Thomisidae  Sundevall, 1833 / Xysticus  C. L. Koch, 1835   106 species

Xysticus viduus  Kulczyński, 1898

Description

Male palp with 2 tegular apophyses, median one with massive, large tip pointing to prolateral anterior margin of tibia, second branch small and hook-shaped. Lateral apophysis horn-like shaped, with lobe-like process on posterior edge. Tibial apophysis bipartite, ventral apophysis strongly projecting retrolaterally, with apical median groove. Retrolateral apophysis long and tapering toward the tip in ventral view, with wart-shaped protrusion on tip. Epigyne with very large, broad and shallow groove, which is distinctly marked off by heart-shaped sclerotised ridge. Vulva consists of 2 wide entrance ducts. Prosoma dark brown with median, broad, cream stripe. Eye field bright, beige-brown. Sternum cream median part and dark brown to yellow-brown on margin. Chelicerae spined. Female: with compact and small chelicerae. Legs brown, dorsally darker with bright longitudinal stripes. Opisthosoma oval, brown to dark brown (grey-beige in females) with white anterior margin, with broad, white folium, that can be diffuse in females. Spinnerets female: cream beige, male: brown.

Body length male: 4.4-5.3 mm
Body length female: 5.3-8.2 mm
Additional information

In vegetationless gravel plains and in pioneer-vegetation near water borders

Frequency: Very rarely found

Distribution
  Presence
  No data
Global distribution (WSC 2019): Europe, Turkey, Caucasus, Russia (Europe to Middle Siberia), Kazakhstan
Figures
References

Azheganova N S (1968) Kratkii opredelitel' paukov (Aranei) lesnoi i lesostepnoi zony SSSR. Akademia Nauk SSSR: 1-149

Danışman T, Kunt K B, Özkütük R S (2019) The checklist of the spiders of Turkey. Version 2018 [last updated 1 January 2019], online at http://www.spidersofturkey.info

Hänggi A, Stäubli A (2012) Nachträge zum „Katalog der schweizerischen Spinnen“: 4. Neunachweise von 2002 bis 2011. Arachnologische Mitteilungen 44: 59-76

Helsdingen P J van (2010a) Araneae. In: Fauna Europaea Database (Version 2010.1), online at www.european-arachnology.org

Jantscher E (2001a) Revision der Krabbenspinnengattung Xysticus C.L. Koch, 1835 (Araneae, Thomisidae) in Zentraleuropa. Dissertation: 1-328 pdf

Miller F, Zitnanska O (1976) Einige bemerkenswerte Spinnen aus der Slowakei. Biologia Bratisl 31: 81-88

Otto S (2017) Caucasian spiders. A faunistic database on the spiders of the Caucasus Ecoregion. Database version 08.2017. Internet: caucasus-spiders.info.

Thaler K, Knoflach B (1995b) Xysticus obscurus Collett - eine arktoalpine Krabbenspinne neu für Österreich (Arachnida, Araneida: Thomisidae). Ber Nat - Med Ver Innsbruck 82: 145-152

World Spider Catalog (2018) World Spider Catalog, version 19.5. Natural History Museum Bern, online at http://wsc.nmbe.ch (15.07.2018) doi: 10.24436/2

Updates
21-10-2015 Distribution update Old value