The word Prostraca is misspelled against Proostraca, which is plural of "Proostracum"
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Proostraca has double "oo" is mispronounced as "o"
Remember double 'OO' in between the strings pr & straca which should not be misspelled with single 'O'
Wrong Spelling: pr-o-straca
Correct Spelling: pr-oo-straca
Find more incorrect spellings of Proostraca to spell right way.