This species displays strong sexual dimorphism: The male is black and shiny with a narrow abdomen that often has two white spots, and with a body length (excluding legs) of around 5 mm; The female is slightly larger with a much plumper, slivery abdomen bearing a leaf-shaped black mark.
Microlinyphia impigra is similar but females have thinner dark cardiac mark. Males usually lack the abdominal white patches seen on M. pusilla.
This species spins a horizontal sheet web in low vegetation in a wide range of habitats including heathland, but is perhaps commonest in grassland.
Both sexes are mature in spring and summer, with a peak from early to mid-summer, individuals occasionally persisting into the autumn.
The species is widespread in much of Britain.
Fairly frequent in Leicestershire and Rutland.
4036 British records to Jan 2013
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015