In Arthropoda, head and thorax are often use to form cephalothorax, but in which one of the following…

In Arthropoda, head and thorax are often use to form cephalothorax, but in which one of the following classes, is the body divided into head thorax and abdomen?
  1. insecta
  2. myriapoda
  3. crustacea
  4. arachnida and curstacea.

Solution

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 \(\begin{array}{|l|l|l|}
\hline \text {Arthropod class } & \text {Examples } & \text {Characterstics } \\
\hline \text {Crustacea } & \text {Prawn, crab } & \text {Cephalothorax } \\
\hline \text {Chilopoda } & \text {Centepede } & \text {Head + trunk } \\
\hline \text {Diplopoda } & \text {Milipede } & \text {Head + thorax + abdomen } \\
\hline \text {Insecta } & \text {Honeybee, silkworm, Housefly } & \text {Head + thorax + abdomen } \\
\hline \text {Onychophora } & \text {Peripatus } & \text {Unsegmented body } \\
\hline \text {Merostoma } & \text {King crab (Limulus) } & \text {Cephalothorax } \\
\hline \text {Arachnida } & \text {Spider, Scorpion } & \text {Cephalothorax } \\
\hline
\end{array}\)

Asked in: NEET 2004

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