Cassidoeus or Cassideous: How To spell?

The word Cassidoeus is misspelled against Cassideous, an adjective meaning "Helmet-shaped; -- applied to a corolla having a broad, helmet-shaped upper petal, as in aconite."

Word contains consecutive vowels 'EO' in between alphabets cassid & us is misspelled as 'OE'
Wrong Spelling:  cassid-oe-us 
Correct Spelling:  cassid-eo-us 
Check more misspelled words of Cassideous to spell it correct.