Assertion: plesiosaur | /r/HasProperty | plesiosaurus
Facets:
value: in 1821
type: TEMPORAL
Source sentences:
text: The first plesiosaur to be named and described was Plesiosaurus back in 1821.
text: Fish would be frightened by their big bodies, but the elasmosaurs could, like the more ancient plesiosaurs Plesiosaurus and Cryptoclidus, sneak their heads right into the middle a shoal, and then strike.