Cloeon dipterum

    Alternative names
    Cloeon cognatum

    Length: 5 to 7 mm; wingspan: 13 to 25mm. A reddish brown mayfly. The compound eyes of C. dipterum show a striking sexual dimorphism, whereby females have lateral apposition eyes, while the males' eyes have additional dorsal "turban-shaped" parts that function as superposition eyes. These extra eyes are thought to enable the males to locate isolated females in the mating swarm.


    Around ponds and favouring small ponds.

    When to see it

    May to October

    Life History

    The larvae feed on algae and detritus in ponds, the adults do not feed at all.

    UK Status

    A common and widespread species in Britain

    VC55 Status

    Common in Leicestershire and Rutland.

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    Leicestershire & Rutland Map

    MAP KEY:

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

    UK Map