In North America, the Order Trichoptera includes approximately 12,000 species of caddisflies. Many species may be found in the eastern U.S. and therefore might be called eastern caddisflies.
Eastern caddisflies typically appear during late summer or early fall. They inhabit and lay their eggs in bodies of freshwater. Larvae spend most of their lives underwater, feeding on detritus. Like almost all caddisflies, scientists classify the eastern caddisfly by virtue of its larvae and behavior: the eastern caddisfly often are a case-making type. Eastern caddisfly larvae carry their cases wherever they go and use them for protection.
Adult eastern caddisflies measure approximately 1.5 to 40 mm in length and live on dry land. When they are ready to breed, eastern caddisflies lay their eggs in strands upon the surface of a body of water. The eggs then sink to the bottom and hatch into larvae within a few weeks.