Between brackets is the number of accepted species

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- Mollusca (132 754)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 992)
- Subclass Autobranchia (23 278)
- Infraclass Heteroconchia (16 634)
- Subterclass Archiheterodonta (1 205)
- Subterclass Euheterodonta (11 356)
- Superorder Anomalodesmata (987)
- Superorder Imparidentia (10 336)
- Order Adapedonta (260)
- Order Cardiida (3 055)
- Order Galeommatida (791)
- Order Gastrochaenida (43)
- Order Hiatellida represented as Adapedonta
- Order Hippuritida † (321)
- Order Lucinida (997)
- Superfamily Lucinacea accepted as Lucinoidea J. Fleming, 1828
- Superfamily Lucinoidea J. Fleming, 1828 (801)
- Family Codakiidae Iredale, 1937 accepted as Codakiinae Iredale, 1937
- Family Corbidae Stoliczka, 1870 accepted as Fimbriinae Nicol, 1950
- Family Fimbriidae Nicol, 1950 (1870) accepted as Fimbriinae Nicol, 1950
- Family Lucinidae J. Fleming, 1828 (793)
- Subfamily Codakiinae Iredale, 1937 (102)
- Subfamily Corbinae Stoliczka, 1870 accepted as Fimbriinae Nicol, 1950
- Subfamily Fimbriinae Nicol, 1950 (71)
- Subfamily Leucosphaerinae J. D. Taylor & Glover, 2011 (96)
- Subfamily Lucinidae incertae sedis (71)
- Subfamily Lucininae J. Fleming, 1828 (307)
- Subfamily Milthinae Chavan, 1969 (29)
- Subfamily Monitilorinae J. D. Taylor & Glover, 2011 (12)
- Subfamily Myrteinae Chavan, 1969 (72)
- Genus Beauvoisina Kiel, K. A. Campbell & C. Gaillard, 2010 † (1)
- Genus Cubatea Kiel, K. A. Campbell & C. Gaillard, 2010 † (2)
- Genus Elliptiolucina Cosel & Bouchet, 2008 (10)
- Genus Eulopia Dall, 1901 (1)
- Genus Gardnerella Chavan, 1951 † (1)
- Genus Gloverina Cosel & Bouchet, 2008 (2)
- Genus Graecina Cosel, 2006 (2)
- Genus Jorgenia J. D. Taylor & Glover, 2009 (4)
- Species Jorgenia compressa (Dall, 1881)
- Species Jorgenia gracilis J. D. Taylor & Glover, 2009
- Species Jorgenia louisiana J. D. Taylor & Glover, 2009
- Species Jorgenia luteophila J. D. Taylor & Glover, 2009
- Genus Lirotarte Olsson, 1964 † accepted as Tellidorella S. S. Berry, 1963
- Genus Lovaralucina Prinoth & Posenato, 2023 † (1)
- Genus Myrtaea [sic] accepted as Myrtea W. Turton, 1822
- Genus Myrtea W. Turton, 1822 (33)
- Genus Notomyrtea Iredale, 1924 (2)
- Genus Rostrilucina Cosel & Bouchet, 2008 (2)
- Genus Solelucina Glover & J. D. Taylor, 2007 (1)
- Genus Taylorina Cosel & Bouchet, 2008 (4)
- Genus Tehamatea Kiel, 2013 † (4)
- Genus Tellidorella S. S. Berry, 1963 (2)
- Subfamily Pegophyseminae J. D. Taylor & Glover, 2011 (32)
- Genus Ezolucina Amano, Jenkins, Kurihara & Kiel, 2008 † (1)
- Family Mactromyidae L. R. Cox, 1929 † accepted as Edmondiidae W. King, 1850 †
- Family Paracyclidae P. A. Johnston, 1993 † (8)
- Superfamily Thyasiroidea Dall, 1900 (1895) (196)
- 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 (6 644)
- 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 (1 832)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 679)
- 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