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Crotalus oreganus concolor

Crotalus oreganus concolor
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Viperidae
Subfamily: Crotalinae
Genus: Crotalus
Species: C. oreganus
Subspecies: C. o. concolor
Trinomial name
Crotalus oreganus concolor
Woodbury, 1929
  • Crotalus concolor - Woodbury, 1929
  • Crotalus confluentus decolor - Klauber, 1930
  • Crotalus confluentus concolor - Woodbury, 1930
  • Crotalus viridis concolor - Klauber, 1936
  • Crotalus viridis decolor - Gloyd, 1940
  • Crotalus viridis decolor - Klauber, 1956
  • Crotalus viridis concolor - Klauber, 1972[1]
Common names: midget faded rattlesnake, yellow rattlesnake, faded rattlesnake.[2]

Crotalus oreganus concolor is a venomous pitviper subspecies[3] found in the western United States. A small species known for its faded color pattern.



Grows to a maximum length of 750 mm. The smallest gravid female measured was 522 mm.[4]

The color pattern consists of a pinkish, pale brown, yellow-brown, straw-colored, reddish or yellow-brown ground color, overlaid with a series of brown elliptical or rectangular dorsal blotches. However, most specimens are gray or silvery. In juveniles the pattern is distinct, but becomes faded in adults, almost to the point where it is indistinguishable from the ground color.[5]

Geographic range

Found in the United States in the Colorado and Green River basins. This area covers southwestern Wyoming, Utah east of long. 111° West (excluding the southeastern corner) and extreme east-central Colorado.[4] The type locality given is "King's Ranch, Garfield Co., at the base of the Henry Mts [Utah]."[1]

See also


  1. ^ 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).
  2. ^ Wright AH, Wright AA. 1957. Handbook of Snakes. Comstock Publishing Associates. (7th printing, 1985). 1105 pp. ISBN 0-8014-0463-0.
  3. ^ Crotalus oreganus concolor (TSN 683064). Integrated Taxonomic Information System. Accessed on 11 August 2007.
  4. ^ a b Klauber LM. 1997. Rattlesnakes: Their Habitats, Life Histories, and Influence on Mankind. Second Edition. 2 volumes. Reprint, University of California Press, Berkeley. ISBN 0-520-21056-5.
  5. ^ Campbell JA, Lamar WW. 2004. The Venomous Reptiles of the Western Hemisphere. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates. ISBN 0-8014-4141-2.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Crotalus_oreganus_concolor". A list of authors is available in Wikipedia.
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