Last modified: Feb. 16, 2020, 2:44 p.m.
A rather common species throughout Belgium.
See also bladmineerders.be
The larva first mines the underside of a leaf of an aquatic plant. Later on it lives in a flat, oval case made of pieces of a leaf. It hibernates. Pupation in a cocoon covered with pieces of leaf, attached to the stem of a plant about 25 mm above water level.
The adults are active at dusk and later come to light.
There are probably two generations year which are difficult to separate: from the end of May till mid September. Most abundant in the second half of July and in August.
Polyphagous on aquatic plants. The main hostplant is Potamogeton sp., but the larva has also been recorded from a variety of other aquatic plants, even from very different plant families.
Different kinds of water parties: lakes, ponds, slow streaming rivers, marshes, etc.