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Acuticosta Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 850.
Simpson, 1914. Descr. Cat. Naiades: 1139.
(intro'd as sub-gen. of Parreysia Conrad, 1853)
Type species: Unio chinensis Lea, 1868 (orig. desig.) = Acuticosta chinensis

Arcidens Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 661.
Simpson, 1914. Descr. Cat. Naiades: 475.
Type species: Alasmodonta confragosa Say, 1829 (orig. desig.) = Arcidens confragosus

Arcidopsis Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 861.
Simpson, 1914. Descr. Cat. Naiades: 1191.
Type species: Unio footei Theobald, 1876 (orig. desig.) = Arcidopsis footei

Artonaias Simpson, 1914
‘von Martens’ of Authors.
Simpson, 1914. Descr. Cat. Naiades: 311.
H.B. Baker, 1922. Occ. Pap. Mus. Zool. Univ. Mich. (106): ??.
(error for Arotonaias Martens, 1900)

Bineurus Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 839.
Simpson, 1914. Descr. Cat. Naiades: 1097.
(intro'd as sub-gen. of Pseudodon Gould, 1844)
Type species: Monocondyloea mouhotii Lea, 1863 (orig. desig.) = Bineurus mouhotii

Bullella Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 672.
Simpson, 1914. Descr. Cat. Naiades: 508.
(intro'd as sub-gen. of Alasmidonta Say, 1818)
Type species: Margaritana arcula Lea, 1838 (orig. desig.) = Alasmidonta arcula

Bulloideus Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 887.
Simpson, 1914. Descr. Cat. Naiades: 1286.
(intro'd as sub-gen. of Diplodon Wagner, 1827)
Type species: Unio bulloides Lea, 1859 (original designation) = Diplodon variabilis

Caelatura Conrad, 1853
‘Conrad’ of Authors.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 267 [as ‘Cælatura’].
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 820 [as ‘Cælatura’].
Pallary, 1909. Mém. Inst. Égypte 6(1): 76.
Simpson, 1914. Descr. Cat. Naiades: 1019.
Germain, 1918. Bull. Mus. Hist. Nat. 24: 41.
Germain, 1919. Bull. Mus. Hist. Nat. 25: 122.
Germain, 1921. Faun. malac. Terr. e Fluv. Iles Mascareignes: 403.
Pallary, 1924. Mém. Inst. Égypte 7 (n.s.): 42.
Pilsbry & Bequaert, 1927. Bull. AMNH 53: 399.
Haas, 1927. Senckenbergiana 9: 21.
Haas, 1929. Senckenbergiana 11: 111.
Bloomer, 1932. Proc. Malac. Soc. London 20: 168.
Thiele, 1934. Handb. Syst. Weichtierk. 3: 1248.
Haas, 1936. Abh. Senckenb. Naturf. Ges. 431: 54.
Dartevelle & Schwetz, 1937. Ann. Soc. Roy. Zool. Belgique 68: 60.
Haas, 1940. Zool. Ser. Field Mus. Nat. Hist. 24: 140.
Modell, 1942. Arch. Moll. 74(5/6): 190.
Bloomer, 1946. Proc. Malac. Soc. London 27: 68.
Bloomer, 1949. Proc. Malac. Soc. London 27: 241.
Franc, 1949. J. de Conch. 9: 158.
Leloup, 1950. Res. Sci. Explor. Hydrob. Lac Tanganyika (1946-1947) 3: 40.
Mongin, 1963. Mém. Soc. Géol. France 96: 10.
Modell, 1964. Arch. Moll. 93: 116.
Mandahl-Barth, 1968. Expl. Hydrobiol. Bangweulu-Luapula 12: 51.
Starobogatov, 1970. Fauna Moll. Continent.: 64.
Fischer-Piette & Métivier, 1974. Bull. Mus. Hist. Nat. 133: 10.
Appleton, 1979. Ann. S. Afr. Mus. 77(9): 154.
Kenmuir, 1980. Trans. Zimbabwe Sci. Assoc. 60(2): 7.
Curtis & Appleton, 1987. Jour. SWA Sci. Soc. 40-41: 50.
Ibrahim et al., 1999. EEAA Nat. Biodiv. Unit (10): 74.
Millard, 2001. Class. Moll. (3): 1061.
(incorrect original spelling of Coelatura Conrad, 1853)

