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Hi Jorge,

I have to admit that it is difficult for me to tell you why I would call this specimen a sepsid. It is just that I have seen a lot of sepsids, so call it "experience". As to why I think it is not a platystomatid, I can only tell you that according to me the species of the genus Platystoma look totally different. The only other European genus is Rivellia of which only two species are known from Europe (i.e. syngenesiae and hispanica). R. syngenesiae has very different wing markings. I don't know R. hispanica, but if it looks a bit like syngenesiae, then it's certainly not the species you show here!
Although it is probably correct, I may have been a bit hasty with calling your specimen Sepsis sp.. There are other genera with similar wing markings if I remember correctly.

Jan Willem