Polypteroidea or Polypteroidei: How To spell?

The word Polypteroidea 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 ends with consecutive vowels 'EI' preceded by alphabets 'polypteroid' is misspelled as 'EA'
Wrong Spelling:  polypteroid-ea 
Correct Spelling:  polypteroid-ei 
Find more incorrect spellings of Polypteroidei to spell right way.