This species is currently known only from a one threat-defined location at a single site near Vista Hermosa in the Sierra de Juarez in north-central Oaxaca, Mexico, at 1,500 m asl. Its extent of occurrence (EOO) and area of occupancy (AOO) is 17 km2.
Habitat and Ecology
The two known specimens were collected under a log and in a bromeliad in forest (Hanken and Wake 1994; Rovito et al. 2013). This species presumably reproduces by direct development.
The species is considered to be very rare and many attempts to find it have been made without success: the holotype was collected in 1961 and the second known specimen was collected in 1998. Due to ongoing decline in the quality and extent of its habitat, the population is suspected to be decreasing.
The main threat to this species is the loss of its original forest habitat as a result of logging, expanding agricultural development and expanding human settlements.
It has not been found in any protected areas and there are no further regulations regarding its conservation.
There is an urgent need to protect the habitat of this species.
Further surveys to locate this species are required.
Red List Status
Critically Endangered (CR)
Listed as Critically Endangered because its extent of occurrence (EOO) is 17 km2, it occurs in one threat-defined location, and there is a continuing reduction in the extent and quality of its habitat. There are also only two known specimens and many attempts to find this species have been unsuccessful.
This taxon may prove to be synonymous with T. smithi (Wake and Hanken, pers. comm.)
IUCN SSC Amphibian Specialist Group 2016. Thorius insperatus. The IUCN Red List of Threatened Species 2016: e.T59413A53985809. http://dx.doi.org/10.2305/IUCN.UK.2016-1.RLTS.T59413A53985809.en .Downloaded on 14 November 2018