Keeled river hawk
| Keeled river hawk | ||||||||||||
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Keeled river hawk ( Oxygastra curtisii ) |
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Oxygastra | ||||||||||||
| Selys , 1870 | ||||||||||||
| Scientific name of the species | ||||||||||||
| Oxygastra curtisii | ||||||||||||
| ( Dale , 1834) |
The keeled river hawk ( Oxygastra curtisii ) is the only type of river hawk that is monotypical within the hawk dragonflies (Corduliidae). It was named by the zoologist James Charles Dale after his colleague John Curtis .
features
The dragonflies have a wingspan of 6.5 to 7 centimeters. On segments one to seven as well as the tenth of the males' abdomen there is a dorsal yellow spot. In the female animals, this sometimes occurs on segments eight and nine. This stain disappears with age.
habitat
They occur in south-western Europe on bushy river banks . Otherwise they sit on branches. You have fixed sleeping places off the bank in the bushes. They are generally rare, only common in places.
From 1940 to 1943 this species was sighted in Germany at the mouth of the Sieg. Only in 1999 was another specimen discovered in the south of the Eifel .
Way of life
The males patrol back and forth along the bank, but often stop in place during the flight. They fly from June to August.
Reproduction and development
The females lay their eggs in flight by briefly dipping their abdomen into the water. They also often fly through the bank vegetation. The larvae develop in the mud and live completely covered in it.
supporting documents
- ^ Hansruedie Wildermuth: The falcon dragonflies in Europe. (= Neue Brehm-Bücherei. Volume 653). Westarp Sciences, Hohenwarsleben 2008, ISBN 978-3-89432-896-2 , p. 359.
literature
- G. Jurzitza: The Kosmos dragonfly guide . Franckh-Kosmos Verlag, Stuttgart 2000, ISBN 3-440-08402-7 .
- K. Sternberg: Oxygastra curtisii (Dale, 1834) - Keeled river falcon. In: K. Sternberg, R. Buchwald (Ed.): Die Libellen Baden-Württemberg. Volume 2: Dragonflies (Anisoptera). Ulmer, Stuttgart 2000, ISBN 3-8001-3514-0 , pp. 231-236.
Web links
- Oxygastra curtisii in the endangered Red List species the IUCN 2006. Posted by: Boudot et al , 2005. Retrieved on 11 May, 2006.