Bulgarian emerald dragonfly
| Bulgarian emerald dragonfly | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name of the genus | ||||||||||||
| Corduliochlora | ||||||||||||
| Marinov & Seidenbusch , 2007 | ||||||||||||
| Scientific name of the species | ||||||||||||
| Corduliochlora borisi | ||||||||||||
| ( Marinov , 2001) |
The Bulgarian emerald dragonfly ( Corduliochlora borisi , syn .: Somatochlora borisi ), also known as the Rhodope emerald dragonfly , is a species of dragonfly from the family of falcon dragonflies (Corduliidae), which belong to the large dragonflies (Anisoptera) and the only representative of the genus Corduliochlora . It was first described by Milen Marinov in 2001 and named after his son Boris. Initially, the species was classified in the genus of the emerald dragonflies ( Somatochlora ).
features
Adult traits
The Bulgarian emerald dragonfly reaches a body length of around 50 millimeters and a wingspan of the hind wings of 31 to 33 millimeters in the male and 33 to 34 millimeters in the female. The length of the abdomen is 34 to 37 millimeters in both sexes. The eyes are bright green in color, the vertex between them and the forehead (front) are dark metallic green with distinct yellow spots on the sides. The prothorax is black and yellow, the synthorax is metallic, shiny green with a thick layer of whitish hairs. The base of the wing is yellowish in color, the basal membrane is whitish and distal becomes brownish. In the fore and in the hind wing, the discoidal cells as well as the anal triangle in the hind wing are each divided by a wing vein . A connecting transverse artery is located between the cubital artery and the anal artery of the fore wing; two are formed in the hind wing.
The abdomen in males is metallic green, with segments 1, 2 and 10 black and segments 3 to 9 greenish. Segment 3 has a large spot on both sides at the base, and parts of segments 7 to 9 are dark brown. The abdomen of the females is also metallic green, here segments 1 and 2 as well as 8 to 10 are blackish. Segments 2 and 3 have yellow spots that extend from the back to the sides, and segments 2 and 4 have elongated yellow spots that extend from the stomach to the sides.
Larval features
The larvae reach a maximum length of 19 to 22 millimeters (corresponds to the length of the exuvia ) and are very similar to those of the Balkan emerald dragonfly ( S. meridionalis ). In contrast to this, it has 4 to 9 back spines on the back on the segments, while a small tuft of hair is formed on S3 instead of a spike. The segments 8 and 9 have side thorns and long hair on the sides. In addition, 4 pairs of long tufts of hair are formed on the back of the thorax and the wing systems each have a dense row of long hairs on the upper edge. The epiproct is broad and trimmed in the middle, with the tip clearly set off.
distribution and habitat
The range of the Bulgarian emerald dragonfly is limited to the region of southeastern Bulgaria , northeastern Greece and northwestern Turkey . The species is only found in isolated sites in the area of the eastern Rhodope Mountains and their foothills in Turkey, the Istranca Mountains .
The reproduction and larval habitats are in the range of running waters with a warm, humid microclimate at heights of 0 to 300 m above sea level, whereby the waters themselves can lie in deep gorges. The type locality was a one to five meter wide and 0.5 to 1.5 meter deep stream with a variable gradient. The ground was muddy, stones and plants were largely missing. Other places also had a muddy to sandy-stony subsoil, had natural barrages with calm water and were usually shady.
Way of life
Very few statements are available about the behavior of the species. The males behave in a similar way to other emerald dragonflies and patrol quietly in search of females over 10 to 50 meters long stretches at a height of 30 to 50 centimeters above the water. They avoid flat banks and mostly fly in shady areas. They behave aggressively on their patrol flights towards other males of the same species, while they do not react to males of syntopically occurring Balkan emerald dragonflies.
Mating begins above the water, after which the pairs will likely fly into the treetops. The eggs are deposited in areas of submerged roots or in the middle of the stream in the open water.
Danger
Due to its very small distribution area, the Bulgarian emerald dragonfly is considered endangered by some authors. The International Union for Conservation of Nature and Natural Resources (IUCN) has them in the Red List of Endangered Species as a type of warning list ("near threatened").
supporting documents
- ^ Martin Schorr, Martin Lindeboom, Dennis Paulson: World Odonata List. Update from December 1, 2014 ( download ).
- ↑ Milen Marinov and Richard Seidenbusch : Corduliochlora gen. Nov. from the Balkans (Odonata: Corduliidae) . In: IDF report . tape 10 , no. 1 , 2007, p. 1-13 .
- ↑ Somatochlora borisi in the IUCN Red List of Threatened Species 2009.2. Posted by: Boudot, J.-P., 2006. Retrieved February 15, 2010.
literature
- Hansruedi Wildermuth: Europe's falcon dragonflies. (= Die Neue Brehm-Bücherei. Volume 653). Westarp Sciences, Hohenwarsleben 2008, ISBN 978-3-89432-896-2 , pp. 394-400.