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)
- Family Luciellidae Knight, 1956 † (7)
- Family Mourloniidae Yochelson & Dutro, 1960 † (2)
- Tribe Mourlonides Yochelson & Dutro, 1960 † accepted as Mourloniidae Yochelson & Dutro, 1960 †
- Genus Mourlonia de Koninck, 1883 †
- Genus Rhineoderma de Koninck, 1883 † (2)
- Species Rhineoderma dinglensis (Girty, 1927) †
- Species Rhineoderma radula de Koninck, 1883 †
- 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