Status: Common and widespread.
Habitat: Various
Host plant: Various Brassicaceae, including Water-cress; sometimes on flowering gorse.
Overwintering: Adults hibernate from October to April.
Food: Leaves of host plants (adults may also feed on gorse pollen).
Other notes: Similar to C. armoraciae, but without the basal elytral impression along stria 5. It can also be confused with the rare metallic blue form of P. concinnus. However, in P. concinnus, the antennae are entirely black; in P. cochleariae, the underside of the 2nd & 3rd antennal segments are reddish (or at least with a reddish spot).

Status: Common and widespread.
Habitat: Various, especially near water, but also a range of drier locations.
Host plant: Various water plants
Overwintering: Adults hibernate from December to April.
Food: Leaves of host plants (larvae possibly only on Brooklime).
Other notes: Similar to P. cochleariae, but has elytra with a short longitudinal impression along the basal part of the 5th stria (not present in P. cochleariae).

Status: Believed to be extinct in Britain; last recorded in 1895.
Habitat: Caledonian pine and birch woodland, also calcareous grassland. Associated with various ant species.
Host plant: In continental Europe, various trees (including roses), especially willows and poplars.
Overwintering: Unknown
Food: Adults feed on leaves and flowers of host plants.
Other notes: Considered extinct in Britain. Separated from C. quadripunctata by having pronotal side margins smooth and narrow (not flattened and punctured as in C. quadripunctata).

Status: Endangered (RDB1), last recorded in southern England in the 1950s.
Habitat: Woodlands/forests (especially rough open ground within them).
Host plant: Various, mainly birches
Overwintering: Unknown
Food: Adults feed on birch leaves (especially 5-year old saplings); young larvae feed on algae on tree bark.
Other notes: Males have larger heads and longer front legs than females. A fairly large and distinctive species last recorded in Britain in the 1950s, this would be a great rediscovery (it is widespread elsewhere in Europe and across the Palaearctic). Possibly has some association with ants, although the larvae do not live in the nests.

Status: Common and widespread.
Habitat: Various
Host plant: Various, but usually Knotgrass (Polygonum aviculare)
Overwintering: Adults overwinter and have been recorded every month except December.
Food: Leaves of host plants.