Xysticus ulmi
| Xysticus ulmi | ||||||||||||
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Xysticus ulmi , female |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Xysticus ulmi | ||||||||||||
| ( Hahn , 1831) |
Xysticus ulmi is a species of spider from the family of the crab spiders (Thomisidae). The species iswidespread and commonin Central Europe .
features
The species is one of the medium-sized crab spiders. Males have a body length of 3 to 4 mm, females reach 5–8 mm. Like many crab spiders, the species shows a clear sexual dimorphism in terms of color and pattern.
The front body ( prosoma ) of the female is dark brown on the upper side, in the middle there is a broad, light brownish to pale yellow longitudinal band, which surrounds a brown spot that is broad in front and tapering to the rear, i.e. approximately V-shaped. The rear part of the body ( opisthosoma ) shows on a lighter background a brownish leaf markings interrupted at the front and three light transverse bands on the back. The legs are quite monochrome light beige to brown and intensely, finely, darkly spotted.
Males are similar to females, but are markedly darker and more contrasty. In Central Europe there are a number of very similar species of the genus; the reliable determination of the species is therefore only possible through a macroscopic examination of the genital organs (genital morphological).
distribution and habitat
Xysticus ulmi colonizes large parts of the Palearctic from Ireland and Portugal in the west to northeast China and as far as the Amur lowlands in the east. In a north-south direction, the distribution extends from Scandinavia to Turkey and further east to northern Afghanistan . The distribution area includes the temperate to Mediterranean zone. Xysticus ulmi occurs all over Europe. The species shows a clear connection to humid habitats and lives mainly in nutrient-poor bogs , swamps and their silting zones as well as the edges of small bodies of water. The animals usually stay low in the vegetation in the moss and grass layers. Sexually mature animals are found in Central Europe mainly in June and July.
Danger
The species is widespread and common in suitable habitats. In Germany it is classified as "safe" in the Red List .
swell
literature
- Ralph Platen, Bodo von Broen, Andreas Herrmann, Ulrich M. Ratschker, Peter Sacher: Total species list and red list of spiders, harvestmen and pseudoscorpions of the state of Brandenburg (Arachnida: Araneae, Opiliones, Pseudoscorpiones) with information on frequency and ecology. Nature conservation and landscape management in Brandenburg 8, booklet 2 (supplement); 1999.
Individual evidence
Web links
Xysticus ulmi in the World Spider Catalog
- W. Nentwig, A. Hänggi, C. Kropf & T. Blick (Eds.): Spinnen Mitteleuropas - Identification key, genus Xysticus. online ( Memento from January 23, 2010 in the Internet Archive )