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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)
- Tribe Amblemini Rafinesque, 1820 (13)
- Tribe Lampsilini Ihering, 1901 (191)
- Tribe Pleurobemini Hannibal, 1912 (104)
- Genus Aximedia Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Genus Canthyria Swainson, 1840 accepted as Elliptio Rafinesque, 1819
- Genus Elliptio Rafinesque, 1819 (42)
- Genus Elliptoidens Frierson, 1927 accepted as Elliptoideus Frierson, 1927
- Genus Elliptoideus Frierson, 1927 (1)
- Genus Ensinaia Starobogatov, 1970 accepted as Elliptio Rafinesque, 1819
- Genus Eurynia Rafinesque, 1819 (2)
- Genus Fuscnoaia C. T. Simpson, 1900 accepted as Fusconaia C. T. Simpson, 1900
- Genus Fusconaia C. T. Simpson, 1900 (17)
- Genus Fusconaja C. T. Simpson, 1900 accepted as Fusconaia C. T. Simpson, 1900
- Genus Fusconala C. T. Simpson, 1900 accepted as Fusconaia C. T. Simpson, 1900
- Genus Fusconaria accepted as Fusconaia C. T. Simpson, 1900
- Genus Fusconia [sic] accepted as Fusconaia C. T. Simpson, 1900
- Genus Hemilastena Agassiz, 1852 accepted as Hemistena Rafinesque, 1820
- Genus Hemistena Rafinesque, 1820 (1)
- Genus Levingtonia [sic] accepted as Lexingtonia Ortmann, 1914
- Genus Lexingtonia Ortmann, 1914 accepted as Fusconaia C. T. Simpson, 1900
- Genus Lintoxia Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Genus Lyntoxia Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Genus Odatelia Rafinesque, 1832 accepted as Hemistena Rafinesque, 1820
- Genus Parvaspina Perkins, N. A. Johnson & Gangloff, 2017 (2)
- Genus Plethobasus C. T. Simpson, 1900 (5)
- Genus Pleurobema Rafinesque, 1819 (30)
- Subgenus Pleurobema (Lexingtonia) Ortmann, 1914 accepted as Fusconaia C. T. Simpson, 1900
- Subgenus Pleurobema (Plethobasus) C. T. Simpson, 1900 accepted as Plethobasus C. T. Simpson, 1900
- Subgenus Pleurobema (Pleurobema) Rafinesque, 1819 accepted as Pleurobema Rafinesque, 1819
- Subgenus Pleurobema (Sintoxia) Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Species Pleurobema abacus (Haldeman, 1842) accepted as Ptychobranchus fasciolaris (Rafinesque, 1820)
- Species Pleurobema acuens (I. Lea, 1871) accepted as Pleurobema oviforme (Conrad, 1834)
- Species Pleurobema aesopus (Green, 1827) accepted as Plethobasus cyphyus (Rafinesque, 1820)
- Species Pleurobema aldrichi Frierson, 1927 accepted as Pleurobema taitianum (I. Lea, 1834)
- Species Pleurobema aldrichianum Goodrich, 1931 accepted as Pleurobema hanleyianum (I. Lea, 1852)
- Species Pleurobema alixus (Dall, 1913) †
- Species Pleurobema altum (Conrad, 1854)
- Species Pleurobema amabile (I. Lea, 1865) accepted as Pleurobema pyriforme (I. Lea, 1857)
- Species Pleurobema anaticulus (I. Lea, 1861) accepted as Pleurobema decisum (I. Lea, 1831)
- Species Pleurobema appressa (I. Lea, 1871) accepted as Fusconaia cuneolus (I. Lea, 1840)
- Species Pleurobema appressum (I. Lea, 1871) accepted as Fusconaia cuneolus (I. Lea, 1840)
- Species Pleurobema argentea (I. Lea, 1841) accepted as Pleurobema oviforme (Conrad, 1834)
- Species Pleurobema argenteum (I. Lea, 1841) accepted as Pleurobema oviforme (Conrad, 1834)
