Olfaction in dragonflies: Electrophysiological evidence

► Olfaction in Paleoptera (Odonata/Ephemeroptera) is still an open question. ► Libellula depressa bears presumed olfactory sensilla on its antennae. ► We performed an electrophysiological investigation (EAG, SCR) on these antennae. ► Depolarizing EAG and SCR responses to chemicals were recorded in males and females. ► This is the first clear identification of olfactory receptor neurons in Odonata.