The Plecoptera are an order of insects, commonly known as ilprofeta.info 3, species are described worldwide, with new species still being discovered. Stoneflies are found worldwide, except Antarctica. Stoneflies are believed to be one of the most primitive groups of Neoptera, with close relatives identified from the Carboniferous and Lower Permian geological periods, while true stoneflies Class: Insecta. Depending on the species, stoneflies may live for 1 or 2 years underwater in the immature, larval form. When growth is complete, usually in the summer, the nymph crawls out of the water (often onto stones, hence the name), molts, and emerges as a winged adult.
Stonefly Adults While Stoneflies (Plecoptera) can be found in many rivers in the U.S., they are most abundant in Western rivers. These are generally large bugs and fish like big meals! 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.
Adult stoneflies are generally found on the banks of streams and rivers from which they have emerged. They are not active fliers and usually remain near the ground where they feed on algae or lichens. In many species, the adults are short-lived and do not have functional mouthparts. Stoneflies are most abundant in cool, temperate climates. Stoneflies are a major diet component of trout around the world. Steelhead eat them under the right conditions too.. Like Caddis Flies, micro- to macro-size Stoneflies are incredibly diverse in size, color and behavior. Stoneflies are widely distributed wherever the rivers support trout reproduction, so they are a standard in the fly boxes of.