This is a very small spider. The male has a 2 mm body length and is smaller than the female which has a 3 mm body length. The uniformly orange-red abdomen is most distinctive, whilst the head is darker almost back. There is also a blackish patch at the rear of the abdomen which is probably best seen from beneath. There are no other spiders with a similar appearance.
O. melanopygius occurs in a very wide range of habitats, particularly rubbish heaps and gardens, under stones etc and occasionally occurring indoors.
All year but mainly found from spring through to autumn.
Distribution: The species is widespread but patchy in much of England, and very scattered elsewhere in Britain.
Fairly frequent in Leicestershire and Rutland.
898 British records to Jan 2013
Leicestershire & Rutland Map
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