Caloptilia alchimiella

    Alt Name
    Yellow-triangle Slender

    Wingspan 10 to13 mm. The adults are difficult to distinguish from the recently separated C. robustella, so care must be taken. When an image appears in a red box it is likely to be this species, but no detailed examination has taken place to confirm the identification, so it can only be said to be typical of the species.

    Similar Species

    Caloptilia robustella is very similar but the yellow triangle does not extend as far along the costa.

    Identification difficulty

    Areas where oak is present.

    When to see it

    The flight period is from May to July, and the moths can sometimes be attracted to light.

    Life History

    The eggs of this species are laid on the leaves of oak (Quercus). When hatched, the larva at first mines the leaves in a gallery leading to a blotch. Subsequently the larva forms a succession of cones (usually three) by folding the tips of the leaves, and feeding within.

    UK Status

    Seems to be widespread in Britain. In the Butterfly Conservation's Microlepidoptera Report 2011 this species was classified as common.

    VC55 Status

    Occasional in Leicestershire and Rutland. L&R Moth Group status = C (very scarce resident or rare migrant).

    15.008 BF286

    Leicestershire & Rutland Map

    Map key:

    Yellow squares = NBN records (all known data)
    Coloured circles = NatureSpot records:

    • RED = 2020+
    • DARK BLUE = 2015-2019
    • LIGHT BLUE = pre 2015

    UK Map