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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)
- Infraclass Heteroconchia (16 637)
- Subterclass Archiheterodonta (1 208)
- Subterclass Euheterodonta (11 356)
- Superorder Anomalodesmata (987)
- Superorder Imparidentia (10 336)
- Order Adapedonta (260)
- Order Cardiida (3 055)
- Order Galeommatida (791)
- Order Gastrochaenida (43)
- Order Hiatellida represented as Adapedonta
- Order Hippuritida † (321)
- Order Lucinida (997)
- Order Megalodontida † (141)
- Order Modiomorphida † (94)
- Order Myacea accepted as Myida
- Order Myida (924)
- Order Sphaeriida (662)
- Superfamily Sphaerioidea Deshayes, 1855 (1820) (662)
- Family Corneocycladidae Hannibal, 1912 accepted as Sphaeriidae Deshayes, 1855 (1820)
- Family Euglesidae Pirogov & Starobogatov, 1974 accepted as Sphaeriinae Deshayes, 1855 (1820)
- Family Kijidae C. M. Kolesnikov, 1977 † (21)
- Family Limnocyrenidae C. M. Kolesnikov, 1977 † (39)
- Family Neomiodontidae R. Casey, 1955 † (122)
- Family Pisidiidae Gray, 1857 accepted as Sphaeriidae Deshayes, 1855 (1820)
- Family Sibireconchidae C. M. Kolesnikov, 1977 † (3)
- Family Sphaeriidae Deshayes, 1855 (1820) (477)
- Subfamily Euglesinae Pirogov & Starobogatov, 1974 accepted as Sphaeriinae Deshayes, 1855 (1820)
- Subfamily Euperinae Heard, 1965 (43)
- Subfamily Lacustrininae Korniushin, 1989 accepted as Sphaeriinae Deshayes, 1855 (1820)
- Subfamily Musculiinae Starobogatov, 1984 accepted as Sphaeriidae Deshayes, 1855 (1820)
- Subfamily Neopisidiinae Korniushin, 1989 accepted as Sphaeriinae Deshayes, 1855 (1820)
- Subfamily Pisidiinae Gray, 1857 accepted as Sphaeriinae Deshayes, 1855 (1820)
- Subfamily Sphaeriinae Deshayes, 1855 (1820) (424)
- Tribe Sphaeriini Deshayes, 1855 (1820) accepted as Sphaeriinae Deshayes, 1855 (1820)
- Genus Afropisidium Kuiper, 1962 accepted as Euglesa (Afropisidium) Kuiper, 1962
- Genus Amesodon Agassiz, 1846 accepted as Sphaerium Scopoli, 1777
- Genus Amniciana Servain, 1888 accepted as Pisidium C. Pfeiffer, 1821
- Genus Calyculina Clessin, 1872 accepted as Musculium Link, 1807
- Genus Cingulipisidium Pirogov & Starobogatov, 1974 accepted as Euglesa (Cingulipisidium) Pirogov & Starobogatov, 1974
- Genus Clessinia Piaget, 1913 accepted as Euglesa Jenyns, 1832
- Genus Clessinicyclas Alimov & Starobogatov, 1968 accepted as Sphaerium Scopoli, 1777
- Genus Conventus Pirogov & Starobogatov, 1974 (5)
- Genus Cornea Megerle von Mühlfeld, 1811 accepted as Sphaerium Scopoli, 1777
- Genus Corneocyclas J. B. Férussac, 1818 accepted as Sphaerium Scopoli, 1777
- Genus Corneola Westerlund, 1873 accepted as Sphaerium Scopoli, 1777
- Genus Cycladea Rafinesque, 1815 accepted as Sphaerium Scopoli, 1777
- Genus Cycladites Krüger, 1823 accepted as Sphaerium Scopoli, 1777
- Genus Cyclas Lamarck, 1798 accepted as Sphaerium Scopoli, 1777
- Genus Cyclocalyx Dall, 1903 accepted as Euglesa (Euglesa) Jenyns, 1832
- Genus Cyclus Jurine, 1817 accepted as Sphaerium Scopoli, 1777
- Genus Cymatocyclas Dall, 1903 accepted as Euglesa Jenyns, 1832
- Genus Euglesa Jenyns, 1832 (90)
- Subgenus Euglesa (Afropisidium) Kuiper, 1962 represented as Euglesa Jenyns, 1832