- Species Pleurobema athearni Gangloff, J. D. Williams & Feminella, 2006
- Species Pleurobema avellana C. T. Simpson, 1900 accepted as Pleurobema rubellum (Conrad, 1834)
- Species Pleurobema avellanum (C. T. Simpson, 1900) accepted as Pleurobema rubellum (Conrad, 1834)
- Species Pleurobema barnesianum (I. Lea, 1838) accepted as Pleuronaia barnesiana (I. Lea, 1838)
- Species Pleurobema beadleanum (I. Lea, 1861) accepted as Pleurobema beadleianum (I. Lea, 1861)
- Species Pleurobema beadleianum (I. Lea, 1861)
- Species Pleurobema beadlianum (I. Lea, 1861) accepted as Pleurobema beadleianum (I. Lea, 1861)
- Species Pleurobema bigbyense (I. Lea, 1841) accepted as Pleuronaia barnesiana (I. Lea, 1838)
- Species Pleurobema bournianum (I. Lea, 1840) accepted as Pleurobema clava (Lamarck, 1819)
- Species Pleurobema breve (I. Lea, 1872) accepted as Pleurobema oviforme (Conrad, 1834)
- Species Pleurobema brevis (I. Lea, 1872) accepted as Pleurobema oviforme (Conrad, 1834)
- Species Pleurobema brimleyi (S. H. Wright, 1897) accepted as Fusconaia masoni (Conrad, 1834)
- Species Pleurobema brumbyanum (I. Lea, 1841) accepted as Ptychobranchus greenii (Conrad, 1834)
- Species Pleurobema bulbosum (I. Lea, 1857) accepted as Pleurobema pyriforme (I. Lea, 1857)
- Species Pleurobema bursapastoris (B. H. Wright, 1896) accepted as Fusconaia subrotunda (I. Lea, 1831)
- Species Pleurobema catillus (Conrad, 1836) accepted as Pleurobema sintoxia (Rafinesque, 1820)
- Species Pleurobema chattanogaense (I. Lea, 1858) accepted as Pleurobema decisum (I. Lea, 1831)
- Species Pleurobema chattanoogaense (I. Lea, 1858) accepted as Pleurobema decisum (I. Lea, 1831)
- Species Pleurobema chattanoogaensis (I. Lea, 1858) accepted as Pleurobema decisum (I. Lea, 1831)
- Species Pleurobema clava (Lamarck, 1819)
- Species Pleurobema clinchense (I. Lea, 1867) accepted as Pleurobema oviforme (Conrad, 1834)
- Species Pleurobema coccineum (Conrad, 1836) accepted as Pleurobema sintoxia (Rafinesque, 1820)
- Species Pleurobema collina (Conrad, 1837) accepted as Parvaspina collina (Conrad, 1837)
- Species Pleurobema conasaugaense (I. Lea, 1872) accepted as Pleurobema oviforme (Conrad, 1834)
- Species Pleurobema concolor (I. Lea, 1861) accepted as Pleurobema perovatum (Conrad, 1834)
- Species Pleurobema conradi Vanatta, 1915 accepted as Pleuronaia dolabelloides (I. Lea, 1840)
- Species Pleurobema cor (Conrad, 1834) accepted as Fusconaia cor (Conrad, 1834)
- Species Pleurobema cordata (Rafinesque, 1820) accepted as Pleurobema cordatum (Rafinesque, 1820)
- Species Pleurobema cordatum (Rafinesque, 1820)
- Subspecies Pleurobema cordatum catilla (Conrad, 1836) accepted as Pleurobema sintoxia (Rafinesque, 1820)
- Subspecies Pleurobema cordatum catillus (Conrad, 1836) accepted as Pleurobema sintoxia (Rafinesque, 1820)
- Subspecies Pleurobema cordatum coccineum (Conrad, 1836) accepted as Pleurobema sintoxia (Rafinesque, 1820)
- Subspecies Pleurobema cordatum cordatum (Rafinesque, 1820) accepted as Pleurobema cordatum (Rafinesque, 1820)
- Subspecies Pleurobema cordatum pauperculum (C. T. Simpson, 1900) accepted as Pleurobema sintoxia (Rafinesque, 1820)
