Between brackets is the number of accepted species
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- Biota
- Kingdom Animalia
- Phylum Acanthocephala
- Phylum Agmata †
- Phylum Animalia (awaiting allocation)
- Phylum Animalia incertae sedis
- Phylum Annelida
- Phylum Arthropoda
- Phylum Brachiopoda
- Phylum Bryozoa
- Phylum Cephalorhyncha incertae sedis
- Phylum Chaetognatha
- Phylum Chitinozoa †
- Phylum Chordata
- Phylum Cnidaria
- Phylum Ctenophora
- Phylum Cycliophora
- Phylum Cycloneuralia incertae sedis
- Phylum Ecdysozoa incertae sedis †
- Phylum Echinodermata
- Phylum Entoprocta
- Phylum Gastrotricha
- Phylum Gnathostomulida
- Phylum Hemichordata
- Phylum Hyolitha †
- Phylum Kinorhyncha
- Phylum Lobopoda †
- Phylum Loricifera
- Phylum Micrognathozoa
- Phylum Mollusca
- Class Aplacophora
- Class Bivalvia
- Order Actinodontoida †
- Order Afghanodesmatida †
- Order Anomalodesmata
- Order Anomalodesmata (awaiting allocation)
- Order Antipleuroida †
- Order Arcida
- Order Arcoida accepted as Arcida
- Order Bivalvia (awaiting allocation)
- Order Bivalvia incertae sedis
- Order Cardiida
- Order Carditoida †
- Order Cyrtodontida †
- Order Euheterodonta incertae sedis
- Order Fordillida †
- Order Hippuritida †
- Order Hippuritoida † accepted as Hippuritida †
- Order Limoida
- Order Megalodontida †
- Order Modiomorphoida †
- Order Myalinida †
- Order Myoida
- Order Mytiloida
- Order Nuculanida
- Order Nuculanoida accepted as Nuculanida
- Order Nuculida
- Order Nuculoida accepted as Nuculida
- Order Orthonotida
- Order Ostreata incertae sedis
- Order Ostreida
- Order Ostreoida accepted as Ostreida
- Order Pectinida
- Order Pectinoida accepted as Pectinida
- Order Pelecypoda †
- Order Pholadomyoida
- Order Praecardioida †
- Order Protobranchia (awaiting allocation) †
- Order Pterioida
- Order Pteriomorphia (awaiting allocation)
- Order Solemyida
- Order Solemyoida accepted as Solemyida
- Order Trigoniida
- Order Trigonioida accepted as Trigoniida
- Order Tuarangiida †
- Order Unionoida
- Family Actinodontophoridae Newell, 1969 †
- Family Amblemidae
- Family Anthracosiidae Amalizky, 1892 †
- Family Archanodontidae Weir, 1969 †
- Family Deccanoidae Shah & Patel, 2024 †
- Family Etheriidae Deshayes, 1830
- Family Ferganoconchidae Martinson, 1956 †
- Family Hydriidae accepted as Hyriidae Swainson, 1840
- Family Hyriidae Swainson, 1840
- Family Iridinidae Swainson, 1840
- Family Liaoningiidae Yu & Dong, 1993 †
- Family Margaritiferidae Haas, 1940
- Family Microdontidae
- Family Monginaiidae Delvene & Munt in Delvene et al., 2022 †
- Family Mutelidae Swainson, 1840
- Family Mycetopodidae Gray, 1840
- Family Pachycardiidae Cox, 1961 †
- Family Palaeomutelidae Weir, 1967 †
- Family Plicatounionidae Kobayashi, 1968 †
- Family Prilukiellidae Starabogatov, 1970 †
- Family Pseudocardiniidae Martinson, 1961 †
- Family Rhaetidiidae Dominici & Danise, 2024 †
- Family Silesunionidae Skawina & Dzik, 2011 †
- Family Tamesnellidae Van Damme & Bogan in Van Damme et al., 2015 †
- Family Tegulaedontidae Van Damme & Bogan in Van Damme et al., 2015 †
- Family Trigonodidae Modell, 1942 †
- Family Unionida incertae sedis
- Family Unionidae Rafinesque, 1820
- Genus Actinonaias Crosse & P. Fischer, 1894
- Genus Actionaias Ortmann, 1925 accepted as Actinonaias Crosse & P. Fischer, 1894
