Between brackets is the number of accepted species

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- Mollusca (132 738)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 984)
- Subclass Autobranchia (23 270)
- Infraclass Heteroconchia (16 634)
- Subterclass Archiheterodonta (1 205)
- Subterclass Euheterodonta (11 356)
- Subterclass Heterodonta
- Subterclass Palaeoheterodonta (4 072)
- Order Trigoniida (1 482)
- Order Unionida (2 579)
- Superfamily Deccanoidoidea N. H. Shah & Patel, 2024 †
- Superfamily Etherioidea Deshayes, 1832 (148)
- Superfamily Hyrioidea Swainson, 1840 accepted as Unionoidea Rafinesque, 1820
- Superfamily Silesunionoidea Skawina & Dzik, 2011 † (11)
- Superfamily Tamesnelloidea Van Damme & Bogan, 2015 † (2)
- Superfamily Unionoidea Rafinesque, 1820 (2 417)
- Family Cumberlandiidae Heard & Guckert, 1970 accepted as Margaritiferidae J. Henderson, 1929 (1910)
- Family Hyriidae Swainson, 1840 (147)
- Family Jilinoconchidae Q.-H. Ma, 1989 † accepted as Unionidae Rafinesque, 1820
- Family Liaoningiidae J.-S. Yu & G.-Y. Dong, 1993 † accepted as Sibireconchidae C. M. Kolesnikov, 1977 †
- Family Margaritanidae Ortmann, 1910 accepted as Margaritiferidae J. Henderson, 1929 (1910)
- Family Margaritiferidae J. Henderson, 1929 (1910) (93)
- Family Monginaiidae Delvene & Munt, 2022 † (1)
- Family Propehyridellidae Iredale, 1934 accepted as Hyriidae Swainson, 1840
- Family Sancticarolitidae Simone & Mezzalira, 1997 † (1)
- Family Tegulaedontidae Van Damme & Bogan, 2015 † (3)
- Family Unionidae Rafinesque, 1820 (2 172)
- Subfamily Alasmidontinae Rafinesque, 1820 accepted as Anodontini Rafinesque, 1820
- Subfamily Ambleminae Rafinesque, 1820 (428)
- Subfamily Anodontinae Rafinesque, 1820 accepted as Anodontini Rafinesque, 1820
- Subfamily Cuneopsinae Mongin, 1963 accepted as Oxynaiini Starobogatov, 1970
- Subfamily Gonideinae Ortmann, 1916 (185)
- Subfamily Heudeaninae Modell, 1942 accepted as Gonideinae Ortmann, 1916 (1)
- Subfamily Hyriopsinae Modell, 1942 accepted as Rectidentini Modell, 1942
- Subfamily Lamprotulinae Modell, 1942 accepted as Lamprotulini Modell, 1942
- Subfamily Lampsilinae Ihering, 1901 accepted as Lampsilini Ihering, 1901
- Subfamily Leguminaiinae Starobogatov, 1970 accepted as Gonideini Ortmann, 1916
- Subfamily Limnoscaphinae Lindholm, 1932 accepted as Rectidentini Modell, 1942
- Subfamily Margaritaninae Ortmann, 1910 accepted as Margaritiferinae J. Henderson, 1929 (1910)
- Subfamily Megalonaiadinae Heard & Guckert, 1971 accepted as Quadrulini Ihering, 1901
- Subfamily Modellnaiinae Brandt, 1974 (1)
- Subfamily Nodulariinae Starobogatov & Zatravkin, 1987 accepted as Nodulariini Starobogatov & Zatravkin, 1987
- Subfamily Parreysiinae J. Henderson, 1935 (150)
- Subfamily Physunioninae Starobogatov, 1970 accepted as Contradentini Modell, 1942
- Subfamily Pseudanodontinae Stadnichenko, 1984 accepted as Anodontini Rafinesque, 1820
- Subfamily Pseudodontinae Frierson, 1927 (60)
- Subfamily Psilunioninae Starobogatov, 1970
- Subfamily Qiyangiinae J.-H. Chen, 1983 † (66)
