A comparative SEM study of palp sensory surfaces in 25 caddisfly species representing seven families reveals types sensilla: long trichoid, blunt chaetoid, campaniform, mushroom-like pseudoplacoid, petaloid, thick basiconic and thin sensilla. Long trichoid chaetoid sensilla are present on all segments both pairs palps. First second maxillary palps bear groups sclerotised their medial surface. O...