Massive web aggregation of Tetragnatha nitens (Audouin, 1826) in the lagoon of Orbetello (Tuscany, Italy) (Arachnida: Araneae: Tetragnathidae)

A massive web aggregation of Tetragnatha nitens (Audouin, 1826) is reported from the lagoon of Orbetello. This gregarious behaviour is likely associated with a large swarming of chironomids, which are usual prey of this species. The record of T. nitens herein reported is the first one for continental Tuscany.