Between brackets is the number of accepted species

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- Mollusca (132 754)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 992)
- Subclass Autobranchia (23 278)
- Infraclass Heteroconchia (16 634)
- Infraclass Pteriomorphia (6 644)
- Superorder Eupteriomorphia
- Order Arcida (1 225)
- Order Colpomyida † (6)
- Order Cyrtodontida † (66)
- Order Limida (351)
- Order Myalinida † (576)
- Order Mytilida (707)
- Order Ostreida (705)
- Order Pectinida (2 998)
- Superfamily Anomiacea accepted as Anomioidea Rafinesque, 1815
- Superfamily Anomioidea Rafinesque, 1815 (73)
- Superfamily Aviculopectinoidea Meek & Hayden, 1865 † (97)
- 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 † (9)
- 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)
- Subfamily Adamussiinae T. Habe, 1977 accepted as Adamussiini T. Habe, 1977
- Subfamily Aequipectininae F. Nordsieck, 1969 accepted as Aequipectinini F. Nordsieck, 1969
- Subfamily Camptonectinae Habe, 1977 (121)
- Subfamily Concentrichlamydinae Romanov, 1985 † accepted as Chlamydini Teppner, 1922
- Subfamily Fortipectininae K. Masuda, 1963 accepted as Fortipectinini K. Masuda, 1963
- Subfamily Hemipectinae T. Habe, 1977 accepted as Chlamydini Teppner, 1922
- Subfamily Hemipectininae T. Habe, 1977 accepted as Chlamydini Teppner, 1922
- Subfamily Hinnitinae Habe, 1977 accepted as Pedinae Bronn, 1862
- Subfamily Macrochlamydinae Kasum-Zade, 2003 accepted as Chlamydini Teppner, 1922
- Subfamily Mclearniinae Shurygin & Lutikov, 1991 † (7)
- Subfamily Palliolinae Korobkov, 1960 (128)
- Subfamily Pectinidae incertae sedis (2)
- Subfamily Pectininae Rafinesque, 1815 (632)
- Tribe Aequipectinini F. Nordsieck, 1969 (253)
- Genus Aequipecten P. Fischer, 1886 (92)
- Genus Argopecten Monterosato, 1889 (49)
- Genus Carolinapecten Ward & Blackwelder, 1987 † (6)
- Genus Chagrepecten T. R. Waller, 2011 † (3)
- Genus Chesapecten Ward & Blackwelder, 1975 † (15)
- Genus Cryptopecten Dall, Bartsch & Rehder, 1938 (10)
- Genus Flexopecten Sacco, 1897 (12)
- Genus Gurabopecten T. R. Waller, 2011 † (1)
- Genus Haumea Dall, Bartsch & Rehder, 1938 (3)
- Genus Iemanjavola Santelli, Del Río, Távora & M. I. F. Ramos, 2024 † (1)
- Genus Leptopecten A. E. Verrill, 1897 (33)
- Genus Lindapecten Petuch, 1995 (13)
- Genus Lissopecten Verrill, 1897 accepted as Flexopecten Sacco, 1897
- Genus Paraleptopecten T. R. Waller, 2011 accepted as Leptopecten A. E. Verrill, 1897
- Genus Perapecten H. P. Wagner, 1985 (4)
- Genus Serratovola T. Habe, 1951 (4)
- Genus Volachlamys Iredale, 1939 (7)
- Tribe Amusiini Ridewood, 1903 (91)
- Tribe Austrochlamydini Jonkers, 2003 (4)
- Tribe Decatopectinini T. R. Waller, 1986 (99)
- Tribe Pectinini Rafinesque, 1815 (183)
- Genus Velata Quenstedt, 1856 † (2)
- Subfamily Pedinae Bronn, 1862 (548)
- Subfamily Pseudopectininae Kasum-Zade, 2003 † (10)
- Subfamily Radulopectininae Romanov, 1985 † accepted as Chlamydini Teppner, 1922
- Subfamily Weylinae Kasum-Zade, 2003 † (12)
- Genus Agerchlamys S. E. Damborenea, 1993 † (5)
- Genus Agropecten [sic] accepted as Argopecten Monterosato, 1889
- Genus Amussiopecten Sacco, 1897 † (18)
- Genus Amussiopsis Andreeva, 1966 † accepted as Parvamussium Sacco, 1897
- Genus Amussium Herrmannsen, 1846 accepted as Amusium Röding, 1798 (1)
- Genus Anatipopecten Hertlein, 1936 † (2)
- Genus Anradulonectites Shurygin & Lutikov, 1991 † (6)
- Genus Antipecten Cossmann, 1914 † (2)
