Blennid or Blenniid: How To spell?
The word Blennid is misspelled against Blenniid, an adjective meaning "pertaining to, resembling, the blennies."
Blenniid has double "ii" is mispronounced as "i"Remember double 'II' in between the strings blenn & d which should not be misspelled with single 'I'
Wrong Spelling:  blenn-i-d  Correct Spelling:  blenn-ii-d 
Find more wrongly spelled words of Blenniid to spell it well.