Assertion: plesiosaur | /r/HasProperty | represented by elasmosaurus
Facets:
Source sentences:
text: There were three main groups of the plesiosaurs: the pliosaurs, represented by Liopleurodon and Plesiopleurodon (which appeared in a cameo in the 4th episode of Walking with Dinosaurs), the pistosaurids, and the plesiosaurs proper, represented by Cryptoclidus and Elasmosaurus from the last episode of Sea Monsters.