Mystacides nigra


    Length 7 to 10 mm. The adult is about 6 to 9 mm long and has matt looking black wings which have a characteristic fold at the distal extremity, making the rear of the wing look very angular when viewed fom above. They are called 'longhorn' because of their antennae which are threadlike and extremely long, approximately twice the length of the body. The males have distinctly larger eyes than the females and have distinctive large and hairy maxillary palps used in mating.

    Similar Species

    Mystacides azurea - blue tinged wings

    Identification difficulty

    Streams, rivers, canals and lakes.

    When to see it

    May to September.

    Life History

    Caddis flies don't feed as adults and the labial palps (the 'jaws') are modified to act as sensory organs.

    UK Status

    Local but widespread in Britain

    VC55 Status

    Not particularly common in Leicestershire and Rutland.

    Leicestershire & Rutland Map

    MAP KEY:

    Yellow squares = NBN records (all known data)
    Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

    UK Map