What is "somatochlora"

Somatochlora is a genus of dragonflies in the family Corduliidae. Members of this genus are medium-sized dragonflies with dark bodies and a metallic green lustre. The abdomens of males are distinctive, with the first two segments bulbous-shaped, the third constricted, and the rest of the abdomen club-shaped with a straight ending. The exception is S. borisi, which is shaped like a Cordulia species. There are usually two crossveins between the hind wing base and the triangle, where Cordulia have only one crossvein.