Thomisidae  Sundevall, 1833 / Xysticus  C. L. Koch, 1835   82 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 2020): Europe, Turkey, Caucasus, Russia (Europe to Middle Siberia), Kazakhstan
Figures
Distribution List
Austria   (no references) ||| Azerbaijan   (Otto, 2020) ||| Belarus   (Ivanov, 2013) ||| Finland   (Koponen et al., 2016) ||| Germany   (no references) ||| Romania   (no references) ||| Russia, Central   (no references) ||| Russia, Eastern   (no references) ||| Russia, Northern   (no references) ||| Slovakia   (no references) ||| Switzerland   (no references) ||| Turkey (Asia)   (Danışman et al., 2019) ||| Ukraine   (Polchaninova & Prokopenko, 2019) |||
References

Azheganova N S (1968) Kratkii opredelitel' paukov (Aranei) lesnoi i lesostepnoi zony SSSR. Akademia Nauk SSSR, 149pp. pdf

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

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

Ivanov V V (2013) The checklist of Belarusian spiders (Arachnida, Araneae). Zoology and Ecology 4: 293-311 pdf

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

Koponen S, Fritzén N R, Pajunen T (2016) Checklist of spiders in Finland (Araneae). 6th version, December 2016, online at http://biolcoll.utu.fi/arach/checklist_of_spiders_in_Finland.htm pdf

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

Otto S (2020) Caucasian spiders. A faunistic database on the spiders of the Caucasus Ecoregion. Database version 03.2020. Internet: caucasus-spiders.info.

Polchaninova N, Prokopenko E (2019) An updated checklist of spiders (Arachnida: Araneae) of Left-Bank Ukraine. Arachnologische Mitteilungen 57: 60-64 & App pdf

Thaler K, Knoflach B (1995b) Xysticus obscurus Collett - eine arktoalpine Krabbenspinne neu für Österreich (Arachnida, Araneida: Thomisidae). Berichte des Naturwissenschaftlich-Medizinischen Vereins in Innsbruck 82: 145-152 pdf

World Spider Catalog (2020) World Spider Catalog. Version 21.0. Natural History Museum Bern, online at http://wsc.nmbe.ch (20.03.2020) doi: 10.24436/2 pdf

Updates
21-10-2015 Distribution update Detail