Colin Willock, The Angler’s Encyclopaedia, Londres, Odham Press Limited, 1961, p. 38.
The peculiarity of the caddis is that the larva builds itself a protective case of sticks, small shells, or pieces of stone. These cases can often be spotted on stony shallows.
A first-class in its larval stage for the coarse fisherman. The larva builds itself a remarkable protective casing (right) for concealment.