Between brackets is the number of accepted species

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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)
- 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)
- 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)
- Genus Arcuneopsis X.-C. Huang, Y.-T. Dai & X.-P. Wu, 2022 accepted as Tchangsinaia Starobogatov, 1970
- Genus Cuneopsis C. T. Simpson, 1900 (76)
- Genus Inversiunio T. Habe, 1991 (4)
- Genus Nodularia Conrad, 1853 (41)
- Subgenus Nodularia (Amurunio) Zatravkin & Starobogatov, 1987 accepted as Nodularia Conrad, 1853
- Subgenus Nodularia (Cafferia) C. T. Simpson, 1900 accepted as Cafferia C. T. Simpson, 1900
- Subgenus Nodularia (Coelatura) Conrad, 1853 accepted as Caelatura 'Conrad, 1853'
- Subgenus Nodularia (Cylindrica) C. T. Simpson, 1900 accepted as Cylindrica C. T. Simpson, 1900
- Subgenus Nodularia (Inversidens) F. Haas, 1911 accepted as Inversidens F. Haas, 1911
- Subgenus Nodularia (Lanceolaria) Conrad, 1853 accepted as Lanceolaria Conrad, 1853
- Subgenus Nodularia (Magadaninaia) Martynov & Chernyshev, 1992 accepted as Nodularia Conrad, 1853
- Subgenus Nodularia (Nodularia) Conrad, 1853 accepted as Nodularia Conrad, 1853
- Subgenus Nodularia (Radiatula) C. T. Simpson, 1900 accepted as Radiatula C. T. Simpson, 1900
- Subgenus Nodularia (Scabies) F. Haas, 1911 accepted as Scabies F. Haas, 1911
- Species Nodularia akbaurensis Maderni, 1974 †
- Species Nodularia amurensis (Mousson, 1887) accepted as Nodularia douglasiae (J. E. Gray, 1833)
- Species Nodularia baibishensis (Martinson, 1990) †
- Species Nodularia bersenevi (Popova, 1963) †
- Species Nodularia betekeiensis (Lindholm, 1932) † accepted as Sibirunio betekeiensis (Lindholm, 1932) †
- Species Nodularia breviconcha J. H. Lee, S. K. Kim, Bogan & T. Kondo, 2020
- Species Nodularia cariei Germain, 1919 accepted as Coelatura aegyptiaca (Cailliaud, 1823)
- Species Nodularia continentalis F. Haas, 1910 accepted as Inversidens pantoensis (Neumayr, 1899)
- Species Nodularia croninae B. Walker, 1922 accepted as Leoparreysia tavoyensis (A. Gould, 1843)
- Species Nodularia cunhatia S. Schneider, 2013 †
- Species Nodularia cylindracea C. T. Simpson, 1900
- Species Nodularia cylindrica [sic] accepted as Nodularia cylindracea C. T. Simpson, 1900
- Species Nodularia denserugata F. Haas, 1910
- Species Nodularia diespiter (Mabille, 1887)
- Species Nodularia distinguenda (Lindholm, 1932) †
- Species Nodularia dorri (Wattebled, 1886)
- Species Nodularia douglasiae (J. E. Gray, 1833)
- Species Nodularia dualobtusus R. Wu & L. Liu, 2024
- Species Nodularia extremalis Martynov & Chernyshev, 1992 accepted as Nodularia douglasiae (J. E. Gray, 1833)
- Species Nodularia falsiunio Popova & Starobogatov, 1970 †
- Species Nodularia ferrata (Tolstikova, 1976) †
- Species Nodularia firmusoides (Martinson, 1951) †
- Species Nodularia fischeriania C. T. Simpson, 1900 accepted as Contradens contradens (I. Lea, 1838)
- Species Nodularia fossilis (Martinson, 1951) †
- Species Nodularia fusiformans R. Wu & L. Liu, 2024
- Species Nodularia gladiator (Ancey, 1881)
- Species Nodularia guiensis K.Y. Hou & R.W. Wu, 2025
- Species Nodularia hanensis R. Wu & L. Liu, 2024
- Species Nodularia hirasei F. Haas, 1911 accepted as Inversiunio reinianus (Kobelt, 1879)
- Species Nodularia huana R. Wu & L. Liu, 2024
- Species Nodularia jourdyi (Morlet, 1886) accepted as Nodularia douglasiae (J. E. Gray, 1833)