Cafferia Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 824.
Simpson, 1914. Descr. Cat. Naiades: 574.
(intro'd as sub-gen. of Nodularia Conrad, 1853)
Type species: Unio caffer Krauss, 1848 (orig. desig.) = Unio caffer

Callonaia Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 867.
Simpson, 1914. Descr. Cat. Naiades: 1210.
Type species: Castalia duprei Récluz, 1842 (orig. desig.) = Callonaia duprei

Castaliella Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 866.
Simpson, 1914. Descr. Cat. Naiades: 1208.
Type species: Castalia sulcata Krauss, 1849 (orig. desig.) = Castaliella sulcata

Caudiculatus Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 581.
Simpson, 1914. Descr. Cat. Naiades: 218.
(intro'd as sub-gen. of Hyriopsis Conrad, 1853)
Type species: Unio caudiculatus Martens, 1867 (orig. desig.) = Caudiculatus caudiculatus

Chamberlainia Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 582.
Simpson, 1914. Descr. Cat. Naiades: 219.
Type species: Unio hainesianus Lea, 1856 (orig. desig.) = Chamberlainia hainesiana

Christadens Simpson, 1914
Simpson, 1914. Descr. Cat. Naiades: 1154.
‘Simpson’ Thiele, 1934. Handb. Syst. Weichtierk. 3: 821 [1252].
(incorrect original spelling of Cristadens Simpson, 1914)

Clione Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 583.
Simpson, 1914. Descr. Cat. Naiades: 223.
(error for Cleone Gistl, 1848)

Crassitesta Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 586.
Simpson, 1914. Descr. Cat. Naiades: 236.
(intro'd as sub-gen. of Cristaria Schumacher, 1817)
Type species: Cristaria (Crassitesta) radiata Simpson, 1900 (original designation) = Cristaria radiata

Cristadens Simpson, 1914
Simpson, 1914. Descr. Cat. Naiades: 1154.
(new name for Ctenodesma Simpson, 1900; correct name for Christadens Simpson, 1914)

Cuneopsis Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 804.
Simpson, 1914. Descr. Cat. Naiades: 943.
Type species: Unio celtiformis Heude, 1874 (orig. desig.) = Cuneopsis celtiformis

Cyclomya Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 885.
Simpson, 1914. Descr. Cat. Naiades: 1278.
(intro'd as sub-gen. of Diplodon Wagner, 1827)
Type species: Unio funebralis Lea, 1860 (orig. desig.) = Diplodon funebralis

Cylindrica Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 807.
Simpson, 1914. Descr. Cat. Naiades: 958.
(homonym of Clessin, 1882 [Gastro.]; intro'd as sub-gen. of Nodularia Conrad, 1853; renamed Pericylindrica Tomlin, 1930)
Type species: Nodularia cylindrica Simpson, 1900 (orig. desig.) = Lanceolaria cylindrica

Discomya Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 802.
Simpson, 1914. Descr. Cat. Naiades: 937.
(intro'd as sub-gen. of Quadrula Rafinesque, 1820)
Type species: Unio radulosus Drouët & Chaper, 1892 (orig. desig.) = Discomya radulosa

Dromus Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 614.
Simpson, 1914. Descr. Cat. Naiades: 341.
(homonym of Selby, 1840 [Aves]; renamed Dromas Lindahl, 1906; renamed Conchodromus Haas, 1930)
Type species: Unio dromas Lea, 1834 (orig. desig.) = Dromus dromas

Fusconaia Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 784.
Simpson, 1914. Descr. Cat. Naiades: 865.
(intro'd as sub-gen. of Quadrula Rafinesque, 1820)
Type species: Unio trigonus Lea, 1831 (orig. desig.) = Fusconaia flava

