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Mollusca (132 848)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 011)
Class Caudofoveata (143)
Class Cephalopoda (1 834)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 752)
Subclass Amphigastropoda † (396)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 669)
Subclass Gastropoda incertae sedis (308)
Subclass Heterobranchia (39 172)
Subclass Neomphaliones accepted as Vetigastropoda
Subclass Neritimorpha (1 914)
Subclass Orthogastropoda represented as Gastropoda
Subclass Patellogastropoda (511)
Subclass Prosobranchia
Subclass Psilogastropoda represented as Gastropoda
Subclass Vetigastropoda (6 782)
Order Anisobranchia accepted as Trochidae Rafinesque, 1815
Order Cocculinida (69)
Order Lepetellida (1 205)
Order Neomphalida (63)
Order Pleurotomariida (695)
Superfamily Eotomarioidea Wenz, 1938 † accepted as Porcellioidea Zittel, 1895 †
Superfamily Murchisonioidea Koken, 1896 † (33)
Superfamily Pleurotomariacea Swainson, 1840 accepted as Pleurotomarioidea Swainson, 1840
Superfamily Pleurotomarioidea Swainson, 1840 (271)
Superfamily Porcellioidea Zittel, 1895 † (170)
Family Eotomariidae Wenz, 1938 † (103)
Subfamily Eotomariidae incertae sedis † (1)
Subfamily Eotomariinae Wenz, 1938 † (36)
Subfamily Neilsoniinae Knight, 1956 † (15)
Tribe Neilsoniini Knight, 1956 † (5)
Tribe Spirovallini Waterhouse, 2001 † (2)
Genus Barrealispira Taboada & Sabattini, 1987 † (1)
Genus Bicarinella Waterhouse, 1966 † (1)
Genus Carinella Waterhouse, 1963 † accepted as Bicarinella Waterhouse, 1966 †
Genus Lukesispira Frýda & Manda, 1997 † (1)
Genus Lunulazona Sadlick & M. F. Nielsen, 1963 † (2)
Genus Wellergyi Thein & Nitecki, 1974 † (1)
Genus Zosterospira X.-D. Qiao, 1983 † (2)
Species Zosterospira multilira X.-D. Qiao, 1983 †
Species Zosterospira spirolina X.-D. Qiao, 1983 †
Subfamily Ruedemanniinae Knight, 1956 † (2)
Genus Ambozone Batten, 1972 † (1)
Genus Amplitomaria Karapunar & Nützel, 2021 † (1)
Genus Angyomphalus Cossmann, 1916 † (2)
Genus Eoangyomphalus Blodgett & J. G. Johnson, 1992 † (3)
Genus Hammatospira M. Gordon & Yochelson, 1983 † (2)
Genus Kamupena Speden, 1962 † (1)
Genus Lacunospira Batten, 1958 † (2)
Genus Luciellina Kittl, 1900 † (2)
Genus Manzanospira Batten, 1989 † (3)
Genus Nodulispira H.-Z. Pan & A. G. Cook, 2003 † (2)
Genus Nordospira Yochelson, 1966 † (2)
Genus Peruvispira Chronic, 1949 † (12)
Genus Pseudoananias Karapunar & Nützel, 2021 † (1)
Genus Pseudobaylea Dickins, 1963 † (1)
Genus Ptychonema Perner, 1903 † (4)
Genus Quadricarina Blodgett & J. G. Johnson, 1992 † (2)
Genus Stenozone Batten, 1972 † (3)
Genus Tropidostropha Longstaff, 1912 † (2)
Genus Zhonghuaspira Pan & Erwin, 2002 † (1)
Genus Zhusilengospira H.-Z. Pan & A. G. Cook, 2003 † (2)
Family Gosseletinidae Wenz, 1938 † (40)
Family Luciellidae Knight, 1956 † (7)
Family Mourloniidae Yochelson & Dutro, 1960 † (2)
Family Phanerotrematidae Knight, 1956 † (1)
Family Porcelliidae Zittel, 1895 † (14)
Family Pseudoschizogoniidae Bandel, 2009 † (1)
Family Ptychomphalinidae Wenz, 1938 † (2)
Superfamily Pseudophoroidea S. A. Miller, 1889 † (23)
Superfamily Ptychomphaloidea Wenz, 1938 † (115)
Superfamily Schizogonioidea L. R. Cox, 1960 † (74)
Superfamily Sinuspiroidea Mazaev, 2011 † (9)
Superfamily Worthenielloidea Bandel, 2009 † accepted as Schizogonioidea L. R. Cox, 1960 †
Order Seguenziida (923)
Order Trochida (3 799)
Superfamily Fissurellacea accepted as Fissurelloidea J. Fleming, 1822
Superfamily Trochacea accepted as Trochoidea Rafinesque, 1815
Superfamily Turbinoidea Rafinesque, 1815 accepted as Trochoidea Rafinesque, 1815
Superfamily Vetigastropoda incertae sedis (28)
Class Lamellibranchiata accepted as Bivalvia
Class Loricata accepted as Polyplacophora
Class Mollusca incertae sedis † (372)
Class Monoplacophora (229)
Class Pelecypoda accepted as Bivalvia
Class Polyplacophora (1 377)
Class Polyplaxiphora accepted as Polyplacophora
Class Rostroconchia † (64)
Class Scaphopoda (752)
Class Solenoconchia accepted as Scaphopoda
Class Solenogastres (313)
Subclass Chaetodermomorpha accepted as Caudofoveata