- Genus Aculamprotula Wu, Liang, Wang & Shan, 1999
- Genus Acuticosta Simpson, 1900
- Genus Aeglia Swainson, 1840 accepted as Lampsilis Rafinesque, 1820
- Genus Afronaia Haas, 1962
- Genus Alasmadonta Jay, 1835 accepted as Alasmidonta Say, 1818
- Genus Alasmedonta Gray, 1847 accepted as Alasmidonta Say, 1818
- Genus Alasmesodonta Gray, 1847 accepted as Alasmidonta Say, 1818
- Genus Alasmidens Clarke, 1981 accepted as Alasmidonta Say, 1818
- Genus Alasmidonta Say, 1818
- Genus Alasminota Ortmann, 1914 accepted as Lasmigona Rafinesque, 1831
- Genus Alasmisodonta De Blainville, 1825 accepted as Alasmidonta Say, 1818
- Genus Alasmodon Thomson, 1820 accepted as Alasmidonta Say, 1818
- Genus Alasmodonta Say in Nicholson, 1819 accepted as Alasmidonta Say, 1818
- Genus Alismadon Fleming, 1828 accepted as Alasmidonta Say, 1818
- Genus Amblamodon Rafinesque, 1831 accepted as Amblasmodon Rafinesque, 1831
- Genus Amblasmodon Rafinesque, 1831 accepted as Lasmigona Rafinesque, 1831
- Genus Amblema Rafinesque, 1820
- Genus Amblema Rafinesque, 1819
- Genus Amphinaias Crosse & Fischer, 1894 accepted as Rotundaria Rafinesque, 1820
- Genus Amygdalonaias Crosse & Fischer, 1894 accepted as Truncilla Rafinesque, 1819
- Genus Amygdalonajas Crosse & Fischer, 1894 accepted as Truncilla Rafinesque, 1819
- Genus Anadonta Goldfuss, 1820 † accepted as Anodonta Lamarck, 1799
- Genus Anadontoides Simpson in F.C. Baker, 1898 accepted as Anodontoides Simpson in F.C. Baker, 1898
- Genus Anatiniana Bourguignat, 1881
- Genus Anelasmodon Agassiz, 1846 accepted as Alasmidonta Say, 1818
- Genus Anelasmodonta Herrmannsen, 1846 accepted as Alasmidonta Say, 1818
- Genus Anemina F. Haas, 1969
- Genus Anodon Oken, 1815 † accepted as Anodonta Lamarck, 1799
- Genus Anodonta Lamarck, 1799
- Genus Anodonta Link, 1807
- Genus Anodonte Fischer de Waldheim, 1823 † accepted as Anodonta Lamarck, 1799
- Genus Anodontes Cuvier, 1817 † accepted as Anodonta Lamarck, 1799
- Genus Anodontites Bruguière, 1792
- Genus Anodontoides Simpson in F.C. Baker, 1898
- Genus Anodontopsis Simpson in F.C. Baker, 1898 accepted as Anodontoides Simpson in F.C. Baker, 1898
- Genus Anodota Petrbok, 1930 † accepted as Anodonta Lamarck, 1799
- Genus Archaeounio Koarai & Matsukawa, 2016 †
- Genus Arcidens Simpson, 1900
- Genus Arcidopsis Simpson, 1900
- Genus Arconaia Conrad, 1865
- Genus Arconalia Grasset, 1884 accepted as Arconaia Conrad, 1865
- Genus Arcuneopsis Huang, Dai & Wu in Wu et al., 2022
- Genus Ariocaelatura Germain, 1921
- Genus Arkansia Ortmann & Walker, 1912 accepted as Arcidens Simpson, 1900
- Genus Arnoldina Hannibal, 1912 † accepted as Anodonta Lamarck, 1799
- Genus Arotonaias Martens, 1900
- Genus Artonaias Simpson, 1914
- Genus Atlanticoncha Smith, Pfeiffer & Johnson, 2020
- Genus Aurora Simpson, 1900 accepted as Diaurora Cockerell, 1903
- Genus Aximedia Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Genus Balwantia Prashad, 1919
- Genus Bariosta Rafinesque, 1831 accepted as Plectomerus Conrad, 1853
- Genus Barynaias Crosse & Fischer, 1894
- Genus Baryosta Agassiz, 1846 accepted as Bariosta Rafinesque, 1831
- Genus Beringiana Starobogatov in Zatravkin, 1983 accepted as Anodonta Lamarck, 1799
- Genus Brachyanodon Crosse & Fischer, 1894 accepted as Anodonta Lamarck, 1799
