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Tetrigidae (groundhoppers, grouse locusts, pygmy locusts; order Orthoptera, suborder Caelifera) Family of small, dull-coloured grasshoppers whose major characteristic is an elongated pronotum, which may cover the wings (if wings are present), and extend beyond the tip of the abdomen. Tetrigids are usually found on the ground in moist areas, and feed on algae or organically rich mud. Many species swim readily. There are about 1000 species, most of which are tropical, although 50 species are Palaearctic.

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