Last modified: Oct. 2, 2020, 11:38 a.m.
A not so common species in Belgium. During the last two decades, the species is spreading. Probably underrecorded, because of the similarity to the related Caloptilia alchimiella.
Forewings reddish brown with a conspicuous yellow triangular spot at the middle of the costa. This spot is not prolonged towards the apex. Similar to Caloptilia alchimiella but in this species the triandular spot is prolonged towards the apex. For other differences with C. alchimiella see under that species.
The last instar constructs an oval, silken cocoon on the underside of a leaf; that cocoon is usually more yellowish than the one of Caloptilia alchimiella.
The first instars live in a short gallery at the underside of a leaf, becoming a blotch and later in 2 or 3 successive cones, rolled down at the top of a lobe. In contrast with Caloptilia alchimiella, this species has also a generation of larvae during May–June.
Hibernating in the pupal stage. The adults come to light.
The adults fly in several ill defined generations a year: from April till November.
This species seems to prefer somewhat more xerothermic localities than the related Caloptilia alchimiella.