Abstract
Sensilla on the antennal flagellum are studied in 6 species of the genus Molanna (M. nigra, M. submarginalis, M. uniophila, M. moesta, M. angustata, and M. albicans) and one species of Molannodes: M. tinctus (Molannidae). Ventrolateral surfaces of basal flagellomeres in molannids are provided with peculiar sensory fields devoid of long trichoids. These fields differ from species to species and have species-dependent morphological features. There are 5 types of sensilla found on the flagellum: Long serrated and ridge-bearing trichoids, short curved smooth trichoids, mushroom-like pseudoplacoids, basiconic and coronal. Functional asymmetry of pheromone communication occurs in Molanna where the volatiles produced only by females coincide with sex-dependent dimorphism of antennae. The structures of the sensory fields and sensilla, especially the pseudoplacoids, are species-specific and can be used for the species discrimination and studies of species relationships. Comparative analysis shows the importance of the characters of both the antennal morphology and the sensilla distribution for taxonomic studies and reconstructions of phylogeny.
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