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Spider-tailed horned viper
The spider-tailed horned viper (''Pseudocerastes urarachnoides'') is a species of viper endemic to western Iran which was described in 2006. The head looks very similar to that of other ''Pseudocerastes'' species in the region but it has a unique tail that has a bulb-like end and bordered by long drooping scales that give it the appearance of a spider. The tail tip is waved around and used to lure insectivorous birds within striking range.
==Description ==
Like other vipers in the genus ''Pseudocerastes'' the scales above the eyes rise up to give a horned appearance. A specimen had been collected in 1968 as part of the Second Street Expedition to Iran and deposited in the Field Museum of Natural History at Chicago, identified as ''Pseudocerastes persicus''. It was however found to be distinct and described as a new species in 2006. The species is distinguished by a number of characters. There are about 16 to 17 scales between the horns and the scales on the body above are rougher than on other species in the genus. There are 15 pairs of subcaudal scales and the scales on the sides of the tail are elongated and appear like appendages of an arthropod. The tip of the tail is inflated into a bulb-like shape.〔
The tail resembles a spider or other arachnid and the authors who described the species speculated that it was used a lure to attract birds as a digested lark had been found in the stomach of the paratype specimen. The tip of the tail is used as a lure in several species of snake including ''Bitis caudalis'', ''Crotalus cerastes'', ''Sistrurus catenatus'', ''Agkistrodon contortrix'', ''Acanthophis antarcticus'', ''Acanthophis praelongus'', and ''Morelia viridis'' but none of these examples have the unique elongated scales that give it the appearance of arthropod appendages.〔 The actual use of the tail to lure birds was confirmed by later studies in the field.
This species overlaps in distribution with ''P. fieldi'' in Gilan-e-Gharb, next to Qasr-e-Shirin, Kermanshah and with ''P. persicus'' in Bina and Bijar, Ilam province. Molecular studies based on cytochrome b show it to be evolutionarily closer to ''Pseudocerastes persicus'' than to ''P. fieldi''.
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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