The word Ctenoidaun is misspelled against Ctenoidean, a noun meaning "One of the Ctenoidei."
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Ctenoidean has vowels 'ea' together mispronounced as 'au'
Word contains consecutive vowels 'EA' in between alphabets ctenoid & n is misspelled as 'AU'
Wrong Spelling:  ctenoid-au-n 
Correct Spelling:  ctenoid-ea-n 
Check more misspelled words of Ctenoidean to spell it correct.