Between brackets is the number of accepted species

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- Mollusca (133 273)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 082)
- Subclass Autobranchia (23 354)
- Infraclass Heteroconchia (16 678)
- Subterclass Archiheterodonta (1 212)
- Subterclass Euheterodonta (11 391)
- Subterclass Heterodonta
- Subterclass Palaeoheterodonta (4 074)
- Order Trigoniida (1 482)
- Order Unionida (2 581)
- 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 (2 419)
- 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)
- Subfamily Cumberlandiinae Heard & Guckert, 1970 accepted as Margaritiferidae J. Henderson, 1929 (1910)
- Subfamily Gibbosulinae Bogan, Bolotov, Froufe & Lopes-Lima, 2018 (9)
- Subfamily Margaritiferinae J. Henderson, 1929 (1910) (64)
- Genus Asturianaia Delvene, Munt, Piñuela & García-Ramos, 2016 † (3)
- Genus Cumberlandia Ortmann, 1912 (3)
- Genus Dahurinaia Starobogatov, 1970 accepted as Margaritifera Schumacher, 1815
- Genus Kurilinaia Zatravkin & Bogatov, 1988 accepted as Margaritifera Schumacher, 1815
- Genus Margaritana Schumacher, 1817 accepted as Margaritifera Schumacher, 1815
- Genus Margaritifera Schumacher, 1815 (46)
- Subgenus Margaritifera (Cumberlandia) Ortmann, 1912 accepted as Cumberlandia Ortmann, 1912
- Subgenus Margaritifera (Margaritanopsis) F. Haas, 1910 accepted as Margaritifera Schumacher, 1815
- Subgenus Margaritifera (Margaritifera) Schumacher, 1815 accepted as Margaritifera Schumacher, 1815
- Subgenus Margaritifera (Mengyinaia) J.-H. Chen, 1984 †
- Subgenus Margaritifera (Palaeomargaritifera) Q.-H. Ma, 1984 † accepted as Palaeomargaritifera Q.-H. Ma, 1984 †
- Subgenus Margaritifera (Pseudounio) [sic] accepted as Pseudunio F. Haas, 1910
- Subgenus Margaritifera (Pseudunio) F. Haas, 1910 accepted as Pseudunio F. Haas, 1910
- Subgenus Margaritifera (Qiyangia) J.-H. Chen & Y.-M. Xu, 1980 † accepted as Qiyangia J.-H. Chen & Y.-M. Xu, 1980 †
- Species Margaritifera antiqua Z.-W. Gu & J.-S. Yu, 1976 † accepted as Palaeomargaritifera antiqua (Z.-W. Gu & J.-S. Yu, 1976) †
- Species Margaritifera arca Chepalyga, 1964 †
- Species Margaritifera argillacea Tolstikova, 1976 †
- Species Margaritifera argillaceus Tolstikova, 1976 † accepted as Margaritifera argillacea Tolstikova, 1976 †
- Species Margaritifera auricularia (Spengler, 1793) accepted as Pseudunio auricularius (Spengler, 1793)
- Species Margaritifera baicalica Popova, 1964 †
- Species Margaritifera baichengensis (Z.-W. Gu, 1976) †
- Species Margaritifera baumbergeri Modell, 1938 † accepted as Pseudunio baumbergeri (Modell, 1938) †
- Species Margaritifera borealis (Westerlund, 1871) accepted as Margaritifera (Margaritifera) margaritifera (Linnaeus, 1758)
- Species Margaritifera cardiidae [sic]
- Species Margaritifera condoni (C. A. White, 1885) †
- Species Margaritifera crestata J.-M. Wei, 1984 † accepted as Palaeomargaritifera manasensis (J.-M. Wei, 1984) †
- Species Margaritifera crosthwaitei (R. B. Newton, 1909) †
- Species Margaritifera dahurica (Middendorff, 1850)
- Species Margaritifera dazhuensis X.-Z. Liu, 1984 †
- Species Margaritifera decumbens (I. Lea, 1861) accepted as Elliptio complanata ([Lightfoot], 1786)
- Species Margaritifera delunshanensis J.-M. Wei, 1984 † accepted as Palaeomargaritifera isfarensis (B. I. Chernyshev, 1937) †
- Species Margaritifera deviatkini Chepalyga, 1971 †
- Species Margaritifera distorta (W. Bean, 1836) †
- Species Margaritifera durrovensis R. A. Phillips, 1928 accepted as Margaritifera margaritifera (Linnaeus, 1758)
- Species Margaritifera elongata (Martinson, 1982) †
