 1845 [Bovidae]
  • Hispanochampsa, Kalin 1936 [Alligatoridae]
  • Hispanotherium, Crusafont and Villalta 1947 [Rhinocerotidae]
  • Hofmeyria, Broom 1935 [Hofmeyriidae]
  • Hofmeyriidae, family [Theriodontia]
  • Holbrookia, Girard 1851 [Iguanidae]
  • Holopsisuchus, Kuhn 1961 [Gavialoidea]
  • Homalodotheriidae, family, Gregory 1910 [Notoungulata]
  • Homalodotherium, Huxley 1870 [Homalodotheriidae]
  • Homalostylops, F. Ameghino 1901 [Notostylopidae]
  • Hominidae, family, Gray 1825 [Primates]
  • Hominoidea, superfamily, Gray 1825 [Primates]
  • Honanodon, Chow 1965 [Mesonychidae]
  • Honanotherium, Bohlin 1927 [Giraffidae]
  • Hondadelphys, Marshall 1976 [Hondadelphidae]
  • Hoplophorus, P. W. Lund 1838 [Glyptodontidae]
  • Hovasaurus, Piveteau 1926 [Tangasauridae]
  • Hsiuannania, Xu 1976 [Anagalidae]
  • Huaiyangale, Xu 1976 [Anagalidae]
  • Huananodon, You 1977 [Perissodactyla]
  • Huananothema, Y. Tang 1978 [Anthracotheriidae]
  • Huangotherium [Rhinocerotidae]
  • Huanhepterus, Z. Dong 1982 [Reptilia]
  • Huberophis, J.A. Holman 1977 [Boidae]
  • Hulgana, M. Dawson 1962 [Ischyromyidae]
  • Hupehsuchidae, family [Ichthyopterygia]
  • Hyaenictis, Gaudry 1861 [Hyaenidae]
  • Hyaenodontidae, family, J. Leidy 1869 [Creodonta]
  • Hydaspicobus, Pilgrim 1939 [Bovidae]
  • Hydaspitherium, Lydekker 1877 [Giraffidae]
  • Hydrictis, Pocock 1921 [Mustelidae]
  • Hydrochoeridae, family, Gill 1872 [Rodentia]
  • Hydromedusa, Wagler 1830 [Chelidae]
  • Hydropotes, Swinhoe 1870 [Cervidae]
  • Hylaeochampsa, Owen 1874 [Hylaeochampsidae]
  • Hylaeochampsidae, family, Williston 1925 [Eusuchia]
  • Hylidae, family, Rafinesque 1815 [Salientia]
  • Hylobatidae, family, Gray 1870 [Primates]
  • Hyloplesion, Fritsch 1883 [Hyloplesiontidae]
  • Hynobiidae, family [Urodela]
  • Hyoboops, Trouessart 1905 [Anthracotheriidae]
  • Hyopsodontidae, family, Trouessart 1879 [Ungulata]
  • Hyosus, Pilgrim 1926 [Suidae]
  • Hyotitan, Granger and Gregory 1943 [Brontotheriidae]
  • Hyperdichobune, H. G. Stehlin 1910 [Dichobunidae]
  • Hyperdidelphys, Ameghino 1904 [Didelphidae]
  • Hyperleptus, F. Ameghino 1891 [Megalonychidae]
  • Hyperodapedon, Huxley 1859 [Rhynchosauria]
  • Hyperoxotodon, Mercerat 1895 [Toxodontidae]
  • Hypertragulidae, family, E.D. Cope 1879 [Ruminantia]
  • Hypsamynodon, Gromova 1954 [Amynodontidae]
  • Hypsilolambda, Wang 1975 [Bemalambdidae]
  • Hypsimylus, Zhai 1977 [Lagomorpha]
  • Hypsodontus, Sokolov 1949 [Bovidae]
  • Hyracodontidae, family, Cope 1879 [Perissodactyla]
  • Hyracoidea, order, Huxley 1869 [Hyracoidea]
  • Hystricidae, family, Fischer de Waldheim 1817 [Rodentia]
  • Hystricognathi, suborder, Tullberg 1899 [Rodentia]
  • Hystricomorpha, infraorder [Rodentia]
  • Iberomeryx, Gabunia 1964 [Moschidae]
  • Iberosuchus, Antunes 1975 [Sebecosuchia]
  • Iberovaranus, Hoffstetter 1969 [Varanidae]
  • Ibidopsis, Lydekker 1891 [Rallidae]
  • Icaronycteroidea, superfamily [Chiroptera]
  • Ichthyophiidae, family [Gymnophiona]
  • Ichthyopterygia, order, R. C. Owen 1840 [Ichthyopterygia]
  • Ichthyosauridae, family, Bonaparte 1841 [Thunnosauria]
  • Ichthyostega, Save-Soderbergh 1932 [Ichthyostegidae]
  • Ichthyostegalia, order, Säve-Söderbergh 1932 [Ichthyostegalia]
  • Ichthyostegidae, family, Save-Soderbergh 1932 [Ichthyostegalia]
  • Ichthyostegopsis, Save-Soderbergh 1932 [Ichthyostegidae]
  • Ictidorhinidae, family, Broom 1932 [Theriodontia]
  • Ictidorhinus, Broom 1913 [Ictidorhinidae]
  • Ictidostoma, Broom 1931 [Hofmeyriidae]
  • Ictidosuchidae, family, Broom 1903 [Theriodontia]
  • Ictidosuchoides, Broom 1931 [Ictidosuchidae]
  • Ictidosuchops, Broom 1938 [Ictidosuchidae]
  • Ictitherium, Wagner 1848 [Hyaenidae]
  • Ictonyx, Kaup 1835 [Mustelidae]
  • Ictopidium, O. Zdansky 1930 [Erinaceidae]
  • Idiornis, Oberholser 1899 [Idiornithidae]
  • Idiornithidae, family, Brodkorb 1965 [Gruiformes]
  • Iguana, Laurenti 1768 [Iguanidae]
  • Iguanavus, Marsh 1892 [Squamata]
  • Iguania, infraorder, G. Cuvier 1817 [Squamata]
  • Iguanidae, family, J. E. Gray 1827 [Squamata]
  • Ikanogavialis, Sill 1970 [Gavialoidea]
  • Ilchunaia, Rusconi 1946 [Sebecidae]
  • Ilerdaesaurus, Hoffstetter 1966 [Squamata]
  • Ilianodon, Chow and Xu 1961 [Hyracodontidae]
  • Imequincisoria, Wang 1976 [Hyracodontidae]
  • Indalecia, Bond and Vucetich 1983 [Adianthidae]
  • Indicatoridae, family, Swainson 1837 [Piciformes]
  • Indolophus, G. E. Pilgrim 1925 [Perissodactyla]
  • Indoredunca, Pilgrim 1939 [Bovidae]
  • Indratherium, Pilgrim 1910 [Giraffidae]
  • Indricotherium, Borissiak 1916 [Indricotheriidae]
  • Indriidae, family, Burnett 1828 [Primates]
  • Indrioidea, superfamily [Primates]
  • Inflectosaurus, Shishkin 1960 [Platystegidae]
  • Injanatherium, Heintz et al. 1981 [Canthumerycidae]
  • Inostrancevia, Amalitski 1922 [Gorgonopsidae]
  • Intasuchus, Konzhukova 1956 [Intasuchidae]
  • Interatheriidae, family, F. Ameghino 1887 [Notoungulata]
  • Interatherium, F. Ameghino 1887 [Interatheriidae]
  • Interhippus, F. Ameghino 1902 [Notohippidae]
  • Iranotherium, Ringström 1924 [Rhinocerotidae]
  • Iratusaurus, Gubin 1980 [Dissorophidae]
  • Ischignathus, J. F. Bonaparte 1963 [Traversodontidae]
  • Isodontosaurus, C. W. Gilmore 1943 [Squamata]
  • Itaboraitherium, Paula Couto 1970 [Oldfieldthomasiidae]
  • Itasuchus, L. I. Price 1955 [Crocodyliformes]
  • Jacana, Brisson 1760 [Jaccanidae]
  • Jacanidae, family, Stejneger 1885 [Jaccanidae]
  • Jacheleria, Bonaparte 1971 [Kannemeyeriidae]
  • Jepsibaena, Vanzolini 1951 [Rhineuridae]
  • Jiangxia, Zhang et al. 1979 [Mesonychidae]
  • Jonkeria, Hoepen 1916 [Titanosuchidae]
  • Jozaria, N.A. Wells and P.D. Gingerich 1983 [Anthracobunidae]
  • Juxia, Chow and Chiu 1964 [Perissodactyla]
  • Kabulicornis, Heintz and Thomas 1981 [Bovidae]
  • Kachuga, Gray 1869 [Emydidae]
  • Kadaliosaurus, Credner 1889 [Araeoscelidae]
  • Kallokibotiidae, family, Nopcsa 1923 [Testudines]
  • Kallokibotium, Nopcsa 1923 [Kallokibotiidae]
  • Kamacops, Gubin 1980 [Dissorophidae]
  • Kannemeyeria, Seeley 1908 [Dicynodontoidea]
  • Kannemeyeriidae, family, Huene 1948 [Dicynodontia]
  • Kansajsuchus, Efimov 1975 [Goniopholididae]
  • Kansuchelys, Yeh 1963 [Testudinidae]
  • Karatausuchus, Efimov 1976 [Atoposauridae]
  • Karauridae, family, Ivachnenko 1978 [Caudata]
  • Karaurus, Ivachnenko 1978 [Karauridae]
  • Karpinskiosaurus, Sushkin 1925 [Kotlassidae]
  • Kawingasaurus, Cox 1972 [Cistecephalidae]
  • Kelba, Savage 1965 [Ptolemaiidae]
  • Kennalestidae, family [Eutheria]
  • Kenyamyidae, family, R. Lavocat 1973 [Rodentia]
  • Keraterpeton, Etheridge 1866 [Nectridea]
  • Keraterpetontidae, family, O. Jaekel 1903 [Nectridea]
  • Keratocephalus, Huene 1931 [Tapinocephalidae]
  • Kestrosaurus, Haughton 1925 [Mastodonsauridae]
  • Kichechia, Savage 1965 [Viverridae]
  • Kingoria, Cox 1959 [Kingoriidae]
  • Kinixys, Bell 1827 [Testudinidae]
  • Kinosternidae, family, Hay 1892 [Testudines]
  • Kinosternon, von Spix 1824 [Kinosternidae]
  • Koalliella, Herre 1950 [Salamandridae]
  • Kobikeryx, Pilgrim 1939 [Bovidae]
  • Kobus, Smith 1840 [Bovidae]
  • Kolpochoerus, van Hoepen and van Hoepen 1932 [Suidae]
  • Korynochoerus, N. Schmidt-Kittler 1971 [Suidae]
  • Kotlassia, Amalitzky 1921 [Kotlassidae]
  • Kotlassidae, family, Romer 1933 [Seymouriamorpha]
  • Koupia, Boonstra 1948 [Dicynodontia]
  • Kuanchuanius, Chow 1963 [Tillodontia]
  • Kubanochoerus, Gabunia 1955 [Suidae]
  • Kubanotragus, Gabunia 1973 [Bovidae]
  • Kuehneotheriidae, family, Kermack et al. 1968 [Mammalia]
  • Kvabebihyrax, Gabunia and Vekua 1966 [Pliohyracidae]
  • Laccocephalus, Watson 1919 [Stereospondylomorpha]
  • Lacertidae, family, Bonaparte 1831 [Squamata]
  • Lacertilia, order, R. Owen 1842 [Squamata]
  • Lacertulus, Carroll 1981 [Neodiapsida]
  • Laemanctus, Wiegmann 1834 [Iguanidae]
  • Lafonius, Berman 1979 [Trimerorhachidae]
  • Lagomorpha, order, Brandt 1885 [Duplicidentata]
  • Lammidhania, Gingerich 1977 [Anthracobunidae]
  • Lampropeltis, Fitzinger 1843 [Colubridae]
  • Lanthaniscus, Ivakhnenko 1980 [Lanthaniscidae]
  • Lanthanotidae, family, Steindachner 1878 [Squamata]
  • Lantianius, Chow 1964 [Dichobunidae]
  • Laphyctis, J. Viret 1933 [Mustelidae]
  • Lapparentopheidae, family, Hoffstetter 1968 [Ophidia]
  • Laridae, family, Vigors 1825 [Charadriiformes]
  • Lartetotherium, Ginsburg 1974 [Rhinocerotidae]
  • Laterallus, Bonaparte 1854 [Rallidae]
  • Latonia, H. von Meyer 1843 [Salientia]
  • Leecyaena, Young and Liu 1948 [Hyaenidae]
  • Leiocephalikon, Steen 1934 [Gymnarthridae]
  • Leiocephalus, Gray 1827 [Iguanidae]
  • Leiosaurus, Duméril and Bibron 1837 [Iguanidae]
  • Lemuriformes, infraorder, W. K. Gregory 1915 [Primates]
  • Lemuroidea, suborder, Mivart 1864 [Primates]
  • Lemurosaurus, Broom 1949 [Ictidorhinidae]
  • Leontinia, Ameghino 1895 [Leontiniidae]
  • Leontiniidae, family [Notoungulata]
  • Leontocephalus, Broom 1940 [Gorgonopsidae]
  • Lepidophyma, Duméril 1851 [Xantusiidae]
  • Lepidosauromorpha, infraclass, M. J. Benton 1983 [Neodiapsida]
  • Leporidae, family, Fischer de Waldheim 1817 [Lagomorpha]
  • Lepterpeton, Etheridge 1866 [Urocordylidae]
  • Leptictidium, H. Tobien 1962 [Leptictidae]
  • Leptobos, Rütimeyer 1877 [Bovidae]
  • Leptochoeridae, family, Marsh 1894 [Entelodontoidea]
  • Leptodactylidae, family, Berg 1838 [Salientia]
  • Leptodactylus, Fitzinger 1826 [Leptodactylidae]
  • Leptoglossa, infraorder [Squamata]
  • Leptomerycidae, family, Zittel 1893 [Leptomerycidae]
  • Leptophractus, E.D. Cope 1873 [Eogyrinidae]
  • Leptopterygiidae, family, Kuhn 1934 [Heteropinnatoidea]
  • Leptosomidae, family, Bonaparte 1850 [Leptosomidae]
  • Leptotheridium, Stehlin 1910 [Anoplotheriidae]
  • Leptotragus, Bohlin 1936 [Bovidae]
  • Lessnessina, J. J. Hooker 1979 [Hyopsodontidae]
  • Lestodelphys, Tate 1934 [Didelphidae]
  • Lestodon, Gervais 1855 [Mylodontidae]
  • Lestophis, Marsh 1885 [Rhineuridae]
  • Lethiscidae, family, Wellstead 1982 [Aistopoda]
  • Lethiscus, Wellstead 1982 [Lethiscidae]
  • Letoverpeton, Spinar 1952 [Discosauriscidae]
  • Libycosuchidae, family, Stromer 1914 [Mesoeucrocodylia]
  • Libytherium, Pomel 1892 [Giraffidae]
  • Licaphrium, Ameghino 1887 [Proterotheriidae]
  • Licaphrops, Ameghino 1904 [Proterotheriidae]
  • Limnatornis, Milne-Edwards 1870 [Coliidae]
