Last modified: Feb. 25, 2021, 3:29 p.m.
A very rare species in Belgium, possibly overlooked because of the difficulty of the genus.
Wingspan male 12–14 mm. Males have wings, females are apterous.
Lenght 5–7 mm, covered with fine grains of sand. Like all species of the genus Dahlica, the case is a three-sided crosssection with one vertex and the sides are situated laterally in the lower part. Each species features its specific bag, but there are sometimes difficult to tell apart.
The adults males come to light.
The adults emerge in early spring, from March till early May.
The larva lives on algae, moss and lichens on tree trunks, wooden fences, walls and rocks.