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Temporal range: Early Triassic – Late Cretaceous
Thalassiodracon BW.jpg
Thalassomedon hanningtoni
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: Sauropterygia
Owen, 1860

Sauropterygia is a superorder of diapsid reptiles that existed from the early Triassic to the late Cretaceous.  This is the order of Nothosaurs, Placodonts, and Plesiosaurs.

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