Perenibranchiata or Perennibranchiata: How To spell?
The word Perenibranchiata is misspelled against Perennibranchiata, a noun meaning "Those Batrachia which retain their gills through life, as the menobranchus."
Perennibranchiata has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings pere & ibranchiata which should not be misspelled with single 'N'
Wrong Spelling:  pere-n-ibranchiata  Correct Spelling:  pere-nn-ibranchiata 
Find more wrongly spelled words of Perennibranchiata to spell it well.