Marx & Rabb, 1965
Adenorhinos is a monotypic genus created for the venomous viper species, Adenorhinos barbouri, which is a small and exceptionally rare terrestrial species endemic to the Uzungwe and Ukinga mountains of south-central Tanzania in Africa. No subspecies are recognized.
A. barbouri is a small species reaching only 40 cm (16 in) in total length (body + tail). The head is broad, triangular and distinct from the neck. The snout is short and rounded. The head is covered with small, strongly keeled, imbricate scales. The eyes are prominent; about 1.5 times larger than the distance to the mouth. The nostril is in an extreme forward position and is part of a single nasal scale that touches the preocular scale.
The body is moderately slender, while the tail is relatively short, shorter than in the genus Atheris, and not prehensile. The dorsal scales are arranged in 20-23 rows at midbody, and are strongly keeled, except for those in the outermost rows, which are smooth. Ventral scales 116-122 and rounded. Subcaudals 19-23, single. Anal plate single.
The color pattern consists of a brown to blackish brown ground color with a pair of zigzag stripes that run dorsolaterally from the back of the head to the end of the tail. These stripes may form an irregular chain of darker rhombic blotches down the back. The tail may have a faint, black checkering. The belly color is greenish white to olive.
A terrestrial species, it is found in bushes and bamboo undergrowth on mountain slopes at 1,800 m (5,900 ft). It would seem that moist forest habitats are preferred, but it has also been found in gardens of tea farms.
No information is available regarding the composition of the venom, its toxicity, or the effects of a bite. No cases of envenomation have been recorded. However, because of the very limited distribution, bites are unlikely to occur.
A. barbouri was previously described as a member of the genus Atheris (bush vipers). It differs morphologically from the Atheris group, but recent research by Lenk et al. (2001) suggests that it is closely related to the sympatric species, Atheris ceratophora, even though it differs morphologically from all other members of the genus Atheris. Future research will show whether A. barbouri should be moved back to Atheris, or that Atheris ceratophora and A. barbouri should form a separate clade.
- List of viperine species and subspecies
- Viperinae by common name
- Viperinae by taxonomic synonyms
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