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Erotylidae (pleasing fungus beetles; subclass Pterygota, order Coleoptera) Family of shiny, oval beetles, 2–23 mm long, and often brightly coloured. The head is prognathous, with a three-segmented, flattened club. Larvae are pale and elongate, with toughened spiny plates. Legs are well developed, antennae three-segmented. The beetles are found in trees, where they feed on fungal material. There are 1500 species.