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Stoneflies are aquatic insects found in cold, well-oxygenated streams and rivers where their presence signals excellent water quality; adults have two pairs of membranous wings and long antennae, while nymphs are elongated, flattened, and equipped with gills along the thorax and two tail filaments, living on the streambed for one to three years as predators or detritivores before emerging to mate and lay eggs on the water surface.
Stoneflies are aquatic insects found in cold, well-oxygenated streams and rivers where their presence signals excellent water quality; adults have two pairs of membranous wings and long antennae, while nymphs are elongated, flattened, and equipped with gills along the thorax and two tail filaments, living on the streambed for one to three years as predators or detritivores before emerging to mate and lay eggs on the water surface.