Plyosaurus or Pleiosaurus: How To spell?

The word Plyosaurus is misspelled against Pleiosaurus, a noun meaning "Same as Pliosaurus."

Word contains consecutive vowels 'EI' in between alphabets pl & osaurus is misspelled as 'Y'
Wrong Spelling:  pl-y-osaurus 
Correct Spelling:  pl-ei-osaurus 
Check more misspelled words of Pleiosaurus to spell it correct.