author(s)
Deepak D Barsagade, Rani P Thakre, Ganesh B Gathalkar and Jitendra R Kirsan

abstract
Scanning electron microscopic (SEM) studies of the antenna of Rhodischnura nursei (Morton) (Coenagrionidae) and Lestes elatus (Selys) (Lestidae) was investigated comparatively. The antenna of both the species (adult) revealed the presence of various mechano- and chemosensory sensilla. Moreover, the microstructural variations among them were compared, to know the species specificity. The antennal scape of R. nursei comprised of sensilla trichoidea ST-I, ST-II, sensilla trichoidea curvata (STC) and sensilla basiconica (SB). Whereas, the scape of L. elatus bears ST-I, ST-II, STC, SB-I and SB- II. In R. nursei, the pedicel comprised of ST-I, ST-II and microtrichia MT-I, MT-II, whereas, ST and MT are present in L. elatus. Subsequently, the flagellum of R. nursei comprised of MTP-I, MTP-II, MTP-III, while, MTP-I, MTP-II, MTP-III, and MTP-IV were observed in L. elatus. Therefore, the presence of various mechano- and chemosensilla in these damselflies may play a decisive role in olfaction, ability to perceive temperature, humidity or air speed that has been discussed.