Bighead pupfish

The bighead pupfish (Cyprinodon pachycephalus), known in Spanish as cachorrito cabezon, is a critically endangered species of pupfish in the family Cyprinodontidae.^[2] It is endemic to an area covering less than 1 km² (0.4 sq mi) at San Diego de Alcala in the Conchos River basin, Chihuahua of Mexico. It lives in hot springs, their outflows and an impoundment pool in water that ranges at least from 25 to 49 °C (77–120 °F).^[1]

Cachorrito cabezon
Conservation status
Critically Endangered  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Cyprinodontiformes
Family:	Cyprinodontidae
Genus:	Cyprinodon
Species:	C. pachycephalus
Binomial name
Cyprinodon pachycephalus W. L. Minckley & C. O. Minckley, 1986

See also

• Cyprinodon julimes – a related pupfish that also lives in hot springs in Mexico