MUSSELpdb
Taxonomy
Species & Genus Richness of
freshwater mussels
by Taxonomy
Species & Genus Richness of
freshwater bivalves
by Family
Geography
Species Richness & Endemism of
freshwater mussels
by Geography
Data last updated
Wed 04 February 2026
Bivalvia | Unionida | Unionoidea | Unionidae | Ambleminae | Lampsilini | Ptychobranchus
species Ptychobranchus occidentalis (Conrad, 1836): synonymy
Synonymy
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)
Taxonomic History (since 1900)
Lampsilis (sec. Eurynia) occidentalis — Simpson (1900)
Ptychobranchus clintonensis — Simpson (1900), Simpson (1900), Ortmann (1912)
Lampsilis (Eurynia) occidentalis — Simpson (1914)
Ptychobranchus clintonense — Simpson (1914)
Ellipsaria clintonensis — Utterback (1916)
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)
