Dragonflies (Insecta: Odonata) of two glacial lakes and new data for Trithemis annulata in the north-eastern part of Italy

A survey of Odonata was carried out in the northeastern part of Italy, in the Friuli Venezia Giulia region. Sampling sites included two glacial lakes of ancient origin, Ragogna Lake and Cornino Lake. Aiming for a general overview of the species composition, sampling effort was conducted between May 2020 and April 2021. A total of 30 species of Odonata were collected, belonging to 17 genera and 8 families. The most representative family was Aeshnidae (31%), while Calopterygidae and Libellulidae each comprise 15%, and Lestidae, Coenagrionidae, Platycnemididae, Cordulegastridae, and Corduliidae each comprise 8% of the total number of species. The most important result was the finding of 16 individuals of Trithemis annulata, a newly recorded species for Friuli Venezia Giulia and for the whole Northeast Italy, representing one of the most northeastern data for the species worldwide.