Original description as Cyprinodon fontinalis:
- 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. 93(2):405-416 (ffm00179) (abstract)
Conservation: Cyprinodon fontinalis is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (EN) endangered (1996). Back in 2006, the spring Ojo de Agua del Apache only had little water remaining, all the other springs where Cyprinodon fontinalis was found were dried (Personal communication, Dieter Springer, Germany). It is possible that at this point C. fontinalis has became extinct in the wild. This situation give to the long term maintenance of the populations in captivity a special meaning.