Crotalus willardi obscurus
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| Crotalus willardi obscurus Harris & Simmons, 1974 |
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Crotalus willardi obscurus is a venomous pitviper subspecies[4] found in northwestern Mexico and the southwestern United States.This is the only venomous snake listed as Threatened by the U.S. Fish and Wildlife Service.[3]
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[edit] Description
The color pattern consists of a gray or brownish gray ground color with scattered dark punctations. The facial stripes that are characteristic of this species may be completely absent. In the Sierra San Luis population, traces of the pale upper facial stripe may be visible on the posterior upper labials, but there is no pale stripe on the lower labials.[5]
[edit] Geographic range
Found in the Animas and adjacent Peloncillo Mountains in extreme southeastern Arizona and extreme southwestern New Mexico in the United States, and in the Sierra San Luis of extreme northwestern Chihuahua and extreme northeastern Sonora in Mexico.[5] The type locality given is "one canyon in the Animas Mountains" (New Mexico, USA).[1]
[edit] Conservation status
This is the only venomous snake that is listed as Threatened by the U.S. Fish and Wildlife Service, and is therefore afforded protection by the Endangered Species Act. It is listed because of its limited geographic range and the supposed threat to it of overcollection for the reptile trade.[3]
[edit] See also
- List of crotaline species and subspecies
- Crotalus by common name
- Crotalus by taxonomic synonyms
- Crotalinae by common name
- Crotalinae by taxonomic synonyms
- Snakebite
[edit] References
- ^ a b McDiarmid RW, Campbell JA, Touré T. 1999. Snake Species of the World: A Taxonomic and Geographic Reference, vol. 1. Herpetologists' League. 511 pp. ISBN 1-893777-00-6 (series). ISBN 1-893777-01-4 (volume).
- ^ Mehrtens JM. 1987. Living Snakes of the World in Color. New York: Sterling Publishers. 480 pp. ISBN 0-8069-6460-X.
- ^ a b c Crotalus willardi obscurus at U.S. Fish and Wildlife Service. Accessed 13 August 2007.
- ^ Crotalus willardi obscurus (TSN 202178). Integrated Taxonomic Information System. Retrieved on 13 August 2007.
- ^ a b Campbell JA, Lamar WW. 2004. The Venomous Reptiles of the Western Hemisphere. 2 volumes. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates. ISBN 0-8014-4141-2.
[edit] External links
- Crotalus willardi at the TIGR Reptile Database. Accessed 13 August 2007.
- Crotalus willardi obscurus at Mexico Herps. Accessed 13 August 2007.
