alvarezdelvillari, Cyprinella Contreras-Balderas [S.] & Lozano-Vilano [M. de L.] 1994:898, Fig. 1 [Copeia 1994 (no. 4); ref. 22061] Balneario La Concha, 9 kilometers southwest of Peñón Blanco, Durango, Mexico. Holotype: UANL 8302. Paratypes: AMNH 47834 [ex UANL 8303 & 11131] (4); BMNH 1990.6.23.3-6 [ex UANL 8310] (4); CAS [ex UANL 8303 & 11131] (4), 54426 (1); IPN P4436 [ex UANL 8310] (4); TNHC 17459 [ex UANL 8310] (4); UANL 8303 (276, now 256), 8310 (192, now 168), 8315-16 (12, 1), 8266 (1), 11131 (2, ? now 0); TU 157269 [ex UANL 8310] (4); UALA [ex UANL 8310] 9115.01 (4); UMMZ [ex UANL 8303 & 11131] 214693 (8); UNAM [ex UANL 8303 & 11131] 3239 (4); USNM 308111 [ex UANL 8310] (4). Type catalog: Gilbert 1998:38 [ref. 23395], Contreras-Balderas et al. 1998:2-3 [ref. 23752]. •Valid as Cyprinella alvarezdelvillari Contreras-Balderas & Lozano-Vilano 1994 -- (Gilbert 1998:38 [ref. 23395], Nelson et al. 2004:68 [ref. 27807], Miller 2006:109 [ref. 28615], Scharpf 2005:12 [ref. 28940], Schönhuth & Mayden 2009:78 [ref. 38584], Page et al. 2013:69 [ref. 32708], Page et al. 2023:68 [ref. 40505]). Current status: Valid as Cyprinella alvarezdelvillari Contreras-Balderas & Lozano-Vilano 1994. Leuciscidae: Pogonichthyinae. Distribution: Southern North America: tributary of the Nazas River, endorheic Río Penon Blanco system, from Ojo la Concha spring to 8 km downstream (Durango, Mexico) endemic. Habitat: freshwater.