Doubt
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Double spot ( Epitheca bimaculata ) after hatching |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Epitheca bimaculata | ||||||||||||
| ( Charpentier , 1825) |
The two-spot ( Epitheca bimaculata ) is a large dragonfly species from the family of falcon dragonflies (Corduliidae).
features
These dragonflies have a wingspan of 8 to 9.5 centimeters. They have a black basal spot on the hind wing. The abdomen is orange-brown with a pronounced dark vertical stripe in the middle. The abdomen is 39 to 43 millimeters long. The chest is dark brown.
Similar species
Occurrence and way of life
The Zweifleck lives on larger still waters such as lakes and ponds with reeds and rushes . It is very rare and in many places its population is endangered or threatened with extinction.
The males fly back and forth in open water and rarely visit the shore. You almost never find her sitting. The flight time is very short, from late May to mid-June.
Reproduction and development
The mating starts on the water and ends on the treetops or in the bushes. The females squeeze out a brownish lump of up to 2000 eggs that is larger than their head. The abdomen is raised more and more. Only then do they fly out onto the water and brush it off on aquatic plants . This then forms a spawning cord approx. 50 centimeters long, which is reminiscent of toad spawn and which adhere to plant material near the surface.
The larvae fall after slipping to the ground and capture their food between aquatic plants. They have remarkably long legs. They take two to three years to develop.
literature
- Gerhard Jurzitza: The Kosmos dragonfly guide . - Franckh-Kosmos Verlags GmbH & Co., Stuttgart, 2000. ISBN 3-440-08402-7
- Lehmann & Nüß: dragonflies. - German Youth Association for Nature Observation (DJN), 5th edition, 1998. ISBN 3-923376-15-4 [1]
Trockur, B. & K. Sternberg (2000): Epitheca bimaculata (Charpentier, 1825) - Zweifleck. Pp. 218-231. in: Sternberg / Buchwald (ed.): Die Libellen Baden-Württemberg. Volume 2: Dragonflies (Anisoptera). Ulmer, Stuttgart, ISBN 3-8001-3514-0
