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)
- Infraclass Pteriomorphia (6 660)
- Superorder Eupteriomorphia
- Order Arcida (1 227)
- Order Colpomyida † (6)
- Order Cyrtodontida † (66)
- Order Limida (358)
- Order Myalinida † (576)
- Order Mytilida (707)
- Order Ostreida (706)
- Order Pectinida (3 004)
- Superfamily Anomiacea accepted as Anomioidea Rafinesque, 1815
- Superfamily Anomioidea Rafinesque, 1815 (73)
- Superfamily Aviculopectinoidea Meek & Hayden, 1865 † (98)
- Superfamily Buchioidea L. R. Cox, 1953 † (86)
- Superfamily Chaenocardioidea S. A. Miller, 1889 † (20)
- Superfamily Dimyoidea P. Fischer, 1886 (42)
- Superfamily Entolioidea Teppner, 1922 † (106)
- Superfamily Euchondrioidea Newell, 1938 † (14)
- Superfamily Eurydesmatoidea Reed, 1932 † (2)
- Superfamily Heteropectinoidea Beurlen, 1954 † (92)
- Superfamily Leiopectinoidea Krasilova, 1959 † (7)
- Superfamily Oxytomoidea Ichikawa, 1958 † (20)
- Superfamily Pectinacea accepted as Pectinoidea Rafinesque, 1815
- Superfamily Pectinoidea Rafinesque, 1815 (2 301)
- Family Cyclochlamydidae Dijkstra & Maestrati, 2012 (34)
- Family Neitheidae Sobetski, 1960 † (54)
- Family Pectinidae Rafinesque, 1815 (1 722)
- Family Pectinoidea incertae sedis (2)
- Family Pleuronectitidae Hautmann, 2011 † (13)
- Family Propeamussidae [sic] accepted as Propeamussiidae Abbott, 1954
- Family Propeamussiidae Abbott, 1954 (256)
- Genus Actinula [sic] accepted as Arctinula Thiele, 1934
- Genus Arctinula Thiele, 1934 accepted as Similipecten Winckworth, 1932
- Genus Bathyamussium Habe, 1951 accepted as Propeamussium De Gregorio, 1884
- Genus Bathypecten Schein-Fatton, 1985 accepted as Catillopecten Iredale, 1939
- Genus Catillopecten Iredale, 1939 (12)
- Genus Ctenamusium Iredale, 1929 accepted as Parvamussium Sacco, 1897
- Genus Ctenamussium [sic] accepted as Ctenamusium Iredale, 1929
- Genus Cyclopecten A. E. Verrill, 1897 (63)
- Subgenus Cyclopecten (Cyclochlamys) H. J. Finlay, 1926 accepted as Cyclochlamys H. J. Finlay, 1926
- Subgenus Cyclopecten (Cyclopecten) A. E. Verrill, 1897 accepted as Cyclopecten A. E. Verrill, 1897
- Subgenus Cyclopecten (Delectopecten) R. B. Stewart, 1930 accepted as Delectopecten R. B. Stewart, 1930
- Subgenus Cyclopecten (Hyalopecten) A. E. Verrill, 1897 accepted as Hyalopecten A. E. Verrill, 1897
- Species Cyclopecten abyssorum (G. O. Sars, 1878) accepted as Delectopecten vitreus (Gmelin, 1791)
- Species Cyclopecten acuminatus T. R. Waller, 2011 †
- Species Cyclopecten acutus Grau, 1959
- Species Cyclopecten aequatorialis (Thiele, 1931)
- Species Cyclopecten almirantensis (Olsson, 1922) †
- Species Cyclopecten ambiannulatus Schein, 1989
- Species Cyclopecten ambiguus Dijkstra & Maestrati, 2010
- Species Cyclopecten antiquatus (R. A. Philippi, 1844)
- Species Cyclopecten aotus (Olsson, 1922) †
- Species Cyclopecten argenteus F. R. Bernard, 1978 accepted as Delectopecten vancouverensis (Whiteaves, 1893)
- Species Cyclopecten barbarensis Grau, 1959
- Species Cyclopecten benthalis Grau, 1959
- Species Cyclopecten bistriatus (Dall, 1916)
- Species Cyclopecten brundisiensis Smriglio & Mariottini, 1990
- Species Cyclopecten cancellus Dijkstra, 1991
- Species Cyclopecten capeverdensis Dijkstra & Goud, 2002
- Species Cyclopecten carlottensis F. R. Bernard, 1968
- Species Cyclopecten cassiculus Dijkstra & Maestrati, 2015
- Species Cyclopecten catalinensis (Willett, 1931)
- Species Cyclopecten cincinnatus Dijkstra & Gofas, 2004
- Species Cyclopecten cocosensis (Dall, 1908)
- Species Cyclopecten compitum Marwick, 1929 † accepted as Talochlamys chathamensis (F. W. Hutton, 1873) †
