The word Stylomata is misspelled against Stylommata, a noun meaning "Same as Stylommatophora."
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Stylommata has double "mm" is mispronounced as "m"
Remember double 'MM' in between the strings stylo & ata which should not be misspelled with single 'M'
Wrong Spelling:  stylo-m-ata 
Correct Spelling:  stylo-mm-ata 
Find more incorrect spellings of Stylommata to spell right way.