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Overview

Distribution

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.
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Continent: Middle-America
Distribution: Mexico (Coahuila)
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© Peter Uetz

Source: The Reptile Database

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Physical Description

Type Information

Holotype for Thamnophis exsul
Catalog Number: USNM 166423
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Amphibians & Reptiles
Sex/Stage: Female;
Preparation: Ethanol
Year Collected: 1961
Locality: San Antonio de las Alazanas, 11 mi E and 3.5 mi S of, Coahuila, Mexico
Elevation (m): 2774 to 2774
  • Holotype: Rossman, D. A. 1969. Occasional Papers of the Museum of Zoology, Louisiana State University. 39: 1, fig. 1.
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© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Amphibians & Reptiles

Source: National Museum of Natural History Collections

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Ecology

Habitat

Habitat and Ecology

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
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Source: IUCN

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2007

Assessor/s
Mendoza-Quijano, F.

Reviewer/s
Cox, N., Chanson, J.S. & Stuart, S.N. (Global Reptile Assessment Coordinating Team)

Contributor/s

Justification
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.
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Source: IUCN

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Population

Population
It is a locally common species.

Population Trend
Stable
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Threats

Major Threats
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.
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Management

Conservation Actions

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.
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