Between brackets is the number of accepted species

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- Mollusca (133 006)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 041)
- Subclass Autobranchia (23 319)
- Subclass Bivalvia incertae sedis (7)
- Subclass Palaeotaxodonta accepted as Nuculida
- Subclass Paleoheterodonta accepted as Palaeoheterodonta
- Subclass Protobranchia (1 373)
- Infraclass Cryptodonta † (342)
- Superorder Inoceramiformii † (288)
- Superfamily Inoceramoidea Giebel, 1852 † (187)
- Family Atomodesmatidae Waterhouse, 1976 † (1)
- Family Inoceramidae Giebel, 1852 † (179)
- Subfamily Bathmoceraminae Heinz, 1932 †
- Subfamily Boehmiceraminae Heinz, 1932 †
- Subfamily Cordiceraminae Heinz, 1932 †
- Subfamily Cremnoceraminae Heinz, 1932 †
- Subfamily Cricoceraminae Heinz, 1932 †
- Subfamily Cymatoceraminae Heinz, 1932 †
- Subfamily Gnesioceraminae Heinz, 1932 †
- Subfamily Haenleiniinae Heinz, 1932 †
- Subfamily Haenleininae [sic] † accepted as Haenleiniinae Heinz, 1932 †
- Subfamily Helioceraminae Heinz, 1932 †
- Subfamily Inoceraminae Giebel, 1852 † accepted as Inoceramidae Giebel, 1852 †
- Subfamily Mytiloidinae Heinz, 1932 † accepted as Inoceramidae Giebel, 1852 †
- Subfamily Orthoceraminae Heinz, 1932 †
- Subfamily Sphaeroceraminae Heinz, 1932 †
- Subfamily Stolleyiceraminae Heinz, 1932 †
- Subfamily Tactoceraminae Heinz, 1932 †
- Subfamily Tethyoceraminae Heinz, 1932 †
- Subfamily Volviceraminae Heinz, 1932 † accepted as Inoceramidae Giebel, 1852 †
- Genus Cataceramus L. R. Cox, 1969 † (18)
- Genus Cladoceramus Seitz, 1961 †
- Genus Cordiceramus Seitz, 1961 † (7)
- Genus Cremnoceramus L. R. Cox, 1969 † (6)
- Genus Didymotis K. Gerhardt, 1897 † (1)
- Genus Endocostea Whitfield, 1877 † (5)
- Genus Haenleinia J. Böhm, 1907 †
- Genus Inoceramus J. Sowerby, 1814 † (85)
- Genus Magadiceramus Seitz, 1970 † (2)
- Genus Mytiloida [sic] † accepted as Mytiloides Brongniart, 1822 †
- Genus Mytiloides Brongniart, 1822 † (14)
- Genus Parainoceramus L. R. Cox, 1955 † (1)
- Genus Parainoceramya Ros Franch, S. E. Damborenea, Márquez-Aliaga & Manceñido, 2015 † (3)
- Genus Platyceramus Seitz, 1961 † (4)
- Genus Posidonioceramus Walaszczyk & Cobban, 2016 † (2)
- Genus Rhyssomytiloides Hessel, 1988 † (5)
- Genus Sergipia Maury, 1925 † (2)
- Genus Sphenoceramus J. Böhm, 1915 † (12)
- Genus Spyridoceramus L. R. Cox, 1969 † (1)
- Genus Tethyoceramus Sornay, 1980 † (5)
- Species Tethyoceramus basseae (Sornay, 1980) †
- Species Tethyoceramus ernsti (Heinz, 1928) †
- Species Tethyoceramus madagascariensis (Heinz, 1933) †
- Species Tethyoceramus modestoides (Sornay, 1980) †
- Species Tethyoceramus wandereri (Andert, 1911) †
- Genus Volviceramus Stoliczka, 1871 † (6)
- Family Kolymiidae Kuznetsov, 1973 †
- Family Retroceramidae Koschelkina, 1980 † (7)
- Family Sphenoceramidae Heinz, 1932 † accepted as Inoceramidae Giebel, 1852 †
- Superfamily Posidonioidea Neumayr, 1891 † (101)
- Superorder Nepiomorphia † (54)
- Class Caudofoveata (143)
- Class Cephalopoda (1 845)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 864)
- 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 (1 381)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (753)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata