Henry Williamson, Nature in Britain, article Pond and Stream Life de E.G. Boulenger, Londres, Batsford, 1936, p. 125.
Best-know of all aquatic fly larvae are the « caddis » worms, so favoured as bait by bottom fishermen. These fly larvae build cylindrical tubes of stick, shells, gravel, etc., in which to secrete their unprotected bodies; the shelland grit-using specis being satisfied in an aquarium to use glass beads for their home-making if no other material is at hand. Thus highly decorative results mey be obtained.