Stoneflies are aquatic insects belonging to the order Plecoptera. They are typically found in clean, cold streams and rivers, where they play a crucial role in the ecosystem as indicators of water quality. Stoneflies have a distinct life cycle, which includes an egg, nymph, and adult stage, with nymphs living underwater for several months to years before emerging as adults. These insects are characterized by their two pairs of membranous wings and long, slender bodies. Stoneflies primarily feed on decaying plant material and algae, contributing to the nutrient cycle in their habitats. Their presence is often used by ecologists to assess the health of freshwater ecosystems, making them important for conservation efforts.