What is the meaning of Plesiosauria?

(n.pl.) An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also Sauropterygia.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). plesiosauria. Retrieved September 23, 2026, from http://smartdefine.org/plesiosauria/definitions/2046455
ChicagoWebster's. 2011. "plesiosauria" http://smartdefine.org/plesiosauria/definitions/2046455 (accessed September 23, 2026).
HarvardWebster's 2011, plesiosauria, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/plesiosauria/definitions/2046455>.
MLAWebster's. "plesiosauria" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/plesiosauria/definitions/2046455>
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