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Ptinidae (spider beetles; subclass Pterygota, order Coleoptera) Family of small beetles, 2–5 mm long, with a spider-like appearance; the thorax is narrow and rounded, covering the head, the abdomen is globular, the legs long. Some are smooth and shining, but others have elytra covered with dense pubescence. Larvae are white, curved and fleshy, with tiny legs. They feed on dried stored products, skins and carcasses. They are common pests in homes and warehouses. Their natural habitat is in nests of birds, mammals, and ants. There are 700 species.