This species is known from the Sierra Madre del Sur in Oaxaca and Guerrero, Mexico, in the vicinity of San Gabriel Mixtepec, south-western Oaxaca and Puerto del Gallo, Guerrero, Mexico, at elevations of 1,600-1,900m asl. It probably occurs more widely than current records suggest, especially in areas between known sites.
Habitat and Ecology
A stream-breeding species, it occurs in pine-oak forest, and individuals are often found on low vegetation such as ferns and bushes along mountain streams.
This was never a common species, but it appears to have gone into serious decline, and has not been recorded since 1984. Recent surveys to locate it within known localities have been unsuccessful.
Clearance of the original forest cover for conversion to agricultural land in the region is a threat to this species. However, the species has also disappeared in suitable habitat, probably due to chytridiomycosis.
The range of this species does not include any protected areas, and urgent protection of the forested areas surrounding San Gabriel Mixtepec and Puerto del Gallo is recommended. It is a very high priority to conduct surveys to relocate this species and determine its current population status; if the threat of chytrid proves to be real, then surviving individuals might need to form the basis for a captive-breeding programme. This species is protected by Mexican law under the "Special Protection" category (Pr).
Red List Status
Critically Endangered (CR)
Listed as Critically Endangered because of a drastic population decline, estimated to be more than 80% over the last three generations, inferred from the apparent disappearance of most, or all, of the population, probably due to chytridiomycosis.
This species was previously included in the genus Hyla but has recently been moved to the genus Plectrohyla (Faivovich et al. 2005).
Georgina Santos-Barrera, Luis Canseco-Márquez 2004. Plectrohyla thorectes. The IUCN Red List of Threatened Species 2004: e.T55673A11335985. http://dx.doi.org/10.2305/IUCN.UK.2004.RLTS.T55673A11335985.en .Downloaded on 19 January 2019