- Species Margaritifera elongata (Lamarck, 1819) accepted as Margaritifera (Margaritifera) margaritifera (Linnaeus, 1758)
- Species Margaritifera endlichi (C. A. White, 1877) †
- Species Margaritifera falcata (A. Gould, 1850)
- Species Margaritifera flabellata (Goldfuss, 1837) † accepted as Pseudunio flabellatus (Goldfuss, 1837) †
- Species Margaritifera flabellatiformis (Grigorovich-Beresovskiy, 1915) † accepted as Pseudunio flabellatiformis (Grigorovich-Beresovskiy, 1915) †
- Species Margaritifera flabellifera (Noulet, 1846) † accepted as Margaritifera flabellata (Goldfuss, 1837) †
- Species Margaritifera fluviatilis Schumacher, 1815 accepted as Margaritifera margaritifera (Linnaeus, 1758)
- Species Margaritifera fortis (J.-H. Chen & Y.-M. Xu, 1980) †
- Species Margaritifera gerberi Modell, 1934 †
- Species Margaritifera geyeri Modell, 1931 †
- Subspecies Margaritifera geyeri geyeri Modell, 1931 †
- Subspecies Margaritifera geyeri miesbachensis Modell, 1935 †
- Species Margaritifera glabra (C. M. Kolesnikov, 1956) †
- Species Margaritifera guanyintanensis C.-W. Xiong & S.-Y. Wang, 1979 † accepted as Unio uralensis B. I. Chernyshev, 1937 †
- Species Margaritifera hantkeni Modell, 1950 †
- Species Margaritifera haushamensis Modell, 1931 †
- Species Margaritifera hembeli (Conrad, 1838)
- Species Margaritifera herrei (Hannibal, 1912) †
- Species Margaritifera homsensis (I. Lea, 1865) accepted as Pseudunio homsensis (I. Lea, 1865)
- Species Margaritifera huadongensis Q.-H. Ma, 1980 †
- Species Margaritifera idubedae (Palacios & R. Sánchez, 1885) † accepted as Paraheudeana idubedae (Palacios & R. Sánchez, 1885) †
- Species Margaritifera inaequiradiata (Gümbel, 1861) †
- Species Margaritifera isfarensis (B. I. Chernyshev, 1937) † accepted as Palaeomargaritifera isfarensis (B. I. Chernyshev, 1937) †
- Species Margaritifera kamtschatica Chepalyga, 1976 †
- Species Margaritifera kurilensis (Zatravkin & Starobogatov, 1984)
- Species Margaritifera laevis (F. Haas, 1910)
- Species Margaritifera lagriega Delvene, Munt, Piñuela & García-Ramos, 2016 †
- Species Margaritifera laosensis (I. Lea, 1863) accepted as Gibbosula laosensis (I. Lea, 1863)
- Species Margaritifera lufengensis (Q.-H. Ma, 1976) †
- Species Margaritifera margaritifera (Linnaeus, 1758)
- Species Margaritifera marocana (Pallary, 1918) accepted as Pseudunio marocanus (Pallary, 1918)
- Species Margaritifera marrianae R. I. Johnson, 1983
- Species Margaritifera martinsoni Modell, 1964 † accepted as Margaritifera baicalica Popova, 1964 †
- Species Margaritifera mengyinensis (Grabau, 1923) † accepted as Mengyinaia mengyinensis (Grabau, 1923) †
- Species Margaritifera menkei (F. C. L. Koch & Dunker, 1837) †
- Species Margaritifera middendorffi (Rosén, 1926) accepted as Margaritifera laevis (F. Haas, 1910)
- Species Margaritifera monodonta (Say, 1829) accepted as Cumberlandia monodonta (Say, 1829)
- Species Margaritifera nanshanensis (Q.-H. Ma, 1984) †
- Species Margaritifera nebrascensis (Meek, 1871) † accepted as Amblema nebrascensis (Meek, 1871) †
- Species Margaritifera occulta Maderni, 1972 †
- Species Margaritifera onariotis (C. Mayer, 1869) † accepted as Plesielliptio onariotis (C. Mayer, 1869) †
- Species Margaritifera otatumei K. Suzuki, 1942 †
- Species Margaritifera owadaensis Noda, 1970 †
- Species Margaritifera perdahurica (Yokoyama, 1932) †
- Species Margaritifera plana (Q.-H. Ma, 1996) †
- Species Margaritifera praedahurica Chepalyga, 1971 †
- Species Margaritifera praesachalinensis Chepalyga, 1976 †
- Species Margaritifera pucici (Brusina, 1902) †