- Genus Antipectenoides X.-C. Li & Grant-Mackie, 1994 † (1)
- Genus Argoderma Poli, 1795 accepted as Pecten O. F. Müller, 1776
- Genus Argus Poli, 1791 accepted as Pecten O. F. Müller, 1776
- Genus Avichlamys Allasinaz, 1972 † (9)
- Genus Batequeus Squires & Demetrion, 1990 † (2)
- Genus Belchlamys Iredale, 1929 accepted as Semipallium Jousseaume, 1928
- Genus Bosniopecten Kasum-Zade, 2003 † (4)
- Genus Canadonectites Aberhan, 1998 † (1)
- Genus Capedopecten Dijkstra & A.W. Janssen, 1988 † (1)
- Genus Christinapecten Ward, 1992 † (1)
- Genus Clamys [sic] accepted as Chlamys Röding, 1798
- Genus Comptopallium Iredale, 1939 accepted as Decatopecten G. B. Sowerby II, 1839
- Genus Corymbichlamys Iredale, 1939 accepted as Cryptopecten Dall, Bartsch & Rehder, 1938
- Genus Costellamussiopecten Bongrain, Cahuzac & Freneix, 1994 † (19)
- Genus Crassedoma accepted as Crassadoma F. R. Bernard, 1986
- Genus Crassodoma accepted as Crassadoma F. R. Bernard, 1986
- Genus Crenamussium C. R. Newton, 1987 † (1)
- Genus Cristatopecten Bongrain & Cahuzac, 2004 † accepted as Costellamussiopecten Bongrain, Cahuzac & Freneix, 1994 †
- Genus Decadopecten [sic] accepted as Decatopecten G. B. Sowerby II, 1839
- Genus Dendopecten Hertlein, 1936 † accepted as Mesopeplum Iredale, 1929
- Genus Deperetia Teppner, 1922 accepted as Pecten O. F. Müller, 1776
- Genus Dhondtichlamys T. R. Waller, 2001 † (14)
- Genus Dimarzipecten Ward, 1992 † (3)
- Genus Eopecten Douvillé, 1897 † (11)
- Genus Euthymipecten Dhondt & Dieni, 1988 † (2)
- Genus Exellichlamys [sic] accepted as Excellichlamys Iredale, 1939
- Genus Flabellipecten Sacco, 1897 accepted as Pecten O. F. Müller, 1776
- Genus Giraliapecten Darragh & Kendrick, 1991 † (1)
- Genus Glabropecten Sacco, 1897 accepted as Flexopecten Sacco, 1897
- Genus Gloriapallium [sic] accepted as Gloripallium Iredale, 1939
- Genus Grandinectes Fürsich & H.-Z. Pan, 2014 † accepted as Camptonectes (Grandinectes) Fürsich & H.-Z. Pan, 2014 †
- Genus Grandipecten Cossmann, 1914 † accepted as Gigantopecten Rovereto, 1899 †
- Genus Granulochlamys Allasinaz, 1972 † (6)
- Genus Heritschia Teppner, 1922 accepted as Pecten O. F. Müller, 1776
- Genus Hilberia Teppner, 1922 † (10)
- Genus Hinnita accepted as Hinnites Defrance, 1821
- Genus Hunanonectes Z.-J. Fang, 1978 † (1)
- Genus Inaequipecten Ugolini, 1906 † accepted as Gigantopecten Rovereto, 1899 †
- Genus Indigiropecten Trushchelev, 1984 † accepted as Tosapecten (Indigiropecten) Trushchelev, 1984 †
- Genus Indopecten Douglas, 1929 † (17)
- Genus Indoweyla Fürsich & Heinze, 1995 † (3)
- Genus Interchlamys T. R. Waller, 2011 † (5)
- Genus Iranopecten Repin, 2001 † accepted as Indopecten Douglas, 1929 †
- Genus Janira Schumacher, 1817 accepted as Pecten O. F. Müller, 1776
- Genus Janopecten Arkhipov & Trushchelev, 1980 † (9)
- Genus Jaworskia Teppner, 1922 accepted as Pecten O. F. Müller, 1776
- Genus Jorgechlamys del Río, 2004 † (2)
- Genus Kenkerenochlamys Bychkov, 2007 † (1)
- Genus Kolymonectes Milova & Polubotko, 1976 † (7)
- Genus Korobkovia Glibert & van de Poel, 1965 † (3)
- Genus Lepidopecten Woodring, 1982 † (2)
- Genus Lituyapecten MacNeil, 1961 † (7)
- Genus Loxochlamys T. R. Waller, 2005 † (3)
- Genus Lyriochlamys Sobetski, 1977 † (10)
- Genus Macrochlamis Sacco, 1897 † accepted as Macrochlamys Sacco, 1897 †
- Genus Macrochlamys Sacco, 1897 † accepted as Gigantopecten Rovereto, 1899 †
- Genus Microchlamys Sobetski, 1977 † accepted as Dhondtichlamys T. R. Waller, 2001 †
- Genus Micronectes Ichikawa & Maeda, 1958 † (1)
- Genus Minervapecten Romanov, 1985 † (2)
- Genus Mixtipecten Marwick, 1928 † (1)
- Genus Nanaochlamys Hatai & Masuda, 1953 † (4)
- Genus Neithella Hayami, 1965 † (2)
- Genus Nippononectes Tashiro, 1982 † (4)
- Genus Nomurachlamys Kurihara & Matsubara, 2010 † accepted as Chlamys (Nomurachlamys) Kurihara & Matsubara, 2010 †
- Genus Notovola Finlay, 1926 accepted as Pecten O. F. Müller, 1776
- Genus Ochotochlamys Milova & Polubotko, 1976 † (9)
- Genus Pacipecten Olsson, 1961 accepted as Leptopecten A. E. Verrill, 1897
- Genus Palliorum [sic] accepted as Palliolum Monterosato, 1884
- Genus Pallium Schröter, 1802 accepted as Pecten O. F. Müller, 1776
- Genus Pamiropecten Romanov, 1985 † (10)
- Genus Parapecten Crickmay, 1930 † accepted as Weyla J. Böhm, 1920 †
- Genus Pectinites Schlotheim, 1813 † accepted as Pecten O. F. Müller, 1776
- Genus Pectinium Link, 1807 accepted as Pecten O. F. Müller, 1776
- Genus Pectinula A. F. Leanza, 1943 † accepted as Posidonotis Losacco, 1942 †
- Genus Peduminae T. Habe, 1977 accepted as Pedinae Bronn, 1862
- Genus Peplum Bucquoy, Dautzenberg & Dollfus, 1889 accepted as Pseudamussium Mörch, 1853
- Genus Periclaraia J.-H. Li & B.-L. Ding, 1981 † (2)
- Genus Pernipecten Girty, 1904 † accepted as Pernopecten Winchell, 1865 †
- Genus Pethopecten Hertlein, 1936 † (1)
- Genus Phallium [sic] accepted as Pallium Schröter, 1802
- Genus Philippia Teppner, 1922 accepted as Pecten O. F. Müller, 1776
- Genus Plagioctenium Dall, 1898 accepted as Argopecten Monterosato, 1889
- Genus Platipecten Monterosato, 1899 accepted as Pseudamussium Mörch, 1853
- Genus Pleuronectia Swainson, 1840 accepted as Amusium Röding, 1798
- Genus Prohinnites Gillet, 1922 † (8)
- Genus Protamusium A. E. Verrill, 1897 † accepted as Entolium Meek, 1865 †
- Genus Proteopecten Monterosato, 1899 accepted as Flexopecten Sacco, 1897
- Genus Pseudamusium [sic] accepted as Pseudamussium Mörch, 1853
- Genus Psychrochlamys Jonkers, 2003 accepted as Zygochlamys Ihering, 1907
- Genus Radiopecten Stephenson, 1941 † (2)
- Genus Rebeccapecten Ward, 1992 † (2)
- Genus Reticulochlamys del Río, 2004 † (3)
- Genus Semipecten P. Fischer, 1886 accepted as Hemipecten A. Adams & Reeve, 1849
- Genus Sigmaringenopecten Kasum-Zade, 2003 † (1)
- Genus Sinectenolium Eames & L. R. Cox, 1956 † accepted as Decatopecten (Sinectenolium) Eames & L. R. Cox, 1956 †
- Genus Somalipecten T. R. Waller, 1986 accepted as Mirapecten Dall, Bartsch & Rehder, 1938
- Genus Stralopecten Tucker-Rowland, 1938 † (3)
- Genus Striatoamussium Aberhan, 1998 † accepted as Propeamussium (Striatoamussium) Aberhan, 1998 †
- Genus Tuguronectes Sey, 1992 † (1)
- Genus Varientolium Andreeva, 1966 † (1)
- Genus Velatopecten [sic] † accepted as Velopecten E. Philippi, 1899 †
- Genus Velopecten E. Philippi, 1899 † accepted as Velata Quenstedt, 1856 †
- Genus Venilia A. Adams & Reeve, 1848 accepted as Hemipecten A. Adams & Reeve, 1849
- Genus Vertipecten U. S. Grant & Gale, 1931 † (12)
- Genus Vola Mörch, 1853 accepted as Pecten O. F. Müller, 1776 (1)
- Genus Zamorapecten T. R. Waller, 2011 † (2)
- 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 (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 (1 832)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 679)
- 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