—A comparative morphological study of the structure and localization of antennal sensilla in scorpionfl ies
(Mecoptera) was carried out. Scanning electron microscopy was used to study the morphology of antennal sensilla in
four species from the families Panorpidae, Bittacidae, Nannochoristidae, and Boreidae. According to our new fi ndings
and the literature data, seven types of sensilla are present on the antennae of Mecoptera: long trichoid, short trichoid,
chaetoid, campaniform, basiconic, coeloconic sensilla, and Böhm’s bristles. The antennal sensory apparatus in the
studied species is represented mostly by long trichoid and basiconic sensilla. Specialization is manifested only by
a few coeloconic sensilla, which show specifi c distribution on the segment surface. The basiconic sensilla are more
common at the anterior segment margins, and they form clusters in one species of Boreidae. Comparison with the
related orders shows reduced diversity of sensilla in scorpionfl ies.