  • Limnerpeton, Fritsch 1881 [Micromelerpetontidae]
  • Limognitherium, Filhol 1880 [Chalicotheriidae]
  • Lindholmemys, Riabinin 1935 [Dermatemydidae]
  • Lissemys, Smith 1931 [Trionychidae]
  • Listriodon, von Meyer 1846 [Suidae]
  • Lithornidae, family [Reptilia]
  • Lithornis, Owen 1840 [Lithornithidae]
  • Litopterna, order, Ameghino 1889 [Litopterna]
  • Lohoodon, Chow et al. 1973 [Mesonychidae]
  • Lomaphorus, F. Ameghino 1889 [Glyptodontidae]
  • Longiscitula, DeMar 1966 [Dissorophidae]
  • Lophialetes, Matthew and Granger 1925 [Lophialetidae]
  • Lophialetidae, family, Matthew and Granger 1925 [Perissodactyla]
  • Lophiaspis, Depéret 1910 [Lophiodontidae]
  • Lophiobunodon, Deperet 1908 [Choeropotamidae]
  • Lophiodontidae, family, T. Gill 1872 [Perissodactyla]
  • Lophiohys [Artiodactylamorpha]
  • Lophiopus, Ellenberger 1980 [Equidae]
  • Lophochoerus, Pilgrim 1926 [Suidae]
  • Lophogonodon, Ameghino 1904 [Mesonychidae]
  • Lopholistriodon, Pickford and Wilkinson 1975 [Suidae]
  • Loricata, infraorder [Xenarthra]
  • Loricosaurus, B. F. von Huene 1929 [Saltasauridae]
  • Lorisoidea, superfamily [Primates]
  • Louisina, Russell 1964 [Louisinidae]
  • Loxodonta, Cuvier 1825 [Elephantidae]
  • Loxomma, Huxley 1862 [Baphetidae]
  • Loxommatidae, family, Gardner 1982 [Baphetidae]
  • Loxommatoidea, superfamily [Labyrinthodontia]
  • Ludiortyx, Brodkorb 1964 [Rallidae]
  • Lunania, Chow 1957 [Perissodactyla]
  • Lupersuchus [Rauisuchidae]
  • Lushiamynodon, Chow and Xu 1965 [Amynodontidae]
  • Lutreolina, Thomas 1910 [Didelphidae]
  • Luzocephalus, Shishkin 1980 [Stereospondyli]
  • Lycaenodon, Broom 1925 [Ictidorhinidae]
  • Lycaenops, Broom 1925 [Gorgonopsidae]
  • Lycaon, Brookes 1827 [Canidae]
  • Lycideops, Broom 1931 [Lycideopidae]
  • Lycideopsidae, family, Broom 1931 [Theriodontia]
  • Lycyaena, Hensel 1863 [Hyaenidae]
  • Lydekkerinidae, family, Watson 1919 [Stereospondylomorpha]
  • Lygodactylus, Gray 1864 [Gekkonidae]
  • Lyncodon, Gervais 1844 [Mustelidae]
  • Lyrocephaliscus, Kuhn 1961 [Lyrocephaliscidae]
  • Lyrocerus, Teilhard de Jardin and Trassaert 1938 [Bovidae]
  • Lysorophia, order [Lepospondyli]
  • Lysorophidae, family, Williston 1908 [Microsauria]
  • Mabokopithecus, G.H.R. von Koenigswald 1969 [Suidae]
  • Mabuya, Fitzinger 1826 [Scincidae]
  • Macedonitherium, Sickenberg 1967 [Giraffidae]
  • Machimosaurus [Teleosauridae]
  • Machlydotherium, Ameghino 1902 [Pampatheriidae]
  • Macrauchenia, Owen 1838 [Macraucheniidae]
  • Macraucheniidae, family, Gill 1872 [Litopterna]
  • Macraucheniopsis, Paula Couto 1945 [Macraucheniidae]
  • Macrobaena, Tatarinov 1959 [Macrobaenidae]
  • Macrocephalochelys, Piboplichko and Taraschchuk 1960 [Chelydridae]
  • Macroclemys (Gray 1855) [Chelydridae]
  • Macroeuphractus, F. Ameghino 1887 [Dasypodidae]
  • Macrogalidia, Schwarz 1910 [Viverridae]
  • Macromerion, Fritsch 1879 [Sphenacodontidae]
  • Macroscelidea, order, Butler 1956 [Afroinsectivora]
  • Macroscelididae, family, C. L. Bonaparte 1838 [Afroinsectivora]
  • Macrurosaurus, H. G. Seeley 1869 [Macronaria]
  • Madoqua, Ogilby 1837 [Bovidae]
  • Majungatholus, H.-D. Sues and P. Taquet 1979 [Abelisauridae]
  • Makapania, Wells and Cooke 1957 [Bovidae]
  • Malpolon, Fitzinger 1826 [Colubridae]
  • Mammutidae, family, Hay 1922 [Proboscidea]
  • Mammutoidea, suborder [Proboscidea]
  • Manatidae, family [Trichechidae]
  • Mandasuchus, Charig 1976 [Rauisuchidae]
  • Mandschurosaurus, Riabinin 1925 [Hadrosauridae]
  • Marcetia, G. Petter 1967 [Mustelidae]
  • Marmosa, Gray 1821 [Didelphidae]
  • Masilabune, H. Tobien 1980 [Choeropotamidae]
  • Masillamys, H. Tobien 1954 [Ischyromyidae]
  • Mastodonsauridae, family, Lydekker 1885 [Capitosauroidea]
  • Matutinia, Li et al. 1979 [Eurymylidae]
  • Mauremys, Gray 1870 [Emydidae]
  • Maxschlosseria, Ameghino 1901 [Oldfieldthomasiidae]
  • Medistylus, Stirton 1952 [Interatheriidae]
  • Megachiroptera, suborder, Dobson 1875 [Chiroptera]
  • Megacnemus, von Huene 1954 [Prolacertidae]
  • Megadermatidae, family, H. Allen 1864 [Chiroptera]
  • Megadyptes, Milne-Edwards 1880 [Spheniscidae]
  • Megaegotheles, Scarlett 1968 [Aegothelidae]
  • Megalania, R. Owen 1859 [Varanidae]
  • Megalapidae, family [Primates]
  • Megalapteryx, Haast 1885 [Dinornithidae]
  • Megalocephalus, Barkas 1873 [Baphetidae]
  • Megaloceros, Brookes 1828 [Cervidae]
  • Megalohyrax, Andrews 1903 [Pliohyracidae]
  • Megalonychidae, family, Gervais 1855 [Xenarthra]
  • Megalonychoidea, superfamily [Xenarthra]
  • Megalonychops, Kraglievich 1927 [Megalonychidae]
  • Megalonychotherium, Scott 1904 [Megalonychidae]
  • Megalotragus, van Hoepen 1932 [Bovidae]
  • Megalotriton, Zittel 1890 [Salamandridae]
  • Megalovis, Schaub 1924 [Bovidae]
  • Megamolgophis, Romer 1952 [Lysorophidae]
  • Megapaloelodus, A. H. Miller 1944 [Paloelodidae]
  • Megathericulus, F. Ameghino 1904 [Megatheriidae]
  • Meiolania, Owen 1886 [Meiolaniidae]
  • Meiolaniidae, family, Lydekker 1887 [Meiolaniformes]
  • Meiostylodon, Wang 1975 [Tillodontia]
  • Melanopelta, Shishkin 1967 [Plagiosauridae]
  • Melanosuchus, Gray 1862 [Alligatoridae]
  • Melidellavus, L. Ginsburg 1961 [Mustelidae]
  • Mellivora, Storr 1780 [Mustelidae]
  • Mellivorodon, Lydekker 1884 [Felidae]
  • Melodon, Zdansky 1924 [Mustelidae]
  • Melosauridae, family, Fritsch 1885 [Archegosauroidea]
  • Melosaurus, von Meyer 1857 [Melosauridae]
  • Melursus, Meyer 1793 [Ursidae]
  • Menelikia, Arambourg 1941 [Bovidae]
  • Meniscodon, Rütimeyer 1888 [Dichobunidae]
  • Meroehyrax, Whitworth 1954 [Pliohyracidae]
  • Meropidae, family, Vigors 1825 [Coraciiformes]
  • Mertensiella, Wolterstorff 1925 [Salamandridae]
  • Merycoidodontoidea, superfamily [Tylopoda]
  • Merycopotamus, Falconer and Cautley 1847 [Anthracotheriidae]
  • Mesaceratherium, K. Keissig 1969 [Rhinocerotidae]
  • Meschotherium, Gabunia 1964 [Rhinocerotidae]
  • Mesembriacerus, Bouvrain 1975 [Bovidae]
  • Mesembriportax, Gentry 1974 [Bovidae]
  • Mesenosauridae, family [Diapsida]
  • Mesenosaurus, Efremov 1938 [Varanopidae]
  • Mesitornithidae, family, Wetmore 1960 [Turniciformes]
  • Mesochoerus, Shaw and Cooke 1941 [Suidae]
  • Mesomephitis, G. Petter 1967 [Mustelidae]
  • Mesonychia, order [Acreodi]
  • Mesonychidae, family, E. D. Cope 1880 [Acreodi]
  • Mesosuchia, suborder, T. H. Huxley 1875 [Crocodyliformes]
  • Mesosuchus, Watson 1912 [Rhynchosauria]
  • Mesotheriidae, family, Alston 1876 [Notoungulata]
  • Mesotherium, Serres 1867 [Mesotheriidae]
  • Messelobunodon, Franzen 1980 [Dichobunidae]
  • Metacervulus, Teilhard de Jardin and Trassaert 1937 [Cervidae]
  • Metacheiromyidae, family, Wortman 1903 [Palaeanodonta]
  • Metacordylodon, Schlosser 1911 [Dimylidae]
  • Metacoryphodon, Chow and Qi 1982 [Coryphodontidae]
  • Metahapalodectes, Dashzeveg 1976 [Mesonychidae]
  • Metailurus, Zdansky 1924 [Felidae]
  • Metarctos, Gaudry 1860 [Ursidae]
  • Metatitan, Granger and Gregroy 1943 [Brontotheriidae]
  • Meteutatus, F. Ameghino 1902 [Dasypodidae]
  • Metoposaurus, R. Lydekker 1890 [Metoposauridae]
  • Metopotoxus, F. Ameghino 1895 [Glyptodontidae]
  • Metridiochoerus, Hopwood 1926 [Suidae]
  • Metriorhynchidae, family, Fitzinger 1843 [Reptilia]
  • Metriotherium, Filhol 1882 [Dichobunidae]
  • Meyasaurus, Vidal 1915 [Squamata]
  • Miacoidea, superfamily, E. D. Cope [Carnivora]
  • Micoureus, Lesson 1842 [Didelphidae]
  • Micranteosaurus, Boonstra 1954 [Anteosauridae]
  • Microbrachidae, family, Fritsch 1883 [Microbrachomorpha]
  • Microbrachis, Fric 1876 [Lepospondyli]
  • Microbunodon, Depéret 1908 [Hippopotamoidea]
  • Microchiroptera, suborder, G. E. Dobson 1875 [Chiroptera]
  • Microhylidae, family, Günther 1858 [Salientia]
  • Microhyus, Teilhard de Chardin 1927 [Louisinidae]
  • Micromelerpeton, Bulman and Whittard 1926 [Micromelerpetontidae]
  • Micromelerpetontidae, family, Boy 1972 [Dissorophoidea]
  • Micromeryx, Lartet 1851 [Moschidae]
  • Micropternodontidae, family [Insectivora]
  • Microstonyx, Pilgrim 1926 [Suidae]
  • Microtheledon, Broom 1936 [Procolophonidae]
  • Microtitan, Granger and Gregory 1943 [Brontotheriidae]
  • Microtragus, Andres 1926 [Bovidae]
  • Miguelsoria, Cifelli 1983 [Protolipternidae]
  • Milleretta, Broom 1948 [Millerettidae]
  • Millerettidae, family, Romer 1956 [Parareptilia]
  • Millerettoides, Broom 1948 [Millerettidae]
  • Millerettops, Broom 1948 [Millerettidae]
  • Millerosauroidea, suborder [Captorhinida]
  • Millerosaurus, Broom 1948 [Millerettidae]
  • Milnea, Lydekker 1891 [Threskiornithidae]
  • Mimeosaurus, C. W. Gilmore 1943 [Squamata]
  • Mimolagus, Bohlin 1951 [Duplicidentata]
  • Minerva, R. W. Shufeldt 1915 [Xenarthra]
  • Mioachoerus [Dichobunidae]
  • Miocepphus, Wetmore 1940 [Alcidae]
  • Mioclaenidae, family, Osborn and Earle 1895 [Ungulata]
  • Mioechinus, P. M. Butler 1948 [Erinaceidae]
  • Miofulica, Lambrecht 1933 [Rallidae]
  • Mioglareola, Ballmann 1979 [Glareolidae]
  • Miohyaena, Kretzoi 1938 [Hyaenidae]
  • Miomachairodus, N. Schmidt-Kittler 1976 [Felidae]
  • Miomephitis, R. Dehm 1950 [Mustelidae]
  • Mionatrix, Sun 1961 [Colubridae]
  • Miopelobates, Wettstein-Westersheimb 1955 [Pelobatidae]
  • Miophasianus, Lambrecht 1933 [Phasianidae]
  • Mioproteus, Estes and Darevsky 1978 [Proteidae]
  • Miorallus, Lambrecht 1933 [Rallidae]
  • Miortyx, Miller 1944 [Phasianidae]
  • Miotragocerus, Stromer 1928 [Bovidae]
  • Mirandatherium, Paula Couto 1952 [Microbiotheriidae]
  • Mixosauridae, family, G. Baur 1887 [Ichthyosauria]
  • Mixtotherium, H. Filhol 1880 [Mixtotheriidae]
  • Mnemeiosaurus, Nopcsa 1923 [Brithopodidae]
  • Moeritheriidae, family, C.W. Andrews 1906 [Proboscidea]
  • Moeritherioidea, suborder [Proboscidea]
  • Moeritherium, C.W. Andrews 1901 [Moeritheriidae]
  • Moiachoerus, Golpe-Posse 1972 [Cebochoeridae]
  • Molgophis, Cope 1868 [Lysorophidae]
  • Molossidae, family, Gervais 1856 [Chiroptera]
  • Molybdopygus, Tchudinov 1964 [Estemmenosuchidae]
  • Momotidae, family, Gray 1840 [Motmotidae]
  • Mongolestes, Szalay and Gould 1966 [Mesonychidae]
  • Mongolonyx, Szalay and Gould 1966 [Mesonychidae]
  • Monodelphis, Burnett 1830 [Didelphidae]
  • Monotremata, order, C. L. Bonaparte 1838 [Mammalia]
  • Mormosaurus, Watson 1914 [Tapinocephalidae]
  • Moropomorpha, suborder [Perissodactyla]
