Dragonfly communities from the upper-middle basin of the Tâmega River (north-eastern Portugal) (Insecta: Odonata) Abstract: The Odonata communities of the upper-middle basin of the Tâmega river (Portugal) were analysed by sampling of adults and exuviae in 2010 and 2011. Thirty-seven dragonfly species were found, which account for half of those known from the Iberian Peninsula and 60% of the Portuguese species. The most frequent species in the area were Calopteryx virgo, Cordulegaster boltonii, Boyeria irene, Anax imperator, Pyrrhosoma nymphula, Platycnemis latipes, Onychogomphus uncatus, Calopteryx xanthostoma and Orthetrum coerulescens. Furthermore, large populations of Macromia splendens, Oxygastra curtisii and Gomphus graslinii, protected species included in Habitats Directive, were frequent in the area. Coenagrion mercuriale, another protected species, presented a more restricted distribution in the study area.