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Sistrurus ravus : ウィキペディア英語版 | Sistrurus ravus
:''Common names: Mexican pigmy rattlesnake,〔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.〕 Mexican pygmy rattlesnake,〔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.〕 more.'' ''Sistrurus ravus'' is a venomous pitviper species, found only in Mexico. Three subspecies are currently recognized, including the nominate subspecies described here. ==Description== Adults of this species usually grow to a length of , but may reach more than . They are moderately stout in build.〔 The distinguishing characteristics for ''S. r. ravus'' include parietal scales that are highly variable in shape and particularly large, less than 3 prefoveals, 21 midbody dorsal scales, 2–4 tail bands and a relatively large rattle.〔
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