Length 3 to 4.8 mm. Prosoma brown, with dark margin and radial stripes. Sternum brown, tinged with black.  Legs yellow-brown. Opisthosoma grey to almost black. 

Confirmation to species level requires examination of the genitalia of mature specimens. 

Found in a wide range of damp habitats but often associated with sewage treatment plants. 

Summer-Autumn. 

Widespread but scattered in Britain. 

Locally common in Leicestershire and Rutland.

https://srs.britishspiders.org.uk/portal.php/p/Summary/s/Leptorhoptrum+robustum