Between brackets is the number of accepted species

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- Mollusca (132 754)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 992)
- Subclass Autobranchia (23 278)
- Infraclass Heteroconchia (16 634)
- Subterclass Archiheterodonta (1 205)
- Subterclass Euheterodonta (11 356)
- Superorder Anomalodesmata (987)
- Superorder Imparidentia (10 336)
- Order Adapedonta (260)
- Superfamily Edmondioidea W. King, 1850 † (17)
- Superfamily Hiatellacea accepted as Hiatelloidea J. E. Gray, 1824
- Superfamily Hiatelloidea J. E. Gray, 1824 (63)
- Superfamily Solenoidea Lamarck, 1809 (180)
- Family Cultellidae A. M. Davies, 1935 accepted as Pharidae H. Adams & A. Adams, 1856
- Family Pharidae H. Adams & A. Adams, 1856 (95)
- Subfamily Cultellinae A. M. Davies, 1935 (43)
- Subfamily Novaculininae Ghosh, 1920 accepted as Pharellinae Stoliczka, 1870
- Subfamily Pharellinae Stoliczka, 1870 (12)
- Subfamily Pharinae H. Adams & A. Adams, 1856 (9)
- Subfamily Siliquinae Bronn, 1862 (30)
- Genus Aulus Oken, 1835 accepted as Siliqua Megerle von Mühlfeld, 1811
- Genus Capistrocardia Tate, 1887 † (1)
- Genus Ceratisolen Forbes, 1848 accepted as Pharus J. E. Gray, 1840
- Genus Cultrensis Coen, 1933 accepted as Phaxas Leach, 1852
- Genus Elizia Gray, 1854 accepted as Orbicularia Deshayes, 1850
- Genus Ensatella Swainson, 1840 accepted as Ensis Schumacher, 1817
- Genus Leguminaria Schumacher, 1817 accepted as Siliqua Megerle von Mühlfeld, 1811
- Species Leguminaria costata Schumacher, 1817 accepted as Siliqua radiata (Linnaeus, 1758)
- Species Leguminaria moreana A. d'Orbigny, 1845 †
- Genus Machaera A. Gould, 1841 accepted as Siliqua (Neomachaera) M. Huber, 2010
- Genus Neosiliqua T. Habe, 1965 accepted as Siliqua (Neosiliqua) T. Habe, 1965
- Genus Pharus T. Brown, 1844 accepted as Pharus J. E. Gray, 1840
- Genus Phaxus [sic] accepted as Phaxas Leach, 1852
- Genus Solecurtoides Des Moulins, 1832 accepted as Siliqua Megerle von Mühlfeld, 1811
- Genus Subcultellus Ghosh, 1920 accepted as Phaxas Leach, 1852
- Family Solenidae Lamarck, 1809 (85)
- 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 (6 644)
- 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 (1 832)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 679)
- 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