What are the two body regions of a spider?

The correct choice indicates that spiders have two primary body regions: the cephalothorax and the abdomen. The cephalothorax, sometimes referred to as the prosoma, is a composite section that merges the head and thorax, housing essential features such as the eyes, mouthparts, and legs. The abdomen, or opisthosoma, is a distinct posterior section that contains vital organs related to digestion, reproduction, and spinnerets for silk production.

This division into these two regions is a characteristic feature of arachnids, which also includes scorpions, ticks, and mites, setting them apart from insects that have three distinct body segments: head, thorax, and abdomen. Understanding this anatomical classification is crucial for anyone studying spider biology or pest control, as it informs identification and biological assessment in various contexts, including pest management and ecological studies.