
1) Archosaur 2) Archosaurian 3) Archosaurian reptile 4) Plesiosaur
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https://www.crosswordclues.com/clue/plesiosaurus

1) Plesiosaur
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https://www.crosswordclues.com/clue/plesiosaurus

• (n.) A genus of large extinct marine reptiles, having a very long neck, a small head, and paddles for swimming. It lived in the Mesozoic age.
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http://thinkexist.com/dictionary/meaning/plesiosaurus/

(from the article `plesiosaur`) Plesiosaurus, an early plesiosaur, was about 4.5 metres (15 feet) long, with a broad, flat body and a relatively short tail. It swam by flapping its ...
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http://www.britannica.com/eb/a-z/p/80

(pronounced plee-zee-oh-SAWR-us) Plesiosaurus was a genus of flippered marine reptiles from the early Jurassic period . It was roughly 7.6 feet (2.3 m) long with 4 wide, paddle-shaped flippers, and a tapered body. Plesiosaurus lived in what is now England and Germany. It as not a dinosaur, but a plesiosaur , a marine reptile that lives during the t...
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
Ple`si·o·sau'rus noun ;
plural Plesiosauri . [ New Latin , from Gr ... near + ... a lizard.]
(Paleon.) A genus of large extinct marine reptiles, having a very long neck, a small head, and paddles for swimming. It lived in the Mesozoic age.
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http://www.encyclo.co.uk/webster/P/107

Plesiosaurus was a genus of long-necked Plesiosaur. Plesiosaurus was a marine reptile (very similar to a dinosaur, and libing at the same time but in the sea) that lived during the Mesozoic Period. It had a long neck, short tail, small head and four paddle-like limbs. Remains of a Plesiosaurus have been found in a quarry at Harbury in Warwickshire,...
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http://www.probertencyclopaedia.com/browse/BPA.HTM

Plesiosaurus A near (approximate to the Saurians) from Early Jurassic Europe (England and Germany). It was not a dinosaur. Named by De la Beche and William Daniel Conybeare in 1821.
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http://www.wordinfo.info/words/index/info/view_unit/1697/
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