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Mollusca (132 848)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 011)
Subclass Autobranchia (23 297)
Infraclass Heteroconchia (16 637)
Subterclass Archiheterodonta (1 208)
Subterclass Euheterodonta (11 356)
Superorder Anomalodesmata (987)
Superorder Imparidentia (10 336)
Order Adapedonta (260)
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 Arcticoidea R. B. Newton, 1891 (1844) (67)
Superfamily Chamoidea Lamarck, 1809 (105)
Superfamily Corbiculoidea J. E. Gray, 1847 accepted as Cyrenoidea J. E. Gray, 1840
Superfamily Cyrenoidea J. E. Gray, 1840 (441)
Superfamily Cyrenoidoidea H. Adams & A. Adams, 1857 (1853) accepted as Cyrenoidea J. E. Gray, 1840
Superfamily Glossoidea J. E. Gray, 1847 (1840) (218)
Superfamily Hemidonacoidea Scarlato & Starobogatov, 1971 (7)
Superfamily Mactroidea Lamarck, 1809 (372)
Family Anatinellidae J. E. Gray, 1853 (12)
Family Cardiliidae P. Fischer, 1887 (10)
Family Mactridae Lamarck, 1809 (315)
Subfamily Darininae Signorelli, 2011 (3)
Subfamily Lutrariinae Gray, 1853 (44)
Subfamily Mactrinae Lamarck, 1809 (213)
Subfamily Resaniinae Marwick, 1931 (3)
Subfamily Tanysiphoninae Scarlato & Starobogatov, 1971 (1)
Subfamily Zenatiinae Dall, 1895 accepted as Lutrariinae Gray, 1853
Genus Aktschagylia Starobogatov, 1970 † (10)
Genus Aliomactra Stephenson, 1952 † (1)
Genus Andrussella Korobkov, 1954 † (2)
Genus Avimactra Andrusov, 1905 † (2)
Genus Caspimactra A. A. Ali-Zade & Kabakova, 1969 † (2)
Genus Chersonimactra Paramonova, 1978 † (3)
Genus Coleomactra [sic] accepted as Coelomactra Dall, 1895
Genus Colorimactra Iredale, 1929 accepted as Mactra Linnaeus, 1767
Genus Cryptodon Conrad, 1837 accepted as Tresus J. E. Gray, 1853
Genus Cryptomactra Andrussow, 1902 † (2)
Genus Cymbophora Gabb, 1869 † (3)
Genus Deikea Mayer-Eymar, 1872 accepted as Mactra Linnaeus, 1767
Genus Electomactra Iredale, 1930 accepted as Standella J. E. Gray, 1853
Genus Eopapyrina Woodring, 1982 † (1)
Genus Geltena Stephenson, 1946 † (1)
Genus Gnathodon G. B. Sowerby I, 1832 accepted as Rangia Desmoulins, 1832
Species Gnathodon cantrainei G. B. Sowerby II, 1873 accepted as Mulinia cleryana (A. d'Orbigny, 1846)
Species Gnathodon cuneatus G. B. Sowerby I, 1832 accepted as Rangia cuneata (G. B. Sowerby I, 1832)
Species Gnathodon flexuosa Conrad, 1839 accepted as Rangia flexuosa (Conrad, 1839)
Variety Gnathodon flexuosa var. petitianus Dall, 1894 accepted as Rangia flexuosa (Conrad, 1839)
Species Gnathodon johnsoni Dall, 1892 † accepted as Rangia (Miorangia) johnsoni (Dall, 1892) †
Species Gnathodon lecontei Conrad, 1853 † accepted as Rangia lecontei (Conrad, 1853) †
Species Gnathodon nasutus Dall, 1884 accepted as Rangia cuneata (G. B. Sowerby I, 1832)
Species Gnathodon parvum Petit de la Saussaye, 1853 accepted as Spisula trigonella (Lamarck, 1818)
Species Gnathodon rostratum Petit de la Saussaye, 1853 accepted as Rangia flexuosa (Conrad, 1839)
Species Gnathodon trigonum Petit de la Saussaye, 1853 accepted as Rangia mendica (A. Gould, 1851)
Species Gnathodon truncatum Petit de la Saussaye, 1853 accepted as Rangia mendica (A. Gould, 1851)
