nominal species Unio hildrethianus Lea, 1834
 Lea, 1834, Trans. Amer. Phil. Soc. 5 [O. 1]: 36 [148], pl. 3, fig. 8.
Type(s): FIGURED SYNTYPE USNM_122252, Ohio R., Louisville, Ky.
= Simpsonaias ambigua Taxonomic Opinions
+ Simpsonaias ambigua (Say, 1825) — (Watters et al., 2009)
+ Simpsonaias ambigua (Say, 1825) — (Parmalee & Bogan, 1998)
+ Simpsonaias ambigua (Say) — (Strayer & Jirka, 1997)
+ Simpsonaias ambigua (Say, 1825) — (Clarke, 1985)
+ Simpsonaias ambigua (Say, 1825) — (Haas, 1969)
+ Simpsoniconcha ambigua (Say, 1825) — (F.C. Baker, 1928)
+ Simpsoniconcha ambigua (Say, 1825) — (Frierson, 1927)
+ Hemilastena ambigua (Say, 1825) — (Simpson, 1914)
+ Hemilastena ambigua (Say, 1825) — (Simpson, 1900)
= Unio (Margaritana) hildrethiana Lea, 1834 — (Call, 1900)
= Margaron (Margaritana) hildrethiana (Lea) — (Lea, 1870)
= Unio hildrethianus Lea, 1834 — (Sowerby, 1866)
= Unio hildrethianus Lea — (Küster, 1861)
= Baphia hildrethiana Lea — (Adams & Adams, 1857)
= Strophitus hildrethianus (Lea) — (Conrad, 1853)
+ Hemilastena [sic] ambigua Agass. — (Agassiz, 1852)
= Margaron (Margaritana) hildrethiana (Lea) — (Lea, 1852)
= Unio hildrethianus Lea — (Hanley, 1843)
= Margarita (Unio) hildrethianus (Lea, 1834) — (Lea, 1836)
+ Alasmodonta dubia Say — (Ferussac, 1835)
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