The wingspan is 5–7 mm. The head is dark bronzy. The forewings are dark greyish-bronze with a white dorsal spot towards base, and another beyond middle. The hindwings are rather dark brassy grey.[2][3][4][5][6][7]
Adults are on wing from late May to July in one generation per year.[8]
The larvae feed on Alnus glutinosa, Alnus glutinosa x incana and Alnus incana. They mine the leaves of their host plant.[9] Larvae can be found from June and July to October. When full-grown, they cut out an oval case, in which they descend to the ground to pupate.
^Meyrick, E., 1895 A Handbook of British Lepidoptera MacMillan, London pdf This article incorporates text from this source, which is in the public domain. Keys and description
^Langmaid, J. R., Palmer, S. M. & Young, M. R. [eds]. 2018 A Field Guide to the Smaller Moths of Great Britain and Ireland [3rd ed.]Reading, Berkshire. British Entomological and Natural History Society
^Sterling, P. and Parsons, M. 2012 Field Guide to the Micro Moths of Great Britain and Ireland Dorset British Wildlife Publishing, 2012
ISBN 10: 0956490212 / ISBN 13: 9780956490216 - 2nd edition (Bloomsbury Wildlife Guides)
^Kuznetsov, V.I.' 1987 Heliozelidae; in G.S. Medvedev (ed.): Keys to the insects of the europaean part of the USSR, Vol.IV: Lepidoptera, part 1 (english translation), Oxonian Press Pvt.Ltd., New Dehli, 1987