Diversity and distribution patterns of antennal sensilla in Hydropsychidae (Insecta, Trichoptera)

Structure and distribution of antennal sensilla were studied in males 19 species the caddisfly family Hydropsychidae by using scanning electron microscopy (SEM). Eleven types found: long trichoid, chaetoid, thick curved coronary, basiconic, styloconic four pseudoplacoid (mushroom-like, auricillic, ribbed, T-shaped). Thick ribbed pseudoplacoid, T-shaped found only Macronematinae. The great diversity originated from a mushroom-like type, which also has variable structure. Basal flagellomeres majority are equipped with ventrally positioned sensory fields trichoid sensilla. In contrast to Arctopsychinae Hydropsychinae, increased number these was noted for Diplectroninae Smicrideinae. Most Macronematinae show reduction strongly decreased average on distal segments. differences probably indicate rapid function-related evolution surface structures Hydropsychidae.