A new dictyoneurid insect, Dictyoneura goujonorum n. sp. from the Latest Ghzelian-Asselian basin of Graissessac (Hérault, France) is described in details. It is represented by a wellpreserved specimen with wings of 32-35 mm long and 13-14 mm wide and other peculiar diagnostic characters such a MP with four branches and a CuP with three branches. As all the other Dictyoneura species are known from the Namurian and/or the Wesphalian, Dictyoneura goujonorum n. sp. is the youngest representative of the genus. It is also the first record of the order Palaeodictyoptera from the Graissessac basin. The Carboniferous-Permian palaeodictyopterans are well-known to have lived in rather humid swamp forests. The global warming and drying of the climate during the Permian and/or the rise of potential predators may be responsible of their extinction.