Last modified: March 20, 2021, 3:51 p.m.
A very rare species in the southern part of Belgium.
This species constructs a relatively large, dark brown, slightly curved and two-valved case that has a narrow ventral keel and can reach a length of about 12–15 mm. The mouth angle is 30–45°.
See also bladmineerders.be.
The eggs are deposited on the leafs of the food plant. The caterpillars make small mines on both sides of the leaves and are full grown in May.
The adults mainly fly in July.