Acule or Aculei: How To spell?

The word Acule is misspelled against Aculei, which is plural of "Aculeus"

Word end with consecutive vowels 'EI' preceded by alphabets 'acul' is misspelled as 'E' as letter 'I' is phonetically ignored
Wrong Spelling:  acul-e 
Correct Spelling:  acul-ei 
Check more misspelled words of Aculei to spell it correct.