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.

Zanderij Crailo, Hilversum, The Netherlands, 22 June 2013