Chambers’s Encyclopedia

AnonymeChambers‘s Encyclopedia, vol. II, Londres, Geore Newnes Limited, 1955, p. 755.

In many species the larva make shelters or caddis cases wherein they live and carry with them as they move about. These habitations are formed silk to which pieces of leaves stems, sticks or straws are closely attached: other species use sand, small pebbles or empty snail shells.