- Subspecies Pleurobema cordatum plenum (I. Lea, 1840) accepted as Pleurobema plenum (I. Lea, 1840)
- Subspecies Pleurobema cordatum pyramidatum (I. Lea, 1831) accepted as Pleurobema rubrum (Rafinesque, 1820)
- Species Pleurobema crudum (I. Lea, 1871) accepted as Pleuronaia barnesiana (I. Lea, 1838)
- Species Pleurobema cryptorhynchus (C. A. White, 1877) †
- Species Pleurobema cuneata Rafinesque, 1820 accepted as Pleurobema clava (Lamarck, 1819)
- Species Pleurobema cuneolus (I. Lea, 1840) accepted as Fusconaia cuneolus (I. Lea, 1840)
- Species Pleurobema curtum (I. Lea, 1859)
- Species Pleurobema cyphyum (Rafinesque, 1820) accepted as Plethobasus cyphyus (Rafinesque, 1820)
- Species Pleurobema decisum (I. Lea, 1831)
- Species Pleurobema dolabelloides (I. Lea, 1840) accepted as Pleuronaia dolabelloides (I. Lea, 1840)
- Species Pleurobema dowlingi (McLearn, 1919) †
- Species Pleurobema dyeri L. S. Russell, 1967 †
- Species Pleurobema edgarianum (I. Lea, 1840) accepted as Fusconaia cor (Conrad, 1834)
- Species Pleurobema estabrookiana (I. Lea, 1845) accepted as Pleuronaia barnesiana (I. Lea, 1838)
- Species Pleurobema estabrookianum (I. Lea, 1845) accepted as Pleuronaia barnesiana (I. Lea, 1838)
- Species Pleurobema fassinans (I. Lea, 1868) accepted as Pleuronaia barnesiana (I. Lea, 1838)
- Species Pleurobema favosum (I. Lea, 1856) accepted as Pleurobema georgianum (I. Lea, 1841)
- Species Pleurobema fibuloides (I. Lea, 1859)
- Species Pleurobema fictum Frierson, 1927 accepted as Pleurobema rubellum (Conrad, 1834)
- Species Pleurobema flavidulum (I. Lea, 1861) accepted as Pleurobema perovatum (Conrad, 1834)
- Species Pleurobema friersoni (B. H. Wright, 1896) accepted as Pleurobema riddellii (I. Lea, 1862)
- Species Pleurobema furvum (Conrad, 1834) accepted as Pleurobema rubellum (Conrad, 1834)
- Species Pleurobema georgianmum (I. Lea, 1841) accepted as Pleurobema georgianum (I. Lea, 1841)
- Species Pleurobema georgianum (I. Lea, 1841)
- Species Pleurobema gibbera (I. Lea, 1838) accepted as Pleuronaia gibber (I. Lea, 1838)
- Species Pleurobema gibberum (I. Lea, 1838) accepted as Pleuronaia gibber (I. Lea, 1838)
- Species Pleurobema gloria Martinson, Barsbold & Tolstikova, 1975 †
- Species Pleurobema hagleri (Frierson, 1900) accepted as Pleurobema rubellum (Conrad, 1834)
- Species Pleurobema hanleyanum (I. Lea, 1852) accepted as Pleurobema hanleyianum (I. Lea, 1852)
- Species Pleurobema hanleyianum (I. Lea, 1852)
- Species Pleurobema harperi (B. H. Wright, 1899) accepted as Pleurobema pyriforme (I. Lea, 1857)
- Species Pleurobema hartmanianum (I. Lea, 1860)
- Species Pleurobema holstonense (I. Lea, 1840) accepted as Pleurobema oviforme (Conrad, 1834)
- Species Pleurobema humei (Dyer, 1930) †
- Species Pleurobema instructum (I. Lea, 1861) accepted as Pleurobema verum (I. Lea, 1861)
- Species Pleurobema interventum (I. Lea, 1861) accepted as Pleurobema perovatum (Conrad, 1834)
- Species Pleurobema irrasum (I. Lea, 1861) accepted as Pleurobema georgianum (I. Lea, 1841)
- Species Pleurobema johannis (I. Lea, 1859) accepted as Pleurobema perovatum (Conrad, 1834)
