Between brackets is the number of accepted species

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- Mollusca (132 848)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 011)
- Subclass Autobranchia (23 297)
- Infraclass Heteroconchia (16 637)
- Subterclass Archiheterodonta (1 208)
- Subterclass Euheterodonta (11 356)
- Subterclass Heterodonta
- Subterclass Palaeoheterodonta (4 072)
- Order Trigoniida (1 482)
- Superfamily Megatrigonioidea van Hoepen, 1929 † (336)
- Superfamily Myophorelloidea T. Kobayashi, 1954 † (376)
- Superfamily Pseudocardinioidea Martinson, 1961 † (176)
- Superfamily Trigonioidea Lamarck, 1819 (350)
- Family Costatoriidae Newell & Boyd, 1975 † accepted as Myophoriidae Bronn, 1849 †
- Family Eoastartidae Newell & Boyd, 1975 † accepted as Eoastartinae Newell & Boyd, 1975 †
- Family Eoschizodidae Newell & Boyd, 1975 † (6)
- Family Erugoniidae McRoberts, 2017 † (5)
- Family Groeberellidae E. Pérez, Reyes & S. E. Damborenea, 1995 † (1)
- Family Ladinomyidae Prinoth & Posenato, 2023 † (1)
- Family Myophoriidae Bronn, 1849 † (71)
- Family Prosogyrotrigoniidae T. Kobayashi, 1954 † (7)
- Family Scaphellinidae Newell & Ciriacks, 1962 † (3)
- Family Schizodidae Newell & Boyd, 1975 † (41)
- Family Sinodoridae Pojeta & R.-J. Zhang, 1984 † accepted as Sinodorinae Pojeta & R.-J. Zhang, 1984 †
- Family Trigoniidae Lamarck, 1819 (215)
- Subfamily Austrotrigoniinae Skwarko, 1968 † (30)
- Genus Austrotrigonia Skwarko, 1963 † (2)
- Genus Coxitrigonia M. R. Cooper, 2016 † (2)
- Genus Eselaevitrigonia T. Kobayashi & Mori, 1954 † (3)
- Genus Ghuneriella M. R. Cooper, 2016 † (1)
- Genus Indotrigonia Dietrich, 1933 † (7)
- Genus Kellygonia M. R. Cooper, 2016 † (3)
- Genus Kitchingonia M. R. Cooper, 2016 † (3)
- Species Kitchingonia dhosaensis (Kitchin, 1903) †
- Species Kitchingonia trapeziformis (Kitchin, 1903) †
- Species Kitchingonia tyna (Skwarko, 1981) †
- Genus Malagasitrigonia L. R. Cox, 1964 † (2)
- Genus Nambangonia M. R. Cooper, 2016 † (1)
- Genus Neopisthotrigonia M. R. Cooper, 2016 † (2)
- Genus Opisthotrigonia L. R. Cox, 1952 † (3)
- Genus Papuagonia M. R. Cooper, 2016 † (1)
- Genus Querandigonia M. R. Cooper, 2016 †
- Subfamily Minetrigoniinae T. Kobayashi, 1954 † (24)
- Subfamily Neotrigoniinae T. Kobayashi, 1954 (22)
- Subfamily Pleurotrigoniinae van Hoepen, 1929 † (19)
- Subfamily Trigoniinae Lamarck, 1819 † (93)
- Genus Geratrigonia T. Kobayashi, 1954 † (4)
- Genus Guineana Skwarko, 1967 † (1)
- Genus Heslingtonia C. A. Fleming, 1987 † (1)
- Genus Kyushutrigonia Tamura & Nishimura, 1994 † (1)
- Genus Latitrigonia T. Kobayashi, 1957 † (8)
- Genus Nipponitrigonia L. R. Cox, 1952 † (7)
- Genus Praemyophoria Khalfin, 1940 †
- Genus Psilotrigonia L. R. Cox, 1952 † (5)
- Genus Savelievitrigonia Repman, 1979 †
- Superfamily Trigonioidoidea L. R. Cox, 1952 † (226)
- Superfamily Trigonodoidea Modell, 1942 † (18)
- Order Unionida (2 579)
- Family Lyrodesmatidae P. Fischer, 1886 † (8)
- Family Pseudarcidae Scarlato & Starobogatov, 1979 † (3)
- Family Thoraliidae N. J. Morris, 1980 †
- Superorder Heteroconchia incertae sedis † (1)
- Infraclass Pteriomorphia (6 660)
- 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 (102 752)
- 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