Fact Box Species: Ariadna dysderina (RM) or a closely related species Family: Segestriidae Body length: female: 12 mm male: 10 mm Habitat: This species likes to build a retreat under rocks or logs, this having a distinctive entrance consisting of a dense collar of silk. Radiating threads support it and warn the spider of nearby insects. The burrow also has a lining of threads that run along its length Toxicity: The toxicity of this spider's venom is unknown but it may cause mild illness in humans so this species should be handled with caution

Oblique view Front view Spider underside Burrow entrance In its burrow Burrow entrance

This species mostly is uniformly dark coloured and has three pairs of legs pointing forward and the fourth pair pointing backwards. Only six eyes are present and there is a slit-like spiracle entrance just behind each book lung.

Spider(s) with a very similar appearance: Many other spider species with 'unspecialised' body shapes.