The first specimen for our country was determined by checking the genitals and on the basis of DNA analysis.
The occurrence of S. svenssoni is largely unknown, both the appearance of the adults and the feeding signs have little external features and are practically indistinguishable from other oak-mining Stigmella's.

The egg is deposited on the leaf underside.

The larva is yellow and can be found mining in August.

The mines on Quercus show variation that overlaps with mines of other Stigmella species.
It is a remarkably long not very slender corridor. The frass is scattered in the mine, varying in width, predominantly occupying more than half the corridor width.

The adults come to light.

The larva mines on Quercus robur and Quercus petraea