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)
- Subclass Autobranchia (23 299)
- Infraclass Heteroconchia (16 639)
- Subterclass Archiheterodonta (1 208)
- Subterclass Euheterodonta (11 358)
- Superorder Anomalodesmata (987)
- Superorder Imparidentia (10 338)
- Order Adapedonta (262)
- Superfamily Edmondioidea W. King, 1850 † (17)
- Family Edmondiidae W. King, 1850 † (16)
- Genus Allorisma W. King, 1844 † (2)
- Genus Cardimorpha [sic] † accepted as Cardiomorpha de Koninck, 1841 †
- Genus Cardiomorpha de Koninck, 1841 † (2)
- Species Cardiomorpha blatchfordi Hosking, 1931 †
- Species Cardiomorpha gymnitum Kittl, 1904 †
- Species Cardiomorpha obliquata Meek, 1872 †
- Species Cardiomorpha oblonga (J. De C. Sowerby, 1825) †
- Species Cardiomorpha ovata J. Hall, 1858 †
- Species Cardiomorpha puzosiana de Koninck, 1842 † accepted as Pseudedmondia puzosiana (de Koninck, 1842) †
- Species Cardiomorpha radiata Meek & Worthen, 1861 † accepted as Cardiopsis radiata (Meek & Worthen, 1861) †
- Species Cardiomorpha rhomboidea J. Hall, 1858 †
- Species Cardiomorpha rotunda J. Hall, 1883 † accepted as Eoschizodus chemungensis (Conrad, 1842) †
- Species Cardiomorpha tulongensis Z.-M. Zhang, 1976 †
- Genus Clisocolus Gabb, 1869 † (1)
- Genus Edmondia de Koninck, 1841 † (6)
- Genus Edmondiella B. I. Chernyshev, 1948 † accepted as Allorisma W. King, 1844 †
- Genus Isoculia McCoy, 1844 †
- Genus Mactromya Agassiz, 1843 † (1)
- Genus Notomya McCoy, 1847 †
- Genus Pseudedmondia P. Fischer, 1887 † (4)
- Family Pachydomidae P. Fischer, 1887 † (1)
- Superfamily Hiatellacea accepted as Hiatelloidea J. E. Gray, 1824
- Superfamily Hiatelloidea J. E. Gray, 1824 (63)
- Superfamily Solenoidea Lamarck, 1809 (182)
- Order Cardiida (3 055)
- Order Galeommatida (791)
- Order Gastrochaenida (43)
- Order Hiatellida represented as Adapedonta
- Order Hippuritida † (321)
- 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 (102 753)
- 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