Assertion: plesiosaur | /r/PartOf | the sauropterygia
Facets:
Source sentences:
text: The Plesiosauria ( ; Greek: πλησίος, plesios, meaning "near to" and sauros, meaning "lizard") or plesiosaurs are an order or clade of extinct Mesozoic marine reptiles (marine Sauropsida), belonging to the Sauropterygia.