- Genus Bullata Frierson, 1927 accepted as Rotundaria Rafinesque, 1820
- Genus Bullella Simpson, 1900 accepted as Alasmidonta Say, 1818
- Genus Caelatura Fischer, 1883
- Genus Caenonaias Crosse & Fischer, 1894
- Genus Cafferia Simpson, 1900
- Genus Calceola Swainson, 1840 accepted as Alasmidonta Say, 1818
- Genus Cambarunio Watters, 2018
- Genus Canthyria Swainson, 1840 accepted as Elliptio Rafinesque, 1819
- Genus Capsaeformis Frierson, 1927 accepted as Epioblasma Rafinesque, 1831
- Genus Carunculina Simpson in Baker, 1898
- Genus Chamberlainia Simpson, 1900
- Genus Christadens Simpson, 1914 accepted as Ctenodesma Simpson, 1900
- Genus Coelatura Pfeiffer, 1877
- Genus Cokeria Marshall, 1916 accepted as Amblema Rafinesque, 1820
- Genus Colletopterum Bourguignat, 1880
- Genus Collopterum Bédé, 1932
- Genus Complanaria Swainson, 1840 accepted as Lasmigona Rafinesque, 1831
- Genus Conchodromus Haas, 1930 accepted as Dromus Simpson, 1900
- Genus Conradilla Ortmann, 1921 accepted as Lemiox Rafinesque, 1831
- Genus Contradens Haas, 1911 accepted as Lens Simpson, 1900
- Genus Corunculina Simpson in F.C. Baker, 1898 accepted as Toxolasma Rafinesque, 1831
- Genus Crassiana Locard, 1889
- Genus Crenodonta Schlüter, 1838 accepted as Ellipsaria Rafinesque, 1820
- Genus Cristadens Simpson, 1914 accepted as Christadens Simpson, 1914
- Genus Cristaria Schumacher, 1817
- Genus Crypogenia Fischer, 1886 accepted as Cyprogenia Agassiz, 1852
- Genus Ctenodesma Simpson, 1900
- Genus Cuneopsidea Wenz, 1928
- Genus Cuneopsis Simpson, 1900
- Genus Cyclonaias Pilsbry in Ortmann & Walker, 1922 accepted as Rotundaria Rafinesque, 1820
- Genus Cyprogenia Agassiz, 1852
- Genus Cyrtonaias Crosse & Fischer, 1894
- Genus Cyrtonais Frierson, 1927 accepted as Cyrtonaias Crosse & Fischer, 1894
- Genus Daliella Preston, 1912
- Genus Dalliella Simpson, 1900
- Genus Decarambis Paetel, 1875
- Genus Decurambis Rafinesque, 1831 accepted as Alasmidonta Say, 1818
- Genus Delphinonaias Crosse & Fischer, 1894
- Genus Delphinonais Frierson, 1927
- Genus Diaurora Cockerell, 1903
- Genus Diplodon Spix, 1827
- Genus Disconaias Crosse & Fischer, 1894
- Genus Disnomia Bielz, 1869 accepted as Dysnomia Agassiz, 1852
- Genus Dromas Lindahl, 1906 accepted as Dromus Simpson, 1900
- Genus Dromus Simpson, 1900
- Genus Dysnomia Agassiz, 1852 accepted as Epioblasma Rafinesque, 1831
- Genus Dysonomia Paetel, 1890 accepted as Dysnomia Agassiz, 1852
- Genus Elasmigena Agassiz, 1846 accepted as Elasmogona Agassiz, 1846
- Genus Elasmogena Agassiz, 1846 accepted as Elasmogona Agassiz, 1846
- Genus Elasmogona Agassiz, 1846 accepted as Lasmigona Rafinesque, 1831
- Genus Ellipsaria Rafinesque, 1820
- Genus Elliptio Rafinesque, 1819
- Genus Elliptis Agassiz, 1845 accepted as Elliptio Rafinesque, 1819
- Genus Elliptoidens Frierson, 1927 accepted as Elliptoideus Frierson, 1927
- Genus Elliptoideus Frierson, 1927
- Genus Elongaria Haas, 1912
- Genus Ensidens Frierson, 1911
- Genus Ensinaia Starobogatov, 1970 accepted as Elliptio Rafinesque, 1819
- Genus Eolymnium Prashad, 1919
- Genus Epilobasma Simpson, 1900 accepted as Epioblasma Rafinesque, 1831
- Genus Epioblasma Rafinesque, 1831
- Genus Euphrata Pallary, 1933 accepted as Anodonta Lamarck, 1799
- Genus Eurinea Conrad, 1853
- Genus Euryma Baker, 1898
- Genus Eurynaia Frierson, 1927
