Bivalvia | ... | Unionoidea | Unionidae | Ambleminae | Pleurobemini | Elliptio downiei

Lea, 1858. Proc. Acad. Nat. Sci. 10: 166.
Lea, 1859. Jour. Acad. Nat. Sci. 4 [O. 7]: 216 [34], pl. 27, fig. 96.
Type(s): HOLOTYPE USNM_84855, Satilla R., Camden Co., Ga.
+ Elliptio (s.s.) crassidens (Lamarck, 1819) — Burch, 1975: 172.
+ Elliptio (s.s.) crassidens downiei (Lea, 1858) — R.I. Johnson, 1970: 307.
+ Elliptio (s.s.) geminus (Lea, 1856) — Haas, 1969: 218.
+ Elliptio (s.s.) geminus (Lea, 1856) — Frierson, 1927: 26.
+ Unio (sec. Elliptio) geminus Lea, 1856 — Simpson, 1914: 686.
+ Unio (sec. Elliptio) geminus Lea, 1856 — Simpson, 1900: 733.
= Unio satillaensis Lea — B.H. Wright, 1888: [5].
= Margaron (Unio) satillaensis (Lea) — Lea, 1870: 41.