A common species in Belgium.

The larva makes a leafmine on Carpinus betulus and Corylus avellana. The mine differs a little bit on both food plants; in Carpinus the mine has a strong tendency to follow the veins, frass is a little bit diffuser and in generall it's shorter and a little bit wider. In Corylus the mine hasn't a strong tendency to follow the veins, it's longer and frass is narrow linear. It pupates in a cocoon spun on detritus.

The adults fly in two generations a year: late April-May and July-August. 

ID mine: a narrow mine, not wider than larva, often very long and angular and frass usually narrow linear. The mines of Stigmella floslactella are sometimes very similar, but in this species the frass in the early mine is broad and fills almost or completely the whole width of the gallery. In S. microtheriella the frass is narrow linear leaving clear margins.