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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)
Subterclass Archiheterodonta (1 205)
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)
Suborder Myina represented as Myida
Superfamily Dreissenoidea J. E. Gray, 1840 (304)
Family Dreissenidae J. E. Gray, 1840 (304)
Subfamily Congeriinae Mandic & Harzhauser, 2016 (132)
Subfamily Dreisseninae J. E. Gray, 1840 (139)
Genus Dithalmia J. C. Jay, 1835 accepted as Dreissena van Beneden, 1835
Genus Dreissena van Beneden, 1835 (83)
Subgenus Dreissena (Carinodreissena) Lvova & Starobogatov, 1982 represented as Dreissena van Beneden, 1835
Subgenus Dreissena (Coelogonia) Bronn, 1837 † accepted as Coelogonia Bronn, 1837 †
Subgenus Dreissena (Congeria) Partsch, 1835 † accepted as Congeria Partsch, 1835
Subgenus Dreissena (Dreissena) Van Beneden, 1835 represented as Dreissena van Beneden, 1835
Subgenus Dreissena (Modiolodreissena) Babak, 1983 † represented as Dreissena van Beneden, 1835
Subgenus Dreissena (Mytiloides) Brongniart, 1822 † accepted as Mytiloides Brongniart, 1822 †
Subgenus Dreissena (Pontodreissena) Logvinenko & Starobogatov, 1966 represented as Dreissena van Beneden, 1835
Subgenus Dreissena (Praxis) H. Adams & A. Adams, 1857 accepted as Mytilopsis Conrad, 1858
Species Dreissena abchasica Seninski, 1905 †
Species Dreissena accurtii Brusina, 1892 †
Species Dreissena acuta Etheridge, 1879 † accepted as Mytilopsis scripta (Conrad, 1874) †
Species Dreissena africana van Beneden, 1835 accepted as Mytilopsis africana (van Beneden, 1835)
Species Dreissena alata Brusina, 1874 † accepted as Rhombocongeria rhomboidea alata (Brusina, 1874) †
Species Dreissena anatolica Locard, 1893
Species Dreissena angusta (Rousseau, 1842) †
Species Dreissena angustiformis V. P. Kolesnikov, 1950 † accepted as Dreissena polymorpha (Pallas, 1771)
Species Dreissena anisoconcha Andrusov, 1893 †
Species Dreissena antiqua Melleville, 1843 † accepted as Perna antiqua (Melleville, 1843) †
Species Dreissena arnouldi Bourguignat, 1893 accepted as Dreissena polymorpha (Pallas, 1771)
Species Dreissena auricularis (T. Fuchs, 1870) †
Species Dreissena bakuana Andrusov, 1897 † accepted as Dreissena (Pontodreissena) rostriformis bakuana Andrusov, 1897 †
Species Dreissena balchaschensis Tolstikova, 1994 †
Species Dreissena bananaensis Preston, 1909 accepted as Mytilopsis ornata (Morelet, 1885)
Species Dreissena baraganica Andrusov, 1897 †
Species Dreissena basteroti (Deshayes, 1836) † accepted as Andrusoviconcha basteroti (Deshayes, 1836) †
Species Dreissena batinensis Basch, 1993 †
Species Dreissena bedoti Locard, 1893 accepted as Dreissena polymorpha (Pallas, 1771)
Species Dreissena benedeni Andrusov, 1897 †
Species Dreissena berbestiensis Fontannes, 1887 †
Species Dreissena bipartita Andrusov, 1897 †
Species Dreissena blanci Westerlund, 1890 accepted as Dreissena carinata (Dunker, 1853)
Species Dreissena bogatschevi A. A. Ali-Zade, 1961 † accepted as Dreissena caspia isseli Andrusov, 1923 †
Species Dreissena bosphorana Papaianopol, 1976 †
Species Dreissena bouldourensis d'Archiac, 1866 † accepted as Dreissena diluvii bouldourensis d'Archiac, 1866 †
Species Dreissena bourguignati Locard, 1883
Species Dreissena brardii (Brongniart, 1823) † accepted as Coelogonia brardii (Brongniart, 1823) †
Species Dreissena brusinai Andrusov, 1893 †
Species Dreissena bugensis Andrusov, 1897
Species Dreissena bukowskii Andrusov, 1893 †
Species Dreissena bulgarica Brusina, 1902 †
Species Dreissena calochroma Brusina, 1902 †
Species Dreissena caputlacus Schütt, 1993
Species Dreissena carinata (Dunker, 1853)
Species Dreissena carinatocurvata Sinzov, 1912 †
Species Dreissena caspia Eichwald, 1855
Species Dreissena chaldanica Sultanov, 1963 †
