The Blue dasher (Pachydiplax longipennis) is a dragonfly of the skimmer family. It is common and widely distributed in the United States.
Male on a Lotus Leaf
Mature males develop a bluish-white pruinescence on the back of the abdomen and, in western individuals, on the thorax. They display this pruinescence to other males as a threat while defending territories at the edge of the water.
Mature male with blue-white abdomen and thorax
Although the species name longipennis means "long wings", the wings are not substantially longer than those of related species. Females do, however, have a short abdomen that makes the wings appear longer in comparison.
^ abNeedham, James G.; Minter J. Westfall, Jr. and Michael L. May (2000). Dragonflies of North America (rev. ed.). Gainesville, FL: Scientific Publishers. pp. 762–763. ISBN0-945417-94-2.Cite uses deprecated parameters (help)
^Johnson, Clifford (1962). "A Study of Territoriality and Breeding Behavior in Pachydiplax longipennis Burmeister (Odonata:Libellulidae)". The Southwestern Naturalist (Southwestern Association of Naturalists) 7 (3/4): 191–197. doi:10.2307/3668841. JSTOR3668841.