Fisirostral or Fissirostral: How To spell?
The word Fisirostral is misspelled against Fissirostral, an adjective meaning "Having the bill cleft beyond the horny part, as in the case of swallows and goatsuckers."
Fissirostral has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings fi & irostral which should not be misspelled with single 'S'
Wrong Spelling:  fi-s-irostral  Correct Spelling:  fi-ss-irostral 
Find more incorrect spellings of Fissirostral to spell right way.