- Species Euglesa (Afropisidium) aslini (Kuiper, 1983) represented as Euglesa aslini (Kuiper, 1983)
- Species Euglesa (Afropisidium) chandanbariensis (Nesemann, D. N. Shah & Tachamo, 2007) represented as Euglesa chandanbariensis (Nesemann, D. N. Shah & Tachamo, 2007)
- Species Euglesa (Afropisidium) chilensis (A. d'Orbigny, 1846) represented as Euglesa chilensis (A. d'Orbigny, 1846)
- Species Euglesa (Afropisidium) ethiopica (Korniushin, 1995) represented as Euglesa ethiopica (Korniushin, 1995)
- Species Euglesa (Afropisidium) giraudi (Bourguignat, 1885) represented as Euglesa giraudi (Bourguignat, 1885)
- Species Euglesa (Afropisidium) hodgkini (Suter, 1905) represented as Euglesa hodgkini (Suter, 1905)
- Species Euglesa (Afropisidium) keniana (Preston, 1911) represented as Euglesa keniana (Preston, 1911)
- Species Euglesa (Afropisidium) lepersonnei (Gautier & Van Damme, 1973) † represented as Euglesa lepersonnei (Gautier & Van Damme, 1973) †
- Species Euglesa (Afropisidium) pirothi (Jickeli, 1881) represented as Euglesa pirothi (Jickeli, 1881)
- Species Euglesa (Afropisidium) stoliczkana (Prashad, 1933) represented as Euglesa stoliczkana (Prashad, 1933)
- Species Euglesa (Afropisidium) sundana (B. Rensch, 1934) represented as Euglesa sundana (B. Rensch, 1934)
- Subgenus Euglesa (Amureuglesa) Korniushin, 1996 represented as Euglesa Jenyns, 1832
- Subgenus Euglesa (Arcteuglesa) Pirogov & Starobogatov, 1974 accepted as Euglesa (Henslowiana) Servain, 1888
- Subgenus Euglesa (Casertiana) Servain, 1888 represented as Euglesa Jenyns, 1832
- Subgenus Euglesa (Cingulipisidium) Pirogov & Starobogatov, 1974 represented as Euglesa Jenyns, 1832
- Subgenus Euglesa (Conventus) Pirogov & Starobogatov, 1974 accepted as Conventus Pirogov & Starobogatov, 1974
- Subgenus Euglesa (Costopisidium) Pirogov & Starobogatov, 1974 accepted as Euglesa Jenyns, 1832
- Subgenus Euglesa (Cyclocalyx) Dall, 1903 accepted as Euglesa Jenyns, 1832
- Subgenus Euglesa (Cymatocyclas) Dall, 1903 accepted as Euglesa Jenyns, 1832
- Subgenus Euglesa (Euglesa) Jenyns, 1832 represented as Euglesa Jenyns, 1832
- Subgenus Euglesa (Henslowiana) Servain, 1888 represented as Euglesa Jenyns, 1832
- Subgenus Euglesa (Hiberneuglesa) Starobogatov, 1983 represented as Euglesa Jenyns, 1832
- Subgenus Euglesa (Hinziana) Dolgin & Kornjushin, 1994 accepted as Euglesa (Hiberneuglesa) Starobogatov, 1983
- Subgenus Euglesa (Potamopisidium) Korniushin, 1991 accepted as Euglesa Jenyns, 1832
- Subgenus Euglesa (Pseudeupera) Germain, 1913 represented as Euglesa Jenyns, 1832
- Subgenus Euglesa (Pseudosphaerium) Korniushin, 1990 accepted as Euglesa (Cingulipisidium) Pirogov & Starobogatov, 1974
- Subgenus Euglesa (Pulchelleuglesa) Starobogatov, 1983 accepted as Euglesa Jenyns, 1832
- Subgenus Euglesa (Roseana) Fagot, 1892 accepted as Euglesa Jenyns, 1832
- Subgenus Euglesa (Tetragonocyclas) Pirogov & Starobogatov, 1974 accepted as Euglesa (Cingulipisidium) Pirogov & Starobogatov, 1974
- Species Euglesa adamsii (W. Stimpson, 1851)
- Species Euglesa aslini (Kuiper, 1983)
- Species Euglesa astrachanica Pirogov & Starobogatov, 1984 accepted as Euglesa subtruncata (Malm, 1855)
