Cystoidan or Cystoidean: How To spell?
The word Cystoidan is misspelled against Cystoidean, a noun meaning "Same as Cystidean."
Cystoidean has vowels 'ea' together mispronounced as 'a'Word contains consecutive vowels 'EA' in between alphabets cystoid & n is misspelled as 'A'
Wrong Spelling:  cystoid-a-n  Correct Spelling:  cystoid-ea-n 
Find more incorrect spellings of Cystoidean to spell right way.