Case-Building in Trichoptera as an Inherited Response to Oxygen Deficiency

Many papers have been written about caddis cases, treating these movable shelters from the standpoints of choice of materials (Brues 1930, Dodds & Hisaw 1926, Lloyd 1915, Lutz 1930, Simpson 1903), of repair (Marshall & Vorhies 1905), of ontogenetic initiation (Murphy 1919, Copeland & Crowell 1937), and of phylogenetic origin (Milne & Milne, 1938). The last of these references, a paper by Sleight (1913) and the work of Dodds & Hisaw cited above, give some attention to the relation between case-building and the physiology of the larva inhabiting the structure, but much remains to be studied in this connection.