nigrescens, Tigoma Girard [C. F.] 1856:207 [43] [Proceedings of the Academy of Natural Sciences of Philadelphia v. 8; ref. 1810] Boca Grande and Río Janos, state of Chihuahua, Mexico. Syntypes: ANSP 4183 [ex USNM 219] (1); MCZ 1804 [ex USNM 218 or 220] (1), 1805 [ex USNM 220] (1); MNHN 0000-0388 [ex USNM 220], NMW 48719 [ex USNM 220] (1); USNM 219 (2), 220 (orig. 10+, now 3, plus 1 pair of pharyngeal arches as #2774). Type catalog: Böhlke 1984:85 [ref. 13621]. On p. 43 of separate. •Valid as Gila nigrescens (Girard 1856) -- (Lee et al. 1980:168 [ref. 22416], Page & Burr 1991:74 [ref. 18983], Espinosa Pérez et al. 1993:15 [ref. 22290], Stefferud & Propst 1996:446 [ref. 25520], Gilbert 1998:120 [ref. 23395], Norris et al. 2003:24 [ref. 26757], Nelson et al. 2004:71 [ref. 27807], Scharpf 2005:19 [ref. 28940], Miller 2006:124 [ref. 28615], Page & Burr 2011:170 [ref. 31215], Page et al. 2013:71 [ref. 32708], Page et al. 2023:70 [ref. 40505]). Current status: Valid as Gila nigrescens (Girard 1856). Leuciscidae: Laviniinae. Distribution: Southern North America: New Mexico (U.S.A.) and Mexico. Habitat: freshwater.