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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)
Order Laternulacea accepted as Thracioidea Stoliczka, 1870 (1839)
Suborder Laternulina accepted as Thracioidea Stoliczka, 1870 (1839)
Suborder Septibranchia
Superfamily Anomalodesmata incertae sedis (4)
Superfamily Clavagelloidea A. d'Orbigny, 1844 (34)
Superfamily Cuspidarioidea Dall, 1886 (335)
Superfamily Myochamoidea P. P. Carpenter, 1861 (55)
Superfamily Pandoroidea Rafinesque, 1815 (86)
Superfamily Pholadomyoidea W. King, 1844 (61)
Family Arenigomyidae J. G. Carter, 2011 † (1)
Family Margaritariidae H. E. Vokes, 1964 †
Family Megadesmidae H. E. Vokes, 1967 †
Family Parilimyidae B. Morton, 1981 (23)
Family Pholadomyidae W. King, 1844 (35)
Genus Agrawalimya C. S. P. Singh, Jaitly & Pandey, 1982 † (1)
Genus Arcomya F. A. Roemer, 1839 † accepted as Pachymya (Arcomya) F. A. Roemer, 1839 †
Genus Argyromya P. Fischer, 1887 † (1)
Genus Coloradomya Petuch, 1988 † (1)
Genus Cosmomya Holdhaus, 1913 † (1)
Genus Exochorhynchus Meek & Hayden, 1865 † (1)
Genus Flabellomya Rollier, 1911 † accepted as Pholadomya G. B. Sowerby I, 1823
Genus Goniomya Agassiz, 1842 † (5)
Genus Homomya Agassiz, 1843 † (2)
Genus Lysianassa Münster, 1838 † accepted as Goniomya Agassiz, 1842 †
Genus Machomya de Loriol, 1868 † (1)
Genus Nipponopanacca T. Habe, 1977 accepted as Pholadomya (Nipponopanacca) T. Habe, 1977
Genus Pachymya J. De C. Sowerby, 1826 † (3)
Subgenus Pachymya (Arcomya) F. A. Roemer, 1839 † represented as Pachymya J. De C. Sowerby, 1826 †
Subgenus Pachymya (Pachymya) J. De C. Sowerby, 1826 † represented as Pachymya J. De C. Sowerby, 1826 †
Species Pachymya arcacea (Seebach, 1864) †
Species Pachymya crimica Yanin, 1982 †
Species Pachymya gigas J. De C. Sowerby, 1826 †
Genus Pholadomia [sic] † accepted as Pholadomya G. B. Sowerby I, 1823
Genus Pholadomya G. B. Sowerby I, 1823 (19)
Family Ucumariidae T. M. Sánchez, 2003 † (2)
Superfamily Poromyoidea Dall, 1886 (78)
Superfamily Thracioidea Stoliczka, 1870 (1839) (189)
Superfamily Verticordioidea Stoliczka, 1870 (148)
Family Cercomyidae Crickmay, 1936 † accepted as Laternulidae Hedley, 1918 (1840)
Superorder Imparidentia (10 368)
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