An insect, a beetle, and a terrestrial arthropod are related but distinct categories within the animal kingdom. Here's the difference between them:

1. Insect: Insects are a class of invertebrates within the phylum Arthropoda. They are characterized by having three main body parts (head, thorax, and abdomen), six legs, and usually one or two pairs of wings. Examples of insects include ants, bees, butterflies, and mosquitoes.

2. Beetle: Beetles are a specific group of insects belonging to the order Coleoptera. They are the largest order of insects, representing about 40% of all known insect species. Beetles are characterized by having hardened forewings called elytra, which protect the delicate hindwings and the body. Examples of beetles include ladybugs, fireflies, and weevils.

3. Terrestrial arthropod: Terrestrial arthropods are a broader category that includes all land-dwelling arthropods. Arthropods are a phylum of invertebrate animals characterized by having an exoskeleton, a segmented body, and jointed appendages. Terrestrial arthropods encompass insects, spiders, scorpions, millipedes, centipedes, and other land-dwelling arthropod species.
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