Species Dreissena chemnitzi Westerlund & Blank, 1879 accepted as Dreissena carinata (Dunker, 1853)
Species Dreissena chonioides Cossmann, 1887 †
Species Dreissena clavaeformis Krauss, 1852 † accepted as Mytilopsis clavaeformis (Krauss, 1852) †
Species Dreissena cristellata (L. Roth, 1881) †
Species Dreissena croatica Brusina, 1874 † accepted as Trigonipraxis croatica (Brusina, 1874) †
Species Dreissena cucullata Brusina, 1892 †
Species Dreissena cumingiana Dunker, 1855 accepted as Mytilopsis leucophaeata (Conrad, 1831)
Species Dreissena curvirostris Cossmann, 1887 †
Species Dreissena cyanea van Beneden, 1838 accepted as Mytilopsis africana (van Beneden, 1835)
Species Dreissena cyclorampha Davitashvili & Krestovnikov, 1931 † accepted as Dreissena (Dreissena) dilatata Andrusov, 1929 †
Species Dreissena cymbula Brusina, 1892 †
Species Dreissena dalmatica Brusina, 1874 † accepted as Illyricocongeria dalmatica (Brusina, 1874) †
Species Dreissena decipiens Mayer, 1856 †
Species Dreissena demeteri Brusina, 1902 †
Species Dreissena deshayesi Capellini, 1860 †
Species Dreissena dilatata Andrusov, 1929 †
Species Dreissena diluvii (Abich, 1859) †
Species Dreissena dimitrijevici Pavlović, 1903 †
Species Dreissena distincta Andrusov, 1897 accepted as Dreissena grimmi Andrusov, 1890
Species Dreissena dobrei Brusina, 1902 †
Species Dreissena domingensis Récluz, 1852 accepted as Mytilopsis sallei (Récluz, 1849)
Species Dreissena dubia (Mayer, 1871) †
Species Dreissena eichwaldi Issel, 1865 accepted as Dreissena caspia Eichwald, 1855
Species Dreissena elata Andrusov, 1897
Species Dreissena elongata Locard, 1893 accepted as Dreissena siouffi (Locard, 1893)
Species Dreissena elongata Jekelius, 1932 †
Species Dreissena eocaena Oppenheim, 1890 † accepted as Mytilopsis eocaena (Oppenheim, 1890) †
Species Dreissena escarina Andrusov, 1917 †
Species Dreissena euchroma (Oppenheim, 1891) † accepted as Prodreissensia euchroma (Oppenheim, 1891) †
Species Dreissena exigua (L. Roth, 1881) †
Species Dreissena filifera Andrusov, 1893 †
Species Dreissena fischeri Andrusov, 1897 †
Species Dreissena fluviatilis (Pallas, 1771) accepted as Dreissena polymorpha (Pallas, 1771)
Species Dreissena fragilis O. Boettger, 1878 † accepted as Mytilopsis scripta (Conrad, 1874) †
Species Dreissena gabrici Basch, 1993 †
Species Dreissena gallandi (Locard, 1893)
Species Dreissena gasperinii Brusina, 1907 †
Species Dreissena gibberosa Preston, 1909 accepted as Mytilopsis africana (van Beneden, 1835)
Species Dreissena gibboides Andrusov, 1923 †
Species Dreissena gnezdai Brusina, 1884 † accepted as Trigonipraxis gnezdai (Brusina, 1884) †
Species Dreissena gradici Brusina, 1902 †
Species Dreissena graecata Fontannes, 1882 †
Species Dreissena grimmi Andrusov, 1890
Species Dreissena gundlachii Dunker, 1855 accepted as Mytilopsis sallei (Récluz, 1849)
Species Dreissena harmandi Rochebrune, 1882 accepted as Sinomytilus harmandi (Rochebrune, 1882)
Species Dreissena hellenica Locard, 1893 accepted as Dreissena carinata (Dunker, 1853)
Species Dreissena helvetica Locard, 1893 †
Species Dreissena hermosa Locard, 1893 accepted as Dreissena gallandi (Locard, 1893)
Species Dreissena hierapolitana Oppenheim, 1919 † accepted as Dreissena kairanderensis (Oppenheim, 1919) †
Species Dreissena holmi d'Ailly, 1896 accepted as Mytilopsis ornata (Morelet, 1885)
Species Dreissena iconica Schütt, 1991 †
Species Dreissena impar Andrusov, 1893 †
Species Dreissena inaequivalvis (Deshayes, 1838) †
Species Dreissena incrassata Andrusov, 1923 †
Species Dreissena irregularis Andrusov, 1897 †
Species Dreissena israelica Schütt, 1993 †
Species Dreissena isseli Andrusov, 1923 † accepted as Dreissena caspia isseli Andrusov, 1923 †