  • Moschorhinidae, family, Brink 1958 [Theriodontia]
  • Moschorhinus, Broom 1920 [Moschorhinidae]
  • Moschosaurus, Haughton 1915 [Tapinocephalidae]
  • Moschowhaitsia, Tatarinov 1963 [Whaitsiidae]
  • Mouillacitherium, Filhol 1882 [Dichobunidae]
  • Mourasuchus, Price 1964 [Alligatoridae]
  • Muchocephalus, Watson 1962 [Rhinesuchidae]
  • Mungos, E. Geoffroy Saint Hilaire and G. Cuvier 1795 [Herpestidae]
  • Muntiacus, Rafinesque 1815 [Cervidae]
  • Muridae, family, Illiger 1811 [Rodentia]
  • Muroidea, superfamily, Illiger 1811 [Rodentia]
  • Musophaga [Musophagidae]
  • Musophagidae, family, Bonaparte 1831 [Musophagi]
  • Mustelictis, Lange 1969 [Carnivora]
  • Mustelidae, family, G. Fischer 1817 [Carnivora]
  • Mygalea, A. Schreuder 1940 [Talpidae]
  • Mygalinia, A. Schreuder 1940 [Talpidae]
  • Mygatalpa, A. Schreuder 1940 [Talpidae]
  • Mylagaulidae, family, E.D. Cope 1881 [Rodentia]
  • Mylodontidae, family, Gill 1872 [Xenarthra]
  • Mylodontoidea, superfamily [Xenarthra]
  • Myocephalus, Broom 1936 [Procolophonidae]
  • Myognathus [Procolophonidae]
  • Myophiomyidae, family, R. Lavocat 1973 [Rodentia]
  • Myosauroides, Broom 1949 [Emydopidae]
  • Myosaurus, Haughton 1917 [Emydopoidea]
  • Myosorex, Gray 1838 [Soricidae]
  • Myotragus, Bate 1909 [Bovidae]
  • Myrmecophagidae, family, Gray 1825 [Xenarthra]
  • Mystriosaurus, Munster 1834 [Thalattosuchia]
  • Myzopodidae, family, Milne-Edwards and A. Grandidier 1878 [Chiroptera]
  • Naemorhaedus, Jardine 1836 [Bovidae]
  • Naja, J. N. Laurenti 1768 [Elapidae]
  • Nanchangasaurus [Hupehsuchidae]
  • Nanicticephalus, Broom 1940 [Scaloposauridae]
  • Nanictops [Ictidosuchidae]
  • Nanlingilambda, Tong 1979 [Pantolambdodontidae]
  • Nanocynodon, Tatarinov 1968 [Galesauridae]
  • Nanomilleretta, Broom 1948 [Millerettidae]
  • Nanoparia, Broom 1936 [Pareiasauridae]
  • Natalidae, family, Gray 1866 [Chiroptera]
  • Natrix, J. N. Laurenti 1768 [Colubridae]
  • Neanis, Brodkorb 1965 [Coraciiformes]
  • Nebraskophis, J. A. Holman 1973 [Colubridae]
  • Necromanis, Filhol 1893 [Patriomanidae]
  • Necrosauridae, family, R. Hoffstetter 1943 [Squamata]
  • Necrosaurus, H. Filhol 1876 [Necrosauridae]
  • Necrosuchus, Simpson 1937 [Alligatoridae]
  • Necturus, Rafinesque [Proteidae]
  • Neldasaurus, Chase 1965 [Dvinosauria]
  • Nematherium, F. Ameghino 1887 [Mylodontidae]
  • Neoaetosauroides, J. F. Bonaparte 1969 [Aetosaurinae]
  • Neochelys, Bergounioux 1954 [Testudines]
  • Neococcyx, Weigel 1963 [Cuculidae]
  • Neogaeornis, K. Lambrecht 1929 [Gaviiformes]
  • Neomatronella, Russell et al. 1975 [Amphilemuridae]
  • Neomys, Kaup 1829 [Soricidae]
  • Neonatrix, J. A. Holman 1973 [Colubridae]
  • Neonematherium, F. Ameghino 1904 [Mylodontidae]
  • Neophrontops, Miller 1916 [Accipitridae]
  • Neosaurus, Nopsca 1923 [Sphenacodontidae]
  • Neotamandua, Rovereto 1914 [Myrmecophagidae]
  • Neothoracophorus, F. Ameghino 1889 [Glyptodontidae]
  • Nerodia, Baird and Girard 1853 [Colubridae]
  • Nesiotites, Bate 1945 [Soricidae]
  • Nesodon, R. Owen 1846 [Toxodontidae]
  • Nesodonopsis, Roth 1898 [Toxodontidae]
  • Nesohippus, F. Ameghino 1904 [Notohippidae]
  • Nesotrochis, Wetmore 1918 [Rallidae]
  • Nestoritherium, Kaup 1859 [Chalicotheriidae]
  • Neurankylidae, family [Baenidae]
  • Neurogymnurus, Filhol 1877 [Erinaceidae]
  • Neuryurus, F. Ameghino 1889 [Glyptodontidae]
  • Neusibatrachus, Seiffert 1972 [Salientia]
  • Newtonella, Broom 1937 [Dicynodontia]
  • Nicrosaurus, O. Fraas 1866 [Phytosauridae]
  • Niolamia, F. Ameghino 1899 [Meiolaniidae]
  • Nisidorcas, Bouvrain 1979 [Bovidae]
  • Nopachtus, F. Ameghino 1888 [Glyptodontidae]
  • Noripterus, C.-C. Young 1973 [Dsungaripteridae]
  • Nothoprocta, Sclater and Salvin 1873 [Tinamidae]
  • Nothosauridae, family, Baur 1889 [Eosauropterygia]
  • Nothura, Wagler 1827 [Tinamidae]
  • Notiomastodon, Cabrera 1929 [Gomphotheriidae]
  • Notioprogonia, suborder, Simpson 1934 [Notoungulata]
  • Notobatrachus, O. A. Reig 1956 [Batrachia]
  • Notochoerus, Broom 1925 [Suidae]
  • Notodiaphorus, Loomis 1914 [Macraucheniidae]
  • Notohippidae, family, F. Ameghino 1894 [Litopterna]
  • Notohippus, F. Ameghino 1891 [Notohippidae]
  • Notophthalmus, Rafinesque 1820 [Salamandridae]
  • Notosauria, order (Baur 1889) [Sauropterygia]
  • Notosuchidae, family, L. Dollo 1924 [Ziphosuchia]
  • Notosyodon, Chudinov 1968 [Brithopodidae]
  • Nyanzachoerus, L.S.B. Leakey 1958 [Suidae]
  • Nyctanassa, Stejneger 1887 [Ardeidae]
  • Nyctereutes, Temminck 1839 [Canidae]
  • Nycteroleteridae, family, Romer 1956 [Nyctiphruretia]
  • Nycticonodon, Quinet 1964 [Soricomorpha]
  • Nycticorax, T. Forster 1817 [Ardeidae]
  • Nyctisauria, infraorder [Squamata]
  • Nyctitheriidae, family, G. G. Simpson 1928 [Soricomorpha]
  • Oblitavis, Mourer-Chauvire 1983 [Idiornithidae]
  • Ocadia, Gray 1870 [Emydidae]
  • Occitaniavis, Mourer-Chauvire 1983 [Idiornithidae]
  • Oceanites, Keyserling and Blasius 1840 [Oceanitidae]
  • Oceanitidae, family, Forbes 1882 [Procellariiformes]
  • Ochotonidae, family, Thomas 1897 [Lagomorpha]
  • Ocnerotherium, Pascual 1954 [Toxodontidae]
  • Octodontidae, family, Waterhouse 1839 [Rodentia]
  • Octodontoidea, superfamily, Waterhouse 1839 [Rodentia]
  • Octodontotherium, F. Ameghino 1894 [Mylodontidae]
  • Octomylodon, F. Octomylodon 1904 [Mylodontidae]
  • Odonterpeton, Moodie 1909 [Odonterpetontidae]
  • Odonterpetontidae, family, Carroll and Gaskill 1978 [Microbrachomorpha]
  • Odontognathae, superorder, A. Wetmore 1930 [Reptilia]
  • Odontopterygia, suborder, Spulski 1910 [Pelecaniformes]
  • Odontopteryx, Owen 1873 [Pelagornithidae]
  • Ogmophis, E. D. Cope 1844 [Boidae]
  • Ogygoptynx, Rich and Bohaska 1976 [Ogygoptyngidae]
  • Oioceros, Gaillard 1902 [Bovidae]
  • Oldfieldthomasiidae, family, G.G. Simpson 1945 [Notoungulata]
  • Oligodontosauridae, family, R. Estes 1975 [Squamata]
  • Oligosorex, Kretzoi 1959 [Soricidae]
  • Olonbulukia, Bohlin 1937 [Bovidae]
  • Olsenia, Matthew and Granger 1925 [Chalicotheriidae]
  • Omoiotyphlops, de Rochebrune 1884 [Squamata]
  • Omphalosauridae, family, Merriam 1906 [Ichthyosauria]
  • Onactornis, Cabrera 1939 [Phorusrhacidae]
  • Onchiodon, Geinitz 1861 [Eryopidae]
  • Ophiacodon, Marsh 1878 [Ophiacodontidae]
  • Ophiacodontidae, family, Nopsca 1923 [Eupelycosauria]
  • Ophiderpeton, Huxley 1866 [Ophiderpetontidae]
  • Ophiderpetontidae, family, Schwarz 1908 [Aistopoda]
  • Ophidium, C. Linnaeus 1758 [Ophidia]
  • Ophipseudopus, Kuhn 1940 [Anguidae]
  • Ophisauriscus, Kühn 1940 [Anguidae]
  • Ophisaurus, Daudin 1803 [Anguidae]
  • Opisthias, C. W. Gilmore 1909 [Sphenodontidae]
  • Opisthocomidae, family, Swainson 1837 [Opisthocomiformes]
  • Opisthodactylidae, family, Ameghino 1895 [Struthioniformes]
  • Opisthodactylus, Ameghino 1891 [Opisthodactylidae]
  • Oplurus, Cuvier 1829 [Opluridae]
  • Orasius, Oken 1816 [Bovidae]
  • Orchonoceros, Vislobokova 1979 [Bovidae]
  • Oreonager, Pomel 1895 [Bovidae]
  • Oreopithecidae, family, Schwalbe 1915 [Hominidae]
  • Oreotragus, Smith 1834 [Bovidae]
  • Oriadubitherium [Toxodontidae]
  • Ornimegalonyx [Strigidae]
  • Ornithocheiridae, family, H. G. Seeley 1870 [Reptilia]
  • Ornithorhynchidae, family, Gray 1825 [Monotremata]
  • Ornithorhynchus, Blumenbach 1800 [Ornithorhynchidae]
  • Ornithosuchia, suborder, Huene 1908 [Crurotarsi]
  • Ornithosuchidae, family, Huene 1908 [Pseudosuchia]
  • Ornithosuchus, E. T. Newton 1894 [Reptilia]
  • Oroklambda, Dashzeveg 1980 [Pantolambdodontidae]
  • Oromerycidae, family, Gazin 1955 [Tylopoda]
  • Orophodon, F. Ameghino 1894 [Orophodontidae]
  • Orthaspidotherium, Lemoine 1885 [Pleuraspidotheriidae]
  • Orthophyia, H. von Meyer 1845 [Proteidae]
  • Orycteropodidae, family, Gray 1821 [Tubulidentata]
  • Orycteropus, Geoffroy 1791 [Orycteropodidae]
  • Orygotherium, H. von Meyer 1838 [Bovidae]
  • Oryx, de Blainville 1816 [Bovidae]
  • Osteolaemus, Cope 1860 [Crocodylidae]
  • Osteophorus, von Meyer 1956 [Eryopidae]
  • Ostodolepidae, family, Romer 1945 [Ostodolepidae]
  • Otarioidea, superfamily, F. A. Lucas 1899 [Carnivora]
  • Othnielmarshia, F. Ameghino 1901 [Henricosborniidae]
  • Otididae, family, Gray 1840 [Gruiformes]
  • Otocyon, Müller 1835 [Canidae]
  • Ototriton, Loomis 1919 [Rhineuridae]
  • Otronia, Roth 1901 [Notostylopidae]
  • Otsheria, Chudinov 1960 [Venyukovioidea]
  • Otus, Pennant 1769 [Strigidae]
  • Oudenodontidae, family, Broom 1935 [Cryptodontidae]
  • Oviraptoridae, family, R. Barsbold 1976 [Maniraptora]
  • Oweniasuchus, Woodward 1885 [Goniopholididae]
  • Oxyaenidae, family, E. D. Cope 1877 [Creodonta]
  • Pachybiotherium, Ameghino 1902 [Microbiotheriidae]
  • Pachycrocuta, Kretzoi 1938 [Hyaenidae]
  • Pachygazella, Teilhard de Jardin and Young 1931 [Bovidae]
  • Pachyhyrax, Schlosser 1910 [Pliohyracidae]
  • Pachyornis, Lydekker 1891 [Emeidae]
  • Pachypleurosauridae, family, Nopcsa 1928 [Eosauropterygia]
  • Pachyportax, Pilgrim 1937 [Bovidae]
  • Pachyrukhos, F. Ameghino 1885 [Hegetotheriidae]
  • Pachystropheus, von Huene 1935 [Choristodera]
  • Pachytegos, S. H. Haughton 1932 [Endothiodontidae]
  • Pachytitan, Granger and Gregory 1943 [Brontotheriidae]
  • Pachytragus, Schlosser 1904 [Bovidae]
  • Pachyvaranus, Arambourg 1952 [Squamata]
  • Padiochelys [Thalassemyidae]
  • Paedsotherium, Burmeister 1888 [Hegetotheriidae]
  • Paenelimnoecus, S. Baudelot 1972 [Soricidae]
  • Paginula, F. Ameghino 1901 [Oldfieldthomasiidae]
  • Palacrodon, Broom 1906 [Sphenodontidae]
  • Palaeagama, Broom 1926 [Lepidosauromorpha]
  • Palaeanodonta, suborder, W. D. Matthew 1918 [Pholidotamorpha]
  • Palaeaspis, Gray 1870 [Testudines]
  • Palaelodus, Milne-Edwards 1863 [Paloelodidae]
  • Palaeoamasia, Ozansoy 1966 [Palaeoamasidae]
  • Palaeobatrachidae, family, E. D. Cope 1865 [Salientia]
  • Palaeobatrachus, Tschudi 1839 [Palaeobatrachidae]
  • Palaeochenoides, Shufeldt 1916 [Pelagornithidae]
  • Palaeocryptonyx, Depéret 1892 [Phasanidae]
  • Palaeodoedicurus, Castellanos 1927 [Glyptodontidae]
  • Palaeoephippiorhynchus, Lambrecht 1930 [Ciconiidae]
  • Palaeognathae, superorder, Pycraft 1900 [Reptilia]
  • Palaeogramides [Rallidae]
  • Palaeogrus, Portis 1884 [Gruidae]
  • Palaeoherpeton, Panchen 1970 [Eogyrinidae]
  • Palaeohierax, Milne-Edwards 1871 [Accipitridae]
