Variegated Ground Beetle
Chlaenius variegatus
The Variegated Ground Beetle is a medium-sized beetle belonging to the Carabidae family. It is characterized by its metallic green coloration and distinctive yellowish margins on the elytra. This species is stenotopic, specifically tied to moist habitats such as riverbanks, lakeshores, and marshes. In Central Europe, it is considered rare and threatened due to the decline of natural wetlands.
Details
Identification
Metallic green pronotum and elytra; wide, yellowish to orange margins on the elytra; legs usually light-colored.
Social behavior
Solitary, but often found in high densities on shores under favorable conditions.
Diet
Predatory lifestyle; feeds on small invertebrates such as insect larvae, worms, and small mollusks.
Hunting strategy
Active visual hunter on the ground, particularly active during sunshine.
Spawning substrate
Moist soil or mud near shorelines.
Overwintering
Overwinters as an adult (imago) in the soil or under moss.
Ecology
Ecological role
Important predator in the soil fauna of riparian ecosystems; contributes to the regulation of insect populations.
Natural predators
Birds, amphibians, and larger predatory insects.
Competitor species
Other predatory ground beetle species of the riparian zone (e.g., genus Bembidion).
Ecosystem service
Pest regulation in wetland habitats.
Threats
Destruction of riparian habitats due to structural engineering, drainage of wetlands, and use of pesticides.
Scientific profile
Profile
Distinguishing features
The species belongs to the subgenus Chlaeniellus. It is characterized by dense, fine pubescence on the elytra, typical for the genus Chlaenius. The yellow lateral margin of the elytra is sharply defined. Legs and the base of the antennae are usually light yellowish-red.
Habitat
Stenotopic hygrophilous species. It inhabits muddy, sparsely vegetated shores of standing or slow-flowing waters, oxbow lakes, reed beds, and seasonally flooded wet meadows. Often found on clayey or fine sandy substrates.