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:''Common names: hump-nosed vipers,〔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.〕 hump-nosed pit vipers.〔Brown JH. 1973. Toxicology and Pharmacology of Venoms from Poisonous Snakes. Springfield, Illinois: Charles C. Thomas. 184 pp. LCCCN 73-229. ISBN 0-398-02808-7.〕'' ''Hypnale'' is a genus of venomous pitvipers endemic to Sri Lanka and southwestern India.〔 Three monotypic species are currently recognized (no subspecies). All members have more or less upturned snouts that produce a hump-nosed effect.〔 ==Description== Members of this genus grow to a maximum total length of (for ''H. hypnale''). The body is stout, but relatively slender compared to most other crotalines. The tail length accounts for 14-18% of total length in males, 11-16% in females.〔 The snout is more or less upturned, with two species having a wart-like protuberance at the tip that is covered with tiny scales. The anterior head shields are strongly fragmented, but the frontal scale, supraoculars and parietals are complete and quite large. The nasal scale is single, but it may have a groove that extends towards its upper edge. There are two preoculars and 2-4 postoculars. The loreal scale is single, but extends across the ''canthus rostralis'' so that it can be seen from above. The supralabials and sublabials both number 7-9. Bordering the supralabials are 3-4 enlarged temporal scales, above which are 3-5 irregular rows of temporal scales. There is one pair of chin shields, each of which is slightly longer than it is wide.〔 At midbody there are 17 rows of dorsal scales, which are weakly keeled. Apical pits are present, but very difficult to see. The keels are faint or may be entirely absent on the first two scale rows bordering the ventrals. The ventral scales number 120-158, while the subcaudals vary in number from 28-48 (almost all are paired).〔 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「Hypnale」の詳細全文を読む スポンサード リンク
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