very rare species in Belgium, hitherto only known from the province of Liège.
strongly polyphagous greenish or reddish grey larva lives mainly on herbs as Achillea, Euphorbia, Linum, Potentilla, Rumex, Trifoliumetc... It
construct a case made of soil particles and feces
and the structure resembles a small snail about 3 or 4mm with
coloration similar to the attached underground. The larva remains
inside the case for the rest of its life. Mines can be recognised
because the feeding holes are not neatly circular and misses the fringe
of silken stalks around the margin because the case is not attached to
the leaf with spinning, unlike Coleophoridae do.
In Belgium only the pharthenogenetic form occurs and is only present as females. The
larvae can be found from late September till June.
Liège, Angleur, 17 January 2010.
overwintering bag on wall
(Photo © Jean-Yves Baugnée)