Plesiosaur
Reptiles
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The Plesiosauria or plesiosaurs are an order or clade of extinct Mesozoic marine reptiles, belonging to the Sauropterygia.
Plesiosaurs first appeared in the latest Triassic Period, possibly in the Rhaetian stage, about 203 million years ago. Wikipedia
Scientific name: Plesiosauria
Class: Reptilia
Order: †Plesiosauria; Blainville, 1835
Clade: †Pistosauria
Kingdom: Animalia
Phylum: Chordata
Lower classifications
