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Byrrhidae (pill beetles; class Insecta, order Coleoptera) Family of dull, pubescent, highly convex beetles, 1.5–10 mm long. The antennae are clubbed. When disturbed, the legs are withdrawn completely into grooves on the under-side of the abdomen. Larvae are fat and cylindrical, with a large, broad prothorax, and a pair of retractable false legs on the terminal segment. Larvae are found among roots and in moss. There are 270 species.