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

Araneus quadratus Clerck, 1757

(zoological nomenclature: valid name, available)

General information:

Araneus quadratus Clerck, 1758
Synonyms, misspellings, wrong determinations, etc.:
Araneus reaumuri Scopoli, 1763
Araneus flavidus Yin et al. 1990

Four-Spot Orb-Weaver
Epeire carrée ou épeire ā quatre points
Vierfleck-Kreuzspinne

Habit:

     
Original picture      
Picture from: Clerck 1757
Detailed view
     

Description of adults: Examined: 2 . Body length: about 11 mm, about 20 mm (Nentwig et al., 2003). Prosoma pale brown with dark line on the edges. Abdomen yellow-brownish with 4 large white spots; legs pale brown, banded. Prosoma pale brown with dark line on the edges. Abdomen round, greenish, sometimes brown, or red , always with 4 large white spots, and several small; legs pale brown, banded.

Distribution:

The species is very common throughout the Palaearctic region (Platnick, 2010) In Europe, it has been reported from most countries, except some regions of the Balkans and most Mediterranean islands (van Helsdingen, 2010).

Biology:

     
: Serbia, Fruška gora, Bukovac, 2006      
Picture from: © Savic Dragisa 2010
Detailed view
     

The species builds a vertical orb-web in the low vegetation, but usually can be found in silk retreat on the branch beside the web. It mostly feeds on jumping insects such as grasshoppers. Usual habitats for this species are grassland, heath land and scrubs. In Europe, adults are present in nature from VII-IX.

Anatomy:

male palp: median apophysis is deep bifurcated. female epigyna: basal part of the scapus is broadened for more details please see this spider key: further details (Nentwig et al. 2010)

Diagnosis:

This species is very similar to A. marmoreus. Both have 4 large white spots on the abdomen, but A. marmoreus has more lateral broad stain, that sometimes looks like bandage. There are clear differences in genital structure. On palp, median apophysis of A. marmoreus is rounded, and the basal part of scapus on epigyna is not broad. A. quadratus is common in open fields, while A. marmoreus on the dump forest edges.

Importance for humans:

He can bite, but it is not dangerous.

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: 2010.07.08
Grbic Gordana: 2010.07.12
Grbic Gordana: 2010.07.13
Grbic Gordana: 2010.12.04
Grbic Gordana: 2011.04.07
Grbic Gordana: 2011.04.10
Kurz Michael: 2013.10.22
not reviewed

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