Original description as Cyprinodon pachycephalus:
- Minckley, Wendell L & C.O. Minckley. 1986. "Cyprinodon pachycephalus, a new species of pupfish (Cyprinodontidae) from the Chihuahuan Desert of northern Mexico". Copeia. v. 1986(n. 1), pp. 184-192 (ffm00183)
Conservation: Cyprinodon pachycephalus is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (CR) critically endangered (1996).