Species Dreissena kairanderensis (Oppenheim, 1919) †
Species Dreissena kuesteri Dunker, 1855 accepted as Dreissena polymorpha (Pallas, 1771)
Species Dreissena lacunosa (Locard, 1893) accepted as Dreissena gallandi (Locard, 1893)
Species Dreissena lacustris Morelet, 1860 accepted as Mytilopsis lacustris (Morelet, 1860)
Species Dreissena lanceolata (J. De C. Sowerby, 1823) † accepted as Cuneolus lanceolatus (J. De C. Sowerby, 1823) †
Species Dreissena lata (Andrusov, 1897) † accepted as Dreissena elata Andrusov, 1897
Species Dreissena latiuscula (Mayer, 1871) †
Species Dreissena latro Andrusov, 1897 † accepted as Dreissena polymorpha (Pallas, 1771)
Species Dreissena letourneuxi Locard, 1893 accepted as Dreissena gallandi (Locard, 1893)
Species Dreissena ljubici Brusina, 1902 †
Species Dreissena locardi Locard, 1893 accepted as Dreissena polymorpha (Pallas, 1771)
Species Dreissena lunata A. A. Ali-Zade, 1961 † accepted as Dreissena polymorpha (Pallas, 1771)
Species Dreissena lutetiana Locard, 1893 accepted as Dreissena polymorpha (Pallas, 1771)
Species Dreissena lycophila Oppenheim, 1919 †
Species Dreissena macrocephala G. I. Popov, 1953 †
Species Dreissena magnifica Locard, 1893 accepted as Dreissena polymorpha (Pallas, 1771)
Species Dreissena markovici Brusina, 1884 † accepted as Congeria markovici (Brusina, 1884) †
Species Dreissena marmorata Brusina, 1902 †
Species Dreissena matavulji Brusina, 1902 †
Species Dreissena mayeri Sacco, 1886 †
Species Dreissena messariana A. A. Ali-Zade, 1961 † accepted as Dreissena caspia isseli Andrusov, 1923 †
Species Dreissena minervae Chelidze, 1947 † accepted as Dreissena (Dreissena) angusta (Rousseau, 1842) †
Species Dreissena minima Lörenthey, 1906 † accepted as Mytilopsis minima (Lörenthey, 1906) †
Species Dreissena minor (T. Fuchs, 1877) †
Species Dreissena mischovdagica A. A. Ali-Zade & Aleskerov, 1969 †
Species Dreissena miserabilis Gabuniya, 1953 † accepted as Dreissena (Pontodreissena) rostriformis colchica Chelidze, 1947 †
Species Dreissena mladini Brusina, 1902 †
Species Dreissena mobilis Taktakishvili, 1973 † accepted as Dreissena (Pontodreissena) rostriformis corniculata Stefanescu, 1896 †
Species Dreissena moerchiana Dunker, 1855 accepted as Mytilopsis sallei (Récluz, 1849)
Species Dreissena muensteri Brusina, 1893 †
Species Dreissena novorossica Sinzov, 1876 † accepted as Coelogonia novorossica (Sinzov, 1876) †
Species Dreissena nystiana A. d'Orbigny, 1852 † accepted as Congeria nystiana (A. d'Orbigny, 1852) †
Species Dreissena obliqua Seninski, 1905 †
Species Dreissena obtusecarinata Andrusov, 1897 accepted as Dreissena polymorpha (Pallas, 1771)
Species Dreissena occidentalis Locard, 1893 accepted as Dreissena polymorpha (Pallas, 1771)
Species Dreissena oppenheimi (Taeger, 1908) †
Species Dreissena oraphensis Gabuniya, 1953 †
Species Dreissena ornata (Morelet, 1885) accepted as Mytilopsis ornata (Morelet, 1885)
Species Dreissena pallasi Andrusov, 1897 accepted as Dreissena polymorpha (Pallas, 1771)
Species Dreissena paradoxa Bourguignat, 1893 accepted as Dreissena polymorpha (Pallas, 1771)
Species Dreissena phrygica Oppenheim, 1919 † accepted as Dreissena kairanderensis (Oppenheim, 1919) †
Species Dreissena plebeja "De Stefani, 1878" † accepted as Dreissena dubia (Mayer, 1871) †
Species Dreissena polymorpha (Pallas, 1771)
Species Dreissena prediluvii Frolov, 2021 †
Species Dreissena prisca (K. Papp, 1897) †
Species Dreissena pseudomirabilis Chelidze, 1952 † accepted as Dreissena (Dreissena) dilatata Andrusov, 1929 †
Species Dreissena pseudosubcarinata Babak, 1983 †
Species Dreissena pseudoturgida Babak, 1983 †
Species Dreissena purpurascens W. H. Benson, 1842 accepted as Mytilisepta virgata (Wiegmann, 1837)
