Pelagosaurus was a known predator of Leptolepis after a Pelagosaurus fossil was found with Leptolepis remains in its stomach.
Pelagosaurus was originally described from a specimen from Normandy, but the holotype for P. typus was discovered north of the town of Ilminster in Somerset, England.
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# Teleosaurid: The teleosaurid classification of Pelagosaurus, based upon anatomical similarity, was maintained by Eudes-Deslongchamps, Westphal and Duffin.