Between brackets is the number of accepted species

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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)
- 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)
- Genus Cylindrica C. T. Simpson, 1900 accepted as Lanceolaria Conrad, 1853
- Genus Lanceolaria Conrad, 1853 (22)
- Subgenus Lanceolaria (Pericylindrica) Tomlin, 1930 accepted as Lanceolaria Conrad, 1853
- Species Lanceolaria (Pericylindrica) bogatovi Zatravkin & Starobogatov, 1984 accepted as Lanceolaria grayii (J. E. Gray, 1833)
- Species Lanceolaria (Pericylindrica) curta Chepalyga, 1971 † accepted as Lanceolaria curta Chepalyga, 1971 †
- Species Lanceolaria (Pericylindrica) subcylindrica Martinson, 1956 † accepted as Lanceolaria subcylindrica Martinson, 1956 †
- Subgenus Lanceolaria (Prolanceolaria) Moskvicheva, 1973 accepted as Lanceolaria Conrad, 1853
- Species Lanceolaria acrorrhyncha (E. von Martens, 1894)
- Species Lanceolaria angustata Martinson, 1965 †
- Species Lanceolaria bilirata (E. von Martens, 1902)
- Species Lanceolaria bogani Thach, 2016
- Species Lanceolaria bogatovi Zatravkin & Starobogatov, 1984 accepted as Lanceolaria (Pericylindrica) bogatovi Zatravkin & Starobogatov, 1984
- Species Lanceolaria chankensis Moskvicheva, 1973 accepted as Lanceolaria grayii (J. E. Gray, 1833)
- Species Lanceolaria comptocosta Lee †
- Species Lanceolaria convexa B.-Y. Huang & J.-M. Wei, 1976 †
- Species Lanceolaria curta Chepalyga, 1971 †
- Species Lanceolaria cylindracea (C. T. Simpson, 1900) accepted as Lanceolaria grayii (J. E. Gray, 1833)
- Species Lanceolaria eucylindrica C.-T. Lin, 1962
- Species Lanceolaria eximidonta Maderni, 1964 †
- Species Lanceolaria fangcunensis B.-Y. Huang & J.-H. Chen, 1980 †
- Species Lanceolaria fruhstorferi (Dautzenberg, 1900)
- Species Lanceolaria fusongensis G.-X. Zhu, 1980 †
- Species Lanceolaria gladiola (Heude, 1877)
- Species Lanceolaria grayana (I. Lea, 1834) accepted as Lanceolaria grayii (J. E. Gray, 1833)
- Species Lanceolaria grayii (J. E. Gray, 1833)
- Species Lanceolaria hosonoi (K. Suzuki & Oyama, 1948) †
- Species Lanceolaria indricora (Bogachev, 1961) †
- Species Lanceolaria kihirai T. Kondo & Hattori, 2019
- Species Lanceolaria laevis (E. von Martens, 1902)
- Species Lanceolaria lanceolata (I. Lea, 1856)
- Species Lanceolaria maacki Moskvicheva, 1973 accepted as Lanceolaria grayii (J. E. Gray, 1833)
- Species Lanceolaria onariotis (C. Mayer, 1869) † accepted as Plesielliptio onariotis (C. Mayer, 1869) †
- Species Lanceolaria oxyrhyncha (E. von Martens, 1861)
- Species Lanceolaria paracylindrica Z.-W. Gu, 1998 †
- Species Lanceolaria pisciformis (Yokoyama, 1932) †
- Species Lanceolaria sakaii K. Suzuki, 1942 † accepted as Cuneopsis sakaii (K. Suzuki, 1942) †
- Species Lanceolaria subcylindrica Martinson, 1956 †
- Species Lanceolaria triformis (Heude, 1877)
- Species Lanceolaria ussuriensis Moskvicheva, 1973 accepted as Lanceolaria grayii (J. E. Gray, 1833)
- Species Lanceolaria yueyingae J. He & Z. Zhuang, 2013 accepted as Lanceolaria eucylindrica C.-T. Lin, 1962
- Genus Pericylindrica Tomlin, 1930 accepted as Lanceolaria Conrad, 1853
- Genus Triquetra Mörch, 1853 accepted as Lanceolaria Conrad, 1853
- 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 (6 644)
- 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