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)
- Genus Afrolucina Cosel, 2006 (2)
- Genus Alucinoma T. Habe, 1958 (3)
- Genus Anodontia Link, 1807 (10)
- Genus Callucina Dall, 1901 (19)
- Genus Dulcina Cosel & Bouchet, 2008 (7)
- Genus Epidulcina Cosel & Bouchet, 2008 (2)
- Genus Gonimyrtea Marwick, 1929 (19)
- Genus Leucosphaera J. D. Taylor & Glover, 2005 (4)
- Genus Lissosphaira Olsson, 1961 accepted as Anodontia Link, 1807
- Genus Minilucina Cosel & Bouchet, 2008 (1)
- Genus Myrtina Glover & J. D. Taylor, 2007 (17)
- Genus Neophysema J. D. Taylor & Glover, 2005 (2)
- Genus Opalocina Glover & J. D. Taylor, 2016 (3)
- Genus Pseudolucinisca Chavan, 1959 (4)
- Genus Rawya Strougo, 1975 †
- Genus Tinalucina Cosel, 2006 (1)
- Genus Ustalucina J. D. Taylor & Glover, 2021 (2)
- 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)
- 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