William S. Dallas, The Natural History of the animal Kingdom, Londres, W.S. Orr, 1856, p. 185.
To protect their soft bodies, which constitue a very favorite food with fishes, these larvae always inclose themselves in cases formed of various materials, bits of strawand sticks, pebbles and even small shells, being commonly employed in the manner. The materials of these curious cases are united by means of fine silken threads, spun like those of the Caterpillars of the Lepidaptera, from a spinneret situated on the labium. Im increasing the size of its case to suit its growth, the larva is said to add only to the anterior end, cutting off a portion of the opposite extremity.