Comparative chart of arthropod groups showing features like exoskeletons, body segments, and locomotion.

- Insects have three body segments (head, thorax, abdomen), two antennae, and six legs; they possess an exoskeleton.
- Arachnids have a cephalothorax (fused head and thorax) and abdomen, eight legs, and no antennae; they are terrestrial predators that control insect populations.
- Myriapods have a head, segmented body, antennae, jaws, and many jointed legs; they are terrestrial herbivores with cylindrical bodies.
- Crustaceans have bodies covered by a chitin shell, with head and abdomen segments each bearing a pair of legs; they are aquatic invertebrates, and many like lobsters and crabs have pincers.