Ganoideu or Ganoidei: How To spell?

The word Ganoideu is misspelled against Ganoidei, a noun meaning "One of the subclasses of fishes. They have an arterial cone and bulb, spiral intestinal valve, and the optic nerves united by a chiasma. Many of the species are covered with bony plates, or with ganoid scales; others have cycloid scales."

Word ends with consecutive vowels 'EI' preceded by alphabets 'ganoid' is misspelled as 'EU'
Wrong Spelling:  ganoid-eu 
Correct Spelling:  ganoid-ei 
Check more misspelled words of Ganoidei to spell it correct.