Corduliidae

The Corduliidae (sensu stricto) comprises 22 genera and 164 species of mostly Holarctic genera, a few Neotropical groups, and a predominantly Australasian group related to Hemicordulia. Corduliids are strong fliers, mostly inhabiting areas around submontane torrential streams but also lakes, ponds, and bogs. Nymphs live usually in mucky edges of primary forest streams and bogs. Adult male corduliids have an acute anal angle on the hind wings and small auricles on abdominal segment 2, except Hemicordulia. Three genera occur in Thailand: Hemicordulia with two species, Procordulia artemis, and Somatochlora with one undetermined species. Idionyx and Macromidia traditionally have been included in Corduliidae. Presently, they are considered as incertae sedis. The corduliids were long considered either as a subfamily of Libellulidae or with the rank of family. Recent phylogenetic studies based on morphological and molecular analyses consider Corduliidae as the sister group of Macromiidae.