The word Plesiosuarian is misspelled against Plesiosaurian, a noun meaning "A plesiosaur."
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Word contains consecutive vowels 'AU' in between alphabets plesios & rian is misspelled as 'UA'
Wrong Spelling:  plesios-ua-rian 
Correct Spelling:  plesios-au-rian 
Check more misspelled words of Plesiosaurian to spell it correct.