- Species Euglesa atkinsoniana (Theobald, 1876)
- Species Euglesa boessnecki (Albrecht & Clewing, 2022)
- Species Euglesa buchtarmensis Krivosheina, 1978 accepted as Euglesa casertana (Poli, 1791)
- Species Euglesa cara (Cotton, 1953)
- Species Euglesa casertana (Poli, 1791)
- Species Euglesa cavatica (Zhadin, 1952)
- Species Euglesa centralis (Korniushin, 2000)
- Species Euglesa chandanbariensis (Nesemann, D. N. Shah & Tachamo, 2007)
- Species Euglesa chankensis (I. M. Likharev, 1952)
- Species Euglesa chilensis (A. d'Orbigny, 1846)
- Species Euglesa clausi Korniushin, 2006
- Species Euglesa compressa (Prime, 1852)
- Species Euglesa conventus (Clessin, 1887) accepted as Conventus conventus (Clessin, 1877)
- Species Euglesa coreana (O.-K. Kwon, 1990)
- Species Euglesa costulosa (Connolly, 1931)
- Species Euglesa depressinitida V. Anistratenko & Starobogatov, 1991
- Species Euglesa difficilis Popova & Starobogatov, 1970 †
- Species Euglesa difficilis Pirogov & Starobogatov, 1975 accepted as Euglesa (Henslowiana) pirogovi Starobogatov, 1984
- Species Euglesa edlaueri (Kuiper, 1960)
- Species Euglesa eichwaldi Stadnichenko, 1983 accepted as Euglesa personata (Malm, 1855)
- Species Euglesa equilateralis (Prime, 1852)
- Species Euglesa etheridgei (E. A. Smith, 1882)
- Species Euglesa ethiopica (Korniushin, 1995)
- Species Euglesa fallax (Sterki, 1896)
- Species Euglesa ferruginea (Prime, 1852)
- Species Euglesa floresiana (B. Rensch, 1934)
- Species Euglesa fultoni (Kuiper, 1983)
- Species Euglesa giraudi (Bourguignat, 1885)
- Species Euglesa globularis (Clessin, 1873)
- Species Euglesa granum (Lindholm, 1909)
- Species Euglesa gurvichi Izzatullaev & Starobogatov, 1985
- Species Euglesa hallae (Kuiper, 1983)
- Species Euglesa harrisoni (Kuiper, 1964)
- Species Euglesa henslowana (Sheppard, 1825)
- Species Euglesa hibernica (Westerlund, 1894) accepted as Euglesa parvula (Westerlund, 1873)
- Species Euglesa hinzi (Kuiper, 1975)
- Species Euglesa hodgkini (Suter, 1905)
- Species Euglesa humerosa Pirogov & Starobogatov, 1975 accepted as Euglesa subtruncata (Malm, 1855)
- Species Euglesa interstitialis (Bössneck, Groh & Richling, 2020)
- Species Euglesa japonica (Pilsbry & Y. Hirase, 1908) accepted as Odhneripisidium japonicum (Pilsbry & Y. Hirase, 1908)
- Species Euglesa kawamurai (Mori, 1938)
- Species Euglesa keniana (Preston, 1911)
- Species Euglesa khurbaensis Zatravkin, 1987
- Species Euglesa kolymensis Bespalaya, Aksenova & Bolotov, 2023
- Species Euglesa korniushini Frolov, 2010
- Species Euglesa korotnevi (Lindholm, 1909)
- Species Euglesa kosciusko (Iredale, 1943)
- Species Euglesa kyrgyzica Bespalaya, Aksenova, Kondakov & Palatov, 2023
- Species Euglesa langleyana (Melvill & Ponsoby, 1891)
- Species Euglesa lepersonnei (Gautier & Van Damme, 1973) †
- Species Euglesa lilljeborgi (Clessin, 1886) accepted as Euglesa lilljeborgii (Clessin, 1886)
- Species Euglesa lilljeborgii (Clessin, 1886)
- Species Euglesa lindholmi (Starobogatov & Streletzkaja, 1967)
- Species Euglesa ljovuschkini (Starobogatov, 1962)
- Species Euglesa lyudmilae Frolov, 2010
- Species Euglesa maasseni (Kuiper, 1987)
- Species Euglesa milium (Held, 1836)