- Subfamily Quadrulinae Ihering, 1901 accepted as Quadrulini Ihering, 1901
- Subfamily Rectidentinae Modell, 1942 (134)
- Subfamily Strophitinae Starobogatov, 1970 accepted as Anodontini Rafinesque, 1820
- Subfamily Unionidae incertae sedis (357)
- Subfamily Unioninae Rafinesque, 1820 (790)
- Tribe Aculamprotulini X.-C. Huang & X.-P. Wu, 2019 (8)
- Tribe Anodontini Rafinesque, 1820 (104)
- Tribe Cristariini Lopes-Lima, Bogan & Froufe, 2017 (64)
- Genus Acudonta R. Wu, L. Liu & L. Zhang, 2025 (1)
- Genus Amuranodonta Moskvicheva, 1973 (1)
- Genus Anemina F. Haas, 1969 (3)
- Genus Appius Menke, 1830 accepted as Cristaria Schumacher, 1817
- Genus Arsenievinaia Zatravkin & Bogatov, 1987 accepted as Beringiana Starobogatov, 1983
- Genus Barbala Gray, 1825 accepted as Cristaria Schumacher, 1817
- Genus Beringiana Starobogatov, 1983 (4)
- Genus Buldowskia Moskvicheva, 1973 (5)
- Genus Clione Gistel, 1848 accepted as Cristaria Schumacher, 1817
- Genus Craspedodonta Herrmannsen, 1852 accepted as Cristaria Schumacher, 1817
- Genus Cristaria Schumacher, 1817 (18)
- Genus Dianisotis Rafinesque, 1831 accepted as Cristaria Schumacher, 1817
- Genus Dipsas Leach, 1814 accepted as Cristaria Schumacher, 1817
- Genus Dipsax Voigt, 1834 accepted as Cristaria Schumacher, 1817
- Genus Haasiella Lindholm, 1925 accepted as Anemina F. Haas, 1969
- Genus Kunashiria Starobogatov, 1983 accepted as Beringiana Starobogatov, 1983
- Genus Mimo H.-Q. Xiang, Y.-Z. Lu, Y.-M. He & C.-Y. Li, 2025 (3)
- Genus Pletholophus C. T. Simpson, 1900 (4)
- Genus Sinanodonta Modell, 1945 (25)
- Subgenus Sinanodonta (Anemina) F. Haas, 1969 accepted as Anemina F. Haas, 1969
- Subgenus Sinanodonta (Cristariopsis) Moskvicheva, 1973 accepted as Sinanodonta Modell, 1945
- Subgenus Sinanodonta (Ellipsanodon) Bogatov & Starobogatov, 1996 accepted as Sinanodonta Modell, 1945
- Subgenus Sinanodonta (Sinanodonta) Modell, 1945 accepted as Sinanodonta Modell, 1945
- Species Sinanodonta amurensis Moskvicheva, 1973
- Species Sinanodonta angula (S. Tchang, S.-C. Li & Y.-Y. Liu, 1965)
- Species Sinanodonta beringiana (Middendorff, 1851) accepted as Beringiana beringiana (Middendorff, 1851)
- Species Sinanodonta brandenburgi (Brusina, 1902) †
- Species Sinanodonta bronni (D'Ancona, 1867) † accepted as Anodonta bronni D'Ancona, 1867 †
- Species Sinanodonta calipygos (Kobelt, 1879)
- Species Sinanodonta crassitesta Moskvicheva, 1973 accepted as Sinanodonta schrenkii (I. Lea, 1870)
- Species Sinanodonta elliptica (Heude, 1878)
- Species Sinanodonta fukudai Modell, 1945 accepted as Sinanodonta lauta (E. von Martens, 1877)
- Species Sinanodonta getica Papaianopol, 1997 †
- Species Sinanodonta gibba (W. H. Benson, 1842) accepted as Sinanodonta woodiana (I. Lea, 1834)
- Species Sinanodonta gigantea (Martinson, 1951) †
- Species Sinanodonta horvathi (Brusina, 1902) †
- Species Sinanodonta hunganhi Thach, 2016
- Species Sinanodonta japonica (Clessin, 1874) accepted as Beringiana japonica (Clessin, 1874)
- Species Sinanodonta jourdyi (Morlet, 1886)
- Species Sinanodonta lauta (E. von Martens, 1877)
- Subspecies Sinanodonta lauta rustavelii (Bogachev, 1936) †
