What is a distinguishing feature of mites, ticks, and spiders compared to insects?

Mites, ticks, and spiders are classified as arachnids, while insects belong to a different class altogether. One of the distinguishing features between these two groups is the number of body segments. Arachnids typically have two main body regions: the cephalothorax (which combines the head and thorax) and the abdomen. In contrast, insects generally have three distinct body regions: the head, thorax, and abdomen. This difference in body structure is essential for identifying and categorizing these organisms in the animal kingdom, and it plays a significant role in their classification within the broader taxonomic hierarchy.