Mastodonsawrus or Mastodonsaurus: How To spell?
The word Mastodonsawrus is misspelled against Mastodonsaurus, a noun meaning "A large extinct genus of labyrinthodonts, found in the European Triassic rocks."
Word contains consecutive vowels 'AU' in between alphabets mastodons & rus is misspelled as 'AW'Wrong Spelling:  mastodons-aw-rus  Correct Spelling:  mastodons-au-rus 
Check more misspelled words of Mastodonsaurus to spell it correct.