Aculyi or Aculei: How To spell?

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

Word ends with consecutive vowels 'EI' preceded by alphabets 'acul' is misspelled as 'YI'
Wrong Spelling:  acul-yi 
Correct Spelling:  acul-ei 
Check more misspelled words of Aculei to spell it correct.