- Species Pleurobema lenticulare (I. Lea, 1872) accepted as Pleuronaia barnesiana (I. Lea, 1838)
- Species Pleurobema lesleyi (I. Lea, 1860) accepted as Pleurobema oviforme (Conrad, 1834)
- Species Pleurobema lewisii (I. Lea, 1861) accepted as Pleurobema fibuloides (I. Lea, 1859)
- Species Pleurobema litum (I. Lea, 1871) accepted as Pleurobema pyriforme (I. Lea, 1857)
- Species Pleurobema maculatum (Conrad, 1834) accepted as Pleuronaia dolabelloides (I. Lea, 1840)
- Species Pleurobema marshalli Frierson, 1927
- Species Pleurobema meredithi (I. Lea, 1858) accepted as Pleuronaia barnesiana (I. Lea, 1838)
- Species Pleurobema meredithii (I. Lea, 1858) accepted as Pleuronaia barnesiana (I. Lea, 1838)
- Species Pleurobema missouriensis W. A. Marsh, 1901 accepted as Pleurobema sintoxia (Rafinesque, 1820)
- Species Pleurobema modicum (I. Lea, 1857) accepted as Pleurobema pyriforme (I. Lea, 1857)
- Species Pleurobema murrayense (I. Lea, 1868) accepted as Pleurobema stabile (I. Lea, 1861)
- Species Pleurobema mytiloides Rafinesque, 1820 accepted as Pleurobema clava (Lamarck, 1819)
- Species Pleurobema nucleopse (Conrad, 1849) accepted as Pleurobema georgianum (I. Lea, 1841)
- Species Pleurobema nucleopsis (Conrad, 1849) accepted as Pleurobema georgianum (I. Lea, 1841)
- Species Pleurobema nux (I. Lea, 1852) accepted as Pleurobema perovatum (Conrad, 1834)
- Species Pleurobema obliquata (Rafinesque, 1820) accepted as Epioblasma obliquata (Rafinesque, 1820)
- Species Pleurobema obliquum (Lamarck, 1819) accepted as Pleurobema cordatum (Rafinesque, 1820)
- Species Pleurobema ornatum (I. Lea, 1861) accepted as Pleuronaia barnesiana (I. Lea, 1838)
- Species Pleurobema oviforme (Conrad, 1834)
- Species Pleurobema patsaligensis C. T. Simpson, 1900 accepted as Pleurobema strodeanum (B. H. Wright, 1898)
- Species Pleurobema perovatum (Conrad, 1834)
- Species Pleurobema pinkstonii (S. H. Wright, 1897) accepted as Pleurobema perovatum (Conrad, 1834)
- Species Pleurobema planius (I. Lea, 1868) accepted as Pleurobema oviforme (Conrad, 1834)
- Species Pleurobema plenum (I. Lea, 1840)
- Species Pleurobema proavitum (C. A. White, 1877) †
- Species Pleurobema pudicum (I. Lea, 1860) accepted as Pleuronaia barnesiana (I. Lea, 1838)
- Species Pleurobema pullus (Conrad, 1838) accepted as Toxolasma pullum (Conrad, 1838)
- Species Pleurobema pulvinulum (I. Lea, 1845) accepted as Pleurobema rubellum (Conrad, 1834)
- Species Pleurobema pyramidata (I. Lea, 1831) accepted as Pleurobema rubrum (Rafinesque, 1820)
- Species Pleurobema pyramidatum (I. Lea, 1831) accepted as Pleurobema rubrum (Rafinesque, 1820)
- Species Pleurobema pyriforme (I. Lea, 1857)
- Species Pleurobema ravenelianum (I. Lea, 1834) accepted as Pleurobema oviforme (Conrad, 1834)
- Species Pleurobema reclusum (B. H. Wright, 1898) accepted as Pleurobema pyriforme (I. Lea, 1857)
- Species Pleurobema riddellii (I. Lea, 1862)
- Species Pleurobema rubellum (Conrad, 1834)
- Species Pleurobema rubrum (Rafinesque, 1820) accepted as Pleurobema sintoxia (Rafinesque, 1820)
- Species Pleurobema showalteri (I. Lea, 1860) accepted as Pleurobema showalterii (I. Lea, 1860)
