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Interesting find!

Don't know if that feature is of good use in freshly emerged specimen as well, but the fore coxa in D. repleta is darker than the rest of the leg - here it is the same color.
There is, however, one caveat: According to Bächli, D. mercatorum should not have a darkend costal spot. Apart from D. repleta, the other species recorded in Europe with that feature is D. buzzatii - and that species has light front coxae, and is described to have a small dark band at the base of the tarsus - I think I might spot a faint ring in some of the photos where the leg is visible...