Between brackets is the number of accepted species

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- Mollusca (132 944)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 036)
- Class Caudofoveata (143)
- Class Cephalopoda (1 845)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 812)
- Subclass Amphigastropoda † (408)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 703)
- Subclass Gastropoda incertae sedis (309)
- Subclass Heterobranchia (39 180)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 914)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (514)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 784)
- Order Anisobranchia accepted as Trochidae Rafinesque, 1815
- Order Cocculinida (69)
- Order Lepetellida (1 205)
- Order Neomphalida (63)
- Order Pleurotomariida (696)
- Superfamily Eotomarioidea Wenz, 1938 † accepted as Porcellioidea Zittel, 1895 †
- Superfamily Murchisonioidea Koken, 1896 † (34)
- 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)
- Family Phanerotrematidae Knight, 1956 † (1)
- Family Porcelliidae Zittel, 1895 † (14)
- Subfamily Agnesiinae Knight, 1956 † (11)
- Subfamily Porcelliinae Zittel, 1895 † (2)
- Genus Porcellia Léveillé, 1835 † (2)
- Subgenus Porcellia (Porcellia) Léveillé, 1835 † represented as Porcellia Léveillé, 1835 †
- Subgenus Porcellia (Tremanotus) J. Hall, 1865 † accepted as Tremanotus J. Hall, 1865 †
- Species Porcellia fischeri M. Hörnes, 1855 † accepted as Kokenella fischeri (M. Hörnes, 1855) †
- Species Porcellia lingshuiensis Y.-T. Pan, 1985 †
- Species Porcellia magninodosa Y.-T. Pan, 1985 †
- Species Porcellia paucituberculata Y.-T. Pan & Erwin, 2002 † accepted as Porcellia magninodosa Y.-T. Pan, 1985 †
- Species Porcellia shipingensis F. Guo, 1983 † accepted as Neimongolidiscus shipingensis (F. Guo, 1983) †
- Genus Faxetrochus Schnetler & Lozouet, 2012 † (1)
- 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 (3 800)
- 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