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any wide and flat-bodied aquatic insect of the family Belostomatidae (order Heteroptera). This family, although containing only about 100 species, includes the largest bugs in the order: sometimes exceeding 10 cm (4 inches) in the South American species Lethocerus grandis and ranging between 2 and 5 cm in northern climates. These insects are usually seen suspended in a quiet pond or lake, the tip of their abdomen piercing the water surface and the brown, oval body hanging below.