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head thorax arachnids abdomen

Arachnid, insectlike arthropod of the class Arachnida. Spiders, mites, and scorpions are arachnids. While an insect's body consists of head, thorax, and abdomen, an arachnid's body has only 2 main parts: abdomen and cephalothorax, which combines head and thorax. Also unlike insects, arachnids have no wings or antennae, and they have simple rather than compound eyes.

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