Question

In Arthopoda, head and thorax are often fused to form cephalothorax, but in which one of the following classes, is the body divided into head, thorax and abdomen ?

• A. Myriapoda
• B. Crustacea
• C. Arachnida and Crustacea
• D. Insecta

Answer 1

Answer: (D)

Insecta

Answer 2

Arthropods commonly exhibit a body structure comprising three segments: the head, thorax, and abdomen. However, in certain instances, the head and thorax may fuse together to create a cephalothorax, as observed in crustaceans like prawns, lobsters, and crabs. The class Insecta, which encompasses insects, largely follows the pattern of having a body divided into distinct head, thorax, and abdomen regions. For instance, cockroaches represent a typical example of this structure. Meanwhile, the Myriapoda group within arthropods includes creatures such as millipedes and centipedes. Additionally, the class Arachnida consists of arthropods like spiders.