Between brackets is the number of accepted species

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- Mollusca (133 306)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 080)
- Subclass Autobranchia (23 352)
- Infraclass Heteroconchia (16 676)
- Subterclass Archiheterodonta (1 212)
- Subterclass Euheterodonta (11 389)
- Superorder Anomalodesmata (990)
- Superorder Imparidentia (10 366)
- Order Adapedonta (263)
- Order Cardiida (3 057)
- Order Galeommatida (791)
- Order Gastrochaenida (43)
- Order Hiatellida represented as Adapedonta
- Order Hippuritida † (322)
- Order Lucinida (997)
- Superfamily Lucinacea accepted as Lucinoidea J. Fleming, 1828
- Superfamily Lucinoidea J. Fleming, 1828 (801)
- Family Codakiidae Iredale, 1937 accepted as Codakiinae Iredale, 1937
- Family Corbidae Stoliczka, 1870 accepted as Fimbriinae Nicol, 1950
- Family Fimbriidae Nicol, 1950 (1870) accepted as Fimbriinae Nicol, 1950 (1)
- Family Lucinidae J. Fleming, 1828 (792)
- Family Mactromyidae L. R. Cox, 1929 † accepted as Edmondiidae W. King, 1850 †
- Family Paracyclidae P. A. Johnston, 1993 † (8)
- Genus Paracyclas J. Hall, 1843 † (8)
- Superfamily Thyasiroidea Dall, 1900 (1895) (196)
- Order Megalodontida † (141)
- Order Modiomorphida † (95)
- Order Myacea accepted as Myida
- Order Myida (925)
- Order Sphaeriida (661)
- Order Venerida (2 825)
- Superfamily Cyamioidea G. O. Sars, 1878 (98)
- Superfamily Gaimardioidea Hedley, 1916 accepted as Cyamioidea G. O. Sars, 1878
- Superfamily Galeommatacea accepted as Galeommatoidea J. E. Gray, 1840
- Superfamily Grammysioidea S. A. Miller, 1877 † (102)
- Superfamily Kalenteroidea Marwick, 1953 † (46)
- Superfamily Mactracea accepted as Mactroidea Lamarck, 1809
- Order Anomalodesmacea accepted as Anomalodesmata
- Order Euheterodonta incertae sedis (27)
- Order Pholadomyida represented as Anomalodesmata
- Family Lipanellidae T. M. Sánchez, 2005 † (4)
- Family Rhaetidiidae Dominici & Danise, 2024 † (2)
- Subterclass Heterodonta
- Subterclass Palaeoheterodonta (4 074)
- Superorder Heteroconchia incertae sedis † (1)
- Infraclass Pteriomorphia (6 676)
- Subclass Bivalvia incertae sedis (7)
- Subclass Palaeotaxodonta accepted as Nuculida
- Subclass Paleoheterodonta accepted as Palaeoheterodonta
- Subclass Protobranchia (1 379)
- Infraclass Cryptodonta † (342)
- Class Caudofoveata (143)
- Class Cephalopoda (1 921)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 048)
- 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 (1 381)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (754)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata