senilis, Gambusia Girard [C. F.] 1859:122 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 11; ref. 27410] Río Chihuahua, Río Grande drainage, Mexico. Lectotype: MNHN 0000-0418 [ex USNM 3503]. Lectotype selected by Huber 2019:72 [ref. 36941]. •Valid as Gambusia senilis Girard 1859 -- (Rosen & Bailey 1963:104 [ref. 7067], Lee et al. 1980:546 [ref. 22416], Rauchenberger 1989:3 [ref. 15687], Page & Burr 1991:237 [ref. 18983], Espinosa Pérez et al. 1993:46 [ref. 22290], Lucinda in Reis et al. 2003:560 [ref. 27061], Garrett & Edwards 2003:783 [ref. 27258], Nelson et al. 2004:104 [ref. 27807], Lucinda & Reis 2005:41 [ref. 29205], Miller 2006:225 [ref. 28615], Scharpf 2007:18 [ref. 30398], Meyer et al. 2010:13 [ref. 30817], Meyer et al. 2010:13 [ref. 30817], Page & Burr 2011:447 [ref. 31215], Page et al. 2013:109 [ref. 32708], Meyer 2015:100 [ref. 34698], Huber 2019:72 [ref. 36941], Page et al. 2023:146 [ref. 40505]). Current status: Valid as Gambusia senilis Girard 1859. Poeciliidae: Poeciliinae. Distribution: Southern North America: Texas (U.S.A.) [now extinct], and Atlantic slope (northern Mexico). Habitat: freshwater.