Polypteroidi or Polypteroidei: How To spell?

The word Polypteroidi is misspelled against Polypteroidei, a noun meaning "A suborder of existing ganoid fishes having numerous fins along the back. The bichir, or Polypterus, is the type. See Illust. under Crossopterygian."

Word end with consecutive vowels 'EI' preceded by alphabets 'polypteroid' is misspelled as 'I' as letter 'E' is phonetically ign
Wrong Spelling:  polypteroid-i 
Correct Spelling:  polypteroid-ei 
Find more incorrect spellings of Polypteroidei to spell right way.