Between brackets is the number of accepted species

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- Mollusca (133 306)
- 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)
- Superfamily Arcacea accepted as Arcoidea Lamarck, 1809
- Superfamily Arcida incertae sedis (1)
- Superfamily Arcoidea Lamarck, 1809 (914)
- Family Arcidae Lamarck, 1809 (505)
- Subfamily Anadarinae Reinhart, 1935 represented as Arcidae Lamarck, 1809
- Subfamily Arcinae Lamarck, 1809 represented as Arcidae Lamarck, 1809
- Subfamily Bathyarcinae Scarlato & Starobogatov, 1979 represented as Arcidae Lamarck, 1809
- Subfamily Litharcinae Frizzell, 1946 represented as Arcidae Lamarck, 1809
- Subfamily Scaphulinae Scarlato & Starobogatov, 1979 represented as Arcidae Lamarck, 1809
- Genus Abarbatia Dall, Bartsch & Rehder, 1938 accepted as Barbatia J. E. Gray, 1842
- Genus Acar J. E. Gray, 1857 (41)
- Genus Ambrogia Malatesta, 1974 † (1)
- Genus Anadara J. E. Gray, 1847 (138)
- Genus Anomalocardia Mörch, 1853 accepted as Tegillarca Iredale, 1939
- Genus Arca Linnaeus, 1758 (68)
- Genus Argina J. E. Gray, 1842 accepted as Lunarca J. E. Gray, 1842
- Genus Arginarca R. A. McLean, 1951 accepted as Lunarca J. E. Gray, 1842
- Genus Asperarca Sacco, 1898 (5)
- Genus Austrocucullaea Zinsmeister, 1988 † (1)
- Genus Barbatia J. E. Gray, 1842 (95)
- Genus Barbatirus Iredale, 1939 accepted as Barbatia J. E. Gray, 1842
- Genus Bathyarca Kobelt, 1891 (34)
- Genus Bentharca A. E. Verrill & K. J. Bush, 1898 (12)
- Genus Byssoarca Swainson, 1833 accepted as Arca Linnaeus, 1758
- Genus Calloarca J. E. Gray, 1857 (10)
- Genus Caloosarca Olsson, 1961 accepted as Anadara J. E. Gray, 1847
- Genus Cara J. E. Gray, 1857 accepted as Anadara J. E. Gray, 1847
- Genus Carbonarca Meek & Worthen, 1870 †
- Genus Cibota Mörch, 1853 accepted as Arca Linnaeus, 1758
- Species Cibota mississippiensis Gabb, 1860 †
- Species Cibota multiradiata Gabb, 1860 †
- Genus Coraliarca Habe & Okutani, 1968 accepted as Calloarca J. E. Gray, 1857
- Genus Cucullaearca Conrad, 1865 (2)
- Genus Cunearca Dall, 1898 accepted as Anadara (Cunearca) Dall, 1898
- Genus Daphnoderma Poli, 1795 accepted as Arca Linnaeus, 1758
- Genus Deltaodon Barnard, 1962 (2)
- Genus Destacar Iredale, 1936 (1)
- Genus Diluvarca Woodring, 1925 accepted as Anadara (Diluvarca) Woodring, 1925 †
- Genus Eonavicula Arkell, 1929 † accepted as Arca (Eonavicula) Arkell, 1929 †
- Genus Epitrisis Iredale, 1939 accepted as Trisidos Röding, 1798
- Genus Esmerarca Olsson, 1961 accepted as Anadara J. E. Gray, 1847
- Genus Fossularca Cossmann, 1887 † accepted as Arcopsis Koenen, 1885
- Genus Fugleria Reinhart, 1937 (3)
- Genus Grandiarca Olsson, 1961 accepted as Larkinia Reinhart, 1935
- Genus Granoarca Conrad, 1862 † accepted as Barbatia J. E. Gray, 1842
- Genus Hawaiarca Dall, Bartsch & Rehder, 1938 (8)
- Genus Imparilarca Iredale, 1929 accepted as Anadara (Imparilarca) Iredale, 1929
- Genus Indacar Iredale, 1939 accepted as Bentharca A. E. Verrill & K. J. Bush, 1898
- Genus Indarca Borkar, Kulkarni & Bhattacharjee-Kapoor, 2014 † (2)
- Genus Indogrammatodon L. R. Cox, 1937 † (10)
- Genus Kikaiarca H. Noda, 1966 † accepted as Anadara (Imparilarca) Iredale, 1929
- Genus Lamarcka Vermeij & Amano, 2021 (12)
- Genus Larkinia Reinhart, 1935 (2)
- Genus Litharca Gray, 1842 (1)
