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I think this is a male Notiphila, which is very common in the stream behind my garden, despite not really having any reeds in the vicinity. I assume, these will breed not only attached to reed, but also to Iris pseudacorus or any other water plant as well.

I tried to key out this using Fauna Hungariae key by Papp.

It quite well keys out to the Notiphila cinerea group, which is no longer identifiable without genital ids. I cannot entirely rule out the Notiphila riparia group though.


Other images can be seen here: https://www.izeltlabuak.hu/talalat/193153

Can Notiphila cinerea group be used to label this fly, or better leave it as Notiphila sp?