The Reed beetle Donacia aquatica

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Classification Order: Coleoptera– Leaf Beetles Family: Chrysomelidae

Length .


HabitatThe threats to this species come mainly from water abstraction, draining of lakes and ponds anddisturbance to marginal vegetation. Pollution of existing habitat would also have negativeconsequences.

IdentificationDonacia aquatica is a distinct, metallic blue beetle (image). It was formerly widespread, althoughlocal, across large parts of Britain (distribution map). Nowadays this beetle seems to be restrictedto Inverness-shire and a few other sites in England

Life Cycle


Habitat Adult reed beetles usually occur in small numbers on emergent aquatic vegetation at the marginsof open water. These habitats are often dominated by sedges, such as Carex acutiformis, reedsweet grass (Glyceria maxima), and bur-reeds (Sparganium spp.).The larvae are aquatic, feedingbelow the surface on the submerged parts of emergent vegetation. The adults are active in good weather during May and June.