Pseudocerastes Urarachnoides

The spider-tailed horned viper (Pseudocerastes urarachnoides) is a species of viper endemic to western Iran first described by Bostanchi et al. in 2006. It is having the most elaborate tail ornamentation of any snake yet described, save for the rattlesnakes, Crotalus and Sistrurus.
• Etymology
The specific name, urarachnoides, is derived from Ancient Greek (οὐρά tail + ἀράχνη spider + οειδής like), and refers to this snake's spider-like tail tip, as does the common name, spider-tailed horned viper.