Between brackets is the number of accepted species

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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)
- Subclass Autobranchia (23 297)
- Infraclass Heteroconchia (16 637)
- Subterclass Archiheterodonta (1 208)
- Subterclass Euheterodonta (11 356)
- Superorder Anomalodesmata (987)
- Superorder Imparidentia (10 336)
- Order Adapedonta (260)
- Order Cardiida (3 055)
- Order Galeommatida (791)
- Order Gastrochaenida (43)
- Order Hiatellida represented as Adapedonta
- Order Hippuritida † (321)
- Suborder Hippuritidina † (254)
- Superfamily Caprinoidea A. d'Orbigny, 1847 † (51)
- Superfamily Hippuritacea accepted as Radiolitoidea A. d'Orbigny, 1847 †
- Superfamily Radiolitoidea A. d'Orbigny, 1847 † (195)
- Family Caprinulidae Yanin, 1990 † (6)
- Family Caprotinidae J. E. Gray, 1848 † (13)
- Family Diceratidae Dall, 1895 † (28)
- Family Hippuritidae Gray, 1848 † (17)
- Family Monopleuridae Munier-Chalmas, 1873 † (32)
- Family Plagioptychidae Douvillé, 1888 † (17)
- Family Polyconitidae MacGillavry, 1937 † (6)
- Family Radiolitidae A. d'Orbigny, 1847 † (73)
- Family Trechmannellidae L. R. Cox, 1934 † (3)
- Genus Anodontopleura Felix, 1891 † (1)
- Genus Baryconites R. H. Palmer, 1928 † (1)
- Genus Cryptaulia Počta, 1889 † (3)
- Genus Dessia Pamouktchiev, 1983 † (1)
- Genus Lithocalamus Lupher & E. L. Packard, 1929 † (1)
- Genus Palus R. H. Palmer, 1928 † (1)
- Genus Rousselia Douvillé, 1898 †
- Genus Sabinia Parona, 1908 †
- Genus Somalites Pamouktchiev, 1983 †
- Suborder Requieniidina † (67)
- Order Lucinida (997)
- Order Megalodontida † (141)
- Order Modiomorphida † (94)
- Order Myacea accepted as Myida
- Order Myida (924)
- Order Sphaeriida (662)
- Order Venerida (2 821)
- 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 † (90)
- Superfamily Kalenteroidea Marwick, 1953 † (39)
- 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 (4 072)
- Superorder Heteroconchia incertae sedis † (1)
- Infraclass Pteriomorphia (6 660)
- Subclass Bivalvia incertae sedis (7)
- Subclass Palaeotaxodonta accepted as Nuculida
- Subclass Paleoheterodonta accepted as Palaeoheterodonta
- Subclass Protobranchia (1 365)
- Infraclass Cryptodonta † (342)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 752)
- 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