- Genus Eurynea Paetel, 1875
- Genus Eurynia Rafinesque, 1819
- Genus Flexiplis Rafinesque, 1831 accepted as Pyganodon Crosse & P. Fischer, 1894
- Genus Flexiptis Rafinesque, 1831 accepted as Pyganodon Crosse & P. Fischer, 1894
- Genus Friersonia Ortmann, 1912
- Genus Fuscnoaia Simpson, 1900 accepted as Fusconaia Simpson, 1900
- Genus Fusconaia Simpson, 1900
- Genus Fusconaja Simpson, 1900 accepted as Fusconaia Simpson, 1900
- Genus Fusconala Simpson, 1900 accepted as Fusconaia Simpson, 1900
- Genus Fusconaria accepted as Fusconaia Simpson, 1900
- Genus Fusconia Simpson, 1900 accepted as Fusconaia Simpson, 1900
- Genus Gibbosula Simpson, 1900
- Genus Glabaris Gray, 1847
- Genus Glebula Conrad, 1853
- Genus Gonamblus Rafinesque, 1831 accepted as Plectomerus Conrad, 1853
- Genus Gonidea Conrad, 1857
- Genus Grandidieria Bourguignat, 1885
- Genus Hamiota Roe & Hartfield, 2005
- Genus Hemilastena Agassiz, 1852
- Genus Hemiodon Swainson, 1840 accepted as Strophitus Rafinesque, 1820
- Genus Hemistena Rafinesque, 1820
- Genus Holandriana Locard, 1889
- Genus Hollandriana Germain, 1904
- Genus Hyriopsis Conrad, 1853
- Genus Iheringella Pilsbry, 1893
- Genus Indochinella Bolotov, Pfeiffer, Vikhrev & Konopleva, 2018
- Genus Indonaia Prashad, 1918
- Genus Inversidens F. Haas, 1911
- Genus Inversiunio
- Genus Isannaia Jeratthitikul, Sutcharit & Prasankok, 2024
- Genus Jugosus Simpson, 1914 accepted as Alasmidonta Say, 1818
- Genus Khairuloconcha Zieritz, Lopes-Lima & Pfeiffer in Zieritz et al., 2021
- Genus Koreosolenaia Lee, Kim, Lopes-Lima & Bogan, 2020
- Genus Lamelledens Simpson, 1900 accepted as Lamellidens Simpson, 1900
- Genus Lamellidens Simpson, 1900
- Genus Lamproscapha Swainson, 1840
- Genus Lamprotula Simpson, 1900
- Genus Lamprotura Uwadi, 1934 † accepted as Lamprotula Simpson, 1900
- Genus Lampsilis Rafinesque, 1820
- Genus Lamsilis Schalie, 1934 accepted as Lampsilis Rafinesque, 1820
- Genus Lanceolaria Conrad, 1853
- Genus Lannanaia Jeratthitikul, Sutcharit & Prasankok, 2024
- Genus Lapidosus Simpson, 1900 accepted as Disconaias Crosse & Fischer, 1894
- Genus Lasmigona Rafinesque, 1831
- Genus Lasmonos Rafinesque, 1831 accepted as Leptodea Rafinesque, 1820
- Genus Lastena Rafinesque, 1820 accepted as Potamilus Rafinesque, 1818
- Genus Lastenes Desmarest in Chenu, 1859
- Genus Leaunio Watters, 2018
- Genus Legumenaia Tryon, 1884 accepted as Leguminaia Conrad, 1865
- Genus Legumia Agassiz, 1852 accepted as Ligumia Swainson, 1840
- Genus Leguminaia Conrad, 1865
- Genus Lemiox Rafinesque, 1831
- Genus Lens Simpson, 1900
- Genus Lepidodesma Simpson, 1896
- Genus Leptodea Rafinesque, 1820
- Genus Levingtonia Ortmann, 1914 accepted as Lexingtonia Ortmann, 1914
- Genus Lexingtonia Ortmann, 1914 accepted as Fusconaia Simpson, 1900
- Genus Ligumea Swainson, 1840 accepted as Ligumia Swainson, 1840
- Genus Ligumia Swainson, 1840
- Genus Ligumina Philippi, 1853 accepted as Ligumia Swainson, 1840
- Genus Limaea Rosen, 1925 accepted as Unio Philipsson, 1788
- Genus Limella Rafinesque, 1815 accepted as Unio Philipsson, 1788
- Genus Limnadea Agassiz, 1846 accepted as Potamilus Rafinesque, 1818
- Genus Limnaea Poli, 1791 accepted as Unio Philipsson, 1788
- Genus Limnobasilissa Hannibal, 1912 † accepted as Gonidea Conrad, 1857
- Genus Lintoxia Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Genus Locardiana Locard, 1889
