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)
- Family Frenguelliellidae M. Nakano, 1960 † (14)
- Family Laevitrigoniidae Saveliev, 1958 † (2)
- Family Myophorellidae T. Kobayashi, 1954 † (100)
- Family Myophorelloidea incertae sedis †
- Family Rutitrigoniidae van Hoepen, 1929 † (79)
- Family Steinmanellidae M. R. Cooper, 1991 † (45)
- Subfamily Steinmanellinae M. R. Cooper, 1991 † (24)
- Subfamily Yaadiinae M. R. Cooper & H. A. Leanza, 2017 † (21)
- Genus Louella M. R. Cooper & H. A. Leanza, 2017 † (2)
- Genus Packardella T. Kobayashi & Amano, 1955 †
- Genus Popenoella M. R. Cooper & H. A. Leanza, 2017 † (6)
- Genus Setotrigonia T. Kobayashi & Amano, 1955 † accepted as Yeharella T. Kobayashi & Amano, 1955 †
- Genus Tashiroella M. R. Cooper & H. A. Leanza, 2017 † (2)
- Genus Yaadia Crickmay, 1930 † (4)
- Genus Yeharella T. Kobayashi & Amano, 1955 † (7)
- Species Yeharella ainuana (Yabe & Nagao, 1928) †
- Species Yeharella deckeina (Kubota, 1952) †
- Species Yeharella japonica (Yehara, 1923) †
- Species Yeharella kimurai (Tokunaga & Shimizu, 1926) †
- Species Yeharella lymani (T. Kobayashi & Amano, 1955) †
- Species Yeharella obsoleta (T. Kobayashi & Amano, 1955) †
- Species Yeharella shinoharai (T. Kobayashi & Amano, 1955) †
- Family Vaugoniidae T. Kobayashi, 1954 † (136)
- Superfamily Pseudocardinioidea Martinson, 1961 † (176)
- Superfamily Trigonioidea Lamarck, 1819 (350)
- 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