This species is known from Cerro San Felipe, northern Oaxaca and So la de Vega and La Cofradia, central Oaxaca, Mexico. It occurs at elevations from 1,540-2,650m asl and is currently known from only five localities. It might occur a little more widely.
Habitat and Ecology
From the limited information available, it appears that this frog inhabits and breeds in lower streams in montane cloud forest.
This is a rare species.
Loss of the original montane forests on the slopes of northern Oaxaca due to agriculture, logging and human settlement is a major threat. Chytridiomycosis might be a threat to this species, since it is a high-elevation stream-dweller, and declines due to the disease have already been detected amongst other species of this genus.
This species is not known to occur in any protected areas, but the protection of the Sierra de Juárez and adjacent areas in northern Oaxaca is urgently required. In view of the risk of chytridiomycosis, the status of this species should be closely monitored, and ex-situ populations might need to be established. It is protected by Mexican law under the "Special Protection" category (Pr).
Red List Status
Critically Endangered (CR)
Listed as Critically Endangered because its Extent of Occurrence is less than 100km2, its range is severely fragmented and there is a continuing decline in the extent and quality of its habitat, and a projected decline in the number of mature individuals due to the potential impacts of 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, Joseph Mendelson III 2006. Plectrohyla crassa. The IUCN Red List of Threatened Species 2006: e.T55456A11314331. http://dx.doi.org/10.2305/IUCN.UK.2006.RLTS.T55456A11314331.en .Downloaded on 18 January 2019