Between brackets is the number of accepted species

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- Mollusca (133 306)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 081)
- Subclass Autobranchia (23 353)
- Infraclass Heteroconchia (16 677)
- Subterclass Archiheterodonta (1 212)
- Subterclass Euheterodonta (11 390)
- 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)
- Family Cardiomyidae Scarlato & Starobogatov, 1983 accepted as Cuspidariidae Dall, 1886
- Family Cuspidariidae Dall, 1886 (286)
- Genus Aulacophora Jeffreys, 1882 accepted as Cuspidaria Nardo, 1840
- Genus Austroneaera A. W. B. Powell, 1937 (10)
- Genus Bathyneaera Scarlato & Starobogatov, 1983 (7)
- Genus Bidentaria J. A. Allen & R. E. Morgan, 1981 accepted as Protocuspidaria J. A. Allen & R. E. Morgan, 1981
- Genus Cardiomya A. Adams, 1864 (62)
- Genus Cuspidaria Nardo, 1840 (128)
- Genus Edentaria J. A. Allen & R. E. Morgan, 1981 accepted as Protocuspidaria J. A. Allen & R. E. Morgan, 1981
- Genus Fabagella Cossmann, 1886 † (1)
- Genus Goniophora Jeffreys, 1883 accepted as Tropidomya Dall & E. A. Smith, 1886
- Genus Jeffreysomya F. Nordsieck, 1969 (1)
- Genus Krylovina Valentich-Scott, 2012 (1)
- Genus Kurodamya Okutani & Sakurai, 1964 accepted as Cardiomya A. Adams, 1864
- Genus Labromysa F. R. Bernard, 1989 accepted as Bathyneaera Scarlato & Starobogatov, 1983
- Genus Leiomya A. Adams, 1864 (2)
- Genus Luzonia Dall & E. A. Smith, 1890 (3)
- Genus Myonera Dall & E. A. Smith, 1886 (22)
- Genus Mytilomorpha Hind, 1899 † accepted as Goniophora J. Phillips, 1848 †
- Genus Naera [sic] accepted as Neaera J. E. Gray, 1833
- Genus Neaera J. E. Gray, 1833 accepted as Cuspidaria Nardo, 1840 (1)
- Genus Neara [sic] accepted as Neaera J. E. Gray, 1833
- Genus Nordoneaera Okutani, 1985 accepted as Cuspidaria Nardo, 1840
- Genus Octoporia Scarlato & Starobogatov, 1983 (5)
- Species Octoporia octaporosa (J. A. Allen & R. E. Morgan, 1981)
- Species Octoporia podobeda Krylova, 1994
- Species Octoporia poutiera J. A. Allen, 2011
- Species Octoporia rugosa Krylova, 1994
- Species Octoporia sinuosa Krylova, 1994
- Genus Paracuspidaria Karapunar, Werner, Fürsich & Nützel, 2020 † (2)
- Genus Plectodon P. P. Carpenter, 1864 (7)
- Genus Pseudogrippina B. A. Marshall, 2002 (1)
- Genus Pseudoneaera Sturany, 1899 (6)
- Genus Rengea Kuroda & Habe, 1971 (2)
- Genus Rhinoclama Dall & E. A. Smith, 1886 (21)
- Genus Rhinomya A. Adams, 1864 accepted as Rhinoclama Dall & E. A. Smith, 1886
- Genus Semicardiomya Scarlato & Starobogatov, 1983 accepted as Bathyneaera Scarlato & Starobogatov, 1983
- Genus Soyomya Okutani, 1985 (1)
- Genus Spathophora Jeffreys, 1882 accepted as Cardiomya A. Adams, 1864
- Genus Subcuspidaria Egorova, 1993 accepted as Cuspidaria (Subcuspidaria) Egorova, 1993
- Genus Thermomya C. Chen, Okutani, H. Watanabe & Kojima, 2018 (1)
- Genus Tropidomya Dall & E. A. Smith, 1886 (2)
- Genus Tropidophora Jeffreys, 1882 accepted as Tropidomya Dall & E. A. Smith, 1886
- Genus Venatomya Iredale, 1930 accepted as Cryptomya (Venatomya) Iredale, 1930
- Genus Vulcanomya Dall, 1886
- Family Halonymphidae Scarlato & Starobogatov, 1983 (13)
- Family Myoneridae Scarlato & Starobogatov, 1983 accepted as Cuspidariidae Dall, 1886
- Family Neaeridae Hidalgo, 1916 accepted as Cuspidariidae Dall, 1886
- Family Protocuspidariidae Scarlato & Starobogatov, 1983 (19)
- Family Spheniopsidae J. A. Gardner, 1928 (17)
- Superfamily Myochamoidea P. P. Carpenter, 1861 (55)
- Superfamily Pandoroidea Rafinesque, 1815 (86)
- Superfamily Pholadomyoidea W. King, 1844 (61)
- 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 (10 367)
- 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 (1 921)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 047)
- 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 (754)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata