nominal species Unio denigratus Lea, 1857
Lea, 1857, Proc. Acad. Nat. Sci. 9: 171.
Lea, 1859, Jour. Acad. Nat. Sci. 4 [O. 7]: 200 [18], pl. 23, fig. 83.
Type(s): HOLOTYPE USNM_85568, near Columbus, Ga.
= Elliptio nigella Taxonomic Opinions
+ Elliptio nigella (Lea, 1852) — (Williams et al., 2011)
+ Elliptio nigella (Lea, 1852) — (Williams et al., 2008)
+ Elliptio (s.s.) nigella (Lea, 1853) — (Burch, 1975)
+ Elliptio (s.s.) nigellus (Lea, 1853) — (Haas, 1969)
+ Elliptio (s.s.) nigellus (Lea, 1853) — (Frierson, 1927)
+ Unio (sec. Elliptio) nigellus Lea, 1853 — (Simpson, 1914)
+ Unio (sec. Elliptio) nigellus Lea, 1853 — (Simpson, 1900)
= Margaron (Unio) denigratus (Lea) — (Lea, 1870)
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