Distribution of palp sensory surface characters within Trichoptera. A. Presence (blue) or absence (red) of a group of long chaetoid sensilla on the first and second segments of maxillary palps; B. Degree of development of mushroom-like pseudoplacoid sensilla on the palps: on all labial and maxillary palp segments (blue), on distal segments of labial and maxillary palps (purple), or total reduction of pseudoplacoid sensilla (red). The phylogenetic tree is based on the data from Holzenthal et al. 2007a.