Houstella or Haustella: How To spell?

The word Houstella is misspelled against Haustella, which is plural of "Haustellum"

Word contains consecutive vowels 'AU' in between alphabets h & stella is misspelled as 'OU'
Wrong Spelling:  h-ou-stella 
Correct Spelling:  h-au-stella 
Check more misspelled words of Haustella to spell it correct.

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