Unio arctatus Conrad, 1834
Conrad, 1834. Amer. J. Sci. 25(2): 340, pl. 1, fig. 9.
Conrad, 1834. New Fresh-Water Shells: 36, pl. 5, fig. 4.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 245.

Unio (sec. Elliptio) arctatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) arctatus — Frierson (1927), Haas (1969)
Elliptio (s.s.) arctata — R.I. Johnson (1970), Burch (1975)
Elliptio arctata — Kat (1983), Davis (1984), Turgeon et al. (1988), Williams et al. (1993), Vidrine (1993), ... Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023), Hauck et al. (2023), MolluscaBase (2024)

Unio strigosus Lea, 1840
Lea, 1840. Proc. Amer. Phil. Soc. 1: 287.
Lea, 1842. Trans. Amer. Phil. Soc. 8 [O. 3]: 198 [36], pl. 9, fig. 9.
Type(s): HOLOTYPE USNM_85890, Chattahoochee R., Columbus, Georgia.

Unio (sec. Elliptio) strigosus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) arctatus — Frierson (1927), Haas (1969)
Elliptio strigosus — Clench & Turner (1956)
Elliptio (s.s.) arctata — R.I. Johnson (1970), Burch (1975)
Elliptio arctata — Parmalee & Bogan (1998), Brim Box & Williams (2000), Williams et al. (2008), Williams et al. (2011), Williams et al. (2014), MolluscaBase (2024)

Unio tortivus Lea, 1840
Lea, 1840. Proc. Amer. Phil. Soc. 1: 287.
Lea, 1842. Trans. Amer. Phil. Soc. 8 [O. 3]: 204 [42], pl. 12, fig. 17.
Type(s): POSSIBLE SYNTYPE USNM_85674, Lee Co., Ga.

Unio (sec. Elliptio) arctatus var. tortivus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) tortivus — Frierson (1927), Haas (1969)
Elliptio strigosus — Clench & Turner (1956)
Elliptio (s.s.) arctata — R.I. Johnson (1970), Burch (1975)
Elliptio arctata — Parmalee & Bogan (1998), Brim Box & Williams (2000), Williams et al. (2008), Williams et al. (2011), Williams et al. (2014), MolluscaBase (2024)

Unio lazarus Lea, 1852
Lea, 1852. Proc. Amer. Phil. Soc. 5: 251. [nomen nudum]
Lea, 1852. Trans. Amer. Phil. Soc. 10 [O. 5]: 259 [15], pl. 14, fig. 9.
Type(s): HOLOTYPE USNM_86155, Abbeville District, S.C.

Unio (sec. Elliptio) lazarus — Simpson (1900), Simpson (1914)
Elliptio dilatata subgibbosa — Utterback (1915)
Elliptio (s.s.) arctatus — Frierson (1927), Haas (1969)
Elliptio (s.s.) arctata — R.I. Johnson (1970), Burch (1975)
Elliptio arctata — MolluscaBase (2024)

Unio perstriatus Lea, 1852
Lea, 1852. Trans. Amer. Phil. Soc. 10 [O. 5]: 255 [11], pl. 12, fig. 3.
Lea, 1852. Proc. Amer. Phil. Soc. 5: 252. [nomen nudum]
Type(s): HOLOTYPE USNM_85892, Abbeville, S.C.

Unio (sec. Elliptio) perstriatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) perstriatus — Frierson (1927), Haas (1969)
Elliptio (s.s.) arctata — R.I. Johnson (1970), Burch (1975)
Elliptio arctata — MolluscaBase (2024)

Unio gracilentus Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 9: 85.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 58 [62], pl. 3, fig. 205.
Type(s): HOLOTYPE USNM_85976, Catawba R., Gaston Co., N.C.

Unio (sec. Elliptio) perstriatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) perstriatus — Frierson (1927), Haas (1969)
Elliptio (s.s.) arctata — R.I. Johnson (1970), Burch (1975)
Elliptio arctata — MolluscaBase (2024)

Unio viridans Lea, 1859
Lea, 1859. Proc. Acad. Nat. Sci. 11: 170.
Lea, 1860. Jour. Acad. Nat. Sci. 4 [O. 8]: 337 [19], pl. 54, fig. 162.
Type(s): HOLOTYPE USNM_85579, Columbus, Ga.

Unio (sec. Elliptio) tuomeyi — Simpson (1900), Simpson (1914)
Elliptio (s.s.) arctatus — Frierson (1927), Haas (1969)
Elliptio strigosus — Clench & Turner (1956)
Elliptio (s.s.) icterina — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)
Elliptio arctata — Parmalee & Bogan (1998), Williams et al. (2008), Williams et al. (2011), Williams et al. (2014), MolluscaBase (2024)
Elliptio icterina — Brim Box & Williams (2000)

Unio perlatus Lea, 1863
Lea, 1863. Proc. Acad. Nat. Sci. 15: 193.
Lea, 1866. Jour. Acad. Nat. Sci. 6 [O. 11]: 15 [19], pl. 4, fig. 13.
Type(s): HOLOTYPE USNM_86006, Black Rock Landing, Cape Fear R., N.C.

Unio (sec. Elliptio) perstriatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) perstriatus — Frierson (1927), Haas (1969)
Elliptio (s.s.) arctata — R.I. Johnson (1970), Burch (1975)
Elliptio arctata — MolluscaBase (2024)