Belongs within: Lepidosauria. The Sphenodontia are a clade of lizard-like reptiles that were abundant in the Triassic and Jurassic. They subsequently declined, and are represented in the modern fauna only by the tuatara Sphenodon species of New Zealand. Many extinct sphenodontians would have closely resembled the modern species, but Pleurosaurus from the Late Jurassic of… Continue reading Sphenodontia