Assertion: plesiosaur | /r/HasProperty | a type of marine reptile
Facets:
Source sentences:
text: Plesiosaurus was a plesiosaur, a type of marine reptile.
text: Elasmosaurus was a plesiosaur, a type of marine reptile.
text: Dolichorhynchops was a plesiosaur, a type of marine reptile.
text: Styxosaurus was a plesiosaur, a type of marine reptile.