Small to large insects, the wings covered with minute hairs; wings with few cross-veins and, in repose, held in a sloping roof-like posture; anten nae long, thin and many-segmented; compound eyes small; ocelli present or absent; mouthparts often vestigial; maxillary palps long. Metamor phosis complete. Immature stages aquatic, the larvae usually inhabiting protective cases constructed from particles of sand or grit, pieces of vegetation or other debris; larvae campodeiform or eruciform; abdominal prolegs absent.
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