Plesiosauria

Plesiosaurs first appeared in the latest Triassic Period, possibly in the Rhaetian stage, about 205 million years ago. They became especially common during the Jurassic Period, thriving until their disappearance due to the Cretaceous–Paleogene extinction event at the end of the Cretaceous Period, about 66 million years ago. They had a worldwide ...
Found on http://en.wikipedia.org/wiki/Plesiosauria

Plesiosauria

• (n. pl.) An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also Sauropterygia.
Found on http://thinkexist.com/dictionary/meaning/plesiosauria/

Plesiosauria

suborder Plesiosauria noun any of the plesiosaurs
Found on https://www.encyclo.co.uk/local/20974

Plesiosauria

Ple`si·o·sau'ri·a noun plural [ New Latin See Plesiosaurus .] (Paleon.) An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also Sauropterygia .
Found on http://www.encyclo.co.uk/webster/P/107

Plesiosauria

[n] - any of the plesiosaurs
Found on http://www.webdictionary.co.uk/definition.php?query=Plesiosauria
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