Plesiosaarian or Plesiosaurian: How To spell?

The word Plesiosaarian is misspelled against Plesiosaurian, a noun meaning "A plesiosaur."

Word contains consecutive vowels 'AU' in between alphabets plesios & rian is misspelled as 'AA'
Wrong Spelling:  plesios-aa-rian 
Correct Spelling:  plesios-au-rian 
Find more incorrect spellings of Plesiosaurian to spell right way.

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