Between brackets is the number of accepted species

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- Mollusca (133 296)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 081)
- Subclass Autobranchia (23 353)
- Infraclass Heteroconchia (16 677)
- Infraclass Pteriomorphia (6 676)
- Superorder Eupteriomorphia
- Order Arcida (1 227)
- Order Colpomyida † (6)
- Order Cyrtodontida † (67)
- Order Limida (359)
- Order Myalinida † (577)
- Order Mytilida (709)
- Order Ostreida (713)
- Order Pectinida (3 008)
- Superfamily Anomiacea accepted as Anomioidea Rafinesque, 1815
- Superfamily Anomioidea Rafinesque, 1815 (73)
- Superfamily Aviculopectinoidea Meek & Hayden, 1865 † (99)
- 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 (2 303)
- Family Cyclochlamydidae Dijkstra & Maestrati, 2012 (34)
- Family Neitheidae Sobetski, 1960 † (54)
- Subfamily Neitheinae Sobetski, 1960 † accepted as Neitheidae Sobetski, 1960 †
- Genus Neithea Drouët, 1825 † (54)
- Subgenus Neithea (Neithea) Drouët, 1825 † accepted as Neithea Drouët, 1825 † (1)
- Subgenus Neithea (Neithella) Hayami, 1965 † accepted as Neithella Hayami, 1965 †
- Subgenus Neithea (Neitheops) R. B. Stewart, 1930 † represented as Neithea Drouët, 1825 †
- Species Neithea acuticostata Futterer, 1892 † accepted as Neithea fleuriausiana (A. d'Orbigny, 1847) †
- Species Neithea aequicostata (Lamarck, 1819) †
- Species Neithea aketoensis Hayami, 1965 † accepted as Neithea nipponica Hayami, 1965 †
- Species Neithea almusana Pethö, 1896 † accepted as Neithella notabilis (Münster, 1833) †
- Species Neithea alpina (A. d'Orbigny, 1847) †
- Species Neithea alta Hayami, 1977 †
- Species Neithea altana Kniker, 1919 †
- Species Neithea angoliensis R. B. Newton, 1916 † accepted as Neithea coquandi (A. Péron, 1877) †
- Species Neithea aralensis Arkhangelsky, 1912 †
- Species Neithea atava (F. A. Roemer, 1839) †
- Species Neithea attockensis L. R. Cox, 1935 †
- Species Neithea austinensis Kniker, 1919 †
- Species Neithea bahianensis Brito, 1967 † accepted as Neithea alpina (A. d'Orbigny, 1847) †
- Species Neithea bellula (Cragin, 1893) †
- Species Neithea bexarensis (Stephenson, 1941) †
- Species Neithea biangulata Imlay, 1940 †
- Species Neithea boeckhi Pethö, 1906 † accepted as Neithea striatocostata (Goldfuss, 1833) †
- Species Neithea boesi Kniker, 1919 †
- Species Neithea budensis Kniker, 1919 †
- Species Neithea casteeli Kniker, 1919 †
- Species Neithea cometa (A. d'Orbigny, 1847) † accepted as Neithella notabilis (Münster, 1833) †
- Species Neithea coquandi (A. Péron, 1877) †
- Species Neithea coxi Mahmoud, 1955 † accepted as Neithea syriaca (Conrad, 1852) †
- Species Neithea daghestanica (Rengarten, 1909) † accepted as Neithea syriaca (Conrad, 1852) †
- Species Neithea decemcostata (A. d'Orbigny, 1847) †
- Species Neithea deshayana (Matheron, 1843) †
- Species Neithea dilatata (A. d'Orbigny, 1847) †
- Species Neithea duplicicosta (C. F. Roemer, 1849) †
- Species Neithea dutrugei (Coquand, 1862) †
- Species Neithea fleuriausiana (A. d'Orbigny, 1847) †
- Species Neithea georgetownensis Kniker, 1919 †
- Species Neithea gibbosa (Pulteney, 1813) †
- Species Neithea grandicosta Gabb, 1869 †
- Species Neithea grangei (Murdoch, 1924) †
- Species Neithea hanourensis Tashiro & Kozai, 1986 †
- Species Neithea hartmani Kniker, 1919 †
- Species Neithea hispanica (A. d'Orbigny, 1850) †
- Species Neithea irinae Bogdanova, 1993 †
- Species Neithea irregularis (Böse, 1910) †
