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phylum Chordata Plesiosaurus was a genus of large marine sauropterygian reptile that lived during the early part of the Jurassic Period, and is known by nearly complete skeletons from the Lias of England. Although there are a number of modern day myths surrounding this order of creature, such as the myth of the Loch Ness monster, these creatures are known to be extinct. It is distinguishable by its small head, long and slender neck, broad turtle-like body, a short tail, and two pairs of large, elongated paddles.

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clade Diapsida
superorder Sauropterygia
order Plesiosauria
family Plesiosauridae
genus Plesiosaurus
species P. dolichodeirus
Temporal range 199.6–175.6Ma

Plesiosaurus Skeleton

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