  • Palaeohoplophorus, F. Ameghino 1883 [Glyptodontidae]
  • Palaeohypsodontus, Trofimov 1958 [Ruminantia]
  • Palaeolacerta, Cocude-Michel 1961 [Ardeosauridae]
  • Palaeomalpolon, Szyndlar 1981 [Colubridae]
  • Palaeomastodon, C.W. Andrews 1901 [Proboscidea]
  • Palaeomeles, de Villalta Comella and Crusafont Pairó 1943 [Mustelidae]
  • Palaeomerycidae, family, Lydekker 1883 [Cervoidea]
  • Palaeomolgophis, Brough and Brough 1967 [Adelogyrinidae]
  • Palaeomyrmedon, Roverto 1914 [Myrmecophagidae]
  • Palaeonaja, R. Hoffstetter 1939 [Elapidae]
  • Palaeonatrix, Szyndlar 1982 [Colubridae]
  • Palaeopeltidae, family, F. Ameghino 1894 [Xenarthra]
  • Palaeopeltis, F. Ameghino 1895 [Palaeopeltidae]
  • Palaeophasianus, R. W. Shufeldt 1913 [Aramidae]
  • Palaeophidae, family [Ophidia]
  • Palaeopleurodeles, Herre 1941 [Salamandridae]
  • Palaeoprionodon, Filhol 1880 [Carnivora]
  • Palaeopropithecidae, family, Tattersall 1973 [Primates]
  • Palaeoproteus, Herre 1935 [Batrachosauroididae]
  • Palaeopsittacus, Harisson 1982 [Psittacidae]
  • Palaeopython, Rochebrune 1880 [Boidae]
  • Palaeoreas, Gaudry 1861 [Bovidae]
  • Palaeortyx, Milne-Edwards 1869 [Phasianidae]
  • Palaeoryctidae, family, Winge 1917 [Eutheria]
  • Palaeoryx, Gaudry 1861 [Bovidae]
  • Palaeoscinidae, family, Howard 1957 [Passeriformes]
  • Palaeoscinis, Howard 1957 [Palaeoscinidae]
  • Palaeotapirus, Filhol 1888 [Tapiridae]
  • Palaeotis, Lambrecht 1928 [Struthionidae]
  • Palaeotodus, Olson 1976 [Todidae]
  • Palaeotoxodon, F. Ameghino 1904 [Toxodontidae]
  • Palaeotragus, Gaudry 1861 [Giraffidae]
  • Palaeoxantusia, Hecht 1956 [Xantusiidae]
  • Palasiodon, Chow et al. 1976 [Hyopsodontidae]
  • Paleofarancia, Auffenberg 1963 [Colubridae]
  • Paleoheterodon, J. A. Holman 1964 [Colubridae]
  • Paleosuchus, Gray 1862 [Alligatoridae]
  • Paleryx, R. Owen 1850 [Boidae]
  • Paleuphractus, Kraglievich 1934 [Dasypodidae]
  • Paliguanidae, family, Broom 1926 [Lepidosauria]
  • Palinhyaena, Qiu et al. 1979 [Hyaenidae]
  • Pallimnarchus, De Vis 1886 [Crocodylidae]
  • Pallisteria, Charig 1967 [Thecodontia]
  • Paloplotherium [Pachynolophidae]
  • Paludavis [Balaenicipitidae]
  • Palyeidodon, Roth 1898 [Toxodontidae]
  • Pandion, Savigny 1809 [Pandionidae]
  • Pandionidae, family, Sclater and Salvin 1873 [Falconiformes]
  • Pannonictis, Kormos 1931 [Mustelidae]
  • Panochthus, Burmeister 1866 [Glyptodontidae]
  • Pantholops, Hodgson 1934 [Bovidae]
  • Pantodonta, order, E.D. Cope 1873 [Cimolesta]
  • Pantolambdidae, family, E.D. Cope 1883 [Pantodonta]
  • Pantolambdodon, Granger and Gregory 1934 [Pantolambdodontidae]
  • Pantolambdodontidae, family, Granger and Gregory 1934 [Pantolambdoidea]
  • Pantylidae, family, Case 1911 [Tuditanomorpha]
  • Pappaceras, Wood 1963 [Hyracodontidae]
  • Pappidictops, Chiu and Li 1977 [Carnivoramorpha]
  • Papposaurus, Watson 1914 [Proterogyrinidae]
  • Parabenthosuchus, Ochev 1958 [Capitosauria]
  • Parabrachyodus, Forster-Cooper 1915 [Anthracotheriidae]
  • Parabradysaurus, Efremov 1954 [Estemmenosuchidae]
  • Parabreviodon, Reshetov 1975 [Lophialetidae]
  • Parabrontops, Granger and Gregory 1943 [Brontotheriidae]
  • Paracadurcodon, Xu 1966 [Amynodontidae]
  • Paracathartes, Harrison 1979 [Lithornithidae]
  • Paraceratherium, Forster Cooper 1911 [Indricotheriidae]
  • Paracervulus, Teilhard de Chardin and Trassaert 1937 [Cervidae]
  • Paracochilius, Bordas 1939 [Interatheriidae]
  • Paracolodon, Matthew and Granger 1925 [Perissodactyla]
  • Paracoluber, J.A. Holman 1970 [Colubridae]
  • Paracontogenys, Schatzinger 1977 [Xantusiidae]
  • Paracrax, Brodkorb 1964 [Bathornithidae]
  • Paractitis, Weigel 1963 [Scolopacidae]
  • Paracyclotosaurus, D. M. S. Watson 1958 [Capitosauroidea]
  • Paradiceros, Hooijer 1968 [Rhinocerotidae]
  • Paradidelphys, Ameghino 1904 [Didelphidae]
  • Paradipsosaurus, Fries et al. 1955 [Iguanidae]
  • Paraentelodon, Gabunia 1964 [Entelodontidae]
  • Paraepicrates, Hecht 1959 [Boidae]
  • Paraeuphractus, Scillato-Yané 1980 [Dasypodidae]
  • Paragale, G. Petter 1967 [Mustelidae]
  • Paragalerhinus, Sigogneau 1970 [Gorgonopsidae]
  • Parageogale, Butler 1984 [Tenrecidae]
  • Paragerrhonotus, Estes 1963 [Anguidae]
  • Paraglyptodon, Castellanos 1932 [Glyptodontidae]
  • Paraglyptosaurus, Sullivan 1979 [Anguidae]
  • Paragrus, Lambrecht 1933 [Geranoididae]
  • Parahydraspis, Wieland 1923 [Chelidae]
  • Paralichelys, Bergounioux 1935 [Pelomedusidae]
  • Paralligator, Konjukova 1954 [Neosuchia]
  • Paralligatoridae, family, Konjukova 1954 [Mesoeucrocodylia]
  • Paralophiodon, Dedieu 1977 [Isectolophidae]
  • Paramachaerodus, Pilgrim 1913 [Felidae]
  • Paramacrauchenia, Bordas 1939 [Macraucheniidae]
  • Paramynodon, Matthew 1829 [Amynodontidae]
  • Paranictops, Qiu 1977 [Pseudictopidae]
  • Paranourosorex, B. Rzebik-Kowalska 1975 [Soricidae]
  • Paranteosaurus, Boonstra 1954 [Anteosauridae]
  • Paranthodon, Nopcsa 1929 [Stegosauria]
  • Paraortygometra, Lambrecht 1933 [Rallidae]
  • Paraoxybelis, Auffenberg 1963 [Colubridae]
  • Parapeltecoelus, Bordas 1938 [Xenarthra]
  • Parapithecidae, family, Schlosser 1911 [Primates]
  • Parapithecoidea, superfamily, Schlosser 1911 [Primates]
  • Paraprionosaurus, C. W. Gilmore 1938 [Squamata]
  • Paraprotoryx, Bohlin 1935 [Bovidae]
  • Parapseudopus, Kühn 1840 [Anguidae]
  • Pararallus, Lambrecht 1933 [Rallidae]
  • Pararctotherium, Ameghino 1904 [Ursidae]
  • Parasaurus, H. von Meyer 1857 [Pareiasauria]
  • Parastrapotherium, Ameghino 1895 [Astrapotheriidae]
  • Parasuchus, Lydekker 1885 [Phytosauria]
  • Paratalpa, R. Lavocat 1951 [Talpidae]
  • Parathrinaxodon, Parrington 1936 [Procynosuchidae]
  • Paratrigodon, Cabrera and Kraglievich 1931 [Toxodontidae]
  • Paratrogon, Lambrecht 1933 [Trogonidae]
  • Paravaranidae, family, M. Borsuk-Bialynicka 1984 [Squamata]
  • Paravaranus, M. Borsuk-Bialynicka 1984 [Paravaranidae]
  • Pardirallus, Bonaparte 1856 [Rallidae]
  • Pareiasauridae, family, Lydekker 1889 [Pareiasauridae]
  • Pareiasauroidea, superfamily, Nopsca 1928 [Hallucicrania]
  • Parioxyidae, family, Moustafa 1955 [Eryopoidea]
  • Parioxys, E.D. Cope 1878 [Parioxyidae]
  • Parmularius, Hopwood 1934 [Bovidae]
  • Paroedura, Günther 1879 [Gekkonidae]
  • Paromomyoidea, superfamily, G. G. Simpson 1940 [Primates]
  • Paroodectes, Springhorn 1980 [Carnivoramorpha]
  • Parotosuchus, Ochev and Shishkin 1968 [Capitosauroidea]
  • Paroxyclaenidae, family, K. Weitzel [Condylarthra]
  • Parringtoniella, Toerien 1953 [Dicynodontia]
  • Parurmiatherium, Sickenberg 1932 [Bovidae]
  • Parviderma, M. Borsuk-Bialynicka 1984 [Squamata]
  • Paschatherium, Russell 1963 [Louisinidae]
  • Passeriformes, order, Linnaeus 1758 [Reptilia]
  • Passerina, Vieillot 1816 [Fringillidae]
  • Pastoralodon, Chow and Qi 1978 [Pastoralodontidae]
  • Pastoralodontidae, family, Chow and Qi 1978 [Pantolambdoidea]
  • Pataecops, Radinsky 1966 [Lophialetidae]
  • Paulogervaisia, F. Ameghino 1901 [Didolodontidae]
  • Pecarichoerus, Colbert 1933 [Tayassuidae]
  • Pectinodon, K. Carpenter 1982 [Troodontidae]
  • Pedeticosauridae, family, E. C. N. Van Hoepen 1915 [Pedeticosauria]
  • Pedeticosaurus, E. C. N. Van Hoepen 1915 [Pedeticosauridae]
  • Pedetidae, family, Gray 1825 [Rodentia]
  • Pedetoidea, superfamily [Rodentia]
  • Pedionomidae, family, Gadow 1893 [Charadriiformes]
  • Peirosaurus, L. I. Price 1955 [Peirosauridae]
  • Pelagornis, Lartet 1857 [Pelagornithidae]
  • Pelagornithidae, family, Fürbringer 1888 [Reptilia]
  • Pelargopappus, Stejneger 1885 [Sagittariidae]
  • Pelea, Gray 1851 [Peleinae]
  • Pelecani, suborder [Pelecaniformes]
  • Pelecanidae, family, Vigors 1825 [Pelecaniformes]
  • Pelecanoididae, family, Gray 1871 [Procellariiformes]
  • Pelecyodon, F. Ameghino 1891 [Xenarthra]
  • Pelobates, Wagler 1830 [Pelobatidae]
  • Pelobatidae, family, Lataste 1879 [Salientia]
  • Pelocomastes, Vis 1897 [Chelidae]
  • Pelodytidae, family, E. D. Cope 1866 [Salientia]
  • Pelomedusa, Wagler 1830 [Testudines]
  • Pelomedusidae, family, Cope 1868 [Testudines]
  • Pelophilus, Tschudi 1838 [Discoglossidae]
  • Pelorocephalus, Cabrera 1944 [Chigutisauridae]
  • Pelorovis, Reck 1928 [Bovidae]
  • Peltecoelus, F. Ameghino 1902 [Xenarthra]
  • Peltephilus, F. Ameghino 1887 [Xenarthra]
  • Peltobatrachidae, family, Kuhn 1960 [Rhinesuchoidea]
  • Peltobatrachus, A. L. Panchen 1959 [Stereospondyli]
  • Peltosaurus, Cope 1872 [Squamata]
  • Pelurocoelodon [Isotemnidae]
  • Pentalophodon, Falconer 1857 [Gomphotheriidae]
  • Peramuridae, family, Kretzoi 1946 [Peramura]
  • Peratosauroides, Naylor 1980 [Batrachosauroididae]
  • Peratotherium [Didelphidae]
  • Percrocuta, Kretzoi 1938 [Percrocutidae]
  • Perhippidion, F. Ameghino 1904 [Notohippidae]
  • Perimia, Pilgrim 1939 [Bovidae]
  • Peripantostylops, F. Ameghino 1904 [Henricosborniidae]
  • Periphragnis, Roth 1899 [Isotemnidae]
  • Periptychidae, family, E. D. Cope 1882 [Bulbulodentata]
  • Perparvus [Kuehneosauridae]
  • Perunium, Orlov 1947 [Mustelidae]
  • Peshanemys [Dermatemydidae]
  • Petrosuchus, Owen 1878 [Goniopholididae]
  • Pezophaps, Strickland 1848 [Raphidae]
  • Phacochoerus, F. Cuvier 1826 [Suidae]
  • Phaethontes, suborder, Sharpe 1891 [Pelecaniformes]
  • Phaethontidae, family, Brandt 1831 [Pelecaniformes]
  • Phalacrocoracidae, family, Reichenbach 1850 [Pelecaniformes]
  • Phalacrocorax, Brisson 1760 [Phalacrocoracidae]
  • Phascolotherium, R. Owen 1838 [Amphilestidae]
  • Phasianidae, family, Horsfield 1821 [Galliformes]
  • Phelsuma, Gray 1825 [Gekkonidae]
  • Phenacodontidae, family, Cope 1881 [Phenacodonta]
  • Phiomia, Andrews and Beadnell 1902 [Phiomiidae]
  • Phiomorpha, infraorder, Lavocat 1962 [Rodentia]
  • Phiomyidae, family, A.E. Wood 1955 [Rodentia]
  • Phocosaurus, Seeley 1888 [Tapinocephalidae]
  • Phoeniconotius, Miller 1963 [Phoenicopteridae]
  • Phoenicopteridae, family, Bonaparte 1838 [Ciconiiformes]
  • Phoeniculidae, family, Sclater 1924 [Coraciiformes]
  • Phoenixauchenia, Ameghino 1904 [Macraucheniidae]
  • Pholiderpeton, Huxley 1896 [Eogyrinidae]
  • Pholidocercus, W. von Koenigswald and G. Storch 1983 [Amphilemuridae]
  • Pholidogaster, Huxley 1862 [Colosteidae]
  • Phoradiadius, Simpson et al. 1962 [Proterotheriidae]
  • Phorusrhacidae, family, Ameghino 1899 [Gruiformes]
