This species is known only from near Ayutla, east-central Oaxaca, Mexico, at 2,100 m asl. It is only known from one threat-defined location and its extent of occurrence (EOO) is 13 km2.
Habitat and Ecology
This species is a terrestrial inhabitant of pine-oak forest and madroño (arbutus forest). It can tolerate some habitat disturbance, as evidenced by the fact that a handful of small subpopulations survive in several tiny fragments of remaining habitat. It breeds by direct development and is not dependent upon water.
It is an uncommon species, having last been seen in 1999 (Lamoreux et al. 2015). Due to ongoing decline in the extent and quality of habitat, the population is suspected to be decreasing.
The major threat to this species is the extensive loss of habitat (only small fragments of original habitat remain) that has taken place due to agriculture (including slash and burn practices), logging and human settlement.
This species has not been recorded in any protected areas. It is listed as "Threatened" (Amenazada) by Mexican law.
There is an urgent need for the protection of forested areas near Ayutla.
Research is needed on its population size and distribution and to monitor its population trends.
Red List Status
Critically Endangered (CR)
Listed as Critically Endangered because its extent of occurrence (EOO) is 13 km2, it occurs in a single threat-defined location, and there is a continuing decline in the extent and quality of its habitat.
IUCN SSC Amphibian Specialist Group 2016. Pseudoeurycea mystax. The IUCN Red List of Threatened Species 2016: e.T59388A53983330. http://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T59388A53983330.en .Downloaded on 17 January 2019