Gibbosula Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 804.
Simpson, 1914. Descr. Cat. Naiades: 941.
Type species: Mya crassa Wood, 1815 (original designation) = Gibbosula crassa

Hemilastena Simpson, 1900
‘Agassiz’ Simpson, 1900. Proc. U.S. Nat. Mus. 22: 673.
‘Agassiz’ Simpson, 1914. Descr. Cat. Naiades: 323.
(reference to Hemilastena Agassiz, 1852)
Type species: Alasmodonta ambigua Say, 1825 (orig. desig.) = Simpsonaias ambigua

Hyriana Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 872.
Simpson, 1914. Descr. Cat. Naiades: 1223.
(intro'd as sub-gen. of Prisodon Schumacher, 1817)
Type species: Unio ortonii Lea, 1868 (original designation) = Prisodon obliquus

Jugosus Simpson, 1914
Simpson, 1914. Descr. Cat. Naiades: 357.
(intro'd as sub-gen. of Strophitus Rafinesque, 1820)
Type species: Strophitus wrightianus Walker, 1901 (original designation) = Alasmidonta wrightiana

Laevirostris Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 894 [as ‘Lævirostris’].
Simpson, 1914. Descr. Cat. Naiades: 1308.
(intro'd as sub-gen. of Diplodon Wagner, 1827)
Type species: Unio stagnorum Dautzenberg, 1890 (orig. desig.) = Coelatura stagnorum

Lamellidens Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 854.
Simpson, 1914. Descr. Cat. Naiades: 1165.
Type species: Unio marginalis Lamarck, 1819 (orig. desig.) = Lamellidens marginalis

Lamprotula Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 796.
Simpson, 1914. Descr. Cat. Naiades: 913.
(intro'd as sub-gen. of Quadrula Rafinesque, 1820)
Type species: Chama plumbea Dillwyn, 1817 (orig. desig.) = Lamprotula plumbea

Lens Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 831.
Simpson, 1914. Descr. Cat. Naiades: 1067.
(intro'd as sub-gen. of Physunio Simpson, 1900)
Type species: Unio eximius Lea, 1856 (orig. desig.) = Lens eximius

Lepidodesma Simpson, 1896
Simpson, 1896. Proc. U.S. Nat. Mus. 18: 311.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 586.
Simpson, 1914. Descr. Cat. Naiades: 237.
Type species: Unio languilati Heude, 1874 (sub. desig. by Simpson, 1900: 586) = Lepidodesma languilati

Medionidus Simpson, 1900
Simpson, 1900. Proc. Acad. Nat. Sci. 52: 77.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 588.
Simpson, 1914. Descr. Cat. Naiades: 245.
Type species: Unio conradicus Lea, 1834 (orig. desig.) = Medionidus conradicus

Micronaias Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 743.
Simpson, 1914. Descr. Cat. Naiades: 714.
(intro'd as sub-gen. of Unio Retzius, 1788)
Type species: Unio aratus Lea, 1843 (orig. desig.) = Micronaias arata

Nasus Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 839.
Simpson, 1914. Descr. Cat. Naiades: 1099.
(homonym of Basilewski, 1855 [Pisces]; intro'd as sub-gen. of Pseudodon Gould, 1844; renamed Simpsonasus Bolotov et al., 2023)
Type species: Monocondylea nankingensis Heude, 1874 (orig. desig.) = Simpsonasus nankingensis

Obovalis Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 840.
Simpson, 1914. Descr. Cat. Naiades: 1101.
(intro'd as sub-gen. of Pseudodon Gould, 1844)
Type species: Pseudodon loomisi Simpson, 1900 (orig. desig.) = Obovalis omiensis

Pegias Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 660.
Simpson, 1914. Descr. Cat. Naiades: 472.
Type species: Margaritana fabula Lea, 1838 (orig. desig.) = Pegias fabula

Physunio Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 830.
Simpson, 1914. Descr. Cat. Naiades: 1062.
Type species: Unio gravidus Lea, 1856 (orig. desig.) = Physunio superbus