  • Phorusrhacos, Ameghino 1887 [Phorusrhacidae]
  • Phreatophasma, Efremov 1954 [Caseidae]
  • Phrynops, Wagler 1830 [Testudines]
  • Phrynosoma, Wiegmann 1828 [Iguanidae]
  • Phthinosaurus, Efremov 1954 [Phthinosuchidae]
  • Phthinosuchidae, family, Efremov 1954 [Eotitanosuchia]
  • Phthinosuchus, Efremov 1954 [Phthinosuchidae]
  • Phyllodactylus, Gray 1828 [Gekkonidae]
  • Phyllostomatidae, family [Chiroptera]
  • Phyllostomatoidea, superfamily [Chiroptera]
  • Phyllotillon, Pilgrim 1910 [Chalicotheriidae]
  • Physornis, Ameghino 1895 [Brontornithidae]
  • Phytosauria, suborder, Jaeger 1828 [Crurotarsi]
  • Phytosauridae, family, Jaeger 1828 [Phytosauria]
  • Picidae, family, Vigors 1825 [Piciformes]
  • Piciformes, order, Meyer and Wolf 1810 [Reptilia]
  • Pilosa, infraorder, Flower 1883 [Xenarthra]
  • Pinaosuchus [Goniopholididae]
  • Pinguinus, Bonnaterre 1790 [Alcidae]
  • Pipidae, family, Gray 1825 [Salientia]
  • Pisanodon, Zetti 1972 [Toxodontidae]
  • Placodontidae, family, Cope 1871 [Placodontia]
  • Placosaurus, Gervais 1852 [Anguidae]
  • Plagiarthus [Interatheriidae]
  • Plagiocristodon, Chow and Qi 1978 [Mesonychidae]
  • Plagiorophus, Konjukova 1955 [Plagiosauridae]
  • Plagiosuchus, Huene 1922 [Plagiosauridae]
  • Planiplastron, Ckhikvadze 1971 [Chelydridae]
  • Planops, Ameghino 1887 [Megatheriidae]
  • Plastomenus, E. D. Cope 1873 [Trionychidae]
  • Plataleidae, family, Bonaparte 1838 [Ciconiiformes]
  • Platemys, Wagner 1830 [Chelidae]
  • Platybos, Pilgrim 1939 [Bovidae]
  • Platychelyidae, family, Bräm 1965 [Testudines]
  • Platycraniellus, van Hoepen 1917 [Epicynodontia]
  • Platyhystrix, Williston 1911 [Dissorophidae]
  • Platyrrhini, infraorder, E. Geoffroy 1812 [Primates]
  • Plaxhaplous, F. Ameghino 1884 [Glyptodontidae]
  • Plegadis, Kaup 1829 [Plataleidae]
  • Plesiaceratherium, Young 1937 [Rhinocerotidae]
  • Plesiadapidae, family, Trouessart 1897 [Primates]
  • Plesiadapiformes, suborder, Simons and Tattersall 1972 [Primates]
  • Plesiadapoidea, superfamily [Primates]
  • Plesiaddax, Schlosser 1903 [Bovidae]
  • Plesiocathartes, Gaillard 1908 [Cathartidae]
  • Plesiochelyidae, family, Rütimeyer 1873 [Testudines]
  • Plesiodimylus, C. Gaillard 1897 [Dimylidae]
  • Plesiogale, Pomel 1947 [Mustelidae]
  • Plesiolacerta, R. Hoffstetter 1942 [Lacertidae]
  • Plesiomegatherium, Roth 1911 [Megatheriidae]
  • Plesiomeles, J. Viret and M. Crusafont Pairo 1955 [Mustelidae]
  • Plesiorhineura, Sullivan 1985 [Rhineuridae]
  • Plesiorycteropus, Filhol 1895 [Tenrecoidea]
  • Plesiosauridae, family, Gray 1825 [Sauropterygia]
  • Plesiosauroidea, superfamily, S. P. Welles 1943 [Sauropterygia]
  • Plesiotortrix, Rochebrune 1884 [Boidae]
  • Plethodon, Tschudi 1838 [Plethodontidae]
  • Plethodontidae, family, Gray 1850 [Urodela]
  • Plethodontoidea, suborder [Urodela]
  • Pleuraspidotherium, Lemoine 1878 [Pleuraspidotheriidae]
  • Pleuroceros, Roger 1898 [Rhinocerotidae]
  • Pleurodeles, Michahelles 1830 [Salamandridae]
  • Pleurodira, suborder, E. D. Cope 1865 [Testudines]
  • Pleurosauridae, family, Lydekker 1888 [Diapsida]
  • Pleurosternidae, family, Cope 1868 [Testudines]
  • Pliobatrachus, Fejérváry 1917 [Palaeobatrachidae]
  • Pliocarbo, Tugarinov 1940 [Phalacrocoracidae]
  • Pliocervus, Hilzheimer 1922 [Cervoidea]
  • Pliogonodon, J. Leidy 1856 [Goniopholididae]
  • Pliogrus, Lambrecht 1933 [Gruidae]
  • Pliogyps, Tordoff 1959 [Cathartidae]
  • Pliohyracidae, family, Osborn 1899 [Hyracoidea]
  • Pliohyrax, Osborn 1899 [Pliohyracidae]
  • Pliopicus, Feduccia and Wilson 1967 [Picidae]
  • Pliopithecidae, family, Zapfe 1961 [Primates]
  • Pliosauridae, family, Seeley 1874 [Sauropterygia]
  • Pliosauroidea, superfamily, S. P. Welles 1943 [Sauropterygia]
  • Pliotragus, Kretzoi 1941 [Bovidae]
  • Plioviverrops, Kretzoi 1938 [Hyaenidae]
  • Plotornis, Milne-Edwards 1874 [Diomedeidae]
  • Podargidae, family [Caprimulgiformes]
  • Podiceps, Latham 1787 [Podicipedidae]
  • Podicipedidae, family, Bonaparte 1831 [Podicipediformes]
  • Podicipediformes, order, Fürbringer 1888 [Reptilia]
  • Podocnemis, Wagler 1830 [Testudines]
  • Polyacrodon, Roth 1899 [Proterotheriidae]
  • Polyborus, Vieillot 1816 [Falconidae]
  • Polymorphis, Roth 1899 [Proterotheriidae]
  • Polyptchodon [Pliosauridae]
  • Polysphenodon, Jaeckel 1911 [Sphenodontidae]
  • Polysternon, Portis 1882 [Bothremydidae]
  • Pongidae, family, Elliot 1913 [Hominidae]
  • Postosuchus, S. Chatterjee 1985 [Rauisuchidae]
  • Postpalerinaceus, Crusafont-Pairó and Villalta 1947 [Erinaceidae]
  • Postschizotherium, G.H.R. von Koenigswald 1932 [Pliohyracidae]
  • Potamochelys, Fitzinger 1843 [Bothremydidae]
  • Potamochoeroides, Dale 1948 [Suidae]
  • Potamochoerus, Ewer 1956 [Suidae]
  • Praemegaceros, Portis 1920 [Cervidae]
  • Pravoslavleria [Gorgonopsidae]
  • Prepotherium, F. Ameghino 1891 [Prepotheridae]
  • Presictis [Mustelidae]
  • Primelephas, Maglio 1970 [Elephantidae]
  • Primobucco, Brodkorb 1970 [Coraciiformes]
  • Prionosuchus, Price 1948 [Archegosauridae]
  • Pristerodontia, infraorder [Dicynodontia]
  • Pristerodontidae, family, Haughton and Brink 1954 [Pristerodontia]
  • Pristerognathidae, family [Theriodontia]
  • Pristichampsus, Gervais 1853 [Eusuchia]
  • Proaceratherium, L. Ginsburg and M. Hugueney 1980 [Rhinocerotidae]
  • Proailurus, Filhol 1879 [Carnivora]
  • Proamblysomus, Broom 1941 [Chrysochloridae]
  • Proamphibos, Pilgrim 1939 [Bovidae]
  • Proamphiuma, R. Estes 1969 [Amphiumidae]
  • Proanura, order, A. S. Romer 1945 [Salientia]
  • Proardea, Lambrecht 1933 [Ardeidae]
  • Probrachyodus, Xu and Chiu 1962 [Anthracotheriidae]
  • Proburnetia, Tatarinov 1968 [Burnetiidae]
  • Procamptoceras, Schaub 1923 [Bovidae]
  • Procapra, Hodgson 1846 [Bovidae]
  • Procapreolus, Schlosser 1929 [Cervidae]
  • Procavia, Storr 1780 [Procaviidae]
  • Procaviidae, family, Thomas 1892 [Hyracoidea]
  • Procellariidae, family, Vigors 1825 [Procellariiformes]
  • Prochrysochloris, Butler and Hopwood 1957 [Chrysochloridae]
  • Procobus, Khomenko 1913 [Bovidae]
  • Procolophonoides, Ivakhnenko 1979 [Procolophonidae]
  • Procynops, Young 1965 [Salamandridae]
  • Procynosuchia, infraorder [Epicynodontia]
  • Procynosuchidae, family, Broom 1937 [Procynosuchia]
  • Procynosuchus, Broom 1937 [Cynodontia]
  • Procyonidae, family, Gray 1825 [Carnivora]
  • Prodamaliscus, Schlosser 1904 [Bovidae]
  • Prodeinotherium, J. Ehik 1930 [Deinotheriidae]
  • Proectocion, F. Ameghino 1904 [Didolodontidae]
  • Proedrium, Ameghino 1894 [Mesotheriidae]
  • Proeuphractus, Ameghino 1886 [Dasypodidae]
  • Proganochelydia, suborder [Testudines]
  • Proganochelyidae, family [Testudines]
  • Progenetta, Deperet 1892 [Viverridae]
  • Progiraffa, Pilgrim 1908 [Giraffidae]
  • Progura, De Vis 1889 [Megapodiidae]
  • Proheptoconus, Bordas 1936 [Adianthidae]
  • Prohyracodon, Koch 1897 [Hyracodontidae]
  • Prohyrax, Stromer 1926 [Procaviidae]
  • Prolacerta, Parrington 1935 [Archosauromorpha]
  • Prolacertidae, family, Parrington 1935 [Protorosauria]
  • Proleptobos, Pilgrim 1939 [Bovidae]
  • Prolibytherium, Arambourg 1961 [Palaeomerycidae]
  • Prolicaphrium, Ameghino 1901 [Proterotheriidae]
  • Promacrauchenia, Ameghino 1904 [Macraucheniidae]
  • Promastodonsaurus, Bonaparte 1963 [Mastodonsauridae]
  • Promegatherium, F. Ameghino 1883 [Megatheriidae]
  • Promeles, Zittel 1893 [Mustelidae]
  • Promellivora, Pilgrim 1932 [Mustelidae]
  • Promephitis, Gaudry 1861 [Mustelidae]
  • Promesochoerus, L.S.B. Leakey 1965 [Suidae]
  • Prominatherium, Teller 1884 [Anthracotheriidae]
  • Promusophaga, Harrison and Walker 1977 [Lithornidae]
  • Propalaeochoerus, Stehlin 1899 [Suidae]
  • Propalaeomeryx, Lydekker 1883 [Giraffidae]
  • Propelargus, Lydekker 1891 [Idiornithidae]
  • Prophaethontidae, family, Harrison and Walker 1976 [Pelecaniformes]
  • Proplatyarthrus, F. Ameghino 1905 [Megalonychidae]
  • Proplatynotia, M. Borsuk-Bialynicka 1984 [Necrosauridae]
  • Propontosmilus, Kretzoi 1929 [Felidae]
  • Propotamochoerus, Pilgrim 1925 [Suidae]
  • Propraopus, F. Ameghino 1881 [Dasypodidae]
  • Proputorius, Filhol 1890 [Mustelidae]
  • Propyrotherium, F. Ameghino 1901 [Pyrotheriidae]
  • Prorubidgea, Broom 1940 [Gorgonopsidae]
  • Prosantorhinus, Heissig 1973 [Rhinocerotidae]
  • Proscalopidae, family [Insectivora]
  • Proscelidodon, Bordas 1935 [Megatheriidae]
  • Proschismotherium, F. Ameghino 1901 [Megatheriidae]
  • Prosimii, suborder, C. Illiger 1811 [Primates]
  • Prosinotragus, Bohlin 1935 [Bovidae]
  • Prostegotherium, F. Ameghino 1902 [Dasypodidae]
  • Prostrepsiceros, Forsyth Major 1891 [Bovidae]
  • Prosybris, Brodkorb 1970 [Tytonidae]
  • Protamandua, F. Ameghino 1904 [Myrmecophagidae]
  • Protanancus, Arambourg 1945 [Gomphotheriidae]
  • Protarctos, Kretzoi 1945 [Mustelidae]
  • Protechinus, Noetling 1897 [Erinaceidae]
  • Proteidae, family, Hogg 1838 [Urodela]
  • Protembolotherium, Yanovskaya 1954 [Brontotheriidae]
  • Protenrec, Butler and Hopwood 1957 [Tenrecidae]
  • Proteoidea, suborder [Proteoidea]
  • Proterochampsa, Reig 1959 [Proterochampsia]
  • Proterochersidae, family, Nopcsa 1928 [Testudinata]
  • Proterosuchia, suborder, Broom 1906 [Thecodontia]
  • Proterosuchidae, family, R. Broom 1906 [Archosauriformes]
  • Proterotheriidae, family, Ameghino 1887 [Litopterna]
  • Proterotherium, Ameghino 1883 [Proterotheriidae]
  • Proteus, Laurenti 1768 [Proteidae]
  • Prothoatherium, Ameghino 1902 [Proterotheriidae]
  • Proticia, B. Patterson 1977 [Pyrotheriidae]
  • Protictitherium, Kretzoi 1938 [Hyaenidae]
  • Protitan, Granger and Gregory 1943 [Brontotheriidae]
  • Protoaceratherium, Abel 1910 [Rhinocerotidae]
  • Protobatrachidae, family, Romer 1945 [Salientia]
  • Protochelydra, Erickson 1973 [Testudines]
  • Protognathus, Basilewsky 1950 [unclassified genus]
  • Protolipterna, Cifelli 1983 [Protolipternidae]
  • Protolipternidae, family [Litopterna]
  • Protopelicanus, Reichenbach 1852 [Pelecanidae]
  • Protornis, H. von Meyer 1844 [Motmotidae]
  • Protorosauria, order, Huxley 1871 [Archosauromorpha]
  • Protorosauridae, family, Lydekker 1888 [Protorosauria]
  • Protoryx, Forsyth Major 1891 [Bovidae]
  • Protosphargis, Capellini 1884 [Cheloniidae]
  • Protostegidae, family, Cope 1873 [Testudines]
  • Protosuchia, suborder, C. C. Mook 1934 [Crocodylomorpha]
