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to cover the last common ancestor of archosaurs and lepidosaurs was the result of papers by Jacques Gauthier and colleagues in the 1980s.

Genomic studies and comprehensive studies in the fossil record suggest that turtles are closely related to archosaurs as part of Sauria, and not to the non-saurian parareptiles as previously thought.

Synapomorphies

The synapomorphies or characters that unite the clade Sauria

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