Agkistrodon piscivorus leucostoma
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| Agkistrodon piscivorus leucostoma (Troost, 1836) |
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Agkistrodon piscivorus leucostoma is a venomous pitviper subspecies[4] found in the south central United States.
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[edit] Description
This is the smallest of the three A. piscivorus subspecies, rarely growing beyond 42 inches (1,100 mm) in length. They have a broad, triangular shaped head, small eyes with vertical pupils, and heat sensing pits on either side of the nose.
Its color pattern is typically dark; either black, dark brown, or a dark olive green, with a muddy appearance. Sometimes muted banding is present. Juveniles have a more striking appearance, with distinctive light and dark banding and a bright yellow-green tail tip. As they age, the banding and color on the tail tip fade. They get their name from the white interior of their mouth, which can be seen if the snake is threatened. Often the main response to being cornered is for the snake to lift up its head and gape its mouth.
[edit] Common names
Western cottonmouth, water moccasin, cottonmouth, (black) moccasin, blunt-tail moccasin, (northern) cottenmouth moccasin, stump-tail (water) moccasin, viper, western cottonmouth moccasin.[3]
[edit] Distribution & Habitat
A. p. leucostoma is found from the eastern half of Texas, across the southern states of Arkansas, Louisiana, Mississippi and Alabama, into Georgia, north to the western Tennessee, western Kentucky, southwestern corner of Indiana, southern Illinois, southern Missouri, southeast Kansas, and eastern Oklahoma.
Cottonmouths are rarely found far from a permanent water source, such as a slow moving stream, edge of a lake, pond, swamp, or even brackish tidal estuaries. Throughout much of their range, they are found in open flatwood pine forests or bald cypress swamps.
The type locality given is "western district of Tennessee." Schmidt (1953) proposed that this be emended to "10 miles northeast of Bolivar, Hardeman County, Tennessee."[1]
[edit] Behavior & Diet
Cottonmouths have an undeserved reputation for being aggressive, but in actuality, they prefer to flee from a threat if given the opportunity. If cornered, they may gape their mouth, but will generally only strike as a last resort, or if harassed or physically provoked. In behavioral tests at the University of Georgia, it was found that only 13 out of 36 test specimens actually bit when provoked.[1] Only 7% of snake bite cases in the state of Texas involve cottonmouths.
Another common myth about cottonmouths is that they "nest" in large groups. This is untrue. Cottonmouths are solitary creatures, and if there is more than one in an area, it is either breeding season or simply that the habitat is such that it can support several animals.
Frogs, fish, small mammals, other snakes, birds and even carrion make up the cottonmouth's diet. They generally will not pass up an easy meal, so even fish on stringers may be taken. In order to consume fish and frogs, they are quite able to bite under water.
[edit] Reproduction
Females reach sexual maturity at three years of age; males at two years. Mating occurs in the spring. They are ovoviviparous, giving birth to an average of six 6-10 inch young in the early fall. Average lifespan is approximately 10 years.
[edit] See also
- List of crotaline species and subspecies
- Crotalinae by common name
- Crotalinae by taxonomic synonyms
- Snakebite
[edit] References
- ^ a b McDiarmid RW, Campbell JA, Touré T. 1999. Snake Species of the World: A Taxonomic and Geographic Reference, vol. 1. Herpetologists' League. 511 pp. ISBN 1-893777-00-6 (series). ISBN 1-893777-01-4 (volume).
- ^ 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 0-395-19979-8 (pbk.).
- ^ a b Wright AH, Wright AA. 1957. Handbook of Snakes. Comstock Publishing Associates. (7th printing, 1985). 1105 pp. ISBN 0-8014-0463-0.
- ^ Agkistrodon piscivorus leucostoma (TSN 209504). Integrated Taxonomic Information System. Retrieved on 31 May 2007.
[edit] External links
- Agkistrodon piscivorus at the TIGR Reptile Database. Accessed 12 December 2007.
- A. piscivorus at Herps of Texas. Accessed 31 May 2007.
- A. p. leucostoma at The Center for Reptile and Amphibian Conservation and Management. Accessed 31 May 2007.
- A. p. leucostoma at Texas Parks & Wildlife. Accessed 31 May 2007.
- A. p. leucostoma at Houston Herpetological Supply. Accessed 31 May 2007.
- A. p. leucostoma at Snakes of Louisiana. Accessed 31 May 2007.
- A. p. leucostoma at Saint Louis Zoo. Accessed 31 May 2007.
