Size: 6.2 to 8.9 mm. The elytra can give a dark purplish or bronzy appearance depending on light conditions.

Other Donacia species.

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.

Various still and flowing water-bodies where there are Pondweeds (Potamogeton sp.).

Most likely to be encountered in July and August.

Associated with Pondweeds (Potamogeton sp.).

It is quite local in Britain.

Status in Leicestershire and Rutland not known.