Vipera albicornuta sp. n. is described on specimens from the Zanjan valley, between Tabriz and Teheran, Iran. The new species, which belongs to the raddei group, is distributed in northern Iran and is geographically separated from both V raddei and V latifii and differ from these taxa in colour, pattern, size, some scalation and hemipenal characters.
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Nilson et al. (1985) studied this question.
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