  • Prototheria, subclass, Gill 1872 [Mammalia]
  • Prototheria, Gill 1872 [unclassified]
  • Prototocyon, Pohle 1928 [Canidae]
  • Protragelaphus, Dames 1883 [Bovidae]
  • Protragocerus, Deperet 1887 [Bovidae]
  • Protrogomorpha, infraorder, K. A. Zittel 1893 [Rodentia]
  • Protypotherium, F. Ameghino 1882 [Interatheriidae]
  • Proxestops, J. A. Gauthier 1982 [Anguidae]
  • Pseudacris, Fitzinger 1843 [Hylidae]
  • Pseudamphicyon, Schlosser 1887 [Amphicyonidae]
  • Pseudanisonchus, Zhang et al. 1979 [Periptychidae]
  • Pseudarctos, Schlosser 1899 [Amphicyonidae]
  • Pseudaxis, Gray 1872 [Cervidae]
  • Pseudeumeces, Hoffstetter 1944 [Lacertidae]
  • Pseudeutatus, F. Ameghino 1891 [Dasypodidae]
  • Pseudhapalops, F. Ameghino 1891 [Megatheriidae]
  • Pseudhesperosuchus, Bonaparte 1969 [Crocodylomorpha]
  • Pseudhyrax, F. Ameghino 1901 [Archaeohyracidae]
  • Pseudictopidae, family, A. Sulimski 1969 [Anagalida]
  • Pseudoanosteira [Carettochelyidae]
  • Pseudobos, Schlosser 1903 [Bovidae]
  • Pseudobranchus, Gray 1825 [Sirenidae]
  • Pseudocemophora, Auffenberg 1963 [Colubridae]
  • Pseudocivetta, G. Petter 1963 [Viverridae]
  • Pseudocyonopsis, Kuss 1965 [Amphicyonidae]
  • Pseudohegetotherium, Cabrera and Kraglievich 1931 [Hegetotheriidae]
  • Pseudolacerta, G. De Stefano 1903 [Cordylidae]
  • Pseudoprepotherium, Hoffstetter 1961 [Mylodontidae]
  • Pseudorhineura, Vanzolini 1951 [Rhineuridae]
  • Pseudorhyncocyon, Filhol 1892 [Pseudorhyncocyonidae]
  • Pseudorhyncocyonidae, family, B. Sigé 1974 [Leptictida]
  • Pseudostegotherium, F. Ameghino 1902 [Dasypodidae]
  • Pseudotragus, Schlosser 1904 [Bovidae]
  • Pseudotriton, Tschudi 1838 [Plethodontidae]
  • Pseudotypotherium, F. Ameghino 1904 [Mesotheriidae]
  • Psittaciformes, order, Wagler 1830 [Reptilia]
  • Psophiidae, family, Bonaparte 1831 [Gruiformes]
  • Pterocles, Temminck 1815 [Pteroclidae]
  • Pteroclidae, family, Bonaparte 1831 [Columbiformes]
  • Pterodactylidae, family, Bonaparte 1838 [Reptilia]
  • Pterodactyloidea, suborder, Plieninger 1901 [Reptilia]
  • Pterodactylus, Cuvier 1809 [Reptilia]
  • Pterodaustridae, family, J. F. Bonaparte 1971 [Reptilia]
  • Pterodaustro, Bonaparte 1970 [Reptilia]
  • Pterodroma, Bonaparte 1856 [Procellariidae]
  • Pteroplax, Hancock and Atthby 1868 [Eogyrinidae]
  • Pteropodidae, family, Gray 1821 [Chiroptera]
  • Pterosauria, order, Kaup 1834 [Reptilia]
  • Pterygoboa, J.A. Holman 1976 [Boidae]
  • Ptychadena, Boulenger 1917 [Ranidae]
  • Ptychogaster, Pomel 1847 [Emydidae]
  • Ptychoramphus, Brandt 1837 [Alcidae]
  • Puercosaurus, S. W. Williston 1916 [Sauropsida]
  • Puffinus, Brisson 1760 [Procellariidae]
  • Pultiphagonides, Hopwood 1934 [Bovidae]
  • Putterillia, Broom 1915 [Stereospondyli]
  • Pygoscelis, Wagler 1832 [Spheniscidae]
  • Pyramiodontherium, Rovereto 1914 [Megatheriidae]
  • Pyrotheria, suborder, F. Ameghino 1895 [Meridiungulata]
  • Pyrotheriidae, family, Ameghino 1889 [Pyrotheria]
  • Pyrotherium, F. Ameghino 1888 [Pyrotheridae]
  • Qianshanosaurus, Hou 1974 [Squamata]
  • Querandiornis, Rusconi 1958 [Tinamidae]
  • Quercygale, Kretzoi 1945 [Carnivoramorpha]
  • Quercylurus, L. Ginsburg 1979 [Felidae]
  • Quercyrallus, Lambrecht 1933 [Rallidae]
  • Quinkana, Molnar 1981 [Crocodylidae]
  • Quipollornis, Rich and McEvey 1977 [Aegothelidae]
  • Qurliqnoria, Bohlin 1937 [Bovidae]
  • Rabaticeras, Ennouchi 1953 [Bovidae]
  • Rabidosaurus, Kalandadze 1970 [Dicynodontidae]
  • Ralli, suborder [Gruiformes]
  • Rallicrex, Lambrecht 1933 [Rallidae]
  • Rallidae, family, Vigors 1825 [Ralliformes]
  • Rallus, C. Linnaeus 1758 [Rallidae]
  • Rana, Linnaeus 1758 [Ranidae]
  • Ranidae, family, Rafinesque 1814 [Salientia]
  • Raphenacodus, Gabunia 1971 [Artiodactyla]
  • Raphicerus, Smith 1827 [Bovidae]
  • Raphus, Brisson 1760 [Raphidae]
  • Rauisuchia, suborder, F. v. Huene 1942 [Pseudosuchia]
  • Rauisuchidae, family, F. v. Huene 1942 [Rauisuchidae]
  • Raulringueletia, Zett 1972 [Hegetotheriidae]
  • Recurvirostridae, family, Bonaparte 1854 [Charadriiformes]
  • Redunca, H. Smith 1827 [Bovidae]
  • Remiculus, D. E. Russell 1964 [Adapisoriculidae]
  • Remiornis, Lemoine 1881 [Remiornithidae]
  • Restes, J. A. Gauthier 1982 [Squamata]
  • Rhacophoridae, family, Hoffman 1932 [Salientia]
  • Rhacophorus, Kuhl and van Hasselt 1822 [Rhacophoridae]
  • Rhagatherium, Pictet 1857 [Choeropotamidae]
  • Rhamphorhynchidae, family, H. G. Seeley 1870 [Reptilia]
  • Rhamphorhynchoidea, suborder, Plieninger 1901 [Reptilia]
  • Rhamphorhynchus, Meyer 1847 [Rhamphorhynchidae]
  • Rhamphosuchus, Lydekker 1886 [Gavialidae]
  • Rhegminornis, Wetmore 1943 [Phasianidae]
  • Rheidae, family, Bonaparte 1849 [Struthioniformes]
  • Rheiformes, order [Struthioniformes]
  • Rhinatrematidae, family [Gymnophiona]
  • Rhineceps, Watson 1962 [Rhinesuchidae]
  • Rhinesuchoidea, superfamily [Temnospondyli]
  • Rhinesuchus, Broom 1908 [Rhinesuchidae]
  • Rhineura, Cope 1861 [Rhineuridae]
  • Rhinocerocephalus, Vjuschkov 1969 [Kannemeyeriidae]
  • Rhinocerolophiodon, K.-H. Fischer 1977 [Lophiodontidae]
  • Rhinodicynodon, Kalandadze 1970 [Dicynodontia]
  • Rhinolophidae, family, Gray 1825 [Chiroptera]
  • Rhinolophoidea, superfamily [Chiroptera]
  • Rhinophrynidae, family [Salientia]
  • Rhinophrynus, C. Dumeril and G. Bibron 1841 [Rhinophrynidae]
  • Rhinosauriscus, Kuhn 1963 [Seymouriidae]
  • Rhinotitan, Granger and Gregory 1943 [Brontotheriidae]
  • Rhizomyidae, family, Miller and Gidley 1918 [Spalacidae]
  • Rhodanogekko, Hoffstetter 1946 [Gekkonidae]
  • Rhodopagus, Radinsky 1965 [Hyracodontidae]
  • Rhombomylus, Zhai 1978 [Eurymylidae]
  • Rhopalodon, Fischer von Waldheim 1841 [Dinocephalia]
  • Rhynchaeites, E. Wittich 1898 [Threskiornithidae]
  • Rhynchonkos, Schulze and Foreman 1981 [Lepospondyli]
  • Rhynchosauridae, family, Huxley 1887 [Rhynchosauridae]
  • Rhynchosaurus, Owen 1842 [Rhynchosauridae]
  • Rhynchotragus, Neumann 1905 [Bovidae]
  • Rhynochetidae, family, Newton 1868 [Gruiformes]
  • Rhynotragus, Reck 1925 [Bovidae]
  • Rhyphodon, Roth 1899 [Isotemnidae]
  • Rhytidosteidae, family, Huene 1920 [Rhytidosteoidea]
  • Riacama, Ameghino 1899 [Cariamidae]
  • Ricnodon, Fritsch 1883 [Hapsidopareiontidae]
  • Riebeeckosaurus, Boonstra 1952 [Tapinocephalidae]
  • Ringueletia, Reig 1958 [Dasypodidae]
  • Robertia, Boonstra 1948 [Pylaecephalidae]
  • Robertiidae, family, Cluver and King 1983 [Diictodontia]
  • Rodentia, order, Bowditch 1821 [Glires]
  • Romainvillia, Lebedinsky 1927 [Anseriformes]
  • Ronzotherium, A. Aymard 1854 [Rhinocerotidae]
  • Rosasia, Costa 1940 [Bothremydidae]
  • Rostratulidae, family, Ridgway 1919 [Charadriiformes]
  • Roxochelys, Price 1953 [Pelomedusidae]
  • Rubidgea, Broom 1938 [Gorgonopsidae]
  • Rubidgina, Broom 1942 [Ictidorhinidae]
  • Ruminantia, suborder, Scopoli 1777 [Ruminantiamorpha]
  • Rusconiodon, J. F. Bonaparte 1970 [Traversodontidae]
  • Russellopheidae, family [Ophidia]
  • Ruticeros, Pilgrim 1939 [Bovidae]
  • Rutiodon, E. Emmons 1856 [Phytosauridae]
  • Sabadellictis, G. Petter 1963 [Mustelidae]
  • Saghatherium, Andrews and Beadnell 1902 [Pliohyracidae]
  • Sagittariidae, family, R. Grandori and L. Grandori 1935 [Falconiformes]
  • Sakya [Emydidae]
  • Salamandra, Laurenti 1768 [Urodela]
  • Salamandridae, family, J. E. Gray 1825 [Urodela]
  • Salamandrina, Fitzinger 1826 [Salamandridae]
  • Salamandroidea, suborder, Noble 1931 [Caudata]
  • Saltenia, Reig 1959 [Pipidae]
  • Saltoposuchidae, family [Crocodylomorpha]
  • Saltoposuchus, von Huene 1921 [Pedeticosauridae]
  • Salvadora, Baird and Girard 1853 [Colubridae]
  • Samokeros, Solounias 1981 [Bovidae]
  • Samotherium, Forsyth Major 1888 [Giraffidae]
  • Sanitherium, H. von Meyer 1866 [Sanitheriidae]
  • Saniwides, M. Borsuk-Bialynicka 1984 [Varanidae]
  • Sapheosaurus, H. von Meyer 1850 [Sphenodontidae]
  • Sarcocyon, L. Ginsburg 1966 [Amphicyonidae]
  • Sarcoramphus, Duméril 1806 [Cathartidae]
  • Sarmatosula, Grigorescu and Kessler 1977 [Sulidae]
  • Saturninia, Stehlin 1940 [Nyctitheriidae]
  • Sauravus, Thévenin 1906 [Scincosauridae]
  • Saurerpetontidae, family, Chase 1965 [Dvinosauria]
  • Saurillus, Owen 1855 [Paramacellodidae]
  • Sauroctonus, Bystrow 1955 [Gorgonopsidae]
  • Sauromalus, Duméril 1856 [Iguanidae]
  • Sauropodomorpha, suborder, F. v. Huene 1932 [Saurischia]
  • Saurornithoididae, family, R. Barsbold 1974 [Reptilia]
  • Saurosuchus, O. A. Reig 1959 [Loricata]
  • Saxonerpeton, Carroll and Gaskill 1978 [Lepospondyli]
  • Scaglia, G. G. Simpson 1957 [Astrapotheriidae]
  • Scalopolacerta, Mendrez and Carroll 1979 [Scaloposauridae]
  • Scaloposauridae, family, Broom 1914 [Theriodontia]
  • Scandentia, order, Wagner 1855 [Sundatheria]
  • Scaphiopus, Holbrook 1836 [Pelobatidae]
  • Scaphognathus, Wagner 1861 [Rhamphorhynchidae]
  • Scaphonyx, A. S. Woodward 1907 [Rhynchosauria]
  • Scaptochirus, Milne-Edwards 1867 [Talpidae]
  • Scaptogale, Trouessart 1898 [Talpidae]
  • Scaptonyx, Milne-Edwards 1872 [Talpidae]
  • Scarrittia, G.G. Simpson 1934 [Leontiniidae]
  • Scelidodon, F. Ameghino 1881 [Mylodontidae]
  • Scelidotherium, R. Owen 1839 [Mylodontidae]
  • Sceloporus, Wiegmann 1828 [Iguanidae]
  • Scharschengia, Huene 1940 [Sphenodontidae]
  • Schismotherium, F. Ameghino 1887 [Xenarthra]
  • Schizochoerus, M. Crusafont-Pairo and R. Lavocat 1954 [Suoidea]
  • Schlosseria, Matthew and Granger 1926 [Lophialetidae]
  • Schoenfelderpeton, Boy 1986 [Branchiosauridae]
  • Scincidae, family, Gray 1825 [Squamata]
  • Scincosauridae, family, Jaeckel 1909 [Nectridea]
  • Scincosaurus, Fric 1876 [Nectridea]
  • Sciuravidae, family, Miller and Gidley 1918 [Rodentia]
  • Sciurognathi, suborder, T. Tullberg 1899 [Rodentia]
  • Sciuroidea, superfamily [Rodentia]
  • Sciuromorpha, infraorder, Brandt 1855 [Rodentia]
  • Sclerocalyptus, F. Ameghino 1891 [Glyptodontidae]
  • Sclerocephalus, Goldfuss 1847 [Stereospondylomorpha]
  • Scleromochlidae, family, Huene 1914 [Avemetatarsalia]
  • Sclerosauridae, family, Nopsca 1923 [Procolophonoidea]
  • Sclerosaurus, von Meyer 1857 [Procolophonidae]
  • Scolecomorphidae, family [Gymnophiona]
  • Scolecophidia, infraorder, Duméril and Bibron 1844 [Ophidia]
  • Scoliomus, Williston and Case 1915 [Pelycosauria]
