1. Only extant member of the order Rhynchocephalia of large spiny lizard-like diapsid reptiles of coastal islands off New Zealand
   "The Sphenodon punctatus is often called a 'living fossil' due to its ancient lineage";
   - tuatara

Type of: diapsid, diapsid reptile

Part of: genus Sphenodon, Sphenodon

Encyclopedia: Sphenodon punctatus