- Genus Lostena Gray, 1847
- Genus Luteacarnea Frierson, 1927 accepted as Obovaria Rafinesque, 1819
- Genus Lymnadea Sowerby, 1839 accepted as Lymnadia Sowerby, 1839
- Genus Lymnadia Sowerby, 1839 accepted as Lasmigona Rafinesque, 1831
- Genus Lyntoxia Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Genus Magalonaias Utterback, 1915 accepted as Megalonaias Utterback, 1915
- Genus Magnonaias Utterback, 1915
- Genus Margaron Lea, 1852
- Genus Medionidus Simpson, 1900
- Genus Megadomus Swainson, 1840 accepted as Lasmigona Rafinesque, 1831
- Genus Megalonaias Utterback, 1915
- Genus Mesanodon Crosse & Fischer, 1894 accepted as Anodonta Lamarck, 1799
- Genus Mesohyridella McMichael, 1957 †
- Genus Mesonaias Crosse & Fischer, 1894 accepted as Cyrtonaias Crosse & Fischer, 1894
- Genus Metaptera Rafinesque, 1820 accepted as Potamilus Rafinesque, 1818
- Genus Microcondylaea Vest, 1866
- Genus Microcondylus Drouet, 1879
- Genus Micromya Agassiz, 1852 accepted as Villosa Frierson, 1927
- Genus Micronaias Simpson, 1900
- Genus Middendorffinaia Moskvicheva & Starobogatov, 1973 †
- Genus Mimo Xiang, Lu, He & Li, 2025
- Genus Modellnaia Brandt, 1974 †
- Genus Monelagmus Agassiz, 1846 accepted as Leptodea Rafinesque, 1820
- Genus Monelasmus Agassiz, 1846 accepted as Leptodea Rafinesque, 1820
- Genus Monodonta Say, 1817 accepted as Alasmidonta Say, 1818
- Genus Mujanaia Delvene, Munt, Piñuela & García-Ramos, 2016 †
- Genus Naia Swainson, 1840 accepted as Parreysia Conrad, 1853
- Genus Naidea Swainson, 1840 accepted as Potamilus Rafinesque, 1818
- Genus Namkongnaia Jeratthitikul, Sutcharit, Ngor & Prasankok, 2021
- Genus Nannonaia Haas in Martini & Chemnitz, 1913 accepted as Elongaria Haas, 1912
- Genus Nayadina de Gregorio, 1914 accepted as Utterbackia F.C. Baker, 1927
- Genus Nephritica Frierson, 1927
- Genus Nephronaias Crosse & Fischer, 1894
- Genus Nephronajas Baker, 1916
- Genus Nepronaias Simpson, 1900
- Genus Nitia Pallary, 1924
- Genus Nodularia Conrad, 1853
- Genus Nodularidia Cockerell, 1901 accepted as Nodularia Conrad, 1853
- Genus Nyassunio Haas, 1936
- Genus Nyeinchanconcha Bolotov et al., 2020
- Genus Oblicaria Rafinesque, 1820 accepted as Obliquaria Rafinesque, 1820
- Genus Obliquaria Rafinesque, 1820
- Genus Obliquata Frierson, 1927 accepted as Epioblasma Rafinesque, 1831
- Genus Obovalis Simpson, 1900
- Genus Obovaria Rafinesque, 1819
- Genus Odatelia Rafinesque, 1832 accepted as Hemistena Rafinesque, 1820
- Genus Oguranodonta Kuroda & Habe, 1987
- Genus Onodon Partington, 1835-37 † accepted as Anodonta Lamarck, 1799
- Genus Orthonymus Agassiz, 1852 accepted as Theliderma Swainson, 1840
- Genus Ortmanniana Frierson, 1927
- Genus Oxynaia Haas, 1913
- Genus Pachynaias Fischer & Crosse, 1894
- Genus Paetulunio Watters, 2018
- Genus Pagias Simpson, 1900 accepted as Pegias Simpson, 1900
- Genus Paranodonta Kobayashi & Susuki, 1936 †
- Genus Paraptera Ortmann, 1911 accepted as Leptodea Rafinesque, 1820
- Genus Pareptera Ortmann, 1911 accepted as Leptodea Rafinesque, 1820
- Genus Parreysia Conrad, 1853
- Genus Parreyssia Annandale, 1919 accepted as Parreysia Conrad, 1853
- Genus Parvasolenaia Huang & Wu, 2019
- Genus Parvaspina Perkins, Johnson & Gangloff, 2017
- Genus Pegias Simpson, 1900
- Genus Pegius
