challenge: Which of the following characteristics is not typical of Rogadius flatheads?
  
  A. Between 48 and 56 pored scales on the lateral line
  B. Elongation of the upper lobe of the caudal fin
  C. At least 2 spines on the preoperculum
  D. Between 8 or 9 spines in the first dorsal fin
  Answer: 