In Arthropoda, 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?

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Insecta. Insects characteristically have the body divided into three distinct regions: head, thorax, and abdomen. Other arthropod groups often show different tagmata, such as cephalothorax and abdomen in arachnids and many crustaceans.

In Arthropoda, 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?

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