Status: Widely scattered; not threatened by may be declining in part of its range.
Habitat: Various
Host plant: Ranunculaceae, especially Creeping and Meadow Buttercup.
Overwintering: Adults hibernate in tussocks.
Food: Leaves and petals of host plants, often leaving numerous holes.
Other notes: Similar to H. hannoveriana and H. marginella but without the yellowish lateral margin to the pronotum.

Status: Widespread, though not in Scotland.
Habitat: Various
Host plant: Various thistles - Cirsium, Carduum and Silybum.
Overwintering: Adults can be found throughout the year.
Food: Leaves of host plants; larvae usually remove only the upper epidermis.
Other notes: Superficially similar to several Oulema species, but the pronotum is constricted at the mid-point.

Status: Ireland only.
Habitat: Various, especially near water.
Host plant: Oats (Avena) and Bulrushes (Typha)
Overwintering: Unknown
Food: Host plants.
Other notes: Similar to O. obscura but separated by the more elongate elytra (1.30-1,45 times as long as wide, compared with 1.25 in O. obscura). Separation from O. erichsoni requires dissection; the lamella of the aedeagus is relatively elongate and somewhat pointed (though generally not sharply so) in O. erichsoni, but broad and blunt in O. septentrionis.

Status: Widespread and common
Habitat: Various
Host plant: Various, especially grasses and cereals.
Overwintering: Adults overwinter from September, in and under tussocks.
Food: Leaves of Poaceae
Other notes: Similar to O. erichsoni and O. septentrionis, but elytra less elongate (1.25 times as long as wide, compared with 1.30-1.45 in the other two species).

Status: Endangered (RDB1); recent records only from Somerset.
Habitat: Wet peat cuttings or trenches with little other vegetation; also heaths.
Host plant: Floating Sweet-grass (Glyceria fluitans); possibly other graases or cereals.
Overwintering: Unknown
Food: Upper epidermis of the host plant.
Other notes: Very similar to O. septentrionis, but front thoracic segment with a definite metallic reflection. Elytral punctures coarser overall, particularly towards the rear. Certain identification requires dissection; the lamella of the aedeagus in O. erichsoni is more elongate and somewhat more pointed compared with that of O. septentrionis which is broader and blunter. Also similar to O. obscura, but elytra more elongate (1.30 – 1.45 times as long as wide, compared to 1.25 in O. obscura).