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)
- 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)
- Subfamily Lasaeinae represented as Lasaeidae J. E. Gray, 1842
- Subfamily Montacutinae W. Clark, 1855 (218)
- Genus Aligena H. C. Lea, 1843 (4)
- Genus Amerycina Chavan, 1969 (6)
- Genus Anapa J. E. Gray, 1842 accepted as Lasaea T. Brown, 1827
- Genus Anomalokellia Cossmann, 1887 † (2)
- Genus Arculus Monterosato, 1909 (2)
- Genus Arthritica H. J. Finlay, 1926 (19)
- Genus Boreacola F. R. Bernard, 1979 (1)
- Genus Bornia R. A. Philippi, 1836 (15)
- Subgenus Bornia (Bornia) R. A. Philippi, 1836 accepted as Bornia R. A. Philippi, 1836
- Subgenus Bornia (Ceratobornia) Dall, 1899 accepted as Ceratobornia Dall, 1899
- Subgenus Bornia (Pythina) Hinds, 1845 accepted as Pythina Hinds, 1845
- Species Bornia (Pythina) africana Bartsch, 1915 accepted as Bornia africana Bartsch, 1915
- Species Bornia aartseni Gofas, 2012
- Species Bornia africana Bartsch, 1915 accepted as Pseudopythina africana (Bartsch, 1915)
- Species Bornia albanyana W. H. Turton, 1932 accepted as Scacchia subradiata (A. A. Gould, 1861)
- Species Bornia arfica Bartsch, 1915 accepted as Neolepton atlanticum (E. A. Smith, 1890)
- Species Bornia balalaika Cosel, 1995
- Species Bornia barbadensis Dall, 1899 accepted as Solecardia barbadensis (Dall, 1899)
- Species Bornia bibsae Nowell-Usticke, 1969 accepted as Cymatioa undulata (Thiele, 1910)
- Species Bornia canariensis D. F. Hoeksema & Simons, 2011
- Species Bornia carriei E. Lamy, 1911 accepted as Borniopsis striatissima (G. B. Sowerby II, 1865)
- Species Bornia chiclaya Olsson, 1961 accepted as Ceratobornia chiclaya (Olsson, 1961)
- Species Bornia complanata R. A. Philippi, 1836 accepted as Bornia geoffroyi (Payraudeau, 1826)
- Species Bornia confusa Della Bella & Tabanelli, 2007 †
- Species Bornia cooki Willett, 1937 † accepted as Cymatioa cookae (Willett, 1937)
- Species Bornia corbuloides R. A. Philippi, 1836 accepted as Bornia sebetia (O. G. Costa, 1830)
- Species Bornia deltoidea (S. V. Wood, 1851) †
- Species Bornia egretta Olsson, 1961 accepted as Diarmaidia egretta (Olsson, 1961)
- Species Bornia elliptica (Cossmann, 1887) †
- Species Bornia farica Bartsch, 1915
- Species Bornia filosa Hedley, 1902 accepted as Borniola filosa (Hedley, 1902)
- Species Bornia flabellaris Darragh, 1997 † accepted as Borniola flabellaris (Darragh, 1997) †
- Species Bornia geoffroyi (Payraudeau, 1826)
- Species Bornia inflata R. A. Philippi, 1836 accepted as Kellia suborbicularis (Montagu, 1803)
- Species Bornia infraeocaenica (Cossmann, 1902) †
- Species Bornia joncheriacensis (Staadt, 1913) †
- Species Bornia laubrierei (Cossmann, 1887) †
- Species Bornia lepida Hedley, 1906 accepted as Borniola lepida (Hedley, 1906)
- Species Bornia longipes (W. Stimpson, 1855) accepted as Ceratobornia longipes (W. Stimpson, 1855)
- Species Bornia luticola Valenciennes, 1846 accepted as Kellia laperousii (Deshayes, 1839)
- Species Bornia oblonga W. H. Turton, 1932 accepted as Pseudopythina africana (Bartsch, 1915)
- Species Bornia obtusa (P. P. Carpenter, 1865) accepted as Montacuta obtusa P. P. Carpenter, 1865
- Species Bornia papyracea (Deshayes, 1856) accepted as Cymatioa papyracea (Deshayes, 1856)
- Species Bornia radiata Hedley, 1905 accepted as Borniola radiata (Hedley, 1905)
- Species Bornia retifera Dall, 1899 accepted as Rhamphidonta retifera (Dall, 1899)
- Species Bornia sebetia (O. G. Costa, 1830)
- Species Bornia seminulum R. A. Philippi, 1836 accepted as Lasaea rubra (Montagu, 1803)
- Species Bornia signata (Deshayes, 1858) †
- Species Bornia subovalis W. H. Turton, 1932 accepted as Scacchia carifa (Bartsch, 1915)
- Species Bornia subtriangularis (Deshayes, 1858) †
- Species Bornia subventricosa W. H. Turton, 1932
- Species Bornia tacaguana Weisbord, 1964 †
