Penatula or Pennatula: How To spell?
The word Penatula is misspelled against Pennatula, a noun meaning "Any one of numerous species of Pennatula, Pteroides, and allied genera of Alcyonaria, having a featherlike form; a sea-pen. The zooids are situated along one edge of the side branches."
Pennatula has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings pe & atula which should not be misspelled with single 'N'
Wrong Spelling:  pe-n-atula  Correct Spelling:  pe-nn-atula 
Check more misspelled words of Pennatula to spell it correct.