  • Scolopacidae, family, Vigors 1825 [Charadriiformes]
  • Scopidae, family [Ciconiiformes]
  • Scopus, Brisson 1760 [Scopidae]
  • Scraeva, P. E. Cray 1973 [Nyctitheriidae]
  • Scutemys, Wiman 1930 [Testudines]
  • Scylacognathus, Broom 1913 [Gorgonopsidae]
  • Scylacops, Broom 1913 [Gorgonopsidae]
  • Sebecidae, family, Simpson 1937 [Sebecosuchia]
  • Sebecus, Simpson 1937 [Sebecidae]
  • Selenarctos, P. M. Heude 1901 [Ursidae]
  • Selenolophodon, Chang and Zhai 1978 [Tapiridae]
  • Selenoportax, Pilgrim 1937 [Bovidae]
  • Seleviniidae, family, Bashanov and Belosludov 1939 [Rodentia]
  • Semigenetta, Helbing 1927 [Viverridae]
  • Seymouriamorpha, suborder, D. M. S. Watson 1917 [Batrachosauria]
  • Seymouriidae, family, Williston 1911 [Seymouriidae]
  • Shamosuchus, Mook 1924 [Neosuchia]
  • Shanshanosauridae, family, Z. Dong 1977 [Avetheropoda]
  • Sharamynodon, Kretozi 1942 [Amynodontidae]
  • Shastasauridae, family, J. C. Merriam 1902 [Merriamosauria]
  • Shelania, Casamiquela 1960 [Pipidae]
  • Shensispira, Chiu et al. 1979 [Bovidae]
  • Shuotherium, M. Chow and T. H. V. Rich 1982 [Shuotheriidae]
  • Shweboemys, Swinton 1939 [Testudines]
  • Sianodon, Xu 1965 [Amynodontidae]
  • Silphoictidoides, Huene 1950 [Ictidosuchidae]
  • Simamphicyon, Viret 1942 [Carnivoramorpha]
  • Simatherium, Dietrich 1941 [Bovidae]
  • Simila [Sphenodontidae]
  • Simimyidae, family, A.E. Wood 1980 [Rodentia]
  • Simoedosaurus, Gervais 1877 [Choristodera]
  • Simoliopheidae, family [Ophidia]
  • Simoliopheoidea, superfamily [Ophidia]
  • Simorhinella, Broom 1915 [Simorhinellidae]
  • Simorhinellidae, family, Mendrez 1975 [Theriodontia]
  • Simplaletes, T. Qi 1980 [Lophialetidae]
  • Simpsonotus, Pascual et al. 1979 [Henricosborniidae]
  • Sinanas, Yeh 1980 [Anatidae]
  • Sinemydidae, family, Yeh 1963 [Testudines]
  • Sinemys, Wiman 1930 [Sinemydidae]
  • Sinictis, Zdansky 1924 [Mustelidae]
  • Sinoconodontidae, family [Triconodonta]
  • Sinohadrianus, Ping 1929 [Testudinidae]
  • Sinohippus, R.-J. Zhai 1962 [Equidae]
  • Sinohyus, G.H.R. von Koenigswald 1963 [Suidae]
  • Sinoreas, Teilhard de Jardin and Trassaert 1938 [Bovidae]
  • Sinoryx, Teilhard de Jardin and Trassaert 1938 [Bovidae]
  • Sinosinopa, Qi 1987 [Micropternodontidae]
  • Sinotragus, Bohlin 1935 [Bovidae]
  • Siren, Linnaeus 1766 [Sirenidae]
  • Sirenidae, family, Gray 1825 [Urodela]
  • Sittidae, family, Lesson 1828 [Passeriformes]
  • Sivacapra, Pilgrim 1939 [Bovidae]
  • Sivaceros, Pilgrim 1937 [Bovidae]
  • Sivachoerus, Pilgrim 1926 [Suidae]
  • Sivacobus, Pilgrim 1939 [Bovidae]
  • Sivadenota, Pligrim 1939 [Bovidae]
  • Sivaelurus, Pilgrim 1913 [Felidae]
  • Sivafelis, Pilgrim 1932 [Felidae]
  • Sivahyus, Pilgrim 1926 [Suidae]
  • Sivalictis, Pilgrim 1932 [Mustelidae]
  • Sivanasua, G. E. Pilgrim 1931 [Procyonidae]
  • Sivaonyx, Pilgrim 1931 [Mustelidae]
  • Sivaportax, Pilgrim 1939 [Bovidae]
  • Sivasmilus, Kretzoi 1929 [Felidae]
  • Sivatherium, Falconer and Cautley 1836 [Giraffidae]
  • Sivatitanops, G. E. Pilgrim 1925 [Brontotheriidae]
  • Sivatragus, Pilgrim 1939 [Bovidae]
  • Sivoreas, G. E. Pilgrim 1939 [Bovidae]
  • Sivoryx, Pilgrim 1939 [Bovidae]
  • Siwalikosorex, Sahni and Khare 1976 [Soricidae]
  • Slaugenhopia, Olson 1962 [Trimerorhachidae]
  • Sokotochelys, Halstead 1979 [Reptilia]
  • Solenodonsauridae, family [Anthracosauria]
  • Solenodonsaurus, F. Broili 1924 [Batrachosauria]
  • Sonogrus, Kurochkin 1981 [Eogruidae]
  • Sordes, Sharov 1971 [Breviquartossa]
  • Soricella, U. Doben-Florin 1964 [Soricidae]
  • Soricidae, family, Fischer 1814 [Soricomorpha]
  • Soriculus, Blyth 1845 [Soricidae]
  • Spalacoidea, superfamily, Gray 1821 [Rodentia]
  • Sparassocynus, Mercerat 1898 [Didelphidae]
  • Sparodus, Fritsch 1876 [Gymnarthridae]
  • Spathicephalus, Watson 1928 [Loxommatoidea]
  • Sphaerodactylus, Wagler 1930 [Gekkonidae]
  • Sphenacodon, Marsh 1878 [Sphenacodontidae]
  • Sphenacodontidae, family, Marsh 1878 [Sphenacodontoidea]
  • Spheniscidae, family, Bonaparte 1831 [Sphenisciformes]
  • Spheniscus, Brisson 1760 [Spheniscidae]
  • Sphenodonta, order [Lepidosauria]
  • Sphenodontidae, family, E. D. Cope 1869 [Sphenodontia]
  • Sphenosuchia, suborder [Crocodylomorpha]
  • Sphenotherus, F. Ameghino 1891 [Mylodontidae]
  • Spirocerus, Boule and Teilhard de Jardin 1928 [Bovidae]
  • Spondylerpeton, Moodie 1912 [Archeriidae]
  • Spondylolestes, Broom 1937 [Procolophonidae]
  • Sporadotragus, Kretzoi 1968 [Bovidae]
  • Stagonolepis, Agassiz 1844 [Stagonolepididae]
  • Staurikosauria, order, G. S. Paul 1988 [Paleodinosauria]
  • Staurikosauridae, family, P. M. Galton 1977 [Herrerasauria]
  • Staurotypus, Wagler 1830 [Kinosternidae]
  • Steatornithidae, family, Bonaparte 1842 [Caprimulgiformes]
  • Stegodon, Falconer 1847 [Elephantidae]
  • Stegodontidae, family, Osborn 1918 [Proboscidea]
  • Stegolophodon, Pohlig 1888 [Stegodontidae]
  • Stegotetrabelodon, Petrocchi 1941 [Elephantidae]
  • Stegotheriopsis, Bordas 1939 [Dasypodidae]
  • Stegotherium, F. Ameghino 1887 [Dasypodidae]
  • Stellio, Laurenti 1768 [Agamidae]
  • Stenanagale, Wang 1975 [Anagalidae]
  • Stenaulorhynchus, S. H. Haughton 1932 [Rhynchosauridae]
  • Steneosaurus, G. Saint-Hilaire 1825 [Teleosauridae]
  • Stenonychosaurus, C. M. Sternberg 1932 [Troodontidae]
  • Stenoplesictis, Filhol 1880 [Carnivora]
  • Stenotatus, F. Ameghino 1891 [Dasypodidae]
  • Stephanocemas, Colbert 1936 [Lagomerycidae]
  • Stephanorhinus, Kretzoi 1942 [Rhinocerotidae]
  • Stephanospondylus, Stappenbeck 1905 [Diadectidae]
  • Stercorariidae, family, Brisson 1760 [Charadriiformes]
  • Stereogenys, Andrews 1901 [Testudines]
  • Stereognathus, Charlesworth 1854 [Tritylodontidae]
  • Stereorhachis, Gaudry 1880 [Eothyrididae]
  • Stereotoxodon, Ameghino 1904 [Toxodontidae]
  • Sternbergia, Paula Couto 1970 [Didelphidae]
  • Stilhippus, F. Ameghino 1904 [Notohippidae]
  • Stilosoma, Brown 1890 [Colubridae]
  • Stipanicicia, Reig 1956 [Mustelidae]
  • Stomatosuchidae, family, Stromer 1925 [Neosuchia]
  • Strepsiportax, Pilgrim 1937 [Bovidae]
  • Strigidae, family, Vigors 1825 [Strigiformes]
  • Strigiformes, order, Wagler 1830 [Reptilia]
  • Strogulognathus, Filhol 1890 [Bovidae]
  • Stromeriella, R. Dehm 1950 [Procyonidae]
  • Strongylokrotaphus, Novozhilov 1964 [Pliosauridae]
  • Struthiocephaloides, Boonstra 1952 [Tapinocephalidae]
  • Struthiocephalus, Haughton 1915 [Tapinocephalidae]
  • Struthionidae, family, Vigors 1825 [Struthioniformes]
  • Struthioniformes, order, Latham 1790 [Reptilia]
  • Struthionops, Boonstra 1952 [Tapinocephalidae]
  • Stygichelys [Baenidae]
  • Stylemys, J. Leidy 1851 [Testudinidae]
  • Stylinodontidae, family, O.C. Marsh 1875 [Taeniodonta]
  • Stylochoerus, van Hoepen and van Hoepen 1932 [Suidae]
  • Stylohipparion, van Hoepen 1932 [Equidae]
  • Styracocephalus, Haughton 1929 [Tapinocephalidae]
  • Suina, suborder, Gray 1868 [Suoidea]
  • Sulae, suborder, Reichenbach 1849 [Pelecaniformes]
  • Sulidae, family, Reichenbach 1849 [Pelecaniformes]
  • Suncus, Ehrenberg 1832 [Soricidae]
  • Suricata, Desmarest 1804 [Herpestidae]
  • Swainiguanoides, Sullivan 1982 [Iguanidae]
  • Sycosaurus, Haughton 1924 [Gorgonopsidae]
  • Sylviornis, F. Poplin 1980 [Megapodiidae]
  • Sylvisorex, Thomas 1904 [Soricidae]
  • Symmetrodonta, order, G.G. Simpson 1925 [Boreosphenida]
  • Symphysorrhachis, Belyaeva 1954 [Hyracodontidae]
  • Symplectocyon, Springhorn 1979 [Amphicyonidae]
  • Symptosuchus, Ameghino 1899 [Goniopholididae]
  • Synastrapotherium, Paula Couto 1976 [Astrapotheriidae]
  • Syncerus, Hodgson 1847 [Bovidae]
  • Synconolophus, Osborn 1929 [Gomphotheriidae]
  • Syndyodosuchus, Konzhukova 1956 [Intasuchidae]
  • Synostocephalus, Broili and Schroder 1935 [Pristerodontidae]
  • Syodon, Kutorga 1838 [Brithopodidae]
  • Syrrhopus, Boulenger 1888 [Leptodactylidae]
  • Syrtosmilus, L. Ginsburg 1978 [Barbourofelidae]
  • Tachyglossidae, family, Gill 1872 [Monotremata]
  • Tadorna, Boie 1822 [Anatidae]
  • Taeniodonta, order, E.D. Cope 1876 [Eutheria]
  • Talpidae, family (Fischer de Waldheim 1817) [Lipotyphla]
  • Tangasauridae, family, Haughton 1924 [Younginoidea]
  • Tanystropheidae, family, Gervais 1859 [Protorosauria]
  • Tanystropheus, von Meyer 1852 [Tanystropheidae]
  • Taphrosphys, E.D. Cope 1869 [Bothremydidae]
  • Tapinocephalia, infraorder [Dinocephalia]
  • Tapinocephalidae, family, R. Owen 1876 [Dinocephalia]
  • Tapiroidea, superfamily, Gill 1872 [Perissodactyla]
  • Tarentola, Gray 1825 [Gekkonidae]
  • Taricha, Gray 1850 [Salamandridae]
  • Tarsiidae, family, Gray 1825 [Primates]
  • Tarsiiformes, infraorder, W. K. Gregory 1915 [Primates]
  • Taucanamo, G.G. Simpson 1945 [Suoidea]
  • Taurosaurus [Tapinocephalidae]
  • Taxodon, Lartet 1851 [Mustelidae]
  • Tayassuidae, family, Palmer 1897 [Suoidea]
  • Teilhardia, W. D. Matthew and W. Granger 1926 [Perissodactyla]
  • Teinurosaurus, B. F. Nopcsa 1928 [Averostra]
  • Telecrex, A. Wetmore 1934 [Phasianidae]
  • Teleocrater, Charig 1956 [Thecodontia]
  • Teleolophus, Matthew and Granger 1925 [Tapiridae]
  • Teleosauridae, family, Geoffroy 1831 [Reptilia]
  • Telmasaurus, C. W. Gilmore 1943 [Varanidae]
  • Telmatodon, Pilgrim 1907 [Anthracotheriidae]
  • Temnoclemmys, Bergounioux 1957 [Emydidae]
  • Teratornis, L.H. Miller 1909 [Cathartidae]
  • Teratornithidae, family, L. H. Miller 1909 [Cathartidae]
  • Terrapene, Merrem 1820 [Emydidae]
  • Terrestrisuchus, Crush 1984 [Crocodylomorpha]
  • Tesselodon, Yan 1979 [Rhinocerotidae]
  • Testudinata, subclass (Oppel 1811) [Reptilia]
  • Testudinidae, family, J. E. Gray 1825 [Testudines]
  • Tetracerus, Leach 1825 [Bovidae]
  • Tetraconodon, Falconer 1868 [Suidae]
  • Tetracynodon, Broom and Robinson 1948 [Lycideopidae]
  • Tetragonias, Cruickshank 1967 [Kannemeyeriidae]
  • Teutomanis, Ameghino 1905 [Manidae]
  • Thadanius, Cifelli and Soria 1983 [Adianthidae]
  • Thalassemyidae, family, Rütimeyer 1878 [Testudines]
  • Thalassemys, Rütimeyer 1859 [Testudines]
  • Thalassictis, Nordmann 1850 [Hyaenidae]
  • Thalattosauridae, family, Merriam 1904 [Pelycosauria]
  • Thaleroceros, Reck 1935 [Bovidae]
  • Thaumastocyon, Stehlin and Helbing 1925 [Ursidae]
  • Thaumastognathus, Trouessart 1898 [Choeropotamidae]
  • Thecadactylus, Goldfuss 1820 [Gekkonidae]
  • Thecodontia, order, Owen 1859 [Archosauria]
