Tetragnatha sp

Class: Arachnida
Order: Araneae
Suborder: Araneomorphae
Family: Tetragnathidae
Subfamily: Tetragnathinae
Genus:Tetragnatha Latreille, 1804

Las hembras de esta especie de arañas son sólo ligeramente más grandes que los machos. Unas y otros se caracterizan por sus mandíbulas alargadas y su postura característica, con las patas estiradas por delante de la cabeza y por detrás del abdomen, dando la impresión de una ramita seca.
Tejen telas redondas, en general próximas a depósitos de agua, con las que atrapan diversos insectos.
Su área de distribución comprende gran parte de la Europa meridional y central, pudiéndose ver a los adultos entre junio y septiembre.

Fuente:http://herramientas.educa.madrid.org/animalandia/

Tetragnatha is a genus of spiders containing hundreds of species. They are found all over the world, although most occur in the tropics and subtropics. They are commonly called stretch spiders, referring to their elongated body form. When disturbed they will stretch their front legs forward and the others in the other direction, thus being able to hide on blades of grass or similar elongated substrates. They are able to run over water.
One of the biggest and most common species is T. extensa, which has a holarctic distribution. It can be found near to lakes, river banks or swamps . In the stratum of reed, tall gras or minor trees and shrubs these habitats are sometimes literally ruled by thousands of individuals of the stretch spiders who build their radial nets with sticky silk.
A shift to cursorial behavior in the Hawai'ian Tetragnatha species seems to have occurred very early on arrival of the ancestor on the island chain.

Fuente:Wikipedia

Especies Ibericas:

Tetragnatha extensa (Linnaeus, 1758)
Tetragnatha isidis (Simon, 1880)
Tetragnatha montana Simon, 1874
Tetragnatha nigrita Lendl, 1986
Tetragnatha nitens (Audouin, 1826)
Tetragnatha obtusa Koch, C. L, 1837
Tetragnatha pinicola Koch, L., 1870
Tetragnatha striata Koch, L., 1862

Cartagena 2007