" Cyprinodon fontinalis, new species, is described from a clus-ter of springs in the endorheic Guzman Basin of northwestern Mexico. It differs from other pupfishes in head form, coloration, and meristic charac-ters. Populations in five springs are variously distinct in coloration and meristic characters "
Reference in bibliography for species (1)
Smith, Michael & R.R. Miller. 1980. "Systematics and variation of a new cyprinodontid fish, Cyprinodon fontinalis, from Chihuahua, Mexico". Proceedings of the Biological Society of Washington. v. 93(n. 2), pp. 405-416 (ffm00179) (abstract)