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)
- Genus Alasmidonta Say, 1818 (13)
- Genus Anodon Swainson, 1840 accepted as Anodonta Lamarck, 1799
- Subgenus Anodon (Pseudodon) A. Gould, 1844 accepted as Pseudodon A. Gould, 1844
- Species Anodon annulatus G. B. Sowerby II, 1867 accepted as Strophitus undulatus (Say, 1817)
- Species Anodon arcaeformis Heude, 1877 accepted as Anemina arcaeformis (Heude, 1877)
- Species Anodon areolatus Swainson, 1829 accepted as Strophitus undulatus (Say, 1817)
- Species Anodon bambousearum Morelet, 1851 accepted as Anodontites cylindracea (I. Lea, 1838)
- Species Anodon batesii H. Woodward, 1871 † accepted as Anodontites batesii (H. Woodward, 1871) †
- Species Anodon biangulata G. B. Sowerby II, 1869 accepted as Gonidea angulata (I. Lea, 1838)
- Species Anodon cognata A. Gould, 1850 accepted as Anodonta oregonensis I. Lea, 1838
- Species Anodon elliptica Heude, 1878 accepted as Sinanodonta elliptica (Heude, 1878)
- Species Anodon euscaphys Heude, 1879 accepted as Anemina euscaphys (Heude, 1879)
- Species Anodon feminalis A. Gould, 1850 accepted as Gonidea angulata (I. Lea, 1838)
- Species Anodon fenouilii Heude, 1878 accepted as Mimo fenouilii (Heude, 1878)
- Species Anodon flava J. G. Anthony, 1865 accepted as Pyganodon fragilis (Lamarck, 1819)
- Species Anodon fluminea Heude, 1877 accepted as Anemina fluminea (Heude, 1877)
- Species Anodon georginae J. E. Gray, 1833
- Species Anodon glabrus G. B. Sowerby II, 1870 accepted as Anodonta impura Say, 1829
- Species Anodon glandulosa J. G. Anthony, 1865 accepted as Pyganodon fragilis (Lamarck, 1819)
- Species Anodon glauca A. Gould, 1850 accepted as Anodontites crispata Bruguière, 1792
- Species Anodon globosula Heude, 1878 accepted as Anemina globosula (Heude, 1878)
- Species Anodon horda A. Gould, 1855 accepted as Utterbackia imbecillis (Say, 1829)
- Species Anodon imbricata J. G. Anthony, 1865 accepted as Pyganodon grandis (Say, 1829)
- Species Anodon indecora Heude, 1880 accepted as Sinanodonta woodiana (I. Lea, 1834)
- Species Anodon inornata J. G. Anthony, 1866 accepted as Pyganodon grandis (Say, 1829)
- Species Anodon inoscularis A. Gould, 1844 accepted as Pseudodon inoscularis (A. Gould, 1844)
- Species Anodon irisans J. G. Anthony, 1865 accepted as Pyganodon fragilis (Lamarck, 1819)
- Species Anodon jukesii Forbes, 1853 † accepted as Archanodon jukesii (Forbes, 1853) †
- Species Anodon limosa Heude, 1880 accepted as Sinanodonta woodiana (I. Lea, 1834)
- Species Anodon livida Heude, 1880 accepted as Sinanodonta woodiana (I. Lea, 1834)
- Species Anodon longinus Spix, 1827 accepted as Mycetopoda siliquosa (Spix, 1827)
- Species Anodon lucasii Morelet, 1851 accepted as Anodonta cygnea (Linnaeus, 1758)
- Species Anodon lucida Heude, 1878 accepted as Sinanodonta lucida (Heude, 1878)
- Species Anodon mcnielii J. G. Anthony, 1866 accepted as Pyganodon grandis (Say, 1829)
- Species Anodon micans J. G. Anthony, 1865 accepted as Pyganodon grandis (Say, 1829)
- Species Anodon nopalatensis G. B. Sowerby II, 1867 accepted as Pyganodon grandis (Say, 1829)
