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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)
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)
Subfamily Cardiidae incertae sedis (18)
Subfamily Cardiinae Lamarck, 1809 (88)
Subfamily Cerastodermatinae F. Nordsieck, 1969 accepted as Cerastodermatini F. Nordsieck, 1969
Subfamily Clinocardiinae Kafanov, 1975 (17)
Subfamily Fraginae R. B. Stewart, 1930 (52)
Subfamily Goethemiinae M. Huber, 2010 accepted as Lymnocardiinae Stoliczka, 1870
Subfamily Hypaninae Starobogatov, 1970 accepted as Adacnini Gill, 1871
Subfamily Laevicardiinae Keen, 1951 (29)
Subfamily Lahilliinae H. J. Finlay & Marwick, 1937 † (11)
Subfamily Lymnocardiinae Stoliczka, 1870 (950)
Tribe Acanthocardiini Kafanov & Starobogatov, 1977 (32)
Tribe Acobaecardiini Paramonova, 1980 † (2)
Tribe Adacnini Gill, 1871 (153)
Tribe Arcicardiini Nevesskaja, 1986 † (32)
Tribe Avicardiini S. V. Popov, 1977 † (22)
Tribe Aviculocardiini Paramonova, 2001 † (5)
Tribe Cerastodermatini F. Nordsieck, 1969 (40)
Genus Bessia Kojumdgieva & Sapundgieva, 1981 † (2)
Genus Cerastoderma Poli, 1795 (32)
Genus Korobkoviella Merklin, 1974 † (2)
Genus Raricardium Paramonova, 1986 † (4)
Tribe Chokrakiini S. V. Popov, 2001 † (1)
Tribe Hyrcaniini Kafanov & Starobogatov, 1977 † accepted as Adacnini Gill, 1871
Tribe Limnopappini Schlickum, 1962 † (17)
Tribe Lymnocardiini Stoliczka, 1870 † (186)
Tribe Merklinicardiini S. V. Popov, 2001 † (3)
Tribe Obsoletiformini Paramonova, 2001 † (59)
Tribe Pachydacnini Andreescu, 1975 † (47)
Tribe Paradacnini Eberzin, 1965 † (26)
Tribe Parvicardiini Kafanov & Starobogatov, 1977 (42)
Tribe Phyllocardiini Nevesskaja, 1986 † (13)
Tribe Planacardiini Paramonova, 2001 † (4)
Tribe Plicatiformini Paramonova, 2001 † (7)
Tribe Pontalmyrini Taktakischvili, 1981 † (186)
Tribe Prosodacnini Keen, 1937 † (68)
Genus Brachiodacna Eberzin, 1965 †
Genus Chartadacna Chelidze, 1953 †
Genus Didacnomya Andrusov, 1923 † accepted as Pseudocatillus Andrusov, 1903 †
Genus Gilletella Marinescu, 1973 † (2)
Genus Goethemia Lambiotte, 1979 (2)
Genus Kolesnikovia Muskhelishvili, 1966 †
Genus Myocardia Vest, 1861 † accepted as Lymnocardium Stoliczka, 1870 †
Genus Papyrocardium Gabuniya, 1953 †
Genus Prophyllicardium Jekelius, 1944 †
Genus Uniocardium Capellini, 1880 † (1)
Subfamily Nemocardiinae ter Poorten, 2023 (107)
Subfamily Orthocardiinae J. A. Schneider, 2002 (67)
Subfamily Pleuriocardiinae J. A. Schneider, 1995 † (3)
Subfamily Profraginae Badve, 1977 † (6)
Subfamily Protocardiinae Bronn, 1849 † (37)
Subfamily Stylodacninae Papaianopol, 1987 † accepted as Prosodacnini Keen, 1937 †
Subfamily Trachycardiinae R. B. Stewart, 1930 (120)
Subfamily Tridacninae Lamarck, 1819 (19)
Tribe Clinocardiini Kafanov, 1975 accepted as Clinocardiinae Kafanov, 1975
Tribe Serripedini Kafanov, 1975 accepted as Clinocardiinae Kafanov, 1975
Genus Cerastes Poli, 1795 accepted as Cardium (Cerastoderma) Poli, 1795
Genus Divaricardium Dollfus & Dautzenberg, 1886 † (2)
Genus Fuscocardium Oyama, 1973 † accepted as Clinocardium Keen, 1936
Genus Trigonocardia [sic] accepted as Trigoniocardia Dall, 1900
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 (6 644)
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