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The  false  horned  vipers  of  the  genus  Pseudocerastes  consist  of  3  species;  all  have  been  recorded  in  Iran.  These  include Pseudocerastes persicus, P. fieldi, and P. urarachnoides. Morphologically, the taxonomic border between P. fieldi and P. persicus is not as clear as that between P. urarachnoides and P. persicus or P. fieldi. Regarding the weak diagnostic characters differentiating P. fieldi from P. persicus and very robust characters separating P. urarachnoides from both, there may arise some uncertainty in the exact taxonomic status of P. urarachnoides and whether it should remain at the current specific level or be elevated to a distinct genus. Based on our sequence data from the mitochondrial cytochrome b gene, the taxonomic status of the 3 false horned vipers is confirmed. Although P. fieldi has equal genetic distance from P. persicus and P. urarachnoides, the spider-tailed viper is more closely related to P. persicus than P. fieldi. There are also some subdivisions among the populations of P. persicus in Iran

Molecular systematics of the genus Pseudocerastes (Ophidia: Viperidae) based on the mitochondrial cytochrome b gene