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OK, I will not name this to species than. In fact putting this fly to the genus was the least sure decision. I could not rely on the numbers of setae, because they are not visible (they must be yellow, otherwise they would not be visible.)

I tried to rely on two characters, the shape of the eye, which is not very well visible, but I assumed it is oval, rather than circular. And the size of this fly was clearly under 2 mm, in fact I think it was less than 1.5 mm (I do not know whether the wings count, I just assume that the length is from head to abdomen. Both these characters hinted G. rather than C.

Finally the brown ocellar triangles seemed to match G. inermis. All C. images that I could find had yellow ocellar triangles, though I could not find any info of this feature on C. species.