Thalattosaurus is a Sauropsid Thalattosaurid from late Triassic South America.  The Thalattosaurs are characterized by webbed feet. paddle-like tails, and living during the mid to late Triassic.  These reptiles gave rise to the placodonts, nothosaurs, and plesiosaurs.  This family includes Askeptosaurus, Endennasaurus, MiodentosaurusNectosaurus, and Xinpusaurus.

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