- Species Cyclopecten comptulus Dijkstra & Maestrati, 2013
- Species Cyclopecten culebrensis (E. A. Smith, 1885)
- Species Cyclopecten davidsoni (Dall, 1897)
- Species Cyclopecten defuniak (J. Gardner, 1926) †
- Species Cyclopecten diktuotus (J. Gardner, 1926) †
- Species Cyclopecten distinctus (E. A. Smith, 1885)
- Species Cyclopecten eous (Melvill & Standen, 1907) accepted as Similipecten eous (Melvill, 1907)
- Species Cyclopecten erythraeensis Dijkstra & R. Janssen, 2013
- Species Cyclopecten exquisitus Grau, 1959
- Species Cyclopecten falklandicus Dell, 1964
- Species Cyclopecten favus Hedley, 1902 accepted as Chlamydella favus (Hedley, 1902)
- Species Cyclopecten fluctuatus (Bavay, 1905) accepted as Delectopecten fluctuatus (Bavay, 1905)
- Species Cyclopecten fluctuosus Dijkstra & B. A. Marshall, 2008
- Species Cyclopecten gaussianus (Thiele, 1912) accepted as Cyclochlamys gaussiana (Thiele, 1912)
- Species Cyclopecten greenlandicus (G. B. Sowerby II, 1842) accepted as Similipecten greenlandicus (G. B. Sowerby II, 1842)
- Species Cyclopecten guppyi (Dall, 1898) †
- Species Cyclopecten hexagonalis A. W. B. Powell, 1958 accepted as Cyclochlamys hexagonalis (A. W. B. Powell, 1958)
- Species Cyclopecten horridus Dijkstra, 1995
- Species Cyclopecten hoskynsi (Forbes, 1844)
- Species Cyclopecten imbrifer (Lovén, 1846) accepted as Cyclopecten hoskynsi (Forbes, 1844)
- Species Cyclopecten incongruus (Dall, 1916)
- Species Cyclopecten incubans Barnard, 1964
- Species Cyclopecten inoculatus Dijkstra & Maestrati, 2017
- Species Cyclopecten kantori Dijkstra & Maestrati, 2015
- Species Cyclopecten kapalae Dijkstra, 1990
- Species Cyclopecten kermadecensis (E. A. Smith, 1885)
- Species Cyclopecten knudseni F. R. Bernard, 1978 accepted as Catillopecten knudseni (F. R. Bernard, 1978)
- Species Cyclopecten leptaleum (A. E. Verrill, 1884) accepted as Cyclopecten leptaleus (A. E. Verrill, 1884)
- Species Cyclopecten leptaleus (A. E. Verrill, 1884)
- Species Cyclopecten liriope (Dall, 1908)
- Species Cyclopecten lompicoensis (Arnold, 1906) †
- Species Cyclopecten martensi Dijkstra, 1998 accepted as Cyclochlamys martensi (Dijkstra, 1998)
- Species Cyclopecten martinezensis (Gabb, 1869) †
- Species Cyclopecten mestayerae Dell, 1956 accepted as Cyclochlamys mestayerae (Dell, 1956)
- Species Cyclopecten meteorae Dijkstra & R. Janssen, 2013
- Species Cyclopecten multistriatus K. Linse, 2002
- Species Cyclopecten nakaii Okutani, 1962
- Species Cyclopecten nanus A. E. Verrill & K. J. Bush, 1897 accepted as Similipecten nanus (A. E. Verrill & K. J. Bush, 1897)
- Species Cyclopecten neoceanicus Dall, 1908 accepted as Hyalopecten neoceanicus (Dall, 1908)
- Species Cyclopecten nepeanensis Pritchard & Gatliff, 1904 accepted as Cyclochlamys nepeanensis (Pritchard & Gatliff, 1904)
- Species Cyclopecten nipponensis Okutani, 1962
- Species Cyclopecten obliquus Hedley, 1902 accepted as Cyclochlamys favus (Hedley, 1902)
- Species Cyclopecten ohashii Matsubara, 2022 †
- Species Cyclopecten oligolepis (A. P. Brown & Pilsbry, 1913) †
- Species Cyclopecten pellucidulus Dijkstra, 1995
- Species Cyclopecten pernomus (Hertlein, 1935)
- Species Cyclopecten powelli Dell, 1956
- Species Cyclopecten pteriola (Melvill & Standen, 1907) accepted as Cyclochlamys pteriola (Melvill & Standen, 1907)
- Species Cyclopecten pustulosus (A. E. Verrill, 1873) accepted as Cyclopecten hoskynsi (Forbes, 1844)
- Species Cyclopecten reticulatus Dijkstra & Beu, 2018
- Species Cyclopecten reticulum (Dall, 1886) accepted as Cyclopecten reticulus (Dall, 1886)
- Species Cyclopecten reticulus (Dall, 1886)
