A rather common species in Belgium.

The larva makes a leafmine usually on Rubus but also on Agrimonia, Fragaria, Filipendula, Geum and Potentilla. Usually a very long sinuous gallery with broken linear frass or if dispersed only one third of mine width. Grey-brown to greenish cocoon.

The adults fly probably in two generations a year: late April-May and July-August. The larvae of September-October are more numerous, so it's possible that there is only one generation with a minority of individuals emerging and reproducing ahead of the rest.

ID mine: there is a great overlap with mines between this species and Stigmella aurella, especially on Rubus and it's not easy to separate them. However there is a diagnose to give maximum chance for correct determination. In step-down order for S. splendidissimella; frass in second part of gallery maximum half of width, frass in first cm of gallery maximum half of width, mine makes in this first cm a curve, mine crosses regularly itself and mine cross rarely the midrib.