N A T U R K U N D L I C H E S   I N F O R M A T I O N S S Y S T E M

Evarcha arcuata (Clerck, 1758)

(zoological nomenclature: valid name, available)

General information:

Evarcha arcuata (Clerck, 1758)
Synonyms, misspellings, wrong determinations, etc.:
Araneus arcuatus Clerck, 1757 Clerck, 1757, Aranea marcgravii Scopoli, 1763; Aranea grossipes De Geer, 1778, Aranea truncorum Schrank, 1781; Salticus grossipes Latreille, 1819 ; Attus limbatus Hahn, 1826; Dendryphantes grossus C. L. Koch, 1837

Habit:

 
: Fruška gora (Beočin), 2006. : Fruška gora (Beočin), 2006 : Fruška gora (Beočin), 2006  
Picture from: © Savic Dragisa 2010
Detailed view
Picture from: © Savic Dragisa 2010
Detailed view
Picture from: © Savic Dragisa 2010
Detailed view
 

Description of adults: Examined: 7 9 . Body length: about 7 mm, about 7 mm. There is some color dimorphism between sexes. Female is gray or gray-brown. On the abdomen have diagonal black lines. Legs are in the same color as body. On the front of the face they have thin white hair, so it looks like they have some sort of face – mask. Male is black, with some small pale parts on legs, and sometimes white lines on the abdomen. Facemask is more visible. (Nentwig at all, 2003)

Distribution:

According to Platnick (2010) this species has Palearctic distribution. In Europe it is recorded almost in all country on mainland, but not on the islands except England (van Helsdingen, 2010).

Biology:

This hairy creature with huge eyes is very common species on grasslands and heathlands. Like other jumping spider, doesn’t have a web and ambush its prey. Silk is only used for the retreat, the dragline and the cocoon. Their large eyes give them excellent eyesight, so they can notice a prey from a distance of about 30 - 40 cm. During courtship, they have a special dance, male send signals to its mate by waving with his palps and front legs. Adults could be found in nature from May till August.

Anatomy:

Male palp : strongly sclerotized embolus, final part curled up. Bulbus not round. Tibialapophyse is long and pointed. Epigyne: Sclerotized part of the epigyne is wide and square. for more details please see this spider key: further details (Nentwig et al. 2010)

Diagnosis:

Sometimes female of this species could be confused with E. falcata . They have similar grey - brown modest appearance, and very similar epygine. The epygine of E. falcata is more triangular, but solid difference could be found in structure of vulva. for more details please see this spider key: further details (Nentwig et al. 2010)

Importance for humans:

Not dangerous to humans. This species has too weak helicere to penetrate the skin.

Worth knowing:

Sources:

Helsdingen, P. van 2010. Araneae. Fauna Europaea version 2.2., http://www.faunaeur.org [online 19 June 2010].
Nentwig W., A. Hänggi, C. Kropf & T. Blick 2003. Spinnen Mitteleuropas/Central European Spiders. An internet identification key. http://www.araneae.unibe.ch Version of 8.12.2003 [online 19 June 2010].
Platnick N. I. 2010. The world spider catalog, version 11.0. American Museum of Natural History, online at http://research.amnh.org/entomology/spiders/catalog/index.html [online 19 June 2010].
Savic´ D. 2010. Nature Photography by Dragiša Savic´ online at http://www.naturefg.com/index.html [online 19 June 2010].

Publication data:

history:
Grbic Gordana: 2010.12.03
Grbic Gordana: 2011.04.03
Grbic Gordana: 2011.04.04
Grbic Gordana: 2011.04.07
Grbic Gordana: 2011.04.10
Document reviewed by:
not reviewed: 2011.04.10
Document released by:
Grbic Gordana: 2011.04.10

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