Thorius boreas
Boreas Pigmy Salamander
family: Plethodontidae
subfamily: Hemidactyliinae

© 2018 Vicente Mata-Silva (1 of 9)
Conservation Status (definitions)
IUCN (Red List) Status Endangered (EN)
Other International Status None
National Status None
Regional Status None



View distribution map using BerkeleyMapper.

From the IUCN Red List Species Account:


Range Description

This species is known only from Cerro Pelon and Llano de las Flores in the Sierra de Juarez, north-central Oaxaca, Mexico, at 2,800-3,000m asl.

Habitat and Ecology

It is a terrestrial inhabitant of pine-oak and fir forests often at forest edges. It reproduces by direct development.


It used to be moderately common, but has undergone declines, especially on Cerro Pelon.

Population Trend


Major Threats

The reason for the dramatic decline in the species remains a mystery. Although logging is certainly taking place, this is not sufficient to explain the extent of the declines that have taken place.

Conservation Actions

It does not occur in any protected areas, making the protection of the remaining habitat within the range of this species an urgent priority. There is also a need for further research to investigate the reasons for the decline of the species in good habitat.

Red List Status

Endangered (EN)


Listed as Endangered because its Extent of Occurrence is less than 5,000 km2, all individuals are in fewer than five locations, and there is continuing decline in the extent and quality of its habitat, and in the number of mature individuals, in north-central Oaxaca, Mexico.


Gabriela Parra-Olea, David Wake, James Hanken, Mario García-París 2008. Thorius boreas. The IUCN Red List of Threatened Species 2008: e.T59409A11932668. .Downloaded on 15 February 2019


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