Hydrothassa marginella (Linnaeus, 1758)
Taxonomy: Polyphaga > Chrysomeloidea > Chrysomelidae > Hydrothassa > Hydrothassa marginella
Images
Source:
Roger Key
Description
Size: 3.4-4.5mm
Basic colour: Dark metallic blue and orange-yellow
Pattern colour: Pronotum with yellowish lateral margins.
Number of spots: None
Pronotoum: See 'pattern colour' above.
Leg colour: Dark metallic blue
Confusion species: Hydrothassa glabra
, Confusion species: Hydrothassa hannoveriana
Basic colour: Dark metallic blue and orange-yellow
Pattern colour: Pronotum with yellowish lateral margins.
Number of spots: None
Pronotoum: See 'pattern colour' above.
Leg colour: Dark metallic blue
Confusion species: Hydrothassa glabra
, Confusion species: Hydrothassa hannoveriana
Biology
Status: Common and widespread.
Habitat: Various
Host plant: Various, especially buttercups
Overwintering: Adults overwinter from September to mid April.
Food: Leaves and flowers of host plants (larvae on the undersides of leaves)
Other notes: Similar to H. glabra and H. hannoveriana. Separated from H. glabra by the orange-yellow lateral margins to the pronotum (not present in H. glabra). Separated from H. hannoveriana by the lack of a median elytral stripe (usually present in H. hannoveriana); in specimens of H. hannoveriana where this is absent, the aedeagus may need to be examined in - in H. hannoveriana, the tip has a slight angle near the tip (lateral view), in H. marginella, the tip is more-or-less straight or slightly curved (no angle).
Habitat: Various
Host plant: Various, especially buttercups
Overwintering: Adults overwinter from September to mid April.
Food: Leaves and flowers of host plants (larvae on the undersides of leaves)
Other notes: Similar to H. glabra and H. hannoveriana. Separated from H. glabra by the orange-yellow lateral margins to the pronotum (not present in H. glabra). Separated from H. hannoveriana by the lack of a median elytral stripe (usually present in H. hannoveriana); in specimens of H. hannoveriana where this is absent, the aedeagus may need to be examined in - in H. hannoveriana, the tip has a slight angle near the tip (lateral view), in H. marginella, the tip is more-or-less straight or slightly curved (no angle).