Anthony Wootton, Ingenious Insects, Londres, J.M. Dent & Sons, 1983, p. 40.
Less conspicuous but no less admirable are the home made by the aquatic larvae of caddis-flies. These little tubes, which are just of a size to admit the larva’s body snugly but allow a predotor no access, are made of a variety of materials, according to species. Some are built from small fragments of stick; others quite beautifully of tiny pieces of stone or shell bonded together with the larva’s silk like tubes of mosaic work. Some of the most attractive are made tiny whole shells bonded together?