Elmis aenea

    Description

    A very small (2 mm) riffle beetle that is equipped with strong claws to enable it to grip in strong currents. It is a dark coloured species with very deeply ridged elytra.

    Identification difficulty
    Habitat

    It is a water beetle of running water, but cannot swim and lives amongst stones, moss and algae.

    When to see it

    Late summer and autumn are the peak time.

    Life History

    It does not need to surface for air as it breathes the trapped oxygen in submerged bubbles but it does leave the water at times and can fly.

    UK Status

    Widespread and common in Britain.

    VC55 Status

    Quite common in Leicestershire and Rutland. There were a total of 129 VC55 records for this species up to March 2015.

    Leicestershire & Rutland Map

    UK Map