A photograph of an adult Stonefly. Photograph by Haplochromis licensed under Creative Commons. This is a small group of aquatic insects, often referred to as Stoneflies. Adult stoneflies emerge during the winter and spring; some species as early as February. Many species fly at night and are attracted to lights.
Adult stoneflies have long antennae, weak, chewing mouthparts, and two pairs of membranous wings. The hindwings are generally larger and shorter than the forewings and fold like a fan when not in use. They range in size from 6 to more than 60 mm ( to inches). Feeding. The nymph feeds on plants, decaying organic matter, and other insects. Adult stoneflies have two pairs of wings that are clear, membranous and finely veined. The wings rest closely down the back of the body, the forewings covering the .
Adult stone flies range from 6 to 50 mm ( to inches) long. They are dull-colored, commonly gray, brown, green, or yellowish. Adult stoneflies have two pair of membranous wings that fold over the back when at rest. The wings have many veins, and the hind wing is broad at the base and fanlike. Stonefly Adults The stonefly hatch is as exciting for fishermen as it is for fish. Beginning in March, these bugs are high floating, highly visible meals for trout and .
Adult stoneflies are herbivorous and usually feed on algae, lichens, rotting wood or other detritus. The larvae are mostly herbivorous also and feed on a wide variety of small plants, algae or dead plant matter, although some species are carnivorous. May 25, · Adult stoneflies have 2 pairs of wings that are held flat over their bodies when they are not flying. The front pair of wings is usually a little longer than the back pair. Stoneflies also have 2 "tails" (cerci) on the tips of their abdomens. Young stoneflies .