- Species Pleurobema showalterii (I. Lea, 1860) accepted as Pleurobema hartmanianum (I. Lea, 1860)
- Species Pleurobema similans (I. Lea, 1871) accepted as Pleurobema perovatum (Conrad, 1834)
- Species Pleurobema simpsoni Vanatta, 1915 accepted as Pleurobema pyriforme (I. Lea, 1857)
- Species Pleurobema simulans (I. Lea, 1871) accepted as Pleurobema perovatum (Conrad, 1834)
- Species Pleurobema sintoxia (Rafinesque, 1820)
- Species Pleurobema sinzovi (Bogachev, 1924) †
- Species Pleurobema stabile (I. Lea, 1861)
- Species Pleurobema stabilis (I. Lea, 1861) accepted as Pleurobema stabile (I. Lea, 1861)
- Species Pleurobema stramineum (Conrad, 1834) accepted as Lampsilis straminea (Conrad, 1834)
- Species Pleurobema striatissima (J. G. Anthony, 1865) accepted as Pleurobema oviforme (Conrad, 1834)
- Species Pleurobema striatulum (I. Lea, 1857) accepted as Fusconaia masoni (Conrad, 1834)
- Species Pleurobema striatum (I. Lea, 1840) accepted as Pleurobema pyriforme (I. Lea, 1857)
- Species Pleurobema strodeanum (B. H. Wright, 1898)
- Species Pleurobema subplanum (Conrad, 1837) accepted as Fusconaia masoni (Conrad, 1834)
- Species Pleurobema swordianum (S. H. Wright, 1897) accepted as Pleurobema oviforme (Conrad, 1834)
- Species Pleurobema taitianum (I. Lea, 1834)
- Species Pleurobema tarda Tolstikova, 1975 †
- Species Pleurobema tesserulae (I. Lea, 1862) accepted as Pleurobema oviforme (Conrad, 1834)
- Species Pleurobema tombigbeanum Frierson, 1908 accepted as Pleurobema taitianum (I. Lea, 1834)
- Species Pleurobema troschelianum (I. Lea, 1853) accepted as Pleurobema georgianum (I. Lea, 1841)
- Species Pleurobema tumescens (I. Lea, 1845) accepted as Pleuronaia barnesiana (I. Lea, 1838)
- Species Pleurobema tuscumbiense (I. Lea, 1871) accepted as Fusconaia cuneolus (I. Lea, 1840)
- Species Pleurobema tuscumbiensis (I. Lea, 1871) accepted as Fusconaia cuneolus (I. Lea, 1840)
- Species Pleurobema utriculum (I. Lea, 1845) accepted as Fusconaia masoni (Conrad, 1834)
- Species Pleurobema utterbackii Frierson, 1915 accepted as Fusconaia ozarkensis (Call, 1887)
- Species Pleurobema validum (I. Lea, 1871) accepted as Pleuronaia barnesiana (I. Lea, 1838)
- Species Pleurobema verum (I. Lea, 1861)
- Genus Pleuronaia Frierson, 1927 (4)
- Genus Quincuncina Ortmann, 1922 accepted as Fusconaia C. T. Simpson, 1900
- Genus Sayunio De Gregorio, 1914 accepted as Hemistena Rafinesque, 1820
- Genus Scalenaria Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Genus Scatenaria Rafinesque, 1820 accepted as Scalenaria Rafinesque, 1820
- Genus Sintoina Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Genus Sintoxia Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Genus Syntonia Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Genus Syntoxia Agassiz, 1846 accepted as Pleurobema Rafinesque, 1819
- Tribe Popenaiadini Heard & Guckert, 1971 (69)
- Tribe Quadrulini Ihering, 1901 (51)
- Genus Symphinota [sic] accepted as Symphynota I. Lea, 1829
- Genus Symphonota [sic] accepted as Symphynota I. Lea, 1829
- 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)
- 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
