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Hydrochidae (subclass Pterygota, order Coleoptera) Family of small, black or bronze beetles about 3 mm long, which are generally found on water plants. The maxillary palps are long. The antennae have three-segmented clubs. Formerly the family was included in the Hydraenidae, but there are essential structural differences. Little is known of the larvae. There are 69 species.

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