Acanthopterygi or Acanthopterygii: How To spell?
The word Acanthopterygi is misspelled against Acanthopterygii, a noun meaning "An order of fishes having some of the rays of the dorsal, ventral, and anal fins unarticulated and spinelike, as the perch."
Acanthopterygii has double 'ii' in the end mispronounced as 'i'Remember double 'II' appears in the end of this word which should not be misspelled with single 'I'
Wrong Spelling:  acanthopteryg-i  Correct Spelling:  acanthopteryg-ii 
Find more incorrect spellings of Acanthopterygii to spell right way.