- Subspecies Sinanodonta lauta staeschei Modell, 1945 † accepted as Potomida stachei (Neumayr, 1875) †
- Species Sinanodonta likharevi Moskvicheva, 1973 accepted as Sinanodonta schrenkii (I. Lea, 1870)
- Species Sinanodonta lucida (Heude, 1878)
- Species Sinanodonta mactraeformis (Brusina, 1902) †
- Species Sinanodonta mactriformis [sic] † accepted as Sinanodonta mactraeformis (Brusina, 1902) †
- Species Sinanodonta manchurica Bogatov & Starobogatov, 1996 accepted as Sinanodonta lauta (E. von Martens, 1877)
- Species Sinanodonta martinsoni [sic] † accepted as Sinanodonta martinsonii (Popova, 1961) †
- Species Sinanodonta martinsonii (Popova, 1961) †
- Species Sinanodonta ogurae (Kuroda & T. Habe, 1987)
- Species Sinanodonta orbicularis (Heude, 1880) accepted as Sinanodonta woodiana (I. Lea, 1834)
- Species Sinanodonta pacifica (Heude, 1878)
- Species Sinanodonta podarensis Papaianopol, 1997 †
- Species Sinanodonta primorjensis Bogatov & Zatravkin, 1988 accepted as Sinanodonta amurensis Moskvicheva, 1973
- Species Sinanodonta puerorum (Heude, 1880) accepted as Sinanodonta woodiana (I. Lea, 1834)
- Species Sinanodonta qingyuani J. He & Z. Zhuang, 2013 accepted as Sinanodonta woodiana (I. Lea, 1834)
- Species Sinanodonta rectangula (B.-Y. Huang, 1964) †
- Species Sinanodonta rotunda Popova, 1981 †
- Species Sinanodonta schrenkii (I. Lea, 1870)
- Species Sinanodonta subpiscinalis (Martinson, 1951) †
- Species Sinanodonta subundata (Wenz, 1942) †
- Species Sinanodonta tchernovi Schütt, 1993 †
- Species Sinanodonta tigilensis Chepalyga, 1976 †
- Species Sinanodonta tumens (F. Haas, 1910)
- Species Sinanodonta undatula Tolstikova, 1976 †
- Species Sinanodonta vescoiana (Bourguignat, 1856) † accepted as Anodonta vescoiana Bourguignat, 1856
- Species Sinanodonta woodiana (I. Lea, 1834)
- Tribe Cuneopsini Mongin, 1963 accepted as Cuneopsinae Mongin, 1963
- Tribe Lanceolariini Froufe, Lopes-Lima & Bogan, 2017 (22)
- Tribe Lepidodesmini X.-C. Huang & X.-P. Wu, 2019 (9)
- Tribe Middendorffinaiini Lopes-Lima, Bolotov & Bogan, 2020 (1)
- Tribe Nodulariini Starobogatov & Zatravkin, 1987 accepted as Oxynaiini Starobogatov, 1970
- Tribe Oxynaiini Starobogatov, 1970 (141)
- Tribe Unionini Rafinesque, 1820 (441)
- Genus Strophitinae M. E. Gordon, 1981 accepted as Strophitinae Starobogatov, 1970
- Family Deccanoidea N. H. Shah & Patel, 2024 † accepted as Deccanoidoidea N. H. Shah & Patel, 2024 †
- Family Pachycardiidae L. R. Cox, 1961 † accepted as Trigonodidae Modell, 1942 †
- Family Silesunionina Skawina & Dzik, 2011 † accepted as Silesunionoidea Skawina & Dzik, 2011 †
- Genus Araripenaia V. R. Silva et al., 2020 † (1)
- Family Lyrodesmatidae P. Fischer, 1886 † (8)
- Family Pseudarcidae Scarlato & Starobogatov, 1979 † (3)
- Family Thoraliidae N. J. Morris, 1980 †
- Superorder Heteroconchia incertae sedis † (1)
- Infraclass Pteriomorphia (6 636)
- 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 (1 830)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 673)
- 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