- Species Anodon opalina J. G. Anthony, 1865 accepted as Pyganodon grandis (Say, 1829)
- Species Anodon pallegoixi G. B. Sowerby II, 1867 accepted as Lens pallegoixi (G. B. Sowerby II, 1867)
- Species Anodon pallida J. G. Anthony, 1865 accepted as Pyganodon fragilis (Lamarck, 1819)
- Species Anodon papyracea J. G. Anthony, 1865 accepted as Strophitus undulatus (Say, 1817)
- Species Anodon pholadiformis G. B. Sowerby II, 1870 accepted as Pyganodon fragilis (Lamarck, 1819)
- Species Anodon plicatus Haldeman, 1842 accepted as Anodontoides ferussacianus (I. Lea, 1834)
- Species Anodon purpurascens Swainson, 1823 accepted as Leptodea leptodon (Rafinesque, 1820)
- Species Anodon quadriplicatus G. B. Sowerby II, 1870 accepted as Strophitus undulatus (Say, 1817)
- Species Anodon rotundatus (Swainson, 1841) accepted as Sinanodonta woodiana (I. Lea, 1834)
- Species Anodon rugosus Swainson, 1822 accepted as Strophitus undulatus (Say, 1817)
- Species Anodon salweniana A. Gould, 1844 accepted as Pseudodon salwenianus (A. Gould, 1844)
- Species Anodon subangulata J. G. Anthony, 1865 accepted as Pyganodon grandis (Say, 1829)
- Species Anodon subgibbosa J. G. Anthony, 1866 accepted as Pyganodon grandis (Say, 1829)
- Species Anodon subinflata J. G. Anthony, 1865 accepted as Pyganodon grandis (Say, 1829)
- Species Anodon subreniformis G. B. Sowerby II, 1867 accepted as Aspatharia subreniformis (G. B. Sowerby II, 1867)
- Species Anodon susannae J. E. Gray, 1833 accepted as Anodontites trapesialis (Lamarck, 1819)
- Species Anodon torrentis Heude, 1878 accepted as Anemina fluminea (Heude, 1877)
- Species Anodon unadilla DeKay, 1843 accepted as Strophitus undulatus (Say, 1817)
- Genus Anodonta Lamarck, 1799 (40)
- Genus Anodontoides C. T. Simpson, 1898 (2)
- Genus Arcidens C. T. Simpson, 1900 (3)
- Genus Arconaia Conrad, 1865 accepted as Lanceolaria Conrad, 1853
- Genus Colletopterum Bourguignat, 1880 accepted as Anodonta Lamarck, 1799
- Genus Cyclanodonta Starobogatov, 1970 † (1)
- Genus Dalliella C. T. Simpson, 1900 accepted as Simpsonella T. D. A. Cockerell, 1903
- Genus Gabillotia Servain, 1891 accepted as Anodonta Lamarck, 1799
- Genus Glochidium Rathke, 1797 accepted as Anodonta Lamarck, 1799
- Genus Lasmigona Rafinesque, 1831 (8)
- Genus Modelliella Starobogatov, 1970 † (1)
- Genus Oguranodonta Kuroda & T. Habe, 1987 accepted as Sinanodonta Modell, 1945
- Genus Pegias C. T. Simpson, 1900 (1)
- Genus Prolasmidonta Ortmann, 1914 (1)
- Genus Pseudanodonta Bourguignat, 1877 (3)
- Genus Pseudodontoideus Frierson, 1927 (2)
- Genus Purpurina Herrmannsen, 1852 accepted as Simpsonella T. D. A. Cockerell, 1903
- Genus Pyganodon Crosse & P. Fischer, 1894 (5)
- Genus Sichuanoconcha X.-Z. Liu, 1984 † (6)
- Genus Simpsonaias Frierson, 1914 (1)
- Genus Simpsonella T. D. A. Cockerell, 1903 (2)
- Genus Strophitus Rafinesque, 1820 (7)
- Genus Utterbackia F. C. Baker, 1927 (3)
- Genus Utterbackiana Frierson, 1927 (5)
- Tribe Cristariini Lopes-Lima, Bogan & Froufe, 2017 (64)
- 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