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Thanks sooo much for your reply, Ian!! :) Yes, it helps a lot because I had no idea the arista was important and didn't pay attetion to it when selecting pictures :(

I have been checking pictures and there is one where I can see 'clearly' (just a way to say that I can see something :D) that there are hairs on the arista. I have put an arrow to show the area where I can see them. It is against the pale background.

Does this help to suggest another possible genus? I am really interested in this one as I hardly ever find Lonchaeidae :(