A small spider at around 3 mm. The species is quite variable and the zig-zag band of the abdomen can be white or barely visible. The head is dark and quite shiny. It is very similar to Theridion melanurum and detailed examination is needed for a reliable id.

Although individual spiders may over-winter in houses, the species is most often found away from buildings, unlike the very similar T. melanurum. The webs are usually constructed on the trunks of trees and on the foliage of shrubs, but also on rock faces by the sea.

Adults are mainly found from early to mid-summer.

The species is widespread and fairly frequent in much of southern Britain but much less so in much of the north.

Fairly frequent in Leicestershire and Rutland.

2,118 British records for this species to 2014.