Popoyote

The Popoyote (Tlaloc hildebrandi), also known as the Chiapas killifish, is a killifish from the family Profundulidae which is endemic to the valley of San Cristobal de las Casas in the Chiapas Highlands in Southern Mexico. It is highly endangered because its natural habitat, which amounts to only a few square kilometers, is subject to contamination and urban sprawl from San Cristobal. It is currently being targeted by a civil society alliance for the protection of San Cristobal's wetlands.

Tlaloc hildebrandi was described in 1950 by Robert Rush Miller with the type locality given as the closed basin of San Cristóbal de las Casas in the Atlantic drainage of Chiapas at an elevation of . The specific name honours the American ichthyologist Samuel F. Hildebrand (1883-1949).