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Ptiliidae (subclass Pterygota, order Coleoptera) Family of minute beetles, less than 2 mm long, which includes the smallest known beetle, Nanosella fungi, 0.25 mm. Usually they are convex and very shiny, but some have a conspicuous pubescence. The wings are narrow, with much reduced venation and a fringe of long hairs. The antennae are hairy, with loose clubs. They are found in fungi, decaying vegetation, and under bark. Ptilium myrmecophilum lives in ant nests. There are 300 species.