atrorus, Cyprinodon Miller [R. R.] 1968:7, Fig. 2 [Occasional Papers of the Museum of Zoology University of Michigan No. 659; ref. 7905] South of Cuatro Ciénegas, Coahuila, Mexico (specific locality unkown). Holotype: UMMZ 130380. Paratypes: MCZ 38004 [ex UMMZ 130391] (6); UMMZ 130381 (575, 5 c&s), 130391 (368). •Valid as Cyprinodon atrorus Miller 1968 -- (Espinosa Pérez et al. 1993:32 [ref. 22290], Lozano-Vilano & Contreras-Balderas 1993:307 [ref. 21105], Echelle & Echelle 1998:855 [ref. 23614], Lazara 2001:82 [ref. 25711], Lozano-Vilano 2002:21 [ref. 27832], Nelson et al. 2004:108 [ref. 27807], Miller 2006:298 [ref. 28615], Scharpf 2007:31 [ref. 30398], Page et al. 2013:107 [ref. 32708], Lozano-Vilano & De la Maza-Benignos 2016:16 [ref. 35401], Esmaeili et al. 2018:10 [ref. 36738]). Current status: Valid as Cyprinodon atrorus Miller 1968. Cyprinodontidae: Cyprinodontinae. Distribution: Coahuila, Mexico. Habitat: freshwater.