- Species Cyclopecten ringnesia (Dall, 1924)
- Species Cyclopecten ringnesius (Dall, 1924) accepted as Cyclopecten ringnesia (Dall, 1924)
- Species Cyclopecten ryukyuensis Hayami & Kase, 1993
- Species Cyclopecten secundus (H. J. Finlay, 1926)
- Species Cyclopecten shepherdi Laws, 1939 † accepted as Cyclochlamys shepherdi (Laws, 1939) †
- Species Cyclopecten simplex A. E. Verrill, 1897
- Species Cyclopecten squamiformis F. R. Bernard, 1978 accepted as Catillopecten squamiformis (F. R. Bernard, 1978)
- Species Cyclopecten strigillatus (Dall, 1889) accepted as Hyalopecten strigillatus (Dall, 1886)
- Species Cyclopecten subhyalinus (E. A. Smith, 1885)
- Species Cyclopecten subimbrifer A. E. Verrill & K. J. Bush, 1897 accepted as Cyclopecten imbrifer (Lovén, 1846)
- Species Cyclopecten textus Dijkstra & B. A. Marshall, 2008
- Species Cyclopecten thalassinus (Dall, 1886)
- Species Cyclopecten thielei A. W. B. Powell, 1958 accepted as Cyclochlamys gaussiana (Thiele, 1912)
- Species Cyclopecten thyrideus (Melvill, 1907) accepted as Parvamussium thyrideum (Melvill, 1907)
- Species Cyclopecten transenna (Suter, 1913) accepted as Cyclochlamys transenna (Suter, 1913)
- Species Cyclopecten undatus (A. E. Verrill & S. Smith, 1885) accepted as Hyalopecten pudicus (E. A. Smith, 1885)
- Species Cyclopecten vidalensis Barnard, 1964 accepted as Parvamussium vidalense (Barnard, 1964)
- Species Cyclopecten vimineus Dijkstra & Gofas, 2004
- Species Cyclopecten vitreus (Gmelin, 1791) accepted as Delectopecten vitreus (Gmelin, 1791)
- Species Cyclopecten zalaya T. R. Waller, 2011 †
- Species Cyclopecten zephyrus Grau, 1959
- Genus Filamussium T. R. Waller, 2006 † (3)
- Genus Flavamussium T. Habe, 1951 accepted as Propeamussium De Gregorio, 1884
- Genus Glyptamusium Iredale, 1939 accepted as Parvamussium Sacco, 1897
- Genus Luteamussium Oyama, 1951 accepted as Propeamussium De Gregorio, 1884
- Genus Micramussium Oyama, 1951 accepted as Propeamussium De Gregorio, 1884
- Genus Occultamussium Korobkov, 1936 † accepted as Propeamussium De Gregorio, 1884
- Genus Paramusium A. E. Verrill, 1897 accepted as Propeamussium De Gregorio, 1884
- Genus Paramussium [sic] accepted as Parvamussium Sacco, 1897
- Genus Parvamussium Sacco, 1897 (117)
- Genus Polynemamussium T. Habe, 1951 accepted as Parvamussium Sacco, 1897
- Genus Propeamusium [sic] accepted as Propeamussium De Gregorio, 1884
- Genus Propeamussium De Gregorio, 1884 (52)
- Genus Similipecten Winckworth, 1932 (9)
- Genus Squamamussium Oyama, 1944 accepted as Parvamussium Sacco, 1897
- Genus Variamussium Sacco, 1897 accepted as Parvamussium Sacco, 1897
- Family Spondylidae J. E. Gray, 1826 (209)
- Family Spondylopectinidae Kasum-Zade & Romanov, 1987 † accepted as Spondylidae J. E. Gray, 1826
- Family Syncyclonematidae T. R. Waller, 1978 accepted as Entoliidae Teppner, 1922
- Family Tosapectinidae Trushchelev, 1984 † (11)
- Superfamily Plicatuloidea Gray, 1854 (56)
- Superfamily Prospondyloidea Pchelintseva, 1960 † (13)
- Superfamily Pseudomonotoidea Newell, 1938 † (2)
- Superfamily Pterinopectinoidea Newell, 1938 † (72)
- Family Pernopectinoidea Newell, 1938 accepted as Entolioidea Teppner, 1922 †
- Family Saharopteriidae G. Termier & H. Termier, 1972 †
- Order Pteriida accepted as Ostreida
- Order Pteriomorphia incertae sedis † (1)
- Superfamily Yunannioidea R.-J. Zhang & Z.-J. Niu, 2021 † (2)
- Family Ischyrodontidae Scarlato & Starobogatov, 1979 † (2)
- Family Matheriidae Scarlato & Starobogatov, 1979 † (1)
- Family Myodakryotidae Tunnicliff, 1987 † (4)
- 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