Question

The cephalothorax is a fusion of
a. the head and tail region
b. the abdomen and thorax region
c. the head and thorax region
d. none of these, it is not fused

Answer 1

The answer is c. the head and thorax region.

The word cephalothorax is derived from two Greek words - cephalon, meaning head, and thorax. So, it is a fusion of these two body parts, and it is characteristic for chelicerates (scorpions, spiders,...) and crustaceans (crabs, lobsters, shrimps,...) . Cephalothorax is unsegmented and rigid and it is easy to differ it from the abdomen.