- Species Euglesa minuta (Kozhov, 1936)
- Species Euglesa mitchelli (Prashad, 1925)
- Species Euglesa mongolica Slugina & Starobogatov, 2001
- Species Euglesa moroccana Bespalaya, Vinarski, Aksenova, Mabrouki, Kondakov & Palatov, 2023
- Species Euglesa nipponensis (Kuroda, 1930)
- Species Euglesa nitida (Jenyns, 1832)
- Species Euglesa nordenskioldi (Clessin, 1876)
- Species Euglesa novaezelandiae (Prime, 1862)
- Species Euglesa obliquata (Clessin, 1874) accepted as Euglesa casertana (Poli, 1791)
- Species Euglesa obtusalis (Lamarck, 1818)
- Species Euglesa ovampica (Ancey, 1890)
- Species Euglesa paludosa (T. Hutton, 1849)
- Species Euglesa parvula (Westerlund, 1873)
- Species Euglesa peipsi Timm, 1976
- Species Euglesa personata (Malm, 1855)
- Species Euglesa pirothi (Jickeli, 1881)
- Species Euglesa platyvalva Slugina & Starobogatov, 1994
- Species Euglesa ponderi (Korniushin, 2000)
- Species Euglesa ponderosa (Stelfox, 1918)
- Species Euglesa pseudosphaerium (Ehrmann, 1933)
- Species Euglesa pulchella (Jenyns, 1832)
- Species Euglesa pusilla (W. Turton, 1819) accepted as Euglesa personata (Malm, 1855)
- Species Euglesa raddei (W. Dybowski, 1902) accepted as Conventus raddei (W. Dybowski, 1902)
- Species Euglesa rotundata (Prime, 1852)
- Species Euglesa ruut Timm, 1975 accepted as Euglesa lilljeborgii (Clessin, 1886)
- Species Euglesa sarmatica V. Anistratenko, 1991 †
- Species Euglesa semenkevitschi (Lindholm, 1909)
- Species Euglesa shcherbinai Frolov, 2010
- Species Euglesa stoliczkana (Prashad, 1933)
- Species Euglesa subconventus (Starobogatov & Streletzkaja, 1967) accepted as Conventus subconventus (Starobogatov & Streletzkaja, 1967)
- Species Euglesa subgranum Slugina & Starobogatov, 1994
- Species Euglesa subponderosa Krivosheina, 1976
- Species Euglesa subterranea (Zhadin, 1932)
- Species Euglesa subtruncata (Malm, 1855)
- Species Euglesa sundana (B. Rensch, 1934)
- Species Euglesa supina (A. Schmidt, 1851)
- Species Euglesa tanuga Timm, 1976 accepted as Euglesa nitida (Jenyns, 1832)
- Species Euglesa tasmanica (Tenison Woods, 1876)
- Species Euglesa tenuisculpta Pirogov & Starobogatov, 1975 accepted as Euglesa subtruncata (Malm, 1855)
- Species Euglesa trigonoides (W. Dybowski, 1902)
- Species Euglesa turkestanica Izzatullaev, 1974
- Species Euglesa ultramontana (Prime, 1865)
- Species Euglesa urinator (Clessin, 1877) accepted as Conventus conventus (Clessin, 1877)
- Species Euglesa variabilis (Prime, 1852)
- Species Euglesa ventricosa (Prime, 1851)
- Species Euglesa viridaria (Kuiper, 1956)
- Species Euglesa volgensis Pirogov & Starobogatov, 1975 accepted as Euglesa subtruncata (Malm, 1855)
- Species Euglesa waldeni (Kuiper, 1975)
- Species Euglesa walkeri (Sterki, 1895)
- Species Euglesa zugmayeri (A. Weber, 1910)
- Genus Galileja O. G. Costa, 1840 accepted as Euglesa Jenyns, 1832
- Genus Henslowiana Servain, 1888 accepted as Euglesa (Henslowiana) Servain, 1888
- Genus Hiberneuglesa Starobogatov, 1983 accepted as Euglesa (Hiberneuglesa) Starobogatov, 1983
- Genus Hindupisidium Vinarski & Bespalaya, 2023 (3)
- Genus Lacustrina Sterki, 1916 accepted as Pisidium (Lacustrina) Sterki, 1916
