Acanthophis is a genus of elapid snakes. Commonly called death adders, they are native to Australia, New Guinea and nearby islands, and are among the most venomous snakes in the world. The name of the genus derives from the Ancient Greek acanthos/ἄκανθος "spine" and ophis/ὄφις "snake", referring to the spine on the death adder's tail. Seven species are listed by ITIS, though it remains unclear how many species this genus includes, with figures ranging from 4 to 15 species being quoted (see Taxonomy).