This species is known only from the Atlantic slopes of the Sierra de Juarez, Pena Verde, and at Sierra de Mazateca on the Guelatao-Vista Hermosa transect, north-central Oaxaca, Mexico. Its altitudinal range is 1,530-2,050m asl. The species is presumed to occur between the known localities in appropriate habitat, but further data are required.
Habitat and Ecology
The species inhabits undisturbed cloud forests, being found in bromeliads and other epiphytic plants, and in leaf-litter, and does not tolerate disturbance of its habitat. It is terrestrial and reproduces by direct development.
It is still occasionally recorded but considered to be very rare.
The major threat to the species is loss of habitat due to logging, expanding agricultural activity, and human settlements.
It has not been recorded in any protected areas, making formal protection of its remaining cloud forest habitat an urgent priority.
Red List Status
Listed as Endangered because its Extent of Occurrence is less than 5,000 km2, it is severely fragmented, and there is continuing decline in the extent and quality of its habitat in Oaxaca, Mexico.
Gabriela Parra-Olea, David Wake, James Hanken 2008. Thorius adelos. The IUCN Red List of Threatened Species 2008: e.T59233A11904017. http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T59233A11904017.en