Sphenodontida is an ancient group of lizard-like reptiles that enjoyed great success during the Mesozoic. The sphenodonts' kin, rhynchocephalians, or "beak heads", spread across the globe, both in Laurasia and Gondwana. Fossil rhynchocephalians are poorly-studied, but it seems they radiated into a number of forms, including the lizard-like types that are now their only legacy. Today, sphenodonts are restricted to parts of Australia, Tasmania, Aotearoa, and the surrounding islands.
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