Over all length 12mm. Very similar to D. simpex, but the elytra have a metallic purple streak.
The margins of water bodies where emergent plants, especially bur-reeds, grow. The adults feed on the leaves and the larvae feed under water on the stems and roots.
Status and distribution
Common and widespread throughout southern Britain, less common further north. Common in Nottinghamshire and at Netherfield Lagoons.
Best time to see
May to August.