- Merrem, 1820 Toxicoa  - Gray, 1849 Turanechis  - Cherlin, 1990 [1] Common names : saw-scaled vipers, carpet vipers. [2] Echis  is a  genus  of  venomous   vipers  found in the dry regions of  Africa , the  Middle East ,  Pakistan ,  India  and  Sri Lanka . They have a characteristic