challenge: Which of the following characteristics distinguishes Kongqiaoheia rotundata from Taklamakania?
  
  A. Disk-shaped body with a semi-circular cephalon
  B. Bulbous structures on the pygidium
  C. Presence of a spine on the anterior of the glabellum
  D. Long, thin, librigenial spines from the lateral corners of the cephalon
  Answer: 