Hypothetical ground plan of sensory surface of labial and maxillary palps in Trichoptera. A. Types of sensilla; B. Labial palps; C. Maxillary palps. Abbreviations: roman numerals = segment numbers; cfs = campaniform sensilla; chs = blunt chaetoid sensilla; D = dorsal surface; L = lateral surface; lts = pointed long trichoid sensilla; M = medial surface; mps = mushroom-like pseudoplacoid sensilla; pes = petaloid sensilla; tbs = thick basiconic sensilla; V = ventral surface.