Ectoedemia occultella

Wingspan 5 to 7 mm. The adults are quite large for a Nepticulid, and have blackish forewings with a hint of violet, and contrasting whitish fascia and eye-caps. The males have black heads, those of the female orange or yellow. The larva mines the leaves of Birch causing a rounded blotch with a darker centre.

Adult Leafmine

Anywhere that the host tree, birch is found.

There is a single generation, with adults at large from late May to July, and mines in evidence between August and October.

The larvae mine the leaves of birch, creating a distinctive mine which begins as a dark circular blotch, and is then extended into a larger pale blotch with a darker central circle. Sometimes several mines are found in one leaf.

Distributed commonly throughout mainland Britain, it is however local in Ireland. In the Butterfly Conservation's Microlepidoptera Report 2011 this species was classified as common.

Increasingly well recorded in Leicestershire and Rutland, usually from the leafmines on Birch.

http://www.leafmines.co.uk/html/Lepidoptera/E.occultella.htm

https://bladmineerders.nl/parasites/animalia/arthropoda/insecta/lepidoptera/monotrysia/nepticuloidea/nepticulidae/ectoedemia/ectoedemia-occultella/