Archianelida or Archiannelida: How To spell?
The word Archianelida is misspelled against Archiannelida, a noun meaning "A group of Annelida remarkable for having no external segments or distinct ventral nerve ganglions."
Archiannelida has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings archia & elida which should not be misspelled with single 'N'
Wrong Spelling:  archia-n-elida  Correct Spelling:  archia-nn-elida 
Find more wrongly spelled words of Archiannelida to spell it well.