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Mollusca (133 273)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 082)
Subclass Autobranchia (23 354)
Infraclass Heteroconchia (16 678)
Subterclass Archiheterodonta (1 212)
Subterclass Euheterodonta (11 391)
Superorder Anomalodesmata (990)
Superorder Imparidentia (10 368)
Order Adapedonta (263)
Order Cardiida (3 057)
Superfamily Anthracosioidea Amalitzky, 1892 † (215)
Superfamily Cardiacea accepted as Cardioidea Lamarck, 1809
Superfamily Cardioidea Lamarck, 1809 (1 536)
Superfamily Tellinacea accepted as Tellinoidea Blainville, 1814
Superfamily Tellinoidea Blainville, 1814 (1 306)
Family Amphidesmatidae Latreille, 1825 accepted as Semelidae Stoliczka, 1870 (1825)
Family Asaphidae Winckworth, 1932 accepted as Psammobiidae J. Fleming, 1828
Family Donacidae J. Fleming, 1828 (144)
Family Garidae Stoliczka, 1870 accepted as Psammobiidae J. Fleming, 1828
Family Icanotiidae R. Casey, 1961 † (7)
Family Lavignonidae Récluz, 1869 accepted as Semelidae Stoliczka, 1870 (1825)
Family Psammobiidae J. Fleming, 1828 (147)
Family Quenstedtiidae L. R. Cox, 1929 † (3)
Family Sanguinolariidae M. Smith, 1937 accepted as Psammobiidae J. Fleming, 1828
Family Scrobiculariidae H. Adams & A. Adams, 1856 accepted as Semelidae Stoliczka, 1870 (1825) (2)
Family Semelidae Stoliczka, 1870 (1825) (207)
Family Solecurtidae A. d'Orbigny, 1846 (54)
Family Sowerbyidae L. R. Cox, 1929 † (1)
Family Tancrediidae Meek, 1864 † (4)
Family Tellinidae Blainville, 1814 (737)
Family Unicardiopsidae Chavan, 1969 †
Genus Unicardiopsis Chavan, 1969 †
Subfamily Scrobiculariinae H. Adams & A. Adams, 1856 accepted as Semelidae Stoliczka, 1870 (1825)
Superfamily Tridacnoidea accepted as Tridacninae Lamarck, 1819
Order Galeommatida (791)
Order Gastrochaenida (43)
Order Hiatellida represented as Adapedonta
Order Hippuritida † (322)
Order Lucinida (997)
Order Megalodontida † (141)
Order Modiomorphida † (95)
Order Myacea accepted as Myida
Order Myida (925)
Order Sphaeriida (662)
Order Venerida (2 826)
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 (1 917)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (103 018)
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 (753)
Class Solenoconchia accepted as Scaphopoda
Class Solenogastres (313)
Subclass Chaetodermomorpha accepted as Caudofoveata