Between brackets is the number of accepted species

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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Subclass Autobranchia (23 295)
- 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)
- Superfamily Galeommatoidea J. E. Gray, 1840 (791)
- Family Basterotiidae Cossmann, 1909 (64)
- Subfamily Saxicavellinae P. H. Scott, 1994 represented as Basterotiidae Cossmann, 1909
- Genus Anisodonta Deshayes, 1857 (11)
- Genus Arcinella R. A. Philippi, 1844 accepted as Basterotina Coan, 1999
- Genus Atopomya P. G. Oliver, 2013 (1)
- Species Atopomya dolobrata P. G. Oliver, 2013
- Genus Basterotia M. Hörnes, 1859 (27)
- Genus Basterotina Coan, 1999 (2)
- Genus Ensitellops Olsson & Harbison, 1953 (3)
- Genus Eucharis Récluz, 1850 accepted as Basterotia M. Hörnes, 1859
- Genus Fulcrella Cossmann, 1886 † (8)
- Genus Harlea Gray, 1842 accepted as Basterotia M. Hörnes, 1859
- Genus Isoconcha Dautzenberg & H. Fischer, 1911 (3)
- Genus Myalina Conrad, 1845 accepted as Paramya Conrad, 1860
- Genus Paramya Conrad, 1860 (2)
- Genus Physoida Pallary, 1900 (1)
- Genus Saxicavella P. Fischer, 1878 (6)
- Genus Tahunanuia A. W. B. Powell, 1952 accepted as Anisodonta (Tahunanuia) A. W. B. Powell, 1952
- Family Chlamydoconchidae Dall, 1884 accepted as Galeommatidae Gray, 1840
- Family Ephippodontidae Scarlato & Starobogatov, 1979 accepted as Galeommatidae Gray, 1840
- Family Erycinidae Deshayes, 1850 accepted as Lasaeidae J. E. Gray, 1842
- Family Eucharidae Récluz, 1869 accepted as Basterotiidae Cossmann, 1909
- Family Galeommatidae Gray, 1840 (196)
- Family Kelliidae Forbes & Hanley, 1848 accepted as Lasaeidae J. E. Gray, 1842
- Family Kellyidae Forbes & Hanley, 1848 accepted as Kelliidae Forbes & Hanley, 1848
- Family Lasaeidae J. E. Gray, 1842 (531)
- Family Leptonidae Gray, 1847 accepted as Lasaeidae J. E. Gray, 1842
- Family Montacutidae W. Clark, 1855 accepted as Montacutinae W. Clark, 1855
- Family Vasconiellidae Scarlato & Starobogatov, 1979 accepted as Galeommatidae Gray, 1840
- 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 (6 658)
- 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 (102 697)
- 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