Crinoidan or Crinoidean: How To spell?

The word Crinoidan is misspelled against Crinoidean, a noun meaning "One of the Crinoidea."

Crinoidean has vowels 'ea' together mispronounced as 'a'
Word contains consecutive vowels 'EA' in between alphabets crinoid & n is misspelled as 'A'
Wrong Spelling:  crinoid-a-n 
Correct Spelling:  crinoid-ea-n 
Find more incorrect spellings of Crinoidean to spell right way.

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