- Species Bornia undulata Thiele, 1910 accepted as Cymatioa undulata (Thiele, 1910)
- Species Bornia venada Olsson, 1961 accepted as Solecardia venada (Olsson, 1961)
- Species Bornia walvisensis Zettler & L. Hoffman, 2021
- Species Bornia zorritensis Olsson, 1961 accepted as Diarmaidia zorritensis (Olsson, 1961)
- Genus Borniola Iredale, 1924 (20)
- Genus Borniopsis T. Habe, 1959 (11)
- Genus Byssobornia Iredale, 1936 accepted as Borniola Iredale, 1924
- Genus Ceratobornia Dall, 1899 (3)
- Genus Chironia Deshayes, 1839 accepted as Kellia W. Turton, 1822
- Genus Cicatellia Laseron, 1956 (1)
- Genus Crenimargo S. S. Berry, 1963 accepted as Cymatioa S. S. Berry, 1964
- Genus Cycladella P. P. Carpenter, 1865
- Genus Cycladina Cantraine, 1835 accepted as Lasaea T. Brown, 1827
- Genus Diarmaidia Valentich-Scott, 2012 (3)
- Genus Diplodontina Stempell, 1899 accepted as Kellia W. Turton, 1822
- Genus Erycina Lamarck, 1805 (38)
- Genus Eryx Swainson, 1840 accepted as Erycina Lamarck, 1805
- Genus Eupoleme Leach, 1852 accepted as Lepton W. Turton, 1822
- Genus Glibertia van der Meulen, 1951 † (1)
- Genus Gullerina Valentich-Scott, Coan & Zelaya, 2020 (1)
- Genus Hemilepton Cossmann, 1912 (4)
- Genus Hitia Dall, Bartsch & Rehder, 1938 (1)
- Genus Hyalokellia Habe, 1960 (2)
- Genus Isorobitella Keen, 1962 (2)
- Genus Kamekia Kuroda & Habe, 1971 (1)
- Genus Kaneoha Dall, Bartsch & Rehder, 1938 (1)
- Genus Kellia W. Turton, 1822 (37)
- Genus Kellya R. A. Philippi, 1853 accepted as Kellia W. Turton, 1822
- Genus Kellyia Bucquoy, Dautzenberg & Dollfus, 1892 accepted as Kellia W. Turton, 1822
- Genus Lasaea T. Brown, 1827 (25)
- Genus Lasaeina Cossmann, 1912 † (4)
- Genus Lasea accepted as Lasaea T. Brown, 1827
- Genus Lepton W. Turton, 1822 (10)
- Genus Lozouetia Cosel, 1995 (1)
- Genus Melliteryx Iredale, 1924 (10)
- Genus Mioerycina Kautsky, 1940 (2)
- Genus Mylitta [sic] accepted as Myllita A. d'Orbigny & Récluz, 1850
- Genus Myllita A. d'Orbigny & Récluz, 1850 (15)
- Genus Myllitella H. J. Finlay, 1926 accepted as Myllita (Myllitella) H. J. Finlay, 1926
- Genus Neaeromya Gabb, 1873 (5)
- Genus Nesobornia Dall, Bartsch & Rehder, 1938 (5)
- Genus Orobitella Dall, 1900 (5)
- Genus Oronthea Leach, 1852 accepted as Kellia W. Turton, 1822
- Genus Parabornia Boss, 1965 (2)
- Genus Paraborniola Habe, 1958 (1)
- Genus Planikellia Cossmann, 1887 † (6)
- Genus Platomysia T. Habe, 1951 (1)
- Genus Poronia Récluz, 1843 accepted as Lasaea T. Brown, 1827
- Genus Pristes P. P. Carpenter, 1864 (1)
- Genus Pristiphora P. P. Carpenter, 1866 accepted as Pristes P. P. Carpenter, 1864
- Genus Properycina Cerulli Irelli, 1908 † (1)
- Genus Pseudokellya Pelseneer, 1903 (4)
- Genus Pseudolepton Cossmann, 1896 † (1)
- Genus Pseudopythina P. Fischer, 1878 (6)
- Genus Pythinella Dall, 1899 (3)
- Genus Radobornia Dall, Bartsch & Rehder, 1938 (3)
- Genus Raetella Dall, 1898 accepted as Raeta J. E. Gray, 1853
- Genus Rhamphidonta F. R. Bernard, 1975 (1)
- Genus Rochefortia Vélain, 1877 accepted as Mysella Angas, 1877 (3)
- Genus Rochefortula H. J. Finlay, 1926 accepted as Borniola Iredale, 1924
- Genus Sacchia [sic] accepted as Scacchia R. A. Philippi, 1844
- Genus Sagamikellia Kuroda & T. Habe, 1971 (2)
- Genus Salpocola Lützen, Kosuge & Jespersen, 2008 (2)
- Genus Scacchia R. A. Philippi, 1844 (12)
- Genus Semeloidea Bartrum & A. W. B. Powell, 1928 † (6)
- Genus Semierycina Cossmann & Peyrot, 1912 accepted as Hemilepton Cossmann, 1912
- Genus Serridens Dall, 1899 accepted as Pristes P. P. Carpenter, 1864
- Genus Squillaconcha Kuroda & T. Habe, 1971 accepted as Borniopsis T. Habe, 1959
- Genus Thraciokellia Kuroda & T. Habe, 1971 (1)
- Genus Zemyllita H. J. Finlay, 1926 accepted as Myllita A. d'Orbigny & Récluz, 1850
- 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