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Sistrurus catenatus tergeminus
:''Common names: western massasauga, ground rattlesnake, Gulf coast massasauga,〔Wright AH, Wright AA. 1957. ''Handbook of Snakes of the United States and Canada''. Comstock Publishing Associates. (7th printing, 1985). 1105 pp. ISBN 0-8014-0463-0.〕 more.''
''Sistrurus catenatus tergeminus'' is a venomous pitviper subspecies found in the southwestern plains of the United States. In some areas its range overlaps that of another subspecies, ''S. c. edwardsii'', and intergrading of the two is not unknown.
==Description==
Adults range in size from . The standard length for 43 male and 63 female adult specimens was .〔 Conant (1975) mentions an average length of , with a maximum of .〔Conant R. 1975. ''A Field Guide to Reptiles and Amphibians of Eastern and Central North America''. Second Edition. First published in 1958. Houghton Mifflin Company. Boston. 429 pp. 48 plates. ISBN 0-395-19979-4. ISBN 0-395-19977-8 (pbk.).〕
The color pattern is similar to that of ''S. c. catenatus'', but paler: the dark brown blotches contrast strongly with the tan-gray or light gray ground color. The venter (belly) is light with a few dark markings.〔
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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