Insect classification is based on a hierarchical system of grouping animals. Insects belong to the phylum Arthropoda, which is the largest of the animal phyla. They are divided into two subclasses: Apterygota (wingless) and Pterygota (winged or secondarily wingless). Pterygota are further classified by wing form into about 27 orders, such as Coleoptera (beetles), Diptera (flies), and Heteroptera (bugs).
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