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Agkistrodon piscivorus leucostoma : ウィキペディア英語版 | Agkistrodon piscivorus leucostoma
:''Common names: western cottonmouth,〔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 (hc), ISBN 0-395-19977-8 (pb).〕 water moccasin, cottonmouth,〔Wright AH, Wright AA. 1957. Handbook of Snakes. Comstock Publishing Associates. (7th printing, 1985). 1105 pp. ISBN 0-8014-0463-0.〕 more.'' ''Agkistrodon piscivorus leucostoma'' is a venomous pit viper subspecies found in the south central United States. It is the smallest of the three subspecies and tends to be darker in color. ==Description== This is the smallest of the three subspecies, both in maximum length and especially in average length. The two maximum lengths ever reported were both 62 inches (157.5 cm): the first by Wright and Wright (1957) and the second by David L. Edwards for a specimen killed north of Yazoo City in Mississippi almost 30 years later. Regarding the average length, a study by Clarke (1949) of 100 specimens showed that 86 were less than 42 inches (106.7 cm) long and 64 were less than 36 inches (91.4 cm). In another study by Barbour (1956) of 167 specimens from western Kentucky, the largest was only 39 inches (99.3 cm) and the average size was 27.5 inches (70 cm).〔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.〕 Coloration is similar to the two eastern subspecies, except that most specimens tend to become darker at a younger age. Also, the light line that borders the dark cheek strip—clearly defined in ''A. p. conanti'' and less so in ''A. p. piscivorus''—is usually not present in this subspecies. A dorsal color pattern consists of 10 to 15 dark crossbands can be seen in small specimens, as well as in some larger ones.〔
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