- Genus Penchinatiana Locard, 1889
- Genus Penita Frierson, 1927 accepted as Epioblasma Rafinesque, 1831
- Genus Perpenaias Frierson, 1927 accepted as Popenaias Frierson, 1927
- Genus Physunio Simpson, 1900
- Genus Pilea Simpson, 1900 accepted as Epioblasma Rafinesque, 1831
- Genus Pilsbryocandra Coates, 1925 accepted as Pilsbryoconcha Simpson, 1900
- Genus Pilsbryoconcha Simpson, 1900
- Genus Plagiodon Lea, 1856
- Genus Plagiola Rafinesque, 1819 accepted as Ptychobranchus Simpson, 1900
- Genus Plagiolopsis Thiele, 1934 accepted as Ellipsaria Rafinesque, 1820
- Genus Platynaias Walker, 1918 accepted as Lasmigona Rafinesque, 1831
- Genus Plectomerus Conrad, 1853
- Genus Plesielliptio Russell, 1934 †
- Genus Plethobasus Simpson, 1900
- Genus Pleurobema Rafinesque, 1819
- Genus Pleuronaia Frierson, 1927
- Genus Pleuronia Frierson, 1927
- Genus Plicatounio Kobayashi & Susuki, 1936 †
- Genus Popenaias Frierson, 1927
- Genus Popenais Frierson, 1927 accepted as Popenaias Frierson, 1927
- Genus Potamida Agassiz, 1846 accepted as Potomida Swainson, 1840
- Genus Potamila Rafinesque, 1818 accepted as Potamilus Rafinesque, 1818
- Genus Potamila Rafinesque, 1820 accepted as Potamilus Rafinesque, 1818
- Genus Potamilus Rafinesque, 1818
- Genus Potomida Swainson, 1840
- Genus Pressidens Haas, 1910
- Genus Pressodonta Simpson, 1900 accepted as Alasmidonta Say, 1818
- Genus Prohyria McMichael, 1957 †
- Genus Prohyriopsis Haas, 1914
- Genus Prolasmidonta Ortmann, 1914 accepted as Alasmidonta Say, 1818
- Genus Pronodularia Starobogatov, 1970 †
- Genus Proptera Rafinesque, 1819 accepted as Potamilus Rafinesque, 1818
- Genus Protelliptio Russell, 1934 †
- Genus Protoanodonta Delvene & Araujo, 2009 †
- Genus Protohyridella Cotton & Gabriel, 1932
- Genus Protunio Haas, 1913
- Genus Pseuanodonta Kennard & Woodward, 1926 accepted as Pseudanodonta Bourguignat, 1876
- Genus Pseudanodonta Bourguignat, 1876
- Genus Pseudoanodonta Picaglia, 1893 accepted as Pseudanodonta Bourguignat, 1876
- Genus Pseudobaphia Simpson, 1900
- Genus Pseudocuneopsis Huang, Dai, Chen & Wu in Wu et al., 2022
- Genus Pseudodon Gould, 1844
- Genus Pseudodontoideus Frierson, 1927 accepted as Strophitus Rafinesque, 1820
- Genus Pseudodontopsis Kobelt in Rossmaessler, 1912
- Genus Pseudodus Morgan, 1885 accepted as Pseudodon Gould, 1844
- Genus Pseudoon Simpson, 1900 accepted as Obovaria Rafinesque, 1819
- Genus Pseudopostolata Dai, Chen, Huang & Wu, 2024
- Genus Psoronaias Crosse & Fischer, 1894
- Genus Pterosygna Rafinesque, 1831 accepted as Pterosyna Rafinesque, 1831
- Genus Pterosyna Rafinesque, 1831 accepted as Lasmigona Rafinesque, 1831
- Genus Ptychobranchus Simpson, 1900
- Genus Ptychorhynchus Simpson, 1900
- Genus Pustulosa Frierson, 1927 accepted as Rotundaria Rafinesque, 1820
- Genus Pyganodon Crosse & P. Fischer, 1894
- Genus Quadrula Rafinesque, 1820
- Genus Quaduila Rafinesque, 1820 accepted as Quadrula Rafinesque, 1820
- Genus Quincuncina Ortmann & Walker in Ortmann, 1922 accepted as Fusconaia Simpson, 1900
- Genus Radiatula Simpson, 1900
- Genus Rectidens Simpson, 1900
- Genus Reginaia Campbell & Lydeard, 2012
- Genus Renatus Rochebrune, 1904
- Genus Reneus Jousseaume, 1886
- Genus Rhabdotophorus Russell, 1935
- Genus Rhombuniopsis F. Haas, 1920
- Genus Rotundaria Rafinesque, 1820