Species Gnathodon valdensis Dunker, 1846 † accepted as Neomiodon mactroides (F. A. Roemer, 1836) †
Genus Hemimactra Swainson, 1840 accepted as Spisula (Hemimactra) Swainson, 1840
Genus Heteromactra Cossmann, 1909 † accepted as Allomactra Tomlin, 1931 †
Genus Ionesimactra Signorelli, 2023 † (1)
Genus Kirghizella Andrusov, 1902 † (3)
Genus Laminaria Mayer, 1867 accepted as Resania J. E. Gray, 1853
Genus Leptomactra Ward, 1992 †
Genus Longimactra H. J. Finlay, 1928 accepted as Oxyperas Mörch, 1853
Genus Mactrodesma Conrad, 1869 † (1)
Genus Mactrona Marwick, 1952
Genus Mactrula Marwick, 1948 accepted as Pseudocardium Gabb, 1866 †
Genus Merope H. Adams & A. Adams, 1856 accepted as Meropesta Iredale, 1929
Genus Micromactra Dall, 1894 accepted as Mactrotoma Dall, 1894
Genus Mulinoides Olsson, 1944 † (1)
Genus Myomactra Mayer, 1867 accepted as Resania J. E. Gray, 1853
Genus Nannomactra Iredale, 1930 accepted as Mactra (Nannomactra) Iredale, 1930
Genus Nelltia Stephenson, 1952 † (1)
Genus Notospisula Iredale, 1930 accepted as Spisula J. E. Gray, 1837
Genus Nymphactra Stilwell & Zinsmeister, 1992 † (1)
Genus Ovamactra Woodring, 1982 † (1)
Genus Petromactra Saul, 1973 (1)
Genus Planimactra Ionesi, 1986 † (1)
Genus Podolimactra Ionesi, 1986 † (1)
Genus Praerangia Cossmann, 1908 † (1)
Genus Priscomactra Stephenson, 1952 † (1)
Genus Psammophila T. Brown, 1827 accepted as Lutraria (Psammophila) T. Brown, 1827
Genus Pseudomactra Steklov, 1960 † (1)
Genus Pseudoxyperas Sacco, 1901 accepted as Oxyperas Mörch, 1853
Genus Pteroluter Saul, 1973 † (1)
Genus Rangianella Conrad, 1868 accepted as Rangia (Rangianella) Conrad, 1868
Genus Schizodesma of Gray, 1838 accepted as Scissodesma Gray, 1837
Genus Schizothaerus Conrad, 1853 accepted as Tresus J. E. Gray, 1853
Genus Spisulina P. Fischer, 1887 accepted as Spisula J. E. Gray, 1837
Genus Spisulona Marwick, 1948 † accepted as Spisula (Spisulona) Marwick, 1948
Genus Standella Gray, 1853 sensu H. Adams & A. Adams, 1856 accepted as Leptospisula Dall, 1895
Genus Stereomactra Stewart, 1930 † (1)
Genus Stiphromactra Böhm, 1929 † (1)
Genus Symmorphomactra Dall, 1894 accepted as Simomactra Dall, 1894
Genus Telemactra Iredale, 1929 accepted as Mactra Linnaeus, 1767
Genus Tenuimactra Garvie, 1996 † (1)
Genus Trigonella da Costa, 1778 accepted as Mactra Linnaeus, 1767
Genus Vanganella J. E. Gray, 1853 accepted as Resania J. E. Gray, 1853
Genus Willimactra Saul, 1973 † (1)
Genus Zenatiopsis Tate, 1880 † (4)
Genus Zenatraria Beu, 1966 accepted as Lutraria (Psammophila) T. Brown, 1827
Family Mesodesmatidae J. E. Gray, 1840 (35)
Family Rangiidae P. Fischer, 1884 accepted as Mactridae Lamarck, 1809
Superfamily Opokielloidea Kanev, 1983 † (10)
Superfamily Palaeanodontoidea Modell, 1964 † accepted as Palaeomuteloidea Lahusen, 1897 †
Superfamily Prilukielloidea Starobogatov, 1970 † (59)
Superfamily Ungulinoidea J. E. Gray, 1854 (159)
Superfamily Veneracea accepted as Veneroidea Rafinesque, 1815
Superfamily Veneroidea Rafinesque, 1815 (1 383)
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 (102 752)
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