Last modified: Sept. 30, 2020, 10:11 a.m.
A very rare and local species in Belgium.
See also bladmineerders.be
The adults fly during June and July. They become active from dusk onwards and are easily disturbed by day from the food plant.
The larva lives on various species of Thymus and possibly also on Mentha. When young it makes a blotch mine, later it feeds between spun leaves.