Family Amaurobiidae (Laceweb spiders)
Body length 6-12 mm.
The female of this spider is considerably fatter than the male, but both share the same identifying characteristics. The legs and carapace are a glossy brown colour, the legs adorned with a series of darker brown rings. The top of the velvety abdomen has a dark wedge-shaped mark surrounded by a creamy-gold. Very similar to Amaurobius fenestralis and accurate identification can only be made by microscopic examination of the genitalia, so these images are representitive only.
It feeds on insects caught in its web. When the spiderlings hatch the mother dies and provides nourishment for her growing young with her own remains.
The adult females are seen all year round, the males June to November. They are commonly found in an untidy lace of web around window frames, under the eaves of buildings, under old pots, in the hollows of old tree trunks in woodland, and under rocks, stones and logs. A common and widespread species throughout Britain. Native.