Which of the following is not a body part of a spider?

In understanding the anatomy of spiders, it is crucial to recognize that they have two main body segments: the cephalothorax and the abdomen. The cephalothorax combines the head and thorax into a single structure, while the abdomen is a separate part that contains vital organs.

The thorax, as a distinct segment, is primarily a characteristic of insects and is not a separate body part in spiders. Insects typically have a three-part body plan: head, thorax, and abdomen. Therefore, the identification of the thorax as a separate body segment in the context of spider anatomy is incorrect.

In contrast, the cephalothorax and the abdomen are fundamental to spider morphology, serving critical functions such as housing the eyes, mouthparts, and various organs. Additionally, the chelicerae are specialized mouthparts found in spiders, used for grasping and tearing prey, further confirming their relevance to the species’ structure.