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Hi,
Three weeks ago I saw a small black fly running on the wet algae washed ashore at the Baltic coast. I am sorry the pictures are bad quality, but I would like to show them nevertheless, because I have no idea where to place this fly. It has two strange "brushes" that meet at the abdomen tip, a structure I have not seen before. Help is greatly appreciated!
Thanks in advance, Sundew

This is the habitus: