Parthenogenetic Ischnura hastata (Say), widespread in the Azores (Zygoptera: Coenagrionidae)

Literature and personal information on the distribution of I. hastata and other odon. spp. in the Azores is reported. /. hastata and I. pumilio are recorded for the first time from the islands of Corvo and Sao Jorge, respectively. I. hastata appears the most common and abundant sp. and its population is formed by only 9 9 (no 6 S were ever recorded). The asexual reproduction of these populations was demonstrated by means of laboratory rearing during several generations. The dispersal ability of this sp. and the possible origin of parthenogenesis after its colonisation of the Azores are briefly discussed. The possible causes of threat are identified and the need for conservation measures is outlined.