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:''Common names: northern copperhead,〔Gloyd HK, Conant R. 1990. ''Snakes of the Agkistrodon Complex: A Monographic Review''. Society for the Study of Amphibians and Reptiles. 614 pp. 52 plates. LCCN 89-50342. ISBN 0-916984-20-6.〕 copperhead, highland moccasin,〔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.'' ''Agkistrodon contortrix mokasen'' is a venomous pit viper subspecies found in the eastern United States. ==Description== The northern copperhead grows to an average length of 61-91 cm (24-36 in), with a maximum of 135 cm (53 in).〔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 dorsal scales are weakly keeled. The anal plate is single. The subcaudals are single, at least anteriorly.〔 The color pattern consists of an hourglass pattern that runs the length of the body. From above, a series of dark chestnut crossbands look narrow in the center and wider on the sides. Between the crossbands, small dark spots are often present. There are dark rounded spots at the sides of the belly. The head is a copper-red color. Juvenile specimens are lighter in color, have a yellow tail tip, and a narrow dark line that runs through the eye that divides the darker head from the lighter colored labial scales.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Agkistrodon contortrix mokasen」の詳細全文を読む スポンサード リンク
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