- Species Neithea kochiensis Hayami, 1967 †
- Species Neithea kopetdaghensis Bogdanova, 1993 †
- Species Neithea kotsubu Kimura, 1951 † accepted as Aequipecten kotsubu (Kimura, 1951) †
- Species Neithea laevigata Drouet, 1824 † accepted as Neithea aequicostata (Lamarck, 1819) †
- Species Neithea manzonii T. Fuchs, 1881 † accepted as Pecten subarcuatus fuchsi Fontannes, 1878 †
- Species Neithea matsumotoi Hayami, 1965 †
- Species Neithea mexicana Jaworski, 1929 † accepted as Weyla alata (Buch, 1838) †
- Species Neithea moutai Rennie, 1945 † accepted as Neithea hispanica (A. d'Orbigny, 1850) †
- Species Neithea neocomiensis (A. d'Orbigny, 1847) †
- Species Neithea nipponica Hayami, 1965 †
- Species Neithea occidentalis Conrad, 1855 † accepted as Neithea alpina (A. d'Orbigny, 1847) †
- Species Neithea pectinoides Drouet, 1824 † accepted as Neithea aequicostata (Lamarck, 1819) †
- Species Neithea philippsoni J. Böhm, 1927 † accepted as Neithea striatocostata (Goldfuss, 1833) †
- Species Neithea pseudobellula Chiplonkar & Tapaswi, 1975 †
- Species Neithea quadricostata (J. Sowerby, 1814) † accepted as Neithea gibbosa (Pulteney, 1813) †
- Subspecies Neithea quadricostata lastroensis Maury, 1937 † accepted as Neithea coquandi (A. Péron, 1877) †
- Subspecies Neithea quadricostata regoi Maury, 1937 † accepted as Neithea coquandi (A. Péron, 1877) †
- Species Neithea quinquecostata (J. Sowerby, 1814) †
- Species Neithea regularis (Schlotheim, 1813) †
- Species Neithea roemeri (R. T. Hill, 1889) †
- Species Neithea salinasensis Rennie, 1945 † accepted as Neithea hispanica (A. d'Orbigny, 1850) †
- Species Neithea sergipensis C. A. White, 1887 † accepted as Neithea hispanica (A. d'Orbigny, 1850) †
- Species Neithea sexangularis (A. d'Orbigny, 1847) †
- Species Neithea sexcostata (S. Woodward, 1833) †
- Species Neithea simbirskensis (A. d'Orbigny, 1845) † accepted as Neithea sexcostata (S. Woodward, 1833) †
- Species Neithea simbirskiensis [sic] † accepted as Neithea sexcostata (S. Woodward, 1833) †
- Species Neithea simondsi Kniker, 1919 †
- Species Neithea simplex Mordvilko, 1966 †
- Species Neithea stefanoi (Choffat, 1900) †
- Species Neithea striatocostata (Goldfuss, 1833) †
- Species Neithea subalpina (Böse, 1910) †
- Species Neithea subsimplex Bogdanova & Yanin, 1995 †
- Species Neithea syriaca (Conrad, 1852) †
- Species Neithea texana (C. F. Roemer, 1852) †
- Species Neithea theodori Kniker, 1919 †
- Species Neithea valangiensis (F.-J. Pictet & Campiche, 1870) †
- Species Neithea vicinalis Stoyanow, 1949 †
- Species Neithea welwitschi (Choffat, 1888) † accepted as Neithea coquandi (A. Péron, 1877) †
- Species Neithea whitneyi Kniker, 1919 †
- Species Neithea wrighti [sic] † accepted as Neithella wrightii (Shumard, 1860) †
- Species Neithea youngi Myers, 1968 †
- Species Neithea zitteli (Pirona, 1884) †
- Family Pectinidae Rafinesque, 1815 (1 724)
- Family Pectinoidea incertae sedis (2)
- Family Pleuronectitidae Hautmann, 2011 † (13)
- Family Propeamussidae [sic] accepted as Propeamussiidae Abbott, 1954
- Family Propeamussiidae Abbott, 1954 (256)
- 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 (57)
- 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 (1 379)
- Infraclass Cryptodonta † (342)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 041)
- 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 (754)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata