Palp segments of basal Trichoptera and their features. A. First and second segments of a maxillary palp of Rhyacophila munda male; B. First and second segments of a maxillary palp of Dolophilodes ornata female; C. Fifth segment of a maxillary palp of Rhyacophila nubila male; D. The same, sensory field of petaloid sensilla; E. Third segment of labial palp of Dolophilodes ornata female; F. The same, sensory field of petaloid sensilla. Abbreviations: chs-l = long blunt chaetoid sensilla; chs-s = short blunt chaetoid sensilla; lts = pointed long trichoid sensilla; mps = mushroom-like pseudoplacoid sensilla; pes = petaloid sensilla; sf = sensory field; tbs = thick basiconic sensilla.