- Genus Ruellania Bourguignat, 1885 accepted as Grandidieria Bourguignat, 1885
- Genus Ruellaria Fischer, 1886 accepted as Grandidieria Bourguignat, 1885
- Genus Rugifera Simpson, 1900 accepted as Alasmidonta Say, 1818
- Genus Sagittunio Watters, 2018
- Genus Sayunio de Gregorio, 1914 accepted as Hemistena Rafinesque, 1820
- Genus Scabiellus Bolotov et al., 2020
- Genus Scabies F. Haas, 1911
- Genus Scalenaria Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Genus Scalenilla Ortmann & Walker, 1922 accepted as Epioblasma Rafinesque, 1831
- Genus Scatenaria Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Genus Schistodesma Simpson, 1900
- Genus Schistodesmus Simpson, 1900
- Genus Schizocleithrum Haas, 1911 accepted as Lens Simpson, 1900
- Genus Seguminaia Paetel, 1890 accepted as Leguminaia Conrad, 1865
- Genus Shahpuranaia Delvene, Munt, Paul & Gangopadhyay, 2024 †
- Genus Shistodesma Simpson, 1900
- Genus Shistodesmus Simpson, 1900
- Genus Simonaias Crosse & Fischer, 1894
- Genus Simponella Haas, 1914
- Genus Simpsonaias Frierson, 1914
- Genus Simpsonella Cockerell, 1903
- Genus Simpsoniconcha Frierson, 1914 accepted as Simpsonaias Frierson, 1914
- Genus Simpsonunio Starobogatov, 1970 † accepted as Lampsilis Rafinesque, 1820
- Genus Sinanodonta Modell, 1945
- Genus Sinosolenaia Bolotov, Kondakov, Konopleva & Vikhrev, 2021
- Genus Sintoina Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Genus Sintoxia Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Genus Solenaia Conrad, 1869
- Genus Sphenonaias Crosse & Fischer, 1894
- Genus Sprickia Modell, 1942 accepted as Lens Simpson, 1900
- Genus Stenelasma Herrmannsen, 1849 accepted as Potamilus Rafinesque, 1818
- Genus Stophites Desmarest in Chenu, 1859 accepted as Strophitus Rafinesque, 1820
- Genus Striata Frierson, 1927 accepted as Obovaria Rafinesque, 1819
- Genus Strophilus Gray, 1847 accepted as Strophitus Rafinesque, 1820
- Genus Strophites Deshayes, 1832 accepted as Strophitus Rafinesque, 1820
- Genus Strophitus Rafinesque, 1820
- Genus Subtentus Frierson, 1927 accepted as Ptychobranchus Simpson, 1900
- Genus Suifununio Moskvicheva & Starobogatov, 1973
- Genus Sulcataria Rafinesque, 1831 accepted as Sulcularia Rafinesque, 1831
- Genus Sulcularia Rafinesque, 1831 accepted as Lasmigona Rafinesque, 1831
- Genus Sundadontina Bolotov et al., 2020
- Genus Symphinota Villa, 1841
- Genus Symphionata Philippi, 1853
- Genus Symphonota Berge, 1847
- Genus Symphynota Lea, 1829 accepted as Potamilus Rafinesque, 1818
- Genus Symphyonota Philippi, 1853
- Genus Syntonia Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
- Genus Syntoxia Agassiz, 1846 accepted as Pleurobema Rafinesque, 1819
- Genus Telederma Swainson, 1840 accepted as Theliderma Swainson, 1840
- Genus Tetoriunio Koarai & Matsukawa, 2016 †
- Genus Tetraplodon Spix, 1827
- Genus Thaiconcha Bolotov et al., 2020
- Genus Theliderma Swainson, 1840
- Genus Theloderma Herrmannsen, 1849 accepted as Theliderma Swainson, 1840
- Genus Thelyderma Agassiz, 1846 accepted as Theliderma Swainson, 1840
- Genus Torulosa Frierson, 1927 accepted as Epioblasma Rafinesque, 1831
- Genus Toxelasma Agassiz, 1849 accepted as Toxolasma Rafinesque, 1831
- Genus Toxolasma Rafinesque, 1831
- Species Toxolasma corvunculus (I. Lea, 1868)
- Species Toxolasma cylindrellus (I. Lea, 1868)