  • Theosodon, Ameghino 1887 [Macraucheniidae]
  • Theridomyidae, family, Alston 1876 [Rodentia]
  • Theridomyoidea, superfamily, E. R. Alston 1876 [Rodentia]
  • Theriodictis, Mercerat 1891 [Canidae]
  • Theriognathus, Owen 1876 [Whaitsiidae]
  • Therioherpeton, Bonaparte and Barberena 1975 [Therioherpetidae]
  • Theriosuchus, R. C. Owen 1878 [Reptilia]
  • Thinocoridae, family [Charadriiformes]
  • Thoatherium, Ameghino 1887 [Proterotheriidae]
  • Thomashuxleya, F. Ameghino 1901 [Isotemnidae]
  • Thoosuchus, Efremov 1940 [Trematosauroidea]
  • Thoracosaurus, J. Leidy 1852 [Gavialoidea]
  • Thryonomyidae, family, Pocock 1922 [Rodentia]
  • Thryonomyoidea, superfamily, Pocock 1922 [Rodentia]
  • Thylamys, Gray 1843 [Didelphidae]
  • Thylatheridium, Reig 1952 [Didelphidae]
  • Thylophorops, Reig 1952 [Didelphidae]
  • Thyrohyrax, Meyer 1973 [Pliohyracidae]
  • Tienshanilophus, Tong 1978 [Phenacolophidae]
  • Tilemsisuchus, Buffetaut 1980 [Dyrosauridae]
  • Tillodontia, order, Marsh 1875 [Tillodontia]
  • Tinamidae, family, Gray 1840 [Tinamiformes]
  • Tinamiformes, order, Huxley 1872 [Reptilia]
  • Tinamus, Herrmann 1783 [Tinamidae]
  • Tinosaurus, O. C. Marsh 1872 [Agamidae]
  • Titanodectes, Granger and Gregory 1943 [Brontotheriidae]
  • Titanohyrax, Matsumoto 1922 [Pliohyracidae]
  • Titanoideidae, family, Patterson 1934 [Pantolambdoidea]
  • Titanophoneus, Efremov 1938 [Anteosauridae]
  • Titanornis, Mercerat 1893 [Phorusrhacidae]
  • Titanosuchia, infraorder [Dinocephalia]
  • Titanosuchidae, family, Broom 1903 [Titanosuchia]
  • Todidae, family, Vigors 1825 [Coraciiformes]
  • Tomistoma, Müller 1846 [Tomistominae]
  • Toribos [Bovidae]
  • Torticornis, Dmitrieva 1977 [Bovidae]
  • Tossunnoria, Bohlin 1937 [Bovidae]
  • Totanus, Moehring 1758 [Scolopacidae]
  • Toxochelyidae, family, Baur 1895 [Testudines]
  • Toxodon, R. Owen 1837 [Toxodontidae]
  • Toxodontia, suborder [Notoungulata]
  • Toxodontidae, family, R. Owen 1837 [Notoungulata]
  • Trachyaspis, H. von Meyer 1843 [Dermatemydidae]
  • Trachycalyptus, F. Ameghino 1908 [Glyptodontidae]
  • Trachydosaurus, Gray 1825 [Scincidae]
  • Trachystegos, Carroll 1966 [Pantylidae]
  • Trachytherus, F. Ameghino 1889 [Mesotheriidae]
  • Tragelaphus, de Blainville 1816 [Bovidae]
  • Tragocerus, Gaudry 1861 [Bovidae]
  • Tragoportax, Pilgrim 1937 [Bovidae]
  • Tragoreas, Schlosser 1908 [Bovidae]
  • Tragospira, Kretzoi 1954 [Bovidae]
  • Tragulidae, family, Milnes-Edwards 1864 [Ruminantia]
  • Tragulohyus, Gervais 1874 [Artiodactyla]
  • Traguloidea, infraorder [Ruminantia]
  • Transpithecus, F. Ameghino 1901 [Interatheriidae]
  • Traversodontidae, family, Huene 1936 [Gomphodontia]
  • Tregophis, J. A. Holman 1975 [Boidae]
  • Tremacyllus, Ameghino 1891 [Hegetotheriidae]
  • Trematops, Williston 1909 [Trematopidae]
  • Trematopsidae, family, Williston 1910 [Olsoniformes]
  • Trematosaurus, Burmeister 1849 [Trematosauridae]
  • Trematosuchus, Watson 1919 [Trematosauridae]
  • Triadobatrachus, Kuhn 1962 [Batrachia]
  • Trialestes, Bonaparte 1982 [Trialestidae]
  • Trialestia, suborder [Crocodylia]
  • Trialestidae, family, Bonaparte 1982 [Trialestia]
  • Triceromeryx, Villalta Commela et al. 1946 [Palaeomerycidae]
  • Trichasaurus, Williston 1913 [Pelycosauria]
  • Triconodon, Owen 1859 [Triconodontidae]
  • Triconodonta, order, H. F. Osborn 1888 [Eotheria]
  • Triconodontidae, family, O. C. Marsh 1887 [Eutriconodonta]
  • Tricuspes, E. von Huene 1933 [Mammalia]
  • Tricuspiodontidae, family, G.G. Simpson 1929 [Hyopsodontidae]
  • Trigodon, Ameghino 1882 [Toxodontidae]
  • Trigonostylopidae, family, Ameghino 1901 [Astrapotheria]
  • Trihecaton, Vaughn 1972 [Trihecatontidae]
  • Trihecatontidae, family, Vaughn 1972 [Tuditanomorpha]
  • Trilophosauria, order [Archosauromorpha]
  • Trilophosauridae, family, W. K. Gregory 1945 [Archosauromorpha]
  • Trimerorhachidae, family, Cope 1882 [Dvinosauria]
  • Trimerorhachis, Cope 1878 [Dvinosauria]
  • Trimerorhachoidea, superfamily [Rhachitomi]
  • Trimerostephanos, F. Ameghino 1895 [Isotemnidae]
  • Trionychidae, family, Gray 1825 [Testudines]
  • Trionychoidea, superfamily, Fitzinger 1826 [Testudines]
  • Trionyx, Forskal 1775 [Trionychidae]
  • Trirachodontidae, family, Crompton 1955 [Gomphodontia]
  • Trituberculata, infraclass [Metatheria]
  • Triturus, Rafinesque 1815 [Salamandridae]
  • Tritylodontidae, family, Cope 1884 [Cynodontia]
  • Trocharion, Forsyth Major 1903 [Mustelidae]
  • Trochictis, H. von Meyer 1842 [Mustelidae]
  • Trochili, suborder [Apodiformes]
  • Trochilidae, family, Vigors 1825 [Apodiformes]
  • Trochotherium, Fraas 1870 [Mustelidae]
  • Trogon, Moehring 1758 [Trogonidae]
  • Trogonidae, family, Lesson 1828 [Trogoniformes]
  • Tropidemys, Rütimeyer 1873 [Plesiochelyidae]
  • Tsaganomyidae, family, Matthew and Granger 1923 [Rodentia]
  • Tsaidamotherium, Bohlin 1935 [Bovidae]
  • Tsamnichoria, G.G. Simpson 1936 [Oldfieldthomasiidae]
  • Tseajaia, Vaughn 1964 [Tseajaiidae]
  • Tseajaiidae, family, Vaughn 1964 [Diadectomorpha]
  • Tubulidentata, order, Huxley 1872 [Tubulidentata]
  • Tuditanidae, family, E.D. Cope 1875 [Tuditanomorpha]
  • Tulerpeton, Lebedeu 1984 [Proterogyrinidae]
  • Tungurictis, Colbert 1939 [Hyaenidae]
  • Tupaiidae, family, Gray 1825 [Scandentia]
  • Tupinambis, Daudin 1802 [Teiidae]
  • Turnicidae, family, Gray 1840 [Charadriiformes]
  • Turnix, Bonnaterre 1791 [Turnicidae]
  • Tylototriton, Anderson 1871 [Salamandridae]
  • Typhlonectidae, family [Gymnophiona]
  • Typhlopidae, family, Bonaparte 1831 [Ophidia]
  • Typhlops, Oppel 1811 [Typhlopidae]
  • Typlothorax [Stagonolepididae]
  • Typothericulus, Kraglievich 1930 [Mesotheriidae]
  • Typotheriopsis, Cabrera and Kraglievich 1930 [Mesotheriidae]
  • Typotheroidea, suborder [Notoungulata]
  • Tyto, Billberg 1828 [Tytonidae]
  • Tytonidae, family, Ridgway 1914 [Strigiformes]
  • Ugandax, Cooke and Coryndon 1970 [Bovidae]
  • Uintatheriidae, family, Flower 1876 [Dinocerata]
  • Ulausuodon, Hu 1963 [Anthracotheriidae]
  • Ultrapithecus, F. Ameghino 1901 [Oldfieldthomasiidae]
  • Upupidae, family, Bonaparte 1831 [Coraciiformes]
  • Uralokannemeyeria, Danilov 1971 [Dicynodontidae]
  • Uranocentrodon, van Hoepen 1915 [Rhinesuchidae]
  • Urmiatherium, Rodler 1888 [Bovidae]
  • Urocordylidae, family, Lydekker 1889 [Nectridea]
  • Urocordylus, Huxley 1867 [Nectridea]
  • Uromastyx, Merrem 1820 [Agamidae]
  • Urosaurus, Hallowell 1854 [Iguanidae]
  • Urotherium, Castellanos 1926 [Glyptodontidae]
  • Urotrichus, Temminck 1841 [Talpidae]
  • Ursidae, family, Gray 1825 [Carnivora]
  • Ursulus, Kretzoi 1954 [Ursidae]
  • Urtinotherium, Chow and Chiu 1963 [Hyracodontidae]
  • Uruguaysuchidae, family, Gasparini 1971 [Notosuchia]
  • Uruguaysuchus, Rusconi 1933 [Uruguaysuchidae]
  • Urumgia, Zhang et al. 1984 [Discosauriscidae]
  • Uta, Baird and Girard 1852 [Iguanidae]
  • Utaetus, F. Ameghino 1902 [Dasypodidae]
  • Utatsusauridae, family, McGowan and Motani 2003 [Ichthyosauria]
  • Utegenia, Kusnetzov and Ivachnenko 1981 [Discosauriscidae]
  • Valenticarbo, Harrison 1979 [Phalacrocoracidae]
  • Varanidae, family, Hardwicke and Gray 1824 [Squamata]
  • Varanoidea, superfamily, J. E. Gray 1827 [Squamata]
  • Varanops, Watson 1914 [Varanopidae]
  • Varanus, Merrem 1820 [Varanidae]
  • Vassallia, Castellanos 1927 [Pampatheriidae]
  • Vectisaurus, J. W. Hulke 1879 [Iguanodontidae]
  • Venaticosuchus, Bonaparte 1970 [Reptilia]
  • Venjukovia, Amalitzky 1922 [Venyukovioidea]
  • Venjukoviamorpha, infraorder [Dicynodontia]
  • Venjukoviidae, family, Efremov 1940 [Venyukovioidea]
  • Veragromovia, Gabunia 1961 [Perissodactyla]
  • Vermilingua, superfamily [Xenarthra]
  • Vespertilionoidea, superfamily [Chiroptera]
  • Victorlemoineia, Ameghino 1901 [Macraucheniidae]
  • Vieraella, Reig 1961 [Salientia]
  • Vinayakia, Pilgrim 1932 [Felidae]
  • Viretailurus, Hemmer 1965 [Felidae]
  • Vishnucobus, Pilgrim 1939 [Bovidae]
  • Vishnucyon, Pilgrim 1932 [Amphicyonidae]
  • Vishnufelis, Pilgrim 1932 [Felidae]
  • Vishnuictis, Pilgrim 1932 [Viverridae]
  • Vishnuonyx, Pilgrim 1932 [Mustelidae]
  • Vishnutherium, Lydekker 1876 [Giraffidae]
  • Viverricula, Hodgson 1838 [Viverridae]
  • Vjushkovisaurus, Ochev 1982 [Rauisuchidae]
  • Volgasaurus, Kuzmin 1937 [Mastodonsauridae]
  • Volgasuchus, Efremov 1940 [Mastodonsauridae]
  • Vormela, Blasius 1884 [Mustelidae]
  • Vulturidae, family [Cathartidae]
  • Wanogale, Xu 1976 [Anagalidae]
  • Wawelia, Casamiquela 1963 [Salientia]
  • Weigeltisaurus, Kuhn 1939 [Coelurosauravus]
  • Wetlugasaurus, Riabinin 1930 [Capitosauria]
  • Whaitsiidae, family, Haughton 1918 [Theriodontia]
  • Wolterstorffiella, Herre 1950 [Dicamptodontidae]
  • Xantusia, Baird 1859 [Xantusiidae]
  • Xantusiidae, family, Baird 1858 [Squamata]
  • Xenastrapotherium, Kraglievich 1928 [Astrapotheriidae]
  • Xenibis [Plataleidae]
  • Xenictis, Kretzoi 1938 [Mustelidae]
  • Xenochoerus, Zdarsky 1909 [Sanitheriidae]
  • Xenohyus, L. Ginsburg 1980 [Suidae]
  • Xenopus, Wagler 1827 [Pipidae]
  • Xenosauridae, family, E. D. Cope 1866 [Squamata]
  • Xesmodon, Berg 1899 [Proterotheriidae]
  • Xestops, Cope 1873 [Anguidae]
  • Xiphodontidae, family, W. H. Flower 1883 [Xiphodontoidea]
  • Xotodon, F. Ameghino 1887 [Toxodontidae]
  • Yantanglestes, Ideker and Yan 1980 [Mesonychidae]
  • Yaxartemys, Riabinin 1948 [Testudines]
  • Youngornis, Yeh 1981 [Rallidae]
  • Zaedyus, F. Ameghino 1891 [Dasypodidae]
  • Zaglossus, Gill 1877 [Tachyglossidae]
  • Zaisanamynodon, Belajeva 1971 [Amynodontidae]
  • Zalambdodonta, suborder [Deltatheridia]
  • Zangerlia, M. Mlynarski 1972 [Nanhsiungchelyidae]
  • Zaphrissa, E. D. Cope 1866 [Discoglossidae]
  • Zapodidae, family, Coues 1875 [Rodentia]
  • Zarafa, Hamilton 1973 [Canthumerycidae]
  • Zarcasaurus [Araeoscelidae]
  • Zatracheidae, family, Williston 1910 [Rhachitomi]
  • Zatrachys, E.D. Cope 1878 [Zatracheidae]
  • Zeltornis, Balouet 1981 [Ardeidae]
  • Zhongjianoletes, Ye 1983 [Lophialetidae]
  • Zhongyuanus, Hou 1980 [Diatrymatidae]
  • Zorillodontops, Cluver 1969 [Scaloposauridae]
  • Zygodactylidae, family, Brodkorb 1971 [Reptilia]
  • Zygodactylus, Ballmann 1969 [Zygodactylidae]
  • Zygolestes, Ameghino 1898 [Didelphidae]
  • Zygosaurus, Eichwald 1848 [Dissorophidae]