Species Dreissena rara A. A. Ali-Zade, 1961 † accepted as Dreissena elata rara A. A. Ali-Zade, 1961 †
Species Dreissena rhodiensis Bukowski, 1896 †
Species Dreissena riisei (Dunker, 1853) accepted as Mytilopsis sallei (Récluz, 1849)
Species Dreissena rimestiensis Fontannes, 1887 †
Species Dreissena rossii Brusina, 1893 †
Species Dreissena rostriformis (Deshayes, 1838) †
Species Dreissena sabbae Brusina, 1892 †
Species Dreissena sallei Récluz, 1849 accepted as Mytilopsis sallei (Récluz, 1849)
Species Dreissena sandbergerii Andrusov, 1890 † accepted as Coelogonia sandbergerii (Andrusov, 1890) †
Species Dreissena schirvanica A. A. Ali-Zade & Aleskerov, 1969 †
Species Dreissena semen De Stefani, 1880 † accepted as Dreissena dubia (Mayer, 1871) †
Species Dreissena semendriensis Stevanović, 1951 †
Species Dreissena senensis [sic] † accepted as Dreissenia sanensis Mayer, 1864 †
Species Dreissena serbica Brusina, 1894 †
Species Dreissena serrata Melleville, 1843 † accepted as Septifer serratus (Melleville, 1843) †
Species Dreissena siamensis Morelet, 1866 accepted as Limnoperna siamensis (Morelet, 1866)
Species Dreissena simplex (Barbot de Marny, 1869) †
Species Dreissena siouffi (Locard, 1893)
Species Dreissena sowerbyi A. d'Orbigny, 1850 †
Species Dreissena stankovici Lvova & Starobogatov, 1982 accepted as Dreissena carinata (Dunker, 1853)
Species Dreissena subgibba Andrusov, 1923 †
Species Dreissena superfoetata Brusina, 1884 †
Species Dreissena suprangusta Davitashvili, 1937 †
Species Dreissena swinhoei H. Adams, 1870 accepted as Sinomytilus swinhoei (H. Adams, 1870)
Species Dreissena tenuissima Sinzov, 1875 †
Species Dreissena theodorii Andrusov, 1893 †
Species Dreissena thiesae Locard, 1893 accepted as Dreissena carinata (Dunker, 1853)
Species Dreissena tippana Conrad, 1858 † accepted as Cuneolus tippanus (Conrad, 1858) †
Species Dreissena tortuosa Andrusov, 1923 † accepted as Dreissena (Pontodreissena) rostriformis tortuosa Andrusov, 1923 †
Species Dreissena tschaudae Andrusov, 1897 † accepted as Dreissena (Pontodreissena) rostriformis tschaudae Andrusov, 1897 †
Variety Dreissena tschaudae var. pontocaspica Andrusov, 1897 accepted as Dreissena grimmi Andrusov, 1890
Species Dreissena turislavica Jekelius, 1944 † accepted as Mytilopsis turislavica (Jekelius, 1944) †
Species Dreissena valahica Papaianopol, 1992 †
Species Dreissena weberi Seninski, 1905 † accepted as Dreissena (Dreissena) polymorpha weberi Seninski, 1905 †
Species Dreissena zagrabiensis Brusina, 1884 † accepted as Andrusoviconcha zagrabiensis (Brusina, 1884) †
Genus Dreissenia [sic] accepted as Dreissena van Beneden, 1835
Genus Dreissensia P. Fischer, 1886 accepted as Dreissena van Beneden, 1835
Genus Dreyssensia [sic] accepted as Dreissena van Beneden, 1835
Genus Mytilina Cantraine, 1837 accepted as Dreissena van Beneden, 1835
Genus Mytilopsis Conrad, 1858 (54)
Genus Praxis H. Adams & A. Adams, 1857 accepted as Mytilopsis Conrad, 1858
Genus Prodreissensia Rovereto, 1898 † (2)
Genus Tichogonia Rossmässler, 1835 accepted as Dreissena van Beneden, 1835
Subfamily Dreissenomyinae Babak, 1983 † (16)
Genus Carinatocongeria Stevanović, 1990 † (3)
Genus Coelogonia Bronn, 1837 † (9)
Genus Rheodreissena Geda, Lujan, M. Perkins, Abernethy, Sabaj & Gangloff, 2018 (5)
Genus Teisseyreomya Bolgiu, 1954 †
Superfamily Myoidea Lamarck, 1809 (309)
Superfamily Pholadacea accepted as Pholadoidea Lamarck, 1809
Superfamily Pholadoidea Lamarck, 1809 (294)
Superfamily Pleuromyoidea Zittel, 1895 † (17)
Family Aloididae Thiele, 1934 accepted as Corbulidae Lamarck, 1818
Family Myacidae accepted as Myidae Lamarck, 1809
Order Sphaeriida (662)
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 (6 644)
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