The word Mesosavria is misspelled against Mesosauria, a noun meaning "Same as Mosasauria."
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Word contains consecutive vowels 'AU' in between alphabets mesos & ria is misspelled as 'AV'
Wrong Spelling:  mesos-av-ria 
Correct Spelling:  mesos-au-ria 
Find more incorrect spellings of Mesosauria to spell right way.