Xylota segnis
Common Langbauchschwebfliege, females
The common Langbauchschwebfliege ( Xylota segnis ) is a species of fly from the family of hoverflies (Syrphidae ). It is the commonest species of the genus Xylota.
Origin of the name
The scientific name is derived from the Latinized form of the rare Byzantine- Greek ξυλωτή [ xsylōtē ] / k ͜ sulɔ tɛ ː ː ̌ / ' wooden, wood - " and Latin segnis " lazy, casual " together. Both adjectives is Latin musca " fly " to complete, so there is as a translation of the taxon " sluggish wood fly ". The ξύλον of [ xylon ] / k ͜ sǔlon / "wood" derived part of the generic name is, according to the designation by Johann Wilhelm Meigen in 1822 for the habitat of the larvae.
Features
Elongated style with a body length of 10-13 mm. Vertex bluish- black shiny yellow and hairy. The light on the eye rims hairy forehead ( frons ) and the face is bright pollinated. The sensor including Arista are dark. The mesonotum and the scutellum are metallic and shiny. The pleurae are bright pollinated. The abdomen is black, the second and third segments reddish with black center line. The legs have a yellow and black drawing and a comb-like arbor series to the thickened hind legs. The wings are light brown with a brown Flügelmal ( pterostigma ), the halteres ( halteres ) are bright yellow.
The white- yellow larvae have a length of 8-12 mm. They are elongated rice-grain shape and kurzschwänzig. On Analsegment is a short, wide breathing tube and 6 paired skin flaps.
Confusion
The common Langbauchschwebfliege can be confused with the Blackfoot Langbauchschwebfliege ( Brachypalpoides lentus ), but has dark legs without drawing and not spined hind legs.
Occurrence
The type is in Europe with the exception of the Far North, North Africa, Siberia spread to the Pacific coast, Japan and North America. In Central Europe it is not uncommon in the mountains. It prefers forest and can be found at the forest edge and clearings, but also comes synanthropic in gardens and parks before. The animals fly in Central Europe from May to September with a peak in June.
Way of life
In contrast to the females, who move away in search of suitable oviposition sites by Schlup Fort ( Dismigration ), the males show a strong territorial behavior. One can often observe the way they run around fast and restless on sunlit leaves or stumps there to collect pollen from the surface. Pollen grains from the feces of other Syrphidae are also accepted as a food. They are fast fliers and although rare, flower visitors of hazelnut, raspberry, hawthorn and cypress spurge. The species is polyvoltin with up to three generations per year.
The saprophagous larvae are found under the bark of rotting logs, at sites of outflowing tree sap, rotting sawdust on and on decaying vegetables. They overwinter and pupate in the spring. The larvae are parasitized by parasitic wasps of the species Rhembobius Perscrutator.