species Quadrula couchiana (Lea, 1860): synonymy

Unio couchianus Lea, 1860

Lea, 1860. Proc. Acad. Nat. Sci. 12: 305.
Lea, 1860. Jour. Acad. Nat. Sci. 4 [O. 8]: 371 [53], pl. 66, fig. 196.
Type(s): LECTOTYPE [AS HOLOTYPE] USNM_85728 (by R.I. Johnson, 1974: 38), Rio Salado, Mexico.

Quadrula (sec. Theliderma) couchiana — Simpson (1900)
Unio (Pleurobema) couchianus — Martens (1900)
Quadrula (sec. Theliderma) (Group of Q. lachrymosa [sic]) couchiana — Simpson (1914)
Quadrula (Bullata) couchiana — Frierson (1927)
Quadrula (sec. Amphinaias) couchiana — Thiele (1934)
Quadrula (Pustulosa) couchiana — Haas (1969)
Quadrula (Amphinaias) couchianus — Haas (1969)
Quadrula couchiana — Turgeon et al. (1988), Williams et al. (1993), Howells et al. (1996), Turgeon et al. (1998), R.I. Johnson (1999), ... Czaja et al. (2023), Neemuchwala et al. (2023), Hopper et al. (2023), FMCS (2025), Cummings et al. (2025)
Amphinaias couchiana — IUCN (1996), Graf & Cummings (2007), Cummings & Graf (2010)
Quadrula counchiana [sic] — Contreras-Arquieta (2000)

Quadrula counchiana Contreras-Arquieta, 2000

(error for Unio couchianus Lea, 1860)
‘Lea’ Contreras-Arquieta, 2000. Mexicoa 2(1): 44.