Between brackets is the number of accepted species

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- Mollusca (132 738)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 984)
- Subclass Autobranchia (23 270)
- Infraclass Heteroconchia (16 634)
- Subterclass Archiheterodonta (1 205)
- Subterclass Euheterodonta (11 356)
- Superorder Anomalodesmata (987)
- Superorder Imparidentia (10 336)
- Order Adapedonta (260)
- Order Cardiida (3 055)
- Superfamily Anthracosioidea Amalitzky, 1892 † (215)
- Superfamily Cardiacea accepted as Cardioidea Lamarck, 1809
- Superfamily Cardioidea Lamarck, 1809 (1 536)
- Family Adacnidae Gill, 1871 accepted as Adacnini Gill, 1871
- Family Cardiidae Lamarck, 1809 (1 526)
- Family Chametracheidae H. Adams & A. Adams, 1857 accepted as Tridacninae Lamarck, 1819
- Family Clinocardiidae Kafanov, 1975 accepted as Clinocardiinae Kafanov, 1975
- Family Fragidae R. B. Stewart, 1930 accepted as Fraginae R. B. Stewart, 1930
- Family Goniocardiidae Scarlato & Starobogatov, 1979 † accepted as Tridacninae Lamarck, 1819
- Family Lymnocardiidae Stoliczka, 1870 accepted as Lymnocardiinae Stoliczka, 1870
- Family Pterocardiidae Scarlato & Starobogatov, 1979 † (10)
- Family Tridacnidae Lamarck, 1819 accepted as Tridacninae Lamarck, 1819
- Superfamily Tellinacea accepted as Tellinoidea Blainville, 1814
- Superfamily Tellinoidea Blainville, 1814 (1 304)
- Superfamily Tridacnoidea accepted as Tridacninae Lamarck, 1819
- 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 (6 636)
- 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 (1 830)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 673)
- 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