NEET UG 2004 — Botany Animal Kingdom

In some members of the phylum Arthropoda, the fused head and thorax is called as cephalothorax. It is found in members myriapoda, Arachnida and in some Crustacea. Adult insect body is divided into three parts (head, thorax and abdomen), three pairs of legs and two pairs of wings. Related Theory $\begin{array}{|l|l|l|} \hline \text {Arthropod class } & \text {Examples } & \text {Characterstics } \\ \hline \text {Crustacea } & \text {Prawn, crab } & \text {Cephalothorax } \\ \hline \text {Chilopoda } & \text {Centepede } & \text {Head + trunk } \\ \hline \text {Diplopoda } & \text {Milipede } & \text {Head + thorax + abdomen } \\ \hline \text {Insecta } & \text {Honeybee, silkworm, Housefly } & \text {Head + thorax + abdomen } \\ \hline \text {Onychophora } & \text {Peripatus } & \text {Unsegmented body } \\ \hline \text {Merostoma } & \text {King crab (Limulus) } & \text {Cephalothorax } \\ \hline \text {Arachnida } & \text {Spider, Scorpion } & \text {Cephalothorax } \\ \hline \end{array}$Arthropod class Crustacea Chilopoda Diplopoda Insecta Onychophora Merostoma Arachnida ​Examples Prawn, crab Centepede Milipede Honeybee, silkworm, Housefly Peripatus King crab (Limulus) Spider, Scorpion ​Characterstics Cephalothorax Head + trunk Head + thorax + abdomen Head + thorax + abdomen Unsegmented body Cephalothorax Cephalothorax ​​