humilis, Gambusia Günther [A.] 1866:335 [Catalogue of the fishes in the British Museum v. 6; ref. 1983] Matamoros, Tamaulipas, Atlantic slope of Mexico. Syntypes: ANSP 6973 (1), MCZ 1309 (1), MNHN [ex USNM 3506] (1). Replacement name for Gambusia gracilis Girard 1859, secondarily preoccupied by Xiphophorus gracilis Heckel 1848. •Synonym of Gambusia affinis (Baird & Girard 1853) -- (Rosen & Bailey 1963:95 [ref. 7067], La Rivers 1994:532 [ref. 23389], Lucinda in Reis et al. 2003:558 [ref. 27061], Meyer 2015:54 [ref. 34698], Huber 2019:65 [ref. 36941]). Replacement Name. Current status: Synonym of Gambusia affinis (Baird & Girard 1853). Poeciliidae: Poeciliinae. Habitat: freshwater, brackish.