occidentalis, Heterandria Baird [S. F.] & Girard [C. F.] 1853:390 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 6; ref. 15636] Río Santa Cruz of the Río Gila, Mexico [not Rio Santa Cruz, Tucson, Arizona, U.S.A.]. Syntypes: ANSP 6972 (1). Type catalog: Böhlke 1984:144 [ref. 13621]. •Valid as Poeciliopsis occidentalis (Baird & Girard 1853) -- (Rosen & Bailey 1963:137 [ref. 7067], Lee et al. 1980:553 [ref. 22416], Page & Burr 1991:239 [ref. 18983], Espinosa Pérez et al. 1993:52 [ref. 22290], Swift et al. 1993:123 [ref. 22379], Fuller et al. 1999:315 [ref. 25838], Lucinda in Reis et al. 2003:570 [ref. 27061], Nelson et al. 2004:105 [ref. 27807], Lucinda & Reis 2005:43 [ref. 29205], Miller 2006:246 [ref. 28615], Scharpf 2007:21 [ref. 30398] with subspecies, Minckley & Marsh 2009:246 [ref. 31114], Page & Burr 2011:451 [ref. 31215], Page et al. 2013:110 [ref. 32708], Meyer 2015:293 [ref. 34698], Huber 2019:129 [ref. 36941], Conway et al. 2019:114 [ref. 37045]). Current status: Valid as Poeciliopsis occidentalis (Baird & Girard 1853). Poeciliidae: Poeciliinae. Distribution: New Mexico and Arizona (U.S.A.) and Pacific slope of northern Mexico. Habitat: freshwater.