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Bothrops
''Bothrops'' is a genus of pitvipers endemic to Central and South America.〔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).〕 The generic name, ''Bothrops'', is derived from the Greek words βόθρος, ''bothros'', meaning "pit", and ώπς, ''ops'', meaning "eye" or "face", together an allusion to the heat-sensitive loreal pit organs. Members of this genus are responsible for more human deaths in the Americas than any other group of venomous snakes.〔Campbell JA, Lamar WW. 2004. ''The Venomous Reptiles of the Western Hemisphere''. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates. ISBN 0-8014-4141-2.〕 Currently, 32 species are recognized.
==Description==
These snakes range from small, never growing to more than 50–70 cm (20–28 in), to large at over in total length. Most are characterized by having a sharp ''canthus rostralis'' and an unelevated snout.〔
The arrangement of the scales on top of the head is extremely variable; the number of interorbital scales may be 3-14. Usually there are 7-9 supralabials and 9-11 sublabials. There are 21-29 rows of dorsal scales at midbody, 139-240 ventral scales, and 30-86 subcaudals, which are generally divided.〔
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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