Last modified: Jan. 5, 2020, 7:28 p.m.
A very rare species in Belgium.
The larvae live in a brownish black case of 7–8 mm. The mouth angle is 30°.
See also bladmineerders.be.
The caterpillar makes very small mines. Leaves with mines don’t change their colour and are falling rather quickly. Therefore the presence of the species is hardly noticeable. For the pupation the caterpillar spins a few leaves together.
The adults are on the wing from the end of June till the whole of August.
The species prefers Thymus.