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Temporal range: Early Triassic – Late Cretaceous
Thalassomedon hanningtoni
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
clade: Pantestudines
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.

Origins and evolution

Size and ecology

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