Caloptilia alchimiella

Alternative names
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

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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