Polyydic or Polyeidic: How To spell?

The word Polyydic is misspelled against Polyeidic, an adjective meaning "Passing through several distinct larval forms; -- having several distinct kinds of young."

Word contains consecutive vowels 'EI' in between alphabets poly & dic is misspelled as 'Y'
Wrong Spelling:  poly-y-dic 
Correct Spelling:  poly-ei-dic 
Find more incorrect spellings of Polyeidic to spell right way.