Length 3.8 to 4.3 mm.  Sides more or less parallel. Colour may vary from rufous to almost black. Aedeagus with distinctive tongue-like process. 

Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.

Canals, ponds and wet ditches.

Peak time is April to October.

Widespread and quite frequent in Britain.

Frequent in Leicestershire and Rutland.