Common extensor spider

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Common extensor spider
Common street spider (Tetragnatha extensa), female

Common street spider ( Tetragnatha extensa ), female

Systematics
Class : Arachnids (arachnida)
Order : Spiders (Araneae)
Family : Extender spiders (Tetragnathidae)
Genre : True extensor spiders ( Tetragnatha )
Type : Common extensor spider
Scientific name
Tetragnatha extensa
( Linnaeus , 1758)

The common stretch spider ( Tetragnatha extensa ) belongs to the family of the stretch spiders within the order of the web spiders (Araneae) . It occurs all over Europe .

description

The common stretch spider is the largest species of the genus of true stretch spiders in Central Europe. Females are 10–12 mm long, males 6–9 mm long. Front body ( prosoma ) and legs are monochrome beige-brown.

The elongated rear part of the body ( opisthosoma ) has a narrow, dark line drawing on a yellowish to greenish background with an indicated center line, which is usually surrounded by a dark, fine-meshed drawing. The underside is dark brown.

Males have a large thorn on the base of the chelicerae , which is used to clamp the chelicerae of the female during copulation.

distribution and habitat

The species colonizes the entire Holarctic , Oceania , Australia and New Zealand. The distribution area includes the arctic to subtropical zones. It occurs all over Europe. It lives in meadows and tall herbaceous meadows in open landscapes, almost always near water.

Way of life

Common extensor spiders mating. The chelicerae of the female are blocked by the male with its own chelicerae.
Common extensor spider (female) in typical, well-camouflaged rest position

The extensor spider builds small wheel nets with an open hub on blades of grass and plant stalks near the ground or directly above the water surface . At rest, it sits in an elongated position on the underside of leaves and twigs and is thus very well camouflaged. Sexually mature animals occur from May to September. Mating takes place in Central Europe mainly in June: During the mating process, the male holds the female chelicerae with his chelicerae. The cocoon is very characteristic; it shows numerous irregular, gray or greenish appendages and is usually attached to a blade of grass.

Danger

The species is widespread and common in suitable habitats. In Germany it is classified as "safe" in the Red List .

literature

  • Heiko Bellmann : Cosmos Atlas Arachnids of Europe. 3. Edition. Kosmos, Stuttgart 2006, ISBN 3-440-10746-9 .
  • 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. In: Nature conservation and landscape maintenance in Brandenburg. 8, issue 2 (supplement), 1999.

Web links

Commons : Common Streckerspider  - Album with pictures, videos and audio files

Tetragnatha extensa in the World Spider Catalog

  • T. Blick, R. Bosmans, J. Buchar, P. Gajdoš, A. Hänggi, P. Van Helsdingen, V. Ružicka, W. Starega, K. Thaler: Checklist of the Spiders of Central Europe. Checklist of the spiders of Central Europe. (Arachnida: Araneae). Version December 1st, 2004. (arages.de)
  • W. Nentwig, T. Blick, D. Gloor, A. Hänggi, C. Kropf: Spinning Europe. Version 06.2016. (www.araneae.unibe.ch)
  • Distribution map of the common extensor spider

Individual evidence

  1. ^ Map of the global distribution of the common extensor spider from the British Arachnological Society