Bivalvia | Unionida | Unionoidea | Unionidae | Ambleminae | Pleurobemini | Elliptio

species Elliptio arca (Conrad, 1834): synonymy

4 specimens + 2 GenBank vouchers

Synonymy

Unio arcus Conrad, 1834

Conrad, 1834. Amer. J. Sci. 25(2): 340, pl. 1, fig. 8.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 245.
Type(s): HOLOTYPE ANSP_56784, Alabama.

Unio (sec. Elliptio) gibbosus var. arcus — Simpson (1900), Simpson (1914)
Elliptio (Eurynaia [sic]) dilatatus-arcus — Frierson (1927)
Elliptio (Eurynia) nasutus arcus — Haas (1969)
Elliptio arca — Turgeon et al. (1988), Williams et al. (1993), Vidrine (1993), Parmalee & Bogan (1998), Turgeon et al. (1998), ... Hopper et al. (2023), Hauck et al. (2023), MolluscaBase (2024), FMCS (2025), Campbell & Lydeard (2026)

Unio luridus Lea, 1852

Lea, 1852. Trans. Amer. Phil. Soc. 10 [O. 5]: 273 [29], pl. 20, fig. 29.
Lea, 1852. Proc. Amer. Phil. Soc. 5: 251. [nomen nudum]
Type(s): HOLOTYPE USNM_85253, Coosawattee R., Murray Co., Ga.

Unio (sec. Elliptio) luridus — Simpson (1900), Simpson (1914)
Elliptio (Eurynaia [sic]) dilatatus-fulvus — Frierson (1927)
Elliptio (Eurynia) nasutus fulvus — Haas (1969)
Elliptio arca — Parmalee & Bogan (1998), Williams et al. (2008), MolluscaBase (2024)

Unio rufus Lea, 1857

Lea, 1857. Proc. Acad. Nat. Sci. 9: 171.
Lea, 1858. Jour. Acad. Nat. Sci. 4 [O. 6]: 85, pl. 17, fig. 61.
Type(s): HOLOTYPE USNM_86070, Etowah R., Cass Co., Ga.

Unio (sec. Elliptio) gibbosus var. subgibbosus — Simpson (1900), Simpson (1914)
Elliptio (Eurynaia [sic]) dilatatus-fulvus — Frierson (1927)
Elliptio (Eurynia) nasutus fulvus — Haas (1969)
Elliptio arca — Parmalee & Bogan (1998), Williams et al. (2008), MolluscaBase (2024)

Unio subgibbosus Lea, 1857

Lea, 1857. Proc. Acad. Nat. Sci. 9: 169.
Lea, 1858. Jour. Acad. Nat. Sci. 4 [O. 6]: 53, pl. 6, fig. 36.
Type(s): HOLOTYPE USNM_86101, Oostanaula R., Floyd Co., Ga.

Unio (sec. Elliptio) gibbosus var. subgibbosus — Simpson (1900), Simpson (1914)
“Elliptio dilatata subgibbosa” ** — Utterback (1915)
Elliptio (Eurynaia [sic]) dilatatus-fulvus — Frierson (1927)
Elliptio (Eurynia) nasutus fulvus — Haas (1969)
Elliptio dilatata — R.I. Johnson (1980), Vidrine (1993)
Elliptio arca — Parmalee & Bogan (1998), Williams et al. (2008), MolluscaBase (2024)

Taxonomic History (since 1900)

Unio (sec. Elliptio) gibbosus var. arcus — Simpson (1900), Simpson (1914)
Unio (sec. Elliptio) gibbosus var. subgibbosus — Simpson (1900), Simpson (1914)
Unio (sec. Elliptio) luridus — Simpson (1900), Simpson (1914)
“Elliptio dilatata subgibbosa” ** — Utterback (1915)
Elliptio (Eurynaia [sic]) dilatatus — Frierson (1927)
Elliptio (Eurynaia [sic]) dilatatus-fulvus — Frierson (1927)
Elliptio (Eurynaia [sic]) dilatatus-arcus — Frierson (1927)
Elliptio (Eurynia) nasutus fulvus — Haas (1969)
Elliptio (Eurynia) nasutus arcus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)
Elliptio dilatata — R.I. Johnson (1980), Vidrine (1993)
Elliptio arca — Turgeon et al. (1988), Williams et al. (1993), Vidrine (1993), Parmalee & Bogan (1998), Turgeon et al. (1998), ... Hopper et al. (2023), Hauck et al. (2023), MolluscaBase (2024), FMCS (2025), Campbell & Lydeard (2026)