either of two primitive, amphibious, lizardlike reptiles (Sphenodon punctatus or S. guntheri) of the SW Pacific, with a row of spines along the back and a well-developed third eye: they are the only rhynchocephalians still in existence
Either of two nocturnal lizardlike reptiles (Sphenodon punctatus or S. guntheri) that are found only on certain islands off New Zealand and are the only extant members of the Rhynchocephalia, an order that flourished during the Mesozoic Era. Also called sphenodon.