This species is known only from a single site near Atoyac, in the Sierra Madre del Sur de Guerrero, central Guerrero, Mexico, at 1,400m asl.
Habitat and Ecology
The only known specimens were found in riparian vegetation along hillsides, presumably in forest. The species seems to be terrestrial, living under logs and bark. It is not known whether or not it can withstand habitat degradation. It reproduces by direct development.
Only two specimens are known, and it was probably never common. It has not been seen since the early 1980s, despite searches.
Most of the potential habitat is now under coffee cultivation, and the remaining forest is under severe pressure from expanding agriculture and human settlements.
It has not been found in any protected area, and forest conservation along the Milpillas-Atoyac transect is urgently needed. Further survey work is required to determine whether or not this species survives in the wild.
Red List Status
Critically Endangered (CR)
Listed as Critically Endangered because its Extent of Occurrence is less than 100 km2, all individuals are known from a single location, and there is continuing decline in the extent and quality of its habitat, and in the number of mature individuals.
Gabriela Parra-Olea, David Wake, Mario García-París, James Hanken 2008. Thorius infernalis. The IUCN Red List of Threatened Species 2008: e.T59412A11933830. http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T59412A11933830.en .Downloaded on 23 February 2019