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Hi Jorge
This pretty "stratiomyiid" is actually Physiphora alceae (Ulidiidae). The wing venation is wrong for Stratiomyiidae.
The wing venation is also how to separate Hybotidae from Phoridae - but there are other, more easily seen characters. As a rule, the hind legs of Phoridae have very large femora. In Platypalpus it is the middle femora which are enlarged. Also most phorids have strong reclinate orbital bristles, giving them a characteristic head profile. So far there are only three phorid pictures in the gallery, but there are lots in the forum posts, so it's worth doing a search to familiarise yourself with them.