Phylobranchia or Phyllobranchia: How To spell?
The word Phylobranchia is misspelled against Phyllobranchia, a noun meaning "A crustacean gill composed of lamellae."
Phyllobranchia has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings phy & obranchia which should not be misspelled with single 'L'
Wrong Spelling:  phy-l-obranchia  Correct Spelling:  phy-ll-obranchia 
Find more incorrect spellings of Phyllobranchia to spell right way.