Thorius aureus


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Thorius aureus
Species Authority: Hanken and Wake, 1994

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii,v) ver 3.1
Year Published: 2008
Date Assessed: 2008-01-01
Assessor(s): Gabriela Parra-Olea, David Wake, James Hanken, Mario García-París
Reviewer(s): Global Amphibian Assessment Coordinating Team (Simon Stuart, Janice Chanson, Neil Cox and Bruce Young)
Listed as Critically Endangered because its Extent of Occurrence is less than 100 km2, all individuals are in a single location, 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.
2004 Critically Endangered

Geographic Range [top]

Range Description: This species is known from the highest peak of Cerro Pelón, and surrounding areas on the northern slopes of the Sierra de Juarez, north-central Oaxaca, Mexico, at 2,600-3,000m asl.
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: It used to be common, but now seems to have largely disappeared, despite several attempts to locate a population (there has been just one observation in the last few years).
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: It is restricted to terrestrial situations in montane pine-oak-fir forests and upper cloud forest habitat, living under stones and logs; it does not adapt to secondary habitats. It reproduces by direct development.
Systems: Terrestrial

Threats [top]

Major Threat(s): The reasons for the dramatic decline of this species remains a mystery. The species is probably being negatively impacted by logging, which is taking place within its range. However, this threat is not sufficient to explain the level of decline that has been observed.

Conservation Actions [top]

Conservation Actions: It does not occur in any protected areas. While protection of the species' remaining habitat is obviously required, research is also needed into the reasons for its dramatic decline.

Citation: Gabriela Parra-Olea, David Wake, James Hanken, Mario García-París 2008. Thorius aureus. The IUCN Red List of Threatened Species. Version 2014.3. <>. Downloaded on 01 April 2015.
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