Between brackets is the number of accepted species

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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Subclass Autobranchia (23 295)
- Subclass Bivalvia incertae sedis (7)
- Subclass Palaeotaxodonta accepted as Nuculida
- Subclass Paleoheterodonta accepted as Palaeoheterodonta
- Subclass Protobranchia (1 365)
- Order Afghanodesmatida † (17)
- Order Manzanellida (40)
- Order Nuculanida (856)
- Superfamily Nuculanoidea H. Adams & A. Adams, 1858 (1854) (841)
- Family Adranidae Scarlato & Starobogatov, 1979 accepted as Nuculanidae H. Adams & A. Adams, 1858 (1854)
- Family Bathyspinulidae Coan & Valentich-Scott, 1997 (19)
- Family Cadomiidae Scarlato & Starobogatov, 1979 † (2)
- Family Cucullellidae P. Fischer, 1886 † (9)
- Family Glomidae A. E. Verrill & K. J. Bush, 1897 accepted as Pristiglomidae H. L. Sanders & J. A. Allen, 1973
- Family Isoarcidae Keen, 1969 † (6)
- Family Lametilidae J. A. Allen & H. L. Sanders, 1973 (2)
- Family Ledidae Gray, 1854 accepted as Nuculanidae H. Adams & A. Adams, 1858 (1854)
- Family Malletidae H. Adams & A. Adams, 1858 accepted as Malletiidae H. Adams & A. Adams, 1858 (1846)
- Family Malletiidae H. Adams & A. Adams, 1858 (1846) (155)
- Family Neilonellidae Schileyko, 1989 (53)
- Family Nuculanidae H. Adams & A. Adams, 1858 (1854) (361)
- Family Phaseolidae Scarlato & Starobogatov, 1971 (2)
- Family Polidevciidae Kumpera, Prantl & Růžička, 1960 † (6)
- Family Poroledidae Scarlato & Starobogatov, 1979 accepted as Poroledinae Scarlato & Starobogatov, 1979
- Family Pristiglomidae H. L. Sanders & J. A. Allen, 1973 (3)
- Family Pseudocyrtodontidae Maillieux, 1939 † (2)
- Family Radiidentidae Egorova & Starobogatov, 1975 accepted as Siliculidae J. A. Allen & H. L. Sanders, 1973
- Family Saturniidae J. A. Allen & F. Hannah, 1986 accepted as Neilonellidae Schileyko, 1989
- Family Siliculidae J. A. Allen & H. L. Sanders, 1973 (7)
- Genus Radiidens Egorova & Starobogatov, 1975 accepted as Silicula Jeffreys, 1879
- Genus Silicula Jeffreys, 1879 (7)
- Species Silicula alleni F. R. Bernard, 1989
- Species Silicula beringiana Kamenev, 2014
- Species Silicula filatovae J. A. Allen & H. L. Sanders, 1973
- Species Silicula fragilis Jeffreys, 1879
- Species Silicula mcalesteri J. A. Allen & H. L. Sanders, 1973 accepted as Silicula patagonica (Dall, 1908)
- Species Silicula okutanii Kamenev, 2014
- Species Silicula patagonica (Dall, 1908)
- Species Silicula rouchi E. Lamy, 1910
- Species Silicula tumidula Monterosato, 1880 accepted as Microgloma pusilla (Jeffreys, 1879)
- Family Solenellidae A. d'Orbigny, 1846 accepted as Malletiidae H. Adams & A. Adams, 1858 (1846)
- Family Spinulidae J. A. Allen & H. L. Sanders, 1982 accepted as Ledellinae J. A. Allen & H. L. Sanders, 1982
- Family Strabidae Prantl & Růžička, 1954 † (5)
- Family Tindariidae A. E. Verrill & K. J. Bush, 1897 (28)
- Family Yoldiidae Dall, 1908 (181)
- Family Zealedidae Scarlato & Starobogatov, 1979 accepted as Ledellinae J. A. Allen & H. L. Sanders, 1982
- Superfamily Pristiglomoidea H. L. Sanders & J. A. Allen, 1973 accepted as Nuculanoidea H. Adams & A. Adams, 1858 (1854)
- Superfamily Sareptoidea Stoliczka, 1870 (15)
- Order Nuculida (359)
- Order Protobranchia incertae sedis † (4)
- Order Solemyida (89)
- Infraclass Cryptodonta † (342)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- 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