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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)
Infraclass Pteriomorphia (6 644)
Superorder Eupteriomorphia
Order Arcida (1 225)
Order Colpomyida † (6)
Order Cyrtodontida † (66)
Order Limida (351)
Order Myalinida † (576)
Order Mytilida (707)
Order Ostreida (705)
Superfamily Ostreacea accepted as Ostreoidea Rafinesque, 1815
Superfamily Ostreoidea Rafinesque, 1815 (243)
Superfamily Pinnacea accepted as Pinnoidea Leach, 1819
Superfamily Pinnoidea Leach, 1819 (138)
Superfamily Pteriacea accepted as Pterioidea Gray, 1847 (1820)
Superfamily Pterioidea Gray, 1847 (1820) (228)
Family Anningellidae Hodges, 2022 †
Family Aviculidae Goldfuss, 1820 accepted as Pteriidae J. E. Gray, 1847 (1820)
Family Bakevelliidae W. King, 1850 † (36)
Family Cassianellidae Ichikawa, 1958 † (8)
Family Isognomonidae Woodring, 1925 (1828) (37)
Genus Bathyisognomon Hickman, 2023 † (1)
Genus Edentula L. Waagen, 1907 † accepted as Waagenoperna Tokuyama, 1959 †
Genus Hippochaeta Philippi, 1844 † accepted as Isognomon (Hippochaeta) Philippi, 1844 †
Genus Isognomon [Lightfoot], 1786 (31)
Subgenus Isognomon (Anisoperna) Iredale, 1939 accepted as Isognomon [Lightfoot], 1786
Subgenus Isognomon (Hippochaeta) Philippi, 1844 † represented as Isognomon [Lightfoot], 1786
Subgenus Isognomon (Isognomon) [Lightfoot], 1786 represented as Isognomon [Lightfoot], 1786
Subgenus Isognomon (Melina) Philipsson, 1788 accepted as Isognomon [Lightfoot], 1786
Subgenus Isognomon (Parviperna) Iredale, 1939 represented as Isognomon [Lightfoot], 1786
Species Isognomon acutirostris (Dunker, 1869) accepted as Isognomon nucleus (Lamarck, 1819)
Species Isognomon acutirostris Otuka, 1936 accepted as Isognomon nucleus (Lamarck, 1819)
Species Isognomon alatus (Gmelin, 1791)
Species Isognomon albisoror (Iredale, 1939)
Species Isognomon anomioides (Reeve, 1858) accepted as Isognomon australicus (Reeve, 1858)
Species Isognomon attenuata (Reeve, 1858) accepted as Isognomon isognomum (Linnaeus, 1758)
Species Isognomon australica (Reeve, 1858) accepted as Isognomon australicus (Reeve, 1858)
Species Isognomon australicus (Reeve, 1858)
Species Isognomon aviculare (Lamarck, 1819) accepted as Isognomon isognomum (Linnaeus, 1758)
Species Isognomon bazini (Deshayes, 1858) †
Species Isognomon bicolor (C. B. Adams, 1845)
Species Isognomon brevirostre Link, 1807 accepted as Isognomon isognomum (Linnaeus, 1758)
Species Isognomon californicum (Conrad, 1837) accepted as Isognomon californicus (Conrad, 1837)
Species Isognomon californicus (Conrad, 1837)
Species Isognomon ciscaucasica (Davitashvili, 1932) † accepted as Isognomon radiatus (M. Hörnes, 1867) †
Species Isognomon dentifer (Krauss, 1848) accepted as Isognomon nucleus (Lamarck, 1819)
Species Isognomon dunkeri (P. Fischer, 1881)
Species Isognomon ephippium (Linnaeus, 1758)
Species Isognomon fortissimus (L. C. King, 1933) †
Species Isognomon gaudichaudi (A. d'Orbigny, 1843) †
Species Isognomon incavatus (Cossmann, 1905) †
Species Isognomon incisus (Conrad, 1837)
Species Isognomon isognomon (Linnaeus, 1758) accepted as Isognomon isognomum (Linnaeus, 1758)
Species Isognomon isognomum (Linnaeus, 1758)
Species Isognomon janus P. P. Carpenter, 1857
Species Isognomon lamarckii (Deshayes, 1830) †
Species Isognomon legumen (Gmelin, 1791)
Species Isognomon lilingensis R.-J. Zhang, 1977 †
Species Isognomon lusitanicus (Sharpe, 1850) †
Species Isognomon maxillatus (Lamarck, 1801) †
Species Isognomon nucleus (Lamarck, 1819)
Species Isognomon oneroaensis A. W. B. Powell & Bartrum, 1929 † accepted as Pteria oneroaensis (A. W. B. Powell & Bartrum, 1929) †
Species Isognomon percrassa (Tate, 1899) †
Species Isognomon perna (Linnaeus, 1767)
Species Isognomon radiatus (Anton, 1838)
Species Isognomon radiatus (M. Hörnes, 1867) †
Species Isognomon recognitus (Mabille, 1895)
Species Isognomon rekohuensis J. S. Crampton, 1988 †
Species Isognomon ricordeanus (A. d'Orbigny, 1846) †
Species Isognomon roberti H. J. Koch, 1953 accepted as Isognomon perna (Linnaeus, 1767)
Species Isognomon rollei (M. Hörnes, 1867) †
Species Isognomon rude (Reeve, 1858) accepted as Isognomon isognomum (Linnaeus, 1758)
Species Isognomon rugosus (Münster, 1835) †
Species Isognomon rupella (Dufo, 1840) accepted as Isognomon nucleus (Lamarck, 1819)
Species Isognomon staadti (Cossmann, 1907) †
Species Isognomon sulcatum (Lamarck, 1819) accepted as Isognomon perna (Linnaeus, 1767)
Species Isognomon varnensis (Toula, 1892) †
Species Isognomon vulsella (Lamarck, 1819) accepted as Isognomon legumen (Gmelin, 1791)
Species Isognomon vulselloides Macsotay & Campos, 2001
Species Isognomon wellmani J. S. Crampton, 1988 †
Genus Tambanella Nakazawa & Newell, 1968 † (2)
Genus Waagenoperna Tokuyama, 1959 † (3)
Family Kochiidae Frech, 1891 † (1)
Family Malleidae Lamarck, 1818 (14)
Family Margaritidae Blainville, 1824 (21)
Family Melinidae Meek & Hayden, 1865 accepted as Isognomonidae Woodring, 1925 (1828)
Family Pedalionidae Stephenson, 1923 accepted as Pteriidae J. E. Gray, 1847 (1820)
Family Pergamidiidae L. R. Cox, 1964 † (3)
Family Pernidae J. Fleming, 1828 accepted as Isognomonidae Woodring, 1925 (1828)
Family Plicatostylidae Lupher & E. L. Packard, 1929 † (6)
Family Pteriidae J. E. Gray, 1847 (1820) (60)
Family Pulvinitidae Stephenson, 1941 (6)
Family Reniellidae Iredale, 1939 accepted as Pteriidae J. E. Gray, 1847 (1820)
Family Vlastidae Neumayr, 1891 † (2)
Family Vulsellidae J. E. Gray, 1854 (34)
Superfamily Rhombopterioidea Korobkov, 1960 † (3)
Family Pterineidae Meek, 1864 † (93)
Order Pectinida (2 998)
Order Pteriida accepted as Ostreida
Order Pteriomorphia incertae sedis † (1)
Superfamily Yunannioidea R.-J. Zhang & Z.-J. Niu, 2021 † (2)
Family Ischyrodontidae Scarlato & Starobogatov, 1979 † (2)
Family Matheriidae Scarlato & Starobogatov, 1979 † (1)
Family Myodakryotidae Tunnicliff, 1987 † (4)
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