- Species Margaritifera pujiangensis (Q.-H. Ma, 1996) †
- Species Margaritifera pujiangensis (Q.-H. Ma, 1980) †
- Species Margaritifera qiyangensis C.-W. Xiong & S.-Y. Wang, 1979 † accepted as Palaeomargaritifera isfarensis (B. I. Chernyshev, 1937) †
- Species Margaritifera rochechouartii (Heude, 1875) accepted as Gibbosula rochechouartii (Heude, 1875)
- Species Margaritifera sainshandensis (Martinson, 1982) †
- Species Margaritifera schneideri Modell, 1931 †
- Species Margaritifera shanxiensis J.-S. Yu, 1984 † accepted as Palaeomargaritifera isfarensis (B. I. Chernyshev, 1937) †
- Species Margaritifera sichuanensis X.-Z. Liu, 1984 † accepted as Palaeomargaritifera guangyuanensis (Q.-H. Ma, 1984) †
- Species Margaritifera sinopae (T. D. A. Cockerell, 1915) †
- Species Margaritifera subflabellata (Rollier, 1910) †
- Species Margaritifera tanggulaensis (S.-X. Wen, 1979) †
- Species Margaritifera togakushiensis T. Kondo & O. Kobayashi, 2005 accepted as Margaritifera kurilensis (Zatravkin & Starobogatov, 1984)
- Species Margaritifera tugriensis [sic] † accepted as Mengyinaia tugrigensis (Martinson, 1961) †
- Species Margaritifera tugrigensis (Martinson, 1961) † accepted as Mengyinaia tugrigensis (Martinson, 1961) †
- Species Margaritifera valdensis (Mantell, 1844) †
- Species Margaritifera vicaryi (Blanford, 1883) † accepted as Indobaphia vicaryi (Blanford, 1883) †
- Species Margaritifera xuanhanensis (Q.-H. Ma, 1996) †
- Species Margaritifera yangbiensis Q.-H. Ma, 1976 † accepted as Palaeomargaritifera yangbiensis (Q.-H. Ma, 1976) †
- Species Margaritifera zhejiangensis (Q.-H. Ma, 1996) †
- Species Margaritifera zhungarica J.-M. Wei, 1984 † accepted as Unio uralensis B. I. Chernyshev, 1937 †
- Genus Paraheudeana Starobogatov, 1970 † (1)
- Genus Potodoma Herrmannsen, 1846 accepted as Margaritifera Schumacher, 1815
- Genus Pseudunio F. Haas, 1910 (11)
- Genus Schalienaia Starobogatov, 1970 accepted as Margaritifera Schumacher, 1815
- Genus Damalis Leach, 1847 accepted as Margaritifera Schumacher, 1815
- Genus Dianoconcha F.-X. Guo, 1988 †
- Genus Discunio Starobogatov, 1970 † (1)
- Genus Hungaramblema Starobogatov, 1970 † accepted as Margaritifera Schumacher, 1815
- Genus Itatia Starobogatov, 1970 † (1)
- Genus Margaritinopsis accepted as Margaritanopsis F. Haas, 1910
- Genus Margartifera Schumacher, 1815 accepted as Margaritifera Schumacher, 1815
- Genus Margatifera accepted as Margaritifera Schumacher, 1815
- Genus Martinsoniconcha Starobogatov, 1970 † (3)
- Genus Mengyinaia J.-H. Chen, 1984 †
- Genus Palaeomargaritifera Q.-H. Ma, 1984 † (7)
- Genus Plicatibaphia Starobogatov, 1970 † accepted as Pseudunio F. Haas, 1910 (1)
- Genus Proarcidopsis Starobogatov, 1970 † (5)
- Genus Promargaritifera "F. R. Woodward, 1994" †
- Genus Pseudomargaritifera Q.-H. Ma, 1996 † accepted as Margaritifera Schumacher, 1815
- Genus Shifangella X.-Z. Liu & Q.-H. Luo, 1981 † (2)
- Genus Solenaiaoides †
- Genus Solenoides Q.-H. Ma, 1996 † accepted as Margaritifera Schumacher, 1815
- Genus Valdensia "F. R. Woodward, 1994" †
- 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 (2 174)
- 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 (6 676)
- Subclass Bivalvia incertae sedis (7)
- Subclass Palaeotaxodonta accepted as Nuculida
- Subclass Paleoheterodonta accepted as Palaeoheterodonta
- Subclass Protobranchia (1 379)
- Infraclass Cryptodonta † (342)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 018)
- 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 (1 381)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (753)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata