challenge: What is a distinctive feature of the head of Bdellozonium cerviculatum?
  
  A. The absence of ocelli on each side of the head
  B. The antennae are about one and a half times shorter than the width of the first body segment
  C. The antennae are about one and a half times longer than the width of the first body segment
  D. The presence of a long, thin clypeus
  Answer: 