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)
- 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
- Subgenus Margaritana (Cumberlandia) accepted as Cumberlandia Ortmann, 1912
- Subgenus Margaritana (Heudeana) Frierson, 1922 accepted as Ptychorhynchus C. T. Simpson, 1900
- Subgenus Margaritana (Margaritiferana) Fagot, 1893 accepted as Margaritifera Schumacher, 1815
- Subgenus Margaritana (Pseudunio) F. Haas, 1910 accepted as Pseudunio F. Haas, 1910
- Species Margaritana alabamensis I. Lea, 1861 accepted as Pseudodontoideus connasaugaensis (I. Lea, 1858)
- Species Margaritana arcula I. Lea, 1838 accepted as Alasmidonta arcula (I. Lea, 1838)
- Species Margaritana astensis Sacco, 1886 † accepted as Pseudodon astensis (Sacco, 1886) †
- Species Margaritana auricularia (Spengler, 1793) accepted as Pseudunio auricularius (Spengler, 1793)
- Species Margaritana columbensis I. Lea, 1867 accepted as Strophitus subvexus (Conrad, 1834)
- Species Margaritana connasaugaensis I. Lea, 1858 accepted as Strophitus connasaugaensis (I. Lea, 1858)
- Species Margaritana curreyiana I. Lea, 1840 accepted as Pegias fabula (I. Lea, 1838)
- Species Margaritana decumbens (I. Lea, 1861) accepted as Elliptio complanata ([Lightfoot], 1786)
- Species Margaritana deltoidea I. Lea, 1838 accepted as Alasmidonta viridis (Rafinesque, 1820)
- Species Margaritana dernaica Pallary, 1928 accepted as Pseudunio auricularius (Spengler, 1793)
- Species Margaritana distorta (W. Bean, 1836) † accepted as Margaritifera distorta (W. Bean, 1836) †
- Species Margaritana durrovensis (R. A. Phillips, 1928) accepted as Margaritifera margaritifera (Linnaeus, 1758)
- Species Margaritana elliottii I. Lea, 1858 accepted as Anodontoides radiatus (Conrad, 1834)
- Species Margaritana elliptica I. Lea, 1859 accepted as Anodontoides radiatus (Conrad, 1834)
- Species Margaritana elongata Martinson, 1951 † accepted as Margaritifera baicalica Popova, 1964 †
- Species Margaritana etowaensis Conrad, 1849 accepted as Lasmigona etowaensis (Conrad, 1849)
- Species Margaritana etowahensis I. Lea, 1858 accepted as Margaritana georgiana I. Lea, 1859
- Species Margaritana fabula I. Lea, 1838 accepted as Pegias fabula (I. Lea, 1838)
- Species Margaritana fluviatilis Schumacher, 1817 accepted as Margaritifera (Margaritifera) margaritifera (Linnaeus, 1758)
- Species Margaritana freytagi Kobelt, 1886 accepted as Margaritifera (Margaritifera) margaritifera (Linnaeus, 1758)
- Species Margaritana georgiana I. Lea, 1859 accepted as Lasmigona etowaensis (Conrad, 1849)
- Species Margaritana gesnerii I. Lea, 1858 accepted as Strophitus subvexus (Conrad, 1834)
- Species Margaritana glabra C. M. Kolesnikov, 1956 † accepted as Margaritifera glabra (C. M. Kolesnikov, 1956) †
- Species Margaritana hembeli (Conrad, 1838) accepted as Margaritifera hembeli (Conrad, 1838)
- Species Margaritana holstonia I. Lea, 1838 accepted as Lasmigona holstonia (I. Lea, 1838)
- Species Margaritana jourdani Roule, 1886 † accepted as Unio galloprovincialis Matheron, 1843 †
- Species Margaritana margaritifera (Linnaeus, 1758) accepted as Margaritifera margaritifera (Linnaeus, 1758)
- Species Margaritana marginata (Say, 1818) accepted as Alasmidonta marginata Say, 1818
- Species Margaritana marocana Pallary, 1918 accepted as Pseudunio marocanus (Pallary, 1918)
- Species Margaritana matheroni Oppenheim, 1895 †
- Species Margaritana michaudi Locard, 1889 accepted as Margaritifera (Margaritifera) margaritifera (Linnaeus, 1758)
- Species Margaritana minor I. Lea, 1845 accepted as Alasmidonta viridis (Rafinesque, 1820)
- Species Margaritana mongolica (Middendorff, 1850) accepted as Middendorffinaia mongolica (Middendorff, 1850)
- Species Margaritana monodonta (Say, 1829) accepted as Margaritifera monodonta (Say, 1829)
- Species Margaritana perdahurica Yokoyama, 1932 † accepted as Margaritifera perdahurica (Yokoyama, 1932) †
- Species Margaritana pfeifferiana Bernardi, 1860 accepted as Aspatharia pfeifferiana (Bernardi, 1860)
- Species Margaritana pyrenaica Locard, 1889 accepted as Margaritifera (Margaritifera) margaritifera (Linnaeus, 1758)
- Species Margaritana quadrata I. Lea, 1861 accepted as Lasmigona subviridis (Conrad, 1835)
- Species Margaritana raveneliana I. Lea, 1834 accepted as Alasmidonta raveneliana (I. Lea, 1834)
- Species Margaritana redomica Pallary, 1923 accepted as Pseudunio auricularius (Spengler, 1793)
- Species Margaritana sachalinensis Zhadin, 1938 accepted as Margaritifera laevis (F. Haas, 1910)
- Species Margaritana sinuata (Lamarck, 1819) accepted as Pseudunio auricularius (Spengler, 1793)
- Species Margaritana spillmanii I. Lea, 1858 accepted as Strophitus subvexus (Conrad, 1834)
- Species Margaritana subangulata J. G. Cooper, 1894 † accepted as Gonidea coalingensis Arnold, 1909 †
- Species Margaritana tombecbeensis I. Lea, 1858 accepted as Pseudodontoideus subvexus (Conrad, 1834)
- Species Margaritana tombigbeensis "I. Lea, 1862" accepted as Margaritana tombecbeensis I. Lea, 1858
- Species Margaritana triangulata I. Lea, 1858 accepted as Alasmidonta triangulata (I. Lea, 1858)
- Species Margaritana vignouana Bernardi, 1859 accepted as Aspatharia rugifera (Dunker, 1858)
- Species Margaritana vondembuschiana I. Lea, 1840 accepted as Monodontina vondembuschiana (I. Lea, 1840)
- Species Margaritana wetzleri Dunker, 1848 † accepted as Pseudunio flabellatus (Goldfuss, 1837) †
- Species Margaritana woodthorpi Godwin-Austen, 1919 accepted as Gibbosula laosensis (I. Lea, 1863)
- Genus Margaritifera Schumacher, 1815 (46)
- 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 (2 172)
- 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