Thamnophis exsul


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Thamnophis exsul
Species Authority: Rossman, 1969

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2007
Date Assessed: 2007-03-01
Assessor(s): Mendoza-Quijano, F.
Reviewer(s): Cox, N., Chanson, J.S. & Stuart, S.N. (Global Reptile Assessment Coordinating Team)
Listed as Least Concern because, although its extent of occurrence is much less than 5,000 km², it is common, can adapt to slightly modified habitats, can move between habitat fragments and does not appear to be in decline.

Geographic Range [top]

Range Description: This species is endemic to the Sierra Madre Oriental of eastern Mexico, where it has been recorded from an isolated population in southeastern Coahuila, and a second population in southern Nuevo Leon and southwestern Tamaulipas. It occurs between around 2,650 and 2,860 m asl.
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: It is a locally common species.
Population Trend: Stable

Habitat and Ecology [top]

Habitat and Ecology: This species is found in primary and secondary dry pine-oak forests and grasslands, where it can be found under logs, rocks and other ground cover. Animals have been found hunting for prey under the leaves of agaves. It can be found in disturbed areas such as cattle pasture. It is a viviparous species.
Systems: Terrestrial

Threats [top]

Major Threat(s): It is locally threatened by severe habitat fragmentation through conversion to agricultural use in parts of its range, however, it can generally move between habitat fragments.

Conservation Actions [top]

Conservation Actions: It is present in the Parque Nacional Cumbres de Monterrey and Parque Nacional Sierra Pena Nevada. Further studies are needed into the distribution, ecology and natural history of this species.

Citation: Mendoza-Quijano, F. 2007. Thamnophis exsul. The IUCN Red List of Threatened Species. Version 2014.3. <>. Downloaded on 31 March 2015.
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