- Species Toxolasma lividus (Rafinesque, 1831)
- Species Toxolasma mearnsi (Simpson, 1900)
- Species Toxolasma parvus (Barnes, 1823)
- Species Toxolasma paulus (I. Lea, 1840)
- Species Toxolasma pullus (Conrad, 1838)
- Species Toxolasma texasensis (Lea, 1857)
- Species Toxolasma texasiensis (I. Lea, 1857)
- Genus Trapezoideus Simpson, 1900
- Genus Triaslacus Began & Weaver, 2012 †
- Genus Tritigonia Agassiz, 1852 accepted as Tritogonia Agassiz, 1852
- Genus Tritogonia Agassiz, 1852
- Genus Troncilla Rafinesque, 1819 accepted as Truncilla Rafinesque, 1819
- Genus Truncilla Rafinesque, 1819
- Genus Truncillopsis Ortmann & Walker, 1922 accepted as Epioblasma Rafinesque, 1831
- Genus Uniandra Haas, 1912 accepted as Lens Simpson, 1900
- Genus Unio Philipsson, 1788
- Genus Uniomeris Tryon, 1884 accepted as Uniomerus Conrad, 1853
- Genus Uniomerus Conrad, 1853
- Genus Uniopsis Swainson, 1840 † accepted as Alasmidonta Say, 1818
- Genus Uralinaia Starobogatov, 1970
- Genus Utterbachia F.C. Baker, 1927 accepted as Utterbackia F.C. Baker, 1927
- Genus Utterbackia F.C. Baker, 1927
- Genus Utterbackiana Frierson, 1927 accepted as Utterbackia F.C. Baker, 1927
- Genus Venusta Frierson, 1927 accepted as Venustaconcha Frierson, 1927
- Genus Venustaconcha Frierson, 1927
- Genus Villosa Frierson, 1927
- Genus Yaukthwa Konopleva, Pfeiffer, Vikhrev, Kondakov, Gofarov, Aksenova, Lunn, Chan & Bolotov, 2019
- Family Unionoida (awaiting allocation)
- Family Unionoidea (awaiting allocation)
- Family Unionoidea incertae sedis
- Order Venerida
- Genus Salterella Jones & Woodward, 1888 † accepted as Salterina Jones & Woodward, 1888 †
- Genus Salterina Jones & Woodward, 1888 †
- Genus Sinocaris Mansuy, 1912 †
- Genus Solenocaris Meek, 1871 † accepted as Strigocaris Vogdes, 1889 †
- Genus Strigocaris Vogdes, 1889 †
- Class Calyptoptomatida †
- Class Camerothecida
- Class Cephalopoda
- Class Cricoconarida †
- Class Gastropoda
- Class Helcionelloida †
- Class Mollusca (awaiting allocation)
- Class Mollusca incertae sedis
- Class Monoplacophora
- Class Paragastropoda †
- Class Polyplacophora
- Class Rostroconchia †
- Class Scaphopoda
- Class Stenothecoida †
- Class Tentaculita †
- Family Maikhanellidae Missarzhevsky, 1989 †
- Genus Lingulocaris Salter, 1866 †
- Genus Modiolocaris Peach in Jehu & Campbell, 1917 † accepted as Lingulocaris Salter, 1866 †
- Phylum Monoblastozoa accepted as Animalia incertae sedis
- Phylum Nematoda
- Phylum Nematomorpha
- Phylum Nemertea
- Phylum Onychophora
- Phylum Orthonectida
- Phylum Phoronida
- Phylum Placozoa
- Phylum Platyhelminthes
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera
- Phylum Priapula accepted as Priapulida
- Phylum Priapulida
- Phylum Problematica † accepted as Animalia incertae sedis
- Phylum Rhombozoa
- Phylum Rotifera
- Phylum Scalidophora incertae sedis
- Phylum Sipuncula
- Phylum Tardigrada
- Phylum Trace fossils †
- Phylum Vendobionta †
- Phylum Vestimentifera accepted as Siboglinidae Caullery, 1914
- Phylum Vetulicolia †
- Phylum Vinctiplicata incertae sedis †
- Phylum Xenacoelomorpha
- Genus Trilobocaris Pribyl, 1953 †
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Kingdom Fungi
- Kingdom Plantae
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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