|Male, taken at Kadavoor, India|
|Juvenile male, taken at Kadavoor, India|
Potamarcha congener is a species of dragonfly in the family Libellulidae. It was first described by Jules Pierre Rambur in 1842, almost fifty years before Friedrich Karsch described its genus.
Potamarcha congener is common through much of its range, which stretches through parts of South Asia, South-East Asia, and Oceania, including in countries such as India, Indonesia, China, Australia, and Vietnam. Owing to its wide distribution, the species has been classified as Least Concern by the International Union for Conservation of Nature.
Potamarcha congener, known as a yellow-tailed ashy skimmer, common chaser, or swampwatcher, is a medium-sized dragonfly with a bluish black thorax and yellow tail with black markings. Face is olivaceous yellow to steel black or brown. Eyes are reddish brown above and bluish grey below. In male adults, the thorax and first four segments of the abdomen are covered with bluish pruinescence. In young adults, yellow markings are visible through the pruinescence. The rest of the abdomen is black with orange markings, with the last two segments entirely black. The female thorax has yellow and black stripes on the sides. The abdomen is black with dull orange markings, and has prominent flaps on each side of segment eight. The flaps may serve to hold the eggs in place during oviposition.
Female in obelisk posture
- Mitra, A. (2010). "Potamarcha congener". IUCN Red List of Threatened Species. doi:10.2305/IUCN.UK.2010-4.RLTS.T167281A6322956.en. Retrieved 26 April 2017.
- Rambur, Jules (1842). Histoire naturelle des insectes. Névroptères (in French). Paris: Librairie Encyclopédique de Roret. pp. 534  – via Gallica.
- "Species Potamarcha congener (Rambur, 1842)". Australian Faunal Directory. Australian Biological Resources Study. 2012. Retrieved 1 March 2017.
- Schorr, Martin; Paulson, Dennis. "World Odonata List". Slater Museum of Natural History. University of Puget Sound. Retrieved 1 March 2017.
- "Species in the genus Potamarcha". John Caroll University. Retrieved 3 April 2014.
- Theischinger, Günther; Hawking, John (2006). The Complete Field Guide to Dragonflies of Australia. Collingwood, Victoria, Australia: CSIRO Publishing. p. 268. ISBN 978 0 64309 073 6.
- C FC Lt. Fraser (1936). The Fauna of British India, including Ceylon and Burma, Odonata Vol. III. Red Lion Court, Fleet Street, London: Taylor and Francis.
- "Potamarcha congener Rambur, 1842". India Biodiversity Portal. Retrieved 2017-02-16.
- "Potamarcha congener Rambur, 1842". Odonata of India, v. 1.00. Indian Foundation for Butterflies. Retrieved 2017-02-16.
Data related to Potamarcha congener at Wikispecies
Media related to Potamarcha congener at Wikimedia Commons