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Crotalus viridis viridis : ウィキペディア英語版
Crotalus viridis

''Crotalus viridis'' (Common names: prairie rattlesnake, western rattlesnake, Great Plains rattlesnake,〔Wright AH, Wright AA. 1957. Handbook of Snakes. Comstock Publishing Associates. (7th printing, 1985). 1105 pp. ISBN 0-8014-0463-0.〕 and others) is a venomous pit viper species native to the western United States, southwestern Canada, and northern Mexico. Currently, two subspecies are recognized, including the nominate subspecies described here.〔
==Taxonomy==
The taxonomic history of this species is convoluted. Previously, seven other ''C. viridis'' subspecies were also recognized, including ''C. v. abyssus'', ''C. v. caliginis'', ''C. v. cerberus'', ''C. v. concolor'', ''C. v. helleri'', ''C. v. lutosus'' and ''C. v. oreganus''. However, in 2001 Ashton and de Queiroz described their analysis of the variation of mitochondrial DNA across the range of this species. Their results agreed broadly with those obtained by Pook ''et al.'' (2000). Two main clades were identified, east and west of the Rocky Mountains, which they argued were actually two different species: on the one hand ''C. viridis'', including the conventional subspecies ''C. v. viridis'' and ''C. v. nuntius'', and on the other ''C. oreganus'', including all the other traditional subspecies of ''C. viridis''. The authors retained the names of the traditional subspecies, but emphasized the need for more work to be done on the systematics of ''C. oreganus''.〔〔(Viperidae - Crotalinae - 2001 Publications ) at (Wolfgang Wüster ), (School of Biological Sciences ), (Bangor University ). Accessed 7 April 2008.〕〔Pook CE, Wüster W, Thorpe RS. 2000. Historical biogeography of the western rattlesnake (Serpentes: Viperidae: ''Crotalus viridis''), inferred from mitochondrial DNA sequence information. Molecular Phylogenetics and Evolution, 15: 269-282. (PDF ) at (Wolfgang Wüster ), (School of Biological Sciences ), (Bangor University ). Accessed 7 April 2008.〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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