This species occurs in Cerro San Felipe / Cerro San Luis (the type locality) in north-central Oaxaca, Mexico. Elevation 2,600-2,800 m asl. Taxonomic status of specimens provisionally assigned to this species found in Llano de las Flores and Cerro Machin remain to be validated.
Habitat and Ecology
This is a semi-arboreal species that inhabits pine-oak and fir forests, and has commonly been found under logs. It can live in somewhat disturbed forest. It reproduces by direct development.
Formerly common, this species was not found in the 1960s and the early 1970s, and, although it was recorded briefly, there have been no records since 1976 at the type locality.
The cause for declines remain a mystery. It is probably being negatively impacted by agricultural expansion, human settlements, and logging, all of which are taking place extensively within its range. However, these threats do not explain the level of decline that has been observed, because the habitat is still in quite good condition in some places. Possible explanations include climate change, and disease (such as chytridiomycosis).
It occurs in Parque Nacional Benito Juarez. There is a need for further research to establish the cause of the declines observed in this species in suitable habitat. This species is listed as "Threatened" (Amenazada) by the Mexican government.
Red List Status
Critically Endangered (CR)
Listed as Critically Endangered because its extent of occurrence is less than 100 km², all individuals are known with certainty only from a single location, and there is continuing decline in the extent and quality of its habitat, and in the number of mature individuals, in Oaxaca, Mexico.
Known only with certainty from the type locality. Similar looking individuals have been recorded at nearby locations, but the identity of these is uncertain.
Gabriela Parra-Olea, David Wake, James Hanken 2008. Pseudoeurycea unguidentis. The IUCN Red List of Threatened Species 2008: e.T59401A11926546. http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T59401A11926546.en .Downloaded on 20 January 2019