Donacia obscura

Taxonomy

  • Polyphaga
  • Chrysomeloidea
  • Chrysomelidae
  • Donacia
  • Donacia obscura

Description

Size: 8.1-10.7mm
Basic colour: Dull bronze-brown
Pattern colour: None
Number of spots: None
Pronotoum: As basic colour
Leg colour: As basic colour
Confusion species: Donacia bicolora
, Confusion species: Donacia marginata

Palaearctic.

Biology

Status: Scattered, mainly in the north and west. Scarce (Notable A) but also RDB listed.
RDB Category: Vulnerable (RDB2)
Habitat: Various boggy areas with Cyperaceae (sedges and club-rushes); in Scotland, especially associated with beds of beak-sedges, Rhynchospora spp.
Host plant: Various Cyperaceae, especially bottle sedge, Carex rostrata.
Overwintering: As adults.
Food: Adults on pollen, larval food unknown.

Distribution (may take a minute to appear)

Distribution Map

Donacia marginata

Taxonomy

  • Polyphaga
  • Chrysomeloidea
  • Chrysomelidae
  • Donacia
  • Donacia marginata

Description

Size: 8-10mm
Basic colour: Golden-bronze
Pattern colour: Elytra usually with variable reddish-purple patches and sides.
Number of spots: See pattern
Pronotoum: As basic colour
Leg colour: As basic colour
Confusion species: Donacia bicolora
, Confusion species: Donacia obscura

Palaearctic, including Morocco.

Biology

Status: Widespread and locally common, especially in the south. As far north as SW Scotland.
Habitat: On emergent vegetation, including reedbeds at the edges of various water-bodies and wetland/damp habitats.
Host plant: Branched bur-reed, Sparganium erectum. Possibly also other wetland/emergent plants.
Overwintering: Unknown.
Food: Adults on upper epidermis and pulp of leaves, and possibly also pollen; larvae uncertain but may be found between leaves, eggs being laid between submerged parts.

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Donacia impressa

Taxonomy

  • Polyphaga
  • Chrysomeloidea
  • Chrysomelidae
  • Donacia
  • Donacia impressa

Description

Size: 6.8-8.4mm
Basic colour: Coppery or bronze, sometimes darker.
Pattern colour: None
Number of spots: None
Other colour forms: Rare
Pronotoum: As basic colour
Leg colour: As basic colour
Confusion species: Donacia simplex
, Confusion species: Donacia thalassina

Palaearctic, including North Africa.

Biology

Status: Widespread but scattered, though can be locally common. Scarce (Notable A).
Habitat: Sedges at the edge of water and wetlands.
Host plant: Various Cyperaceae (sedges and club-rush) and other wetland plants.
Overwintering: Unknown
Food: Adults on pollen of Cyperaceae, larvae on rhizomes and roots of common club-rush Schoenoplectus lacustris.

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Donacia semicuprea

Taxonomy

  • Polyphaga
  • Chrysomeloidea
  • Chrysomelidae
  • Donacia
  • Donacia semicuprea

Description

Size: 5.8-7.8mm
Basic colour: Shiny copper, often with greenish reflection on the sides of the elytra.
Pattern colour: None
Number of spots: None
Pronotoum: As basic colour, with a deep midline pit ('sulcus') distinguishing it from other British Donaciinae.
Leg colour: As basic colour but appears pale grey due to dense pubescence.

Western Palaearctic.

Biology

Status: Locally common in England, scattered in Wales and Ireland, not recorded from Scotland.
Habitat: Various habitats where the host plant is present.
Host plant: Sweet-grasses Glyceria spp, mainly reed sweet-grass G. maxima, sometimes plicate sweet-grass G. notata.
Overwintering: Three-year life cycle, adults overwinter in cocoons.
Food: Adults on leaves, larvae at roots (also of branched bur-reed Sparganium erectum).

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Donacia dentata

Size
7-8.8mm
Basic colour
Bright metallic coppery-red/pink or coppery-green, often with a sparkly/'frosty' appearance.
Pattern colour
None
Leg colour
Largely as basic colour, some parts may be red-brown. Hind legs long and curved.

Donacia dentata

Taxonomy

  • Polyphaga
  • Chrysomeloidea
  • Chrysomelidae
  • Donacia
  • Donacia dentata

Description

Size: 7-8.8mm
Basic colour: Bright metallic coppery-red/pink or coppery-green, often with a sparkly/'frosty' appearance.
Pattern colour: None
Number of spots: None
Pronotoum: As basic colour
Leg colour: Largely as basic colour, some parts may be red-brown. Hind legs long and curved.

Palaearctic.

Biology

Status: Sparsely scattered in the southern half of Britain, including Ireland. Scarce (Notable A)
Habitat: On host plants in the middle of dykes.
Host plant: Arrowhead, Sagittaria sagittifolia, possibly also water-plantains, Alisma spp.
Overwintering: Two-year life cycle; larvae overwinter as 1st instar (winter 1) and 5th instar (winter 2)
Food: Adults on upper surface of leaves, larvae submerged on roots and leaf axils.

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Donacia cinerea

Size
7.3-10.5mm
Basic colour
Bronze (rarely dark green) but covered in short, pale pubescence making the colour appear shiny silver-grey to pale brownish. This is unique among British Donaciinae
Pattern colour
None
Leg colour
As basic colour

Donacia bicolora

UKBAP Species
Yes
RDB Category
Vulnerable (RDB2)
Size
8-10.2mm
Basic colour
Bright greenish gold, sometimes (in later summer) greenish-blue to deep purple-blue.
Pattern colour
None
Leg colour
As basic colour