Donacia thalassina Germar, 1811
Taxonomy: Polyphaga > Chrysomeloidea > Chrysomelidae > Donacia > Donacia thalassina
Images
Source:
Malcolm Greenwood
Description
Size: 6.6-8.3mm
Basic colour: Shiny bronze, usually with a coppery tinge, sometimes greyish or greenish on the pronotum and elytra.
Pattern colour: None
Number of spots: None
Pronotoum: As basic colour
Leg colour: As basic colour
Confusion species: Donacia impressa
, Confusion species: Donacia simplex
Basic colour: Shiny bronze, usually with a coppery tinge, sometimes greyish or greenish on the pronotum and elytra.
Pattern colour: None
Number of spots: None
Pronotoum: As basic colour
Leg colour: As basic colour
Confusion species: Donacia impressa
, Confusion species: Donacia simplex
Palaearctic. Records from Japan may be incorrect.
Biology
Status: Widespread but uncommon. Scarce (Notable B).
Habitat: By standing water and in marshy areas.
Host plant: Sedges and a range of other water plants.
Overwintering: Three-year life cycle, overwintering as 2nd instar larvae (winter 1) and 5th instar larvae (winter 2). Then, hibernation may occur as pupae or as adults in cocoons.
Food: Adults on pollen from May and on leaves later in the summer. Larvae on roots.
Habitat: By standing water and in marshy areas.
Host plant: Sedges and a range of other water plants.
Overwintering: Three-year life cycle, overwintering as 2nd instar larvae (winter 1) and 5th instar larvae (winter 2). Then, hibernation may occur as pupae or as adults in cocoons.
Food: Adults on pollen from May and on leaves later in the summer. Larvae on roots.