H. Crabtree, Fresh-water Wonders and how to identify them, Londres, The Epworth Press, circa 1920, p. 52.

The Caddis-fly larva is seen in almost every pool of still water. Its curious tubes, made of sand, clay, shells, mosses or small sticks, are found scattered over the bottom of the pool; and the larva itself will be noticed creeping out of its tube among the weeds in search of food.