
Oxyethira flavicornis - Long antennae
The long antennae on this one presumably would be aberrant. The normal length is like the specimen in the image below:
For (Dutch) discussion see:
https://forum.waarneming.nl/smf/index.php?topic=456129.0

Oxyethira flavicornis is a small Caddisfly (Trichoptera) in the family Hydroptilidae, known from large parts of Europe
Similar species: Caddisflies