Pilea Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 522.
Simpson, 1914. Descr. Cat. Naiades: 22.
(intro'd as sub-gen. of Truncilla Rafinesque, 1819)
Type species: Unio personatus Say, 1829 (original designation) = Epioblasma personata

Pilsbryoconcha Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 587.
Simpson, 1914. Descr. Cat. Naiades: 239.
Type species: Anodonta exilis Lea, 1838 (orig. desig.) = Pilsbryoconcha exilis

Plethobasus Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 764.
Simpson, 1914. Descr. Cat. Naiades: 805.
(intro'd as sub-gen. of Pleurobema Rafinesque, 1819)
Type species: Unio aesopus Green, 1827 (original designation) = Plethobasus cyphyus

Pletholophus Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 585.
Simpson, 1914. Descr. Cat. Naiades: 229.
(intro'd as sub-gen. of Cristaria Schumacher, 1817)
Type species: Symphynota discoidea Lea, 1834 (original designation) = Pletholophus tenuis

Pressodonta Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 667.
Simpson, 1914. Descr. Cat. Naiades: 495.
(intro'd as sub-gen. of Alasmidonta Say, 1818; new name for Hemiodon Swainson, 1840)
Type species: Unio calceolus Lea, 1828 (orig. desig.) = Pressodonta viridis

Pseudavicula Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 860.
Simpson, 1914. Descr. Cat. Naiades: 1190.
(homonym of Hudleston, 1890; renamed Prisodontopsis Tomlin, 1928)
Type species: Unio (Metaptera) johnstoni E.A. Smith, 1893 (orig. desig.) = Prisodontopsis aviculaeformis

Pseudobaphia Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 849.
Simpson, 1914. Descr. Cat. Naiades: 1138.
(intro'd as sub-gen. of Parreysia Conrad, 1853)
Type species: Unio biesianus Heude, 1877 (orig. desig.) = Pseudobaphia biesiana

Pseudomutela Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 905.
Simpson, 1914. Descr. Cat. Naiades: 1362.
(intro'd as sub-gen. of Mutela Scopoli, 1777)
Type species: Mycetopus plicatus Sowerby, 1868 (orig. desig.) = Mutela dubia

Pseudoon Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 601 [as ‘Pseudoön’].
Simpson, 1914. Descr. Cat. Naiades: 298.
(intro'd as sub-gen. of Obovaria Rafinesque, 1819)
Type species: Unio ellipsis Lea, 1828 (original designation) = Obovaria olivaria

Pseudospatha Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 577.
Simpson, 1914. Descr. Cat. Naiades: 202.
(new name for Burtonia Bourguignat, 1883)
Type species: Spatha tanganyicensis E.A. Smith, 1880 (orig. desig.) = Pseudospatha tanganyicensis

Pterosygna Simpson, 1900
‘Rafinesque’ of Authors.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 665.
Ortmann, 1909. Ann. Carnegie Mus. 5: 196.
Simpson, 1914. Descr. Cat. Naiades: 490.
Ortmann, 1914. Nautilus 28(4): 43.
Walker, 1918. Occ. Pap. Mus. Zool. Univ. Mich. (49): 2.
F.C. Baker, 1928. Bull. Wisconsin Geol. Nat. Hist. Survey 70(2): 147.
Haas, 1930. Senckenbergiana 12(6): 326.
(error for Pterosyna Rafinesque, 1831)

Ptychobranchus Simpson, 1900
Simpson, 1900. Proc. Acad. Nat. Sci. 52: 79.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 612.
Simpson, 1914. Descr. Cat. Naiades: 332.
Type species: Unio phaseolus Hildreth, 1828 (orig. desig.) = Ptychobranchus fasciolaris

Ptychoderma Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 606.
Simpson, 1914. Descr. Cat. Naiades: 306.
(intro'd as sub-gen. of Plagiola Rafinesque, 1819)
Type species: Unio cyrenoides Philippi, 1847 (orig. desig.) = Arotonaias cyrenoides

