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Causus rhombeatus : ウィキペディア英語版
Causus rhombeatus

''Causus rhombeatus'' is a venomous viper species endemic to subsaharan Africa. No subspecies are currently recognized.
==Description==
With an average total length (body + tail) of , this is the largest member of the genus ''Causus''. The longest individual ever recorded was a male, in total length, collected in eastern Zimbabwe.〔
The head has a snout that is relatively blunt (i.e., more rounded than in other members of this genus), on the sides of which the nostrils are positioned. The circumorbital ring consists of 2-3 preoculars, 1-2 postoculars, and 1-2 suboculars that separate the eye from the supralabials. The temporal scales usually number 2+3, sometimes 2+4, but very rarely 2+2 or 3+3. There are 6 supralabial scales, very rarely 7. The sublabial scales usually number 7 or 10, rarely 8, and very rarely 11, 12 or 13. The first 3-4 sublabials are in contact with the anterior chin shields. The posterior chin shields are small and often indistinguishable from the gulars.〔
At midbody there are 15-21 rows of dorsal scales that are moderately keeled and have a satiny texture. The ventral scales number 120-166, the subcaudals, most of which are divided, 15-36.〔
The color pattern consists of a ground color that is usually some shade of brown (possibly pinkish or grayish-brown), but occasionally olive green. This is overlaid with a pattern of 20-30 rhombic blotches that have pale edges, as well as a sprinkling of black scales and oblique black bars on the sides.〔 Each oblique black bar is topped by one or two black spots, each with a pale centre, and strongly resembling an eye. Northern populations may be patternless,〔 making them difficult to identify, while in others the pale edges may be missing, the rhombic blotches may be a darker color, or there may even be a dark brown vertebral stripe. The head has a characteristic V-shaped mark that may be solid black, or brown with a black outline.〔

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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