Amblema Rafinesque, 1820
Rafinesque, 1819, Jour. Phys. Chim. Hist. Nat. 88: 427.
Rafinesque, 1820, Ann. Gén. Sci. Phys. 5 (13): 314.
Rafinesque, 1864, [in] Binney & Tryon, reprint: 29, 57.
(intro'd as sub-gen. of Unio Retzius, 1788)
Type species: Amblema costata Rafinesque, 1820 (sub. desig. by Rafinesque, 1831: ??) = Amblema plicata

Emblema Deshayes, 1840
Deshayes, 1840, Diction. Class. Hist. Nat. 1: 334.
(error for Amblema Rafinesque, 1820)

Cokeria Marshall, 1916
Marshall, 1916, Nautilus 29: 133.
Type species: Cokeria southalli Marshall, 1916 (original designation) = Amblema plicata

Megalonoidea MacNeil, 1935
MacNeil, 1935, Jour. Paleont. 9: 13.
Type species: Megalonoidea porcata MacNeil, 1935 (orig. desig.) = Amblema porcata

Taxonomic History (since 1900)

Quadrula (sec. Crenodonta) — Simpson (1900), Simpson (1914)
— Simpson (1900), Simpson (1914), de Gregorio (1914), Millard (2001)
Unio (s.s.) — Call (1900)
Quadrula — Ortmann (1909), Ortmann (1909), Ortmann (1909), Ortmann (1910), Vanatta (1915)
Crenodonta — Ortmann (1912), Ortmann (1914), Clench & Turner (1956), Murray & Leonard (1962)
Unio — de Gregorio (1914), Henderson (1935)
Amblema — Utterback (1915), Ortmann (1918), Ortmann & Walker (1922), Ortmann (1923), ..., Dai et al. (2024), Zieritz et al. (2024), Matos et al. (2024), Matos et al. (2024)
Megalonaias — Ortmann & Walker (1922), F.C. Baker (1928), Burch (1975), Howells et al. (1996), Williams et al. (2008), Watters et al. (2009)
Quadrula (Fusconia [sic]) — Frierson (1927)
Amblema (s.s.) — Frierson (1927), Haas (1930), Haas (1969)
Amblema (Megalonaias) — Frierson (1927)
Margaritifera — Henderson (1935)
Megalonoidea — MacNeil (1935), Haas (1969)
Cokeria — Haas (1969)
Strophitus — Vidrine (1993)