Ptychorhynchus Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 850.
Simpson, 1914. Descr. Cat. Naiades: 1144.
Type species: Unio pfisteri Heude, 1874 (orig. desig.) = Ptychorhynchus pfisteri

Radiatula Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 820.
Simpson, 1914. Descr. Cat. Naiades: 1016.
(intro'd as sub-gen. of Nodularia Conrad, 1853)
Type species: Unio crispisulcatus Benson, 1862 (orig. desig.) = Radiatula crispisulcata

Rectidens Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 853.
Simpson, 1914. Descr. Cat. Naiades: 1157.
Type species: Unio prolongatus Drouët, 1894 (orig. desig.) = Rectidens sumatrensis

Rotundaria Agassiz, 1852
‘Rafinesque’ of Authors.
Agassiz, 1852. Arch. Naturg. 18(1): 48.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 765.
Ortmann, 1909. Ann. Carnegie Mus. 5: 201.
Ortmann, 1910. Nautilus 23(11): 140.
Ortmann, 1912. Ann. Carnegie Mus. 8: 257.
Simpson, 1914. Descr. Cat. Naiades: 811.
Utterback, 1915. Amer. Midl. Nat. 4(4): 149.
Ortmann, 1918. Proc. Amer. Phil. Soc. 57(6): 543.
Haas, 1929. Senckenbergiana 11: 333.
Haas, 1930. Senckenbergiana 12(6): 319.
(reference to Rotundaria Rafinesque, 1820)
Type species: Obliquaria (Rotundaria) tuberculata Rafinesque, 1820 = Cyclonaias tuberculata

Rugifera Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 670.
Simpson, 1914. Descr. Cat. Naiades: 504.
(intro'd as sub-gen. of Alasmidonta Say, 1818)
Type species: Alasmidonta marginata Say, 1818 (orig. desig.) = Alasmidonta marginata

Schistodesmus Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 803 [as ‘Shistodesmus’].
Simpson, 1914. Descr. Cat. Naiades: 939.
(correct name for Shistodesmus Simpson, 1900)
Type species: Unio (Dysnomia) lampreyanus Baird & Adams, 1867 (orig. desig.) = Schistodesmus lampreyanus

Spathopsis Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 857.
Simpson, 1914. Descr. Cat. Naiades: 1179.
(intro'd as sub-gen. of Lamellidens Simpson, 1900)
Type species: Anodonta guillaini Récluz, 1850 (orig. desig.) = Chambardia wahlbergi

Suborbiculus Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 835.
Simpson, 1914. Descr. Cat. Naiades: 1081.
(intro'd as sub-gen. of Pseudodon Gould, 1844)
Type species: Monocondylus orbicularis Morelet, 1866 (orig. desig.) = Pseudodon cambodjensis

Symphynota Simpson, 1900
‘Lea’ of Authors.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 662.
Ortmann, 1912. Ann. Carnegie Mus. 8: 280.
Simpson, 1914. Descr. Cat. Naiades: 480.
Ortmann, 1914. Nautilus 28(4): 41.
(reference to Symphynota Lea, 1829)
Type species: Symphynota compressa Lea, 1829 (orig. desig.) = Platynaias compressa

Trapezoideus Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 858.
Simpson, 1914. Descr. Cat. Naiades: 1180.
Type species: Unio foliaceus Gould, 1843 (orig. desig.) = Trapezoideus foliaceus

Triquetrana Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 869.
Simpson, 1914. Descr. Cat. Naiades: 1215.
(intro'd as sub-gen. of Hyria Lamarck, 1819)
Type species: Unio stevensii Lea, 1871 (original designation) = Triplodon corrugatus

Virgula Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 931.
Simpson, 1914. Descr. Cat. Naiades: 1454.
(intro'd as sub-gen. of Glabaris Gray, 1847)
Type species: Anodon ensiformis Wagner, 1827 (original designation) = Lamproscapha ensiformis

Virgus Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 851.
Simpson, 1914. Descr. Cat. Naiades: 1150.
Type species: Unio (Diplodon) beccarianus Tapparone Canefri, 1883 (orig. desig.) = Virgus beccarianus