- Genus Limosina Clessin, 1872 accepted as Eupera Bourguignat, 1854
- Genus Musculium Link, 1807 accepted as Sphaerium (Musculium) Link, 1807
- Genus Neopisidium Odhner, 1921 accepted as Pisidium (Neopisidium) Odhner, 1921
- Genus Nucleocyclas Alimov & Starobogatov, 1968 accepted as Sphaerium Scopoli, 1777
- Genus Nux Humphrey, 1797 accepted as Sphaerium Scopoli, 1777
- Genus Odhneripisidium Kuiper, 1962 (36)
- Genus Paramusculium Alimov & Starobogatov, 1968 accepted as Sphaerium (Musculium) Link, 1807
- Genus Parasphaerium Alimov & Starobogatov, 1968
- Genus Phymesoda Rafinesque, 1820 accepted as Musculium Link, 1807
- Genus Pisidium C. Pfeiffer, 1821 (108)
- Genus Primella Cooper, 1892 accepted as Sphaerium Scopoli, 1777
- Genus Pseudeupera Germain, 1913 accepted as Euglesa (Pseudeupera) Germain, 1913
- Genus Pseudocorbicula Dautzenberg, 1908 accepted as Sphaerium Scopoli, 1777
- Genus Rivicoliana Servain, 1888 accepted as Sphaerium (Amesoda) Rafinesque, 1820
- Genus Roseana Fagot, 1892 accepted as Euglesa (Casertiana) Servain, 1888
- Genus Shadinicyclas Starobogatov & Korniushin, 1986 accepted as Sphaerium (Amesoda) Rafinesque, 1820
- Genus Sphaeriastrum Bourguignat, 1854 accepted as Sphaerium Scopoli, 1777
- Genus Sphaerium Scopoli, 1777 (182)
- Genus Tetragonocyclas Pirogov & Starobogatov, 1974 accepted as Euglesa (Cingulipisidium) Pirogov & Starobogatov, 1974
- Genus Zecyclas Starobogatov, 1968 accepted as Sphaerium (Sphaerinova) Iredale, 1943
- Tribe Euglesini Pirogov & Starobogatov, 1974 accepted as Sphaeriinae Deshayes, 1855 (1820)
- Genus Amesoda Rafinesque, 1820 accepted as Sphaerium (Amesoda) Rafinesque, 1820
- Genus Cordula Leach, 1852 accepted as Pisidium C. Pfeiffer, 1821
- Genus Megasphaerioides Komatsu, J.-H. Chen & Q.-F. Wang, 2003 † (1)
- Genus Pera Leach, 1831 accepted as Pisidium C. Pfeiffer, 1821
- Genus Pisum Megerle von Mühlfeld, 1811
- Genus Protosphaerium Hocknull, 2000 † (2)
- Genus Sphaericoncha C. M. Kolesnikov, 1980 † (4)
- Genus Sphaerinova Iredale, 1943 accepted as Musculium (Sphaerinova) Iredale, 1943
- Genus Sphaerioides J.-S. Yu & K. Zhang, 1982 † (3)
- Genus Tetoriunio Koarai & Matsukawa, 2016 † accepted as Megasphaerioides Komatsu, J.-H. Chen & Q.-F. Wang, 2003 †
- Family Starobogatoviconchidae Zykin †
- Order Venerida (2 821)
- Superfamily Cyamioidea G. O. Sars, 1878 (98)
- Superfamily Gaimardioidea Hedley, 1916 accepted as Cyamioidea G. O. Sars, 1878
- Superfamily Galeommatacea accepted as Galeommatoidea J. E. Gray, 1840
- Superfamily Grammysioidea S. A. Miller, 1877 † (90)
- Superfamily Kalenteroidea Marwick, 1953 † (39)
- Superfamily Mactracea accepted as Mactroidea Lamarck, 1809
- Order Anomalodesmacea accepted as Anomalodesmata
- Order Euheterodonta incertae sedis (27)
- Order Pholadomyida represented as Anomalodesmata
- Family Lipanellidae T. M. Sánchez, 2005 † (4)
- Family Rhaetidiidae Dominici & Danise, 2024 † (2)
- Subterclass Heterodonta
- Subterclass Palaeoheterodonta (4 072)
- Superorder Heteroconchia incertae sedis † (1)
- Infraclass Pteriomorphia (6 658)
- 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 (102 697)
- 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