Pachypleurosaurus is a genus of pachypleurosaurian that lived during the Triassic Period. It was a basal sauropterygian, and had a long neck. The type species is P. edwardsi.
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Jurassic Park
Pachypleurosaurus has never appeared or been mentioned in any Jurassic Park films or books, it has however appeared in Jurassic Park III: Park Builder.