- Genus Lunarca J. E. Gray, 1842 (3)
- Genus Mabellarca Iredale, 1939 (1)
- Genus Mesocibota Iredale, 1939 (3)
- Genus Microcucullaea Iredale, 1929 accepted as Bathyarca Kobelt, 1891
- Genus Mimarcaria Iredale, 1939 (5)
- Genus Miratacar Iredale, 1939 (1)
- Genus Mosambicarca Lutaenko, 1994 (2)
- Genus Navicula Blainville, 1825 accepted as Arca Linnaeus, 1758
- Genus Nipponarca Habe, 1951 accepted as Mesocibota Iredale, 1939
- Genus Notogrammatodon P. A. Maxwell, 1966 † accepted as Bentharca A. E. Verrill & K. J. Bush, 1898
- Genus Okinawanoarca H. Noda, 1980 † accepted as Bentharca A. E. Verrill & K. J. Bush, 1898
- Genus Opularca Iredale, 1939 accepted as Calloarca J. E. Gray, 1857
- Genus Paragrammatodon Nomura & Niino, 1940 accepted as Samacar Iredale, 1936
- Genus Parallelepipedum Mörch, 1850 accepted as Trisidos Röding, 1798
- Genus Parallepipedum Jousseaume, 1888 accepted as Trisidos Röding, 1798
- Genus Paranadara Francisco, J. Barros & S. Lima, 2012 (1)
- Genus Potiarca Iredale, 1939 accepted as Anadara (Potiarca) Iredale, 1939
- Genus Pseudoporterius Kamenev, 2007 accepted as Samacar Iredale, 1936
- Genus Pugilarca Marwick, 1928 † (1)
- Genus Rasia J. E. Gray, 1857 accepted as Anadara J. E. Gray, 1847
- Genus Rostarca Glibert & van de Poel, 1965 † (6)
- Genus Samacar Iredale, 1936 (3)
- Genus Savignyarca Jousseaume, 1891 accepted as Barbatia J. E. Gray, 1842
- Genus Scapharca J. E. Gray, 1847 accepted as Anadara (Scapharca) J. E. Gray, 1847
- Genus Scapharcopsis F. Nordsieck, 1969 accepted as Anadara (Diluvarca) Woodring, 1925 †
- Genus Scaphula W. H. Benson, 1834 (5)
- Genus Sectiarca Olsson, 1961 accepted as Anadara J. E. Gray, 1847
- Genus Senilia Gray, 1842 (1)
- Genus Soldania De Stefani & Pantanelli, 1878 † accepted as Ambrogia Malatesta, 1974 †
- Genus Tegillarca Iredale, 1939 (11)
- Genus Tetrarca F. Nordsieck, 1969 (4)
- Genus Thronacar Iredale, 1939 accepted as Bathyarca Kobelt, 1891
- Genus Tosarca H. Noda, 1965 † accepted as Anadara (Tosarca) H. Noda, 1965
- Genus Trigonarca Conrad, 1862 † (1)
- Genus Trigonoarca [sic] † accepted as Trigonarca Conrad, 1862 †
- Genus Trisidos Röding, 1798 (5)
- Genus Trisis Blainville, 1825 accepted as Trisidos Röding, 1798
- Genus Ustularca Iredale, 1939 accepted as Barbatia J. E. Gray, 1842
- Genus Vitracar Iredale, 1939 accepted as Hawaiarca Dall, Bartsch & Rehder, 1938
- Genus Xenophorarca M. Huber, 2010 (4)
- Family Catamarcaiidae Cope, 2000 † (1)
- Family Cucullaeidae R. B. Stewart, 1930 (46)
- Family Frejidae Ratter & Cope, 1998 † (2)
- Family Glycymeridae [sic] accepted as Glycymerididae Dall, 1908 (1847)
- Family Glycymerididae Dall, 1908 (1847) (221)
- Family Noetiidae R. B. Stewart, 1930 (91)
- Family Parallelodontidae Dall, 1898 (48)
- Family Pectunculidae Leach, 1847 accepted as Glycymerididae Dall, 1908 (1847)
- Superfamily Glyptarcoidea J. C. W. Cope, 1996 † (11)
- Superfamily Limopsacea accepted as Limopsoidea Dall, 1895
- Superfamily Limopsoidea Dall, 1895 (301)
- Order Colpomyida † (6)
- Order Cyrtodontida † (67)
- Order Limida (359)
- Order Myalinida † (577)
- Order Mytilida (709)
- Order Ostreida (713)
- Order Pectinida (3 008)
- 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 (1 921)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 047)
- 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