- Species Nodularia kenderleica Maderni, 1964 †
- Species Nodularia kizylaigirensis (Lindholm, 1932) †
- Subspecies Nodularia kizylaigirensis tuvaensis Popova, 1968 † accepted as Ptychorhynchus tuvaensis (Popova, 1968) †
- Species Nodularia lapedosa (Tolstikova, 1976) †
- Species Nodularia lebedevi Zatravkin & Starobogatov, 1984 accepted as Nodularia douglasiae (J. E. Gray, 1833)
- Species Nodularia lindholmi Chepalyga, 1971 †
- Species Nodularia lungershauseni Popova & Starobogatov, 1970 †
- Species Nodularia madernyi Popova & Starobogatov, 1970 †
- Species Nodularia micheloti (Morlet, 1886)
- Species Nodularia middendorffi (Westerlund, 1890) accepted as Nodularia douglasiae (J. E. Gray, 1833)
- Species Nodularia moskvichevae Bogatov & Starobogatov, 1992 accepted as Nodularia douglasiae (J. E. Gray, 1833)
- Species Nodularia mugodjarica (Bogachev, 1961) †
- Species Nodularia nipponensis (E. von Martens, 1877)
- Species Nodularia nuxpersicae (Dunker, 1848)
- Species Nodularia orientalis (I. Lea, 1840) accepted as Elongaria orientalis (I. Lea, 1840)
- Species Nodularia oviformis (Popova, 1964) †
- Species Nodularia paradouglasiae Popova, 1981 †
- Species Nodularia parcedentata F. Haas, 1911 accepted as Inversidens brandtii (Kobelt, 1879)
- Species Nodularia pazii (I. Lea, 1862) accepted as Ensidens ingallsianus (I. Lea, 1852)
- Species Nodularia persculpta F. Haas, 1910
- Species Nodularia petrovski (Popova, 1963) †
- Species Nodularia petrovskyi [sic] † accepted as Nodularia petrovski (Popova, 1963) †
- Species Nodularia pisciformis Yokoyama, 1932 † accepted as Lanceolaria pisciformis (Yokoyama, 1932) †
- Species Nodularia prigorovskii (Bogachev, 1961) †
- Species Nodularia pseudodistorta (Martinson, 1951) †
- Species Nodularia pugiuncula (Blanford, 1883) †
- Species Nodularia rohani Germain, 1925 accepted as Coelatura kunenensis (Mousson, 1888)
- Species Nodularia rustica (I. Lea, 1856) accepted as Lens contradens (I. Lea, 1838)
- Species Nodularia sainshandica (Barsbold, 1972) †
- Species Nodularia sakhalinensis Bogatov, 2001 accepted as Nodularia douglasiae (J. E. Gray, 1833)
- Species Nodularia sibirica (Popova & Starobogatov, 1970) †
- Species Nodularia sobaensis Preston, 1914 accepted as Coelatura aegyptiaca (Cailliaud, 1823)
- Species Nodularia sobolus C. T. Simpson, 1900 accepted as Contradens contradens (I. Lea, 1838)
- Species Nodularia subdactylina (Martinson, 1951) †
- Species Nodularia subjapanensis Yokoyama, 1932 † accepted as Anodonta subjapanensis (Yokoyama, 1932) †
- Species Nodularia subplanatus (Lindholm, 1932) † accepted as Unio subplanatus Lindholm, 1932 †
- Species Nodularia subsculpta (Martinson & Tolstikova, 1969) †
- Species Nodularia sujfunica Moskvicheva, 1973 accepted as Nodularia douglasiae (J. E. Gray, 1833)
- Species Nodularia transrhyphaea (Bogachev, 1924) †
- Species Nodularia tumidula (I. Lea, 1856) accepted as Lens contradens (I. Lea, 1838)
- Species Nodularia undulata F. Haas, 1910
- Species Nodularia vitiensis A. M. Davies, 1927 † accepted as Mactra (Mactrotoma) vitiensis (A. M. Davies, 1927) †
- Species Nodularia vladivostokensis Moskvicheva, 1973 accepted as Nodularia douglasiae (J. E. Gray, 1833)
- Genus Pseudocuneopsis X.-C. Huang, Y.-T. Dai & X.-P. Wu, 2022 (5)
- Genus Schistodesmus C. T. Simpson, 1900 (9)
- Genus Tchangsinaia Starobogatov, 1970 (6)
- 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 (6 658)
- 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