Thorius narismagnus 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Amphibia Caudata Plethodontidae

Scientific Name: Thorius narismagnus
Species Authority: Shannon & Werler, 1955
Common Name(s):
English San Martin Pigmy Salamander
Taxonomic Source(s): Frost, D.R. 2015. Amphibian Species of the World: an Online Reference. Version 6.0. New York, USA. Available at:

Assessment Information [top]

Red List Category & Criteria: Critically Endangered (Possibly Extinct) B1ab(iii,v) ver 3.1
Year Published: 2008
Date Assessed: 2008-01-01
Assessor(s): Gabriela Parra-Olea, David Wake, Mario García-París, James Hanken
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, its distribution is severely fragmented, and there is continuing decline in the extent and quality of its habitat, and in the number of mature individuals, in southern Veracruz, Mexico. Further information may show this species to be Extinct.
Date last seen: 1980s
Previously published Red List assessments:
2004 Critically Endangered (CR)

Geographic Range [top]

Range Description: This species is known only with certainty from Volcán San Martín in the Sierra de Los Tuxtlas, southern Veracruz, Mexico, at 500-1,200m asl. It may be present on the adjacent Santa Marta, however this requires confirmation.
Countries occurrence:
Possibly extinct:
Lower elevation limit (metres): 500
Upper elevation limit (metres): 1200
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: This species appears to have undergone a population collapse. It was never common, and was last seen in the 1980s despite repeated attempts to find it.
Current Population Trend: Decreasing
Additional data:
Population severely fragmented: Yes

Habitat and Ecology [top]

Habitat and Ecology: It is a terrestrial species that inhabits lowland and intermediate tropical forest, being found under rotten logs and among leaf-litter, and especially under fallen bromeliads. It presumably reproduces by direct development.
Systems: Terrestrial

Threats [top]

Major Threat(s): Serious habitat loss is taking place in the range of this species due to subsistence agriculture, logging, and human settlement. However, this might not be sufficient to explain its apparent disappearance.

Conservation Actions [top]

Conservation Actions: It occurs in Parque Nacional San Martín and may be present in the Parque Nacional Santa Marta. While continued protection and maintenance 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, Mario García-París, James Hanken. 2008. Thorius narismagnus. The IUCN Red List of Threatened Species 2008: e.T59420A11937237. . Downloaded on 28 May 2016.
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