horned spider
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.