Penatulas or Pennatulas: How To spell?
The word Penatulas is misspelled against Pennatulas, which is plural of "Pennatula"
Pennatulas has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings pe & atulas which should not be misspelled with single 'N'
Wrong Spelling:  pe-n-atulas  Correct Spelling:  pe-nn-atulas 
Check more misspelled words of Pennatulas to spell it correct.