The wingspan is 4.6–6 mm.A small, dark moth. The head is covered with yellow, hair-like scales, the enlarged first antennae joint and the collar are white. The body and forewing are blackish-brown, the forewing has a cream-coloured transverse band in the middle that is narrower in the middle. The hind wing is grey. The larva is yellow. Meyrick - The head is orange, the collar yellow-white. Antennal eyecaps yellow-white. Forewings are coarse, dark brown basal to the yellowish cross fascia, apex black. Hindwings grey.[1][2][3][4]
The morphology of the genitalia must be examined for certain determination.
Adults are on wing from April to May and again in August.
Life cycle
Eggs
Laid on either side of a leaf of one of the smooth-leaved willows in May–June or August–September.[5]
Larva
The larva is amber-yellow with a brown head and has a faint chain of pear-shaped dark ventral spots.[6]
^ Zagulajev, A.K., 1987 Nepticulidae (Stigmellidae); 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
^Emmet, A M (1983). Heath, John (ed.). The Moths and Butterflies of Great Britain and Ireland. Volume 1. Colchester: Harley Books. p. 229. ISBN0-946589-15-1.