The word Ichthyosuri is misspelled against Ichthyosauri, which is plural of "Ichthyosaurus"
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Word contains consecutive vowels 'AU' in between alphabets ichthyos & ri is misspelled as 'U' as letter 'A' is phonetically ign
Wrong Spelling:  ichthyos-u-ri 
Correct Spelling:  ichthyos-au-ri 
Check more misspelled words of Ichthyosauri to spell it correct.