The word Plesiosarian 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 'A' as letter 'U' is phonetically ig
Wrong Spelling:  plesios-a-rian 
Correct Spelling:  plesios-au-rian 
Find more incorrect spellings of Plesiosaurian to spell right way.