Mayfly nymph

Freshwater ecosystems such as streams, rivers, lakes, and ponds

Primarily detritivores or herbivores, feeding on algae, diatoms, and decaying organic matter

Aquatic larvae live underwater for months to years; they eventually emerge to molt into winged subimago and then adult stages for brief mating flights

Harmless to humans; serve as critical indicators of water quality and a primary food source for fish and birds