genus Plesiosaurus

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Noun1.genus Plesiosaurus - a reptile genus of suborder Plesiosauria
reptile genus - a genus of reptiles
Plesiosauria, suborder Plesiosauria - any of the plesiosaurs
plesiosaur, plesiosaurus - extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous