Caloptilia alchimiella

    Alt Name
    Yellow-triangle Slender
    Description

    Wingspan 10 to13 mm. The adults are difficult to distinguish from the recently separated Caloptilia robustella, To be certain of identification, dissection of genitalia is necessary.  Where dissection has not taken place, records should be submitted as Caloptilia robustella - alchimiella agg.

    Similar Species

    Caloptilia robustella is very similar (see recording advice).

    Identification difficulty
    Recording advice

    To be certain of identification, dissection of genitalia is necessary.  Where dissection has not taken place, records should be submitted as Caloptilia robustella - alchimiella agg.

    Habitat

    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).

    Reference
    15.008 BF286

    Leicestershire & Rutland Map

    MAP KEY:

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

    UK Map