Selachoidau or Selachoidei: How To spell?

The word Selachoidau is misspelled against Selachoidei, a noun meaning "Same as Selachii."

Word ends with consecutive vowels 'EI' preceded by alphabets 'selachoid' is misspelled as 'AU'
Wrong Spelling:  selachoid-au 
Correct Spelling:  selachoid-ei 
Check more misspelled words of Selachoidei to spell it correct.