Last modified: Nov. 10, 2019, 5:52 p.m.
C. ahenella is thought to be rare but in fact it is expanding its area and after 2004 it has been recorded from nearly all provinces.
This rather shiny Coleophora can have a forewing ground color varying from grey to brownish-black. The wingspan is 9–13 mm. The antennae are ringed with alternating white and dark brown till the tip.
The fully developed lobe case is about 7 mm long. The mouth angle is 0°.
See also bladmineerders.be.
The caterpillar makes a lot of small holes in one leaf. The case is gradually enlarged giving it a rough triangular view. The rings are cut out of the lower epidermis. The larva is fully developed in the autumn of the second year of its development. Hence, the larval stage lasts two years.
From the end of May and especially the whole of June.
The usual foodplant is Rhamnus cathartica but the species has also been found on Viburnum, Cornus, Lonicera, Betula, etc...
This Coleophora can be found nearly everywhere.