Antennal sensilla of triatominae (Hemiptera, Reduviidae): A comparative study of five genera

The paper analyses the antennal sensilla pattern of 22 species of triatomine bugs (Hemiptera, Reduviidae). The pedicels of species from tribe Rhodniini differ from species of Cavernicolini and Triatomini, mainly by the absence of trichoid and basiconic sensilla and by a greater number of Bristles I. Fifth-instar nymphs of T. sordida and R. pictipes show several differences in sensilla patterns compared with their respective adults. They lack basiconic sensilla and thin-and thick-walled trichoid sensilla over the first flagellar segment and over the proximal half of the second flagellar segment. T. sordida nymphs also lack these sensilla on the pedicel. There appears to be a significant sexual dimorphism in relation to trichoid sensilla in T. sordida, but not in R. pictipes. There exists a remarkable correlation between the density of basiconic and trichoid sensilla on the pedicels of different species, and a crude estimation of habitat range assessed as number of habitat types reported for each species.