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)
- 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)
- Genus Achasmea Dall, Bartsch & Rehder, 1938 (1)
- Genus Aclistothyra T. L. McGinty, 1955 (1)
- Genus Aenictomya P. G. Oliver & Chesney, 1997 (2)
- Genus Ambuscintilla Iredale, 1936 (2)
- Genus Amphilepida Dall, 1899 accepted as Lepirodes P. Fischer, 1887
- Genus Austrodevonia Middelfart & Craig, 2004 (2)
- Genus Axinodon A. E. Verrill & K. J. Bush, 1898 (5)
- Genus Barclayia H. Adams, 1875 (1)
- Genus Bellascintilla Coney, 1990 (1)
- Genus Chlamydoconcha Dall, 1884 (2)
- Genus Coleoconcha Barnard, 1964 (1)
- Genus Cymatioa S. S. Berry, 1964 (7)
- Genus Divarikellia Cossmann, 1887 † (8)
- Genus Divarikellya Cossmann, 1896 † accepted as Divarikellia Cossmann, 1887 †
- Genus Divariscintilla A. W. B. Powell, 1932 (7)
- Genus Duoconclavis Middelfart, 2005 (1)
- Genus Ephippodonta Tate, 1889 (2)
- Genus Ephippodontina Kuroda, 1945 (3)
- Genus Ephippodontoana T. Habe, 1951 (1)
- Genus Ephippodontomorpha Middelfart, 2005 (2)
- Genus Fastimysia Iredale, 1929 (1)
- Genus Galeomella [sic] accepted as Galeommella T. Habe, 1958
- Genus Galeomma W. Turton, 1825 (10)
- Genus Galeommella T. Habe, 1958 (2)
- Genus Galeomnia accepted as Galeomma W. Turton, 1825
- Genus Halcampicola P. G. Oliver, 1993 (1)
- Genus Hindsia Deshayes, 1858 † accepted as Hindsiella Stoliczka, 1871 †
- Genus Hindsiella Stoliczka, 1871 † (8)
- Genus Hirudinaria Scacchi, 1833 accepted as Galeomma W. Turton, 1825
- Genus Imisia Brusina, 1870 accepted as Galeomma W. Turton, 1825
- Genus Lactemiles Iredale, 1931 accepted as Scintilla Deshayes, 1856
- Genus Leiochasmea Dall, Bartsch & Rehder, 1938 (1)
- Genus Lepirodes P. Fischer, 1887 (12)
- Genus Levanderia Sturany, 1905 (1)
- Genus Libratula Pease, 1865 (1)
- Genus Lionelita Jousseaume, 1888 (2)
- Genus Marikellia Cotton & Godfrey, 1938 accepted as Scintillula Jousseaume, 1888
- Genus Nudiscintilla Lützen & C. Nielsen, 2005 (1)
- Genus Parthenope Scacchi, 1833 accepted as Galeomma W. Turton, 1825
- Genus Parvikellia Laseron, 1956 (3)
- Genus Passya Deshayes, 1856 † (1)
- Genus Phlyctaenachlamys Popham, 1939 (1)
- Genus Pileatona Laseron, 1956 (1)
- Genus Pseudogaleomma T. Habe, 1964 (5)
- Genus Pseudokellia Pelseneer, 1903 accepted as Pseudokellya Pelseneer, 1903
- Genus Pythina Hinds, 1845 (3)
- Genus Sagamiscintilla T. Habe, 1975 accepted as Scintilla Deshayes, 1856
- Genus Scintilla Deshayes, 1856 (48)
- Genus Scintillona H. J. Finlay, 1926 (3)
- Genus Scintillorbis Kuroda & T. Habe, 1971 accepted as Scintilla Deshayes, 1856
- Genus Scintillula Jousseaume, 1888 (12)
- Genus Scioberetia F. Bernard, 1895 (1)
- Genus Solecardia Conrad, 1849 (7)
- Subgenus Solecardia (Scintilla) Deshayes, 1856 accepted as Scintilla Deshayes, 1856
- Subgenus Solecardia (Scintillorbis) Dall, 1899 accepted as Vasconiella Dall, 1899
- Subgenus Solecardia (Spaniorinus) Dall, 1900 accepted as Spaniorinus Dall, 1900 †
- Species Solecardia antarctica Hedley, 1911 accepted as Waldo parasiticus (Dall, 1876)
- Species Solecardia barbadensis (Dall, 1899)
- Species Solecardia bryani Pilsbry, 1921 accepted as Radobornia bryani (Pilsbry, 1921)
- Species Solecardia chascax Pilsbry, 1921 accepted as Leiochasmea chascax (Pilsbry, 1921)
- Species Solecardia cryptozoica Hedley, 1917 accepted as Varotoga cryptozoica (Hedley, 1917)
- Species Solecardia durbanensis (G. B. Sowerby III, 1897) accepted as Scintilla durbanensis G. B. Sowerby III, 1897
- Species Solecardia eburnea Conrad, 1849
- Species Solecardia erythraea Selli, 1974 †
- Species Solecardia grovesi Valentich-Scott & Coan, 2012
- Species Solecardia hawaiensis Pilsbry, 1921 accepted as Nesobornia hawaiensis (Pilsbry, 1921)
- Subspecies Solecardia hawaiensis obesior Pilsbry, 1921 accepted as Nesobornia hawaiensis (Pilsbry, 1921)
- Species Solecardia minima Thiele, 1930
- Species Solecardia moerchii Dall, 1899
- Species Solecardia obliqua (G. B. Sowerby II, 1862) accepted as Scintilla dubia (Deshayes, 1856)
- Species Solecardia peruviana Olsson, 1961 accepted as Galeommella peruviana (Olsson, 1961)
- Species Solecardia queketti (G. B. Sowerby III, 1897) accepted as Scintilla queketti G. B. Sowerby III, 1897
- Species Solecardia rotunda (Jeffreys, 1881)
- Species Solecardia stigmatica Pilsbry, 1921 accepted as Brachiomya stigmatica (Pilsbry, 1921)
- Species Solecardia thaanumi Pilsbry, 1921 accepted as Achasmea thaanumi (Pilsbry, 1921)
- Species Solecardia venada (Olsson, 1961)
- Species Solecardia vera Thiele, 1930 accepted as Lepirodes ambiguus (Deshayes, 1855)
- Species Solecardia vitrea (Quoy & Gaimard, 1835) accepted as Lepirodes vitreus (Quoy & Gaimard, 1835)
- Genus Spaniorinus Dall, 1900 † (11)
- Genus Thyreopsis H. Adams, 1868 (1)
- Genus Troglodytoconcha Middelfart, 2005 (1)
- Genus Tryphomyax Olsson, 1961 (3)
- Genus Turquetia Vélain, 1877 (1)
- Genus Varotoga J. K. Allan, 1950 (2)
- Genus Varotoga Iredale, 1931 accepted as Varotoga J. K. Allan, 1950
- Genus Vasconia de Folin, 1873 † accepted as Hindsiella Stoliczka, 1871 †
- Genus Vasconiella Dall, 1899 (1)
- Genus Vaticinaria Dall, 1901 accepted as Axinodon A. E. Verrill & K. J. Bush, 1898
- Genus Vermitexta Laseron, 1956 (1)
- Genus Virmysella Iredale, 1930 accepted as Mysella Angas, 1877
- Genus Yamamotolepida T. Habe, 1976 (1)
- 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