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Which reptile order do tuatara belong to?

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tuatara (Sphenodon punctatus) — tuatara The species is the sole living member of the reptile order Rhynchocephalia.

Tuatara belong to the reptile order Rhynchocephalia (sometimes referred to as Sphenodontida).1

While they are often mistaken for lizards due to their appearance, they are the sole surviving members of this ancient lineage, which diverged from the order Squamata—the group that includes lizards and snakes—approximately 250 million years ago.1