Between brackets is the number of accepted species

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- Mollusca (132 851)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 013)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 753)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 670)
- 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)
- Family Gosseletinidae Wenz, 1938 † (40)
- Subfamily Coelozoninae Knight, 1956 † (8)
- Subfamily Euryzoninae P. J. Wagner, 2002 † accepted as Coelozoninae Knight, 1956 †
- Subfamily Gosseletininae Wenz, 1938 † (21)
- Genus Globodoma Mazaev, 2006 † (2)
- Genus Gosseletia de Koninck, 1883 † accepted as Gosseletina P. Fischer, 1885 †
- Genus Gosseletina P. Fischer, 1885 † (3)
- Genus Nemaspira Mazaev, 2021 † (13)
- Species Nemaspira aspeniana (Girty, 1927) †
- Species Nemaspira fasciolata (Münster, 1841) †
- Species Nemaspira globosa (de Koninck, 1883) †
- Species Nemaspira johnsoni (Thein & Nitecki, 1974) †
- Species Nemaspira magna (Mazaev, 2019) †
- Species Nemaspira microstriata (Ketwetsuriya, Karapunar, Charoentitirat & Nützel, 2020) †
- Species Nemaspira obesa (Pan, 1977) †
- Species Nemaspira permiana (Batten, 1989) †
- Species Nemaspira shamaevi Mazaev, 2021 †
- Species Nemaspira skuini Mazaev, 2021 †
- Species Nemaspira spironema (Meek & Worthen, 1866) †
- Species Nemaspira subglobosa (J. Hall, 1877) †
- Species Nemaspira tornacensis (de Koninck, 1883) †
- Genus Pseudocryptaenia Koken, 1925 † (2)
- Genus Umbostropis [sic] † accepted as Umbotropis Perner, 1903 †
- Genus Umbotropis Perner, 1903 † (1)
- Subfamily Liospirinae Knight, 1956 † (5)
- Subfamily Triangulariinae Vostokova, 1960 †
- Genus Breizospira Blodgett, Fryda & Racheboeuf, 1999 † (1)
- Genus Liraloron Peel, 2016 † (1)
- Genus Nodospira Yochelson & Dutro, 1960 † (2)
- Genus Pressulasphaera Karapunar & Nützel, 2021 † (1)
- Genus Spiroraphella Grabau, 1936 †
- Genus Stenoloron Oehlert, 1888 † (1)
- 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