Invalid subtaxa: Beekmanoceras Ulrich and Foerste 1936 [invalid subgroup], Lysechinus Gregory 1897 [nomen dubium], Lysechinus incongruens Gregory 1897 [nomen dubium]
Parent taxon: Mollusca according to P. Bouchet et al. 2005
Sister taxa: Acaenoplax, Acevina, Actinoconus, Aculopileus, Acutirostriconus, Aldanolina, Algomella, Anisomyaria, Aplacophora, Asperoconus, Aviculocephaloconus, Bagenoviella, Beroides, Bisulcus, Bivalvia, Calyptoptomatida, Cambroscutum, Caudofoveata, Centriconus, Cephalopoda, Codonoconus, Conchifera, Conchula, Corystos, Crestoconus, Cyrtostoma, Dingus, Diplacophora, Dysnoetopla, Ebianella, Eosoconus, Granoconus, Gutticonus, Hamatoconus, Helcionelloida, Hemithecellitina, Huangshandogoconus, Huangshandongoconus, Hubeinella, Hyolitha, Kaschkadakia, Katunioides, Kepinospira, Khairkhaniidae, Khairkhaniiformes, Kraikchania, Kuanchuanella, Ladamarekiidae, Laticonus, Liantuoconus, Ligyrokala, Mackenziella, Macroscenella, Maikhanellidae, Makarakia, Merismoconcha, Minymerisma, Nothamusium, Odontogriphus, Omalenlina, Orthoconus, Palaeacmaea, Paragastropoda, Parascenella, Patelliconidae, Peotoconus, Pichynella, Polytropis, Porcaconus, Proconus, Pseudomatthevia, Rostroconchia, Sargaella, Scamboscamna, Scaphopoda, Scenellopsis, Serialia, Shabaktiella, Sichuanospira, Sinuconus, Solandangella, Solenogastres, Songlingella, Spatuloconus, Stenothecella, Stenothecoida, Sulcocarina, Tentaculita, Tergomya, Trunctoconus, Tuberoconus, Xilingxiaconus, Xinnanospira, Yangtzemerisma
Subtaxa: Admetidae, Alaria, Altadema, Archaeobranchia, Auroraella, Bellerophontida, Bicuerda, Briardia, Bucardites, Bulimella, Bulimus, Chartrionella, Chippewaella, Chuchleconus, Cithna, Conotrochus, Cyclostoma, Dextrobranchia, Dicathais, Dicosmus, Diozoptyxis, Eogastropoda, Euthyneura, Globulitopa, Hecatastoma, Helicarionoidea, Helicites, Helicoidea, Helictes, Heterostropha, Holyneconcha, Hyalaea, Hypsogastropoda, Isaea, Iteria, Liris, Lovonemetrida, Luoguella, Luoguispira, Mahajangina, Microcochlis, Mitrularia, Neptuneidae, Neritaemorpha, Neritimorpha, Notodelphinula, Opisthobranchia, Opisthonematidae, Orthogastropoda, Oxychilus, Palaeoniso, Pectinibranchia, Peraubium, Phorus, Pileopsis, Planorboidea, Platyostomella, Plicatusidae, Polygyridae, Pragoserpulinidae, Prosobranchia, Pulmonata, Rhytidopilidae, Rotellina, Sorbeoconcha, Spiraxidae, Spirgvaleia, Streptoneura, Suprazonalia, Taeniodomus, Thatcheriidae, Tortifusus, Toxonema, Trepsipleura, Tripartella, Trochiletes, Trochotremaria, Zeminolia, Zlichovia
Ecology: epifaunal