nazas, Cyprinodon Miller [R. R.] 1976:72, Fig. 1C [Bulletin of the Southern California Academy of Sciences v. 75 (no. 2); ref. 7032] Río Nazas near its mouth at San Miguel, near edge of Laguna Mayrán, Coahuila, Mexico, elevation 1092 meters. Holotype: UMMZ 197419. Paratypes: CAS 33902-03 (394, 6); TU 30616 (26); UMMZ 161674 (124), 166707 (175, 2 c&s), 196712 (207, ? now 842, 16 c&s); USNM 132618 (5). Type catalog: Bart & Taylor 1993:51 [ref. 20906]. •Valid as Cyprinodon nazas Miller 1976 -- (Espinosa Pérez et al. 1993:34 [ref. 22290], Lozano-Vilano & Contreras-Balderas 1993:307 [ref. 21105], Echelle & Echelle 1998:855 [ref. 23614], Lazara 2001:88 [ref. 25711], Lozano-Vilano 2002:21 [ref. 27832], Nelson et al. 2004:108 [ref. 27807], Miller 2006:307 [ref. 28615], Scharpf 2007:32 [ref. 30398], Page et al. 2013:107 [ref. 32708], Lozano-Vilano & De la Maza-Benignos 2016:26 [ref. 35401], Esmaeili et al. 2018:14 [ref. 36738], Page et al. 2023:142 [ref. 40505]). Current status: Valid as Cyprinodon nazas Miller 1976. Cyprinodontidae: Cyprinodontinae. Distribution: Southern North America: Coahuila (Mexico). Habitat: freshwater.