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Unio occidentalis Conrad, 1836

Conrad, 1836. Monogr. Fam. Unionidae 1(7): 64, pl. 36, fig. 1.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 253.
Type(s): TYPE LOST ANSP_UNKNOWN, Currant River, Arkansas.

Lampsilis (sec. Eurynia) occidentalis — Simpson (1900)
Lampsilis (Eurynia) occidentalis — Simpson (1914)
Ptychobranchus occidentale — Ortmann (1925)
Ptychobranchus (s.s.) occidentalis — Frierson (1927), Haas (1969)
Ptychobranchus occidentalis — Burch (1975), Gordon et al. (1979), R.I. Johnson (1980), Oesch (1984), Turgeon et al. (1988), ... Williams et al. (2017), Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023), FMCS (2025)

Ptychobranchus clintonensis Simpson, 1900

Simpson, 1900. Proc. Acad. Nat. Sci. 52: 79, pl. 5, fig. 3.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 613.
Simpson, 1914. Descr. Cat. Naiades: 335.
Type(s): HOLOTYPE USNM_124615, Little Red R., near Clinton, Ark.

Ptychobranchus clintonensis — Simpson (1900), Simpson (1900), Ortmann (1912)
Ptychobranchus clintonense — Simpson (1914)
Ellipsaria clintonensis — Utterback (1916)
Ptychobranchus (s.s.) occidentalis — Frierson (1927), Haas (1969)
Ptychobranchus occidentalis — R.I. Johnson (1980), Oesch (1984)