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I presume you have doubt about the shape of the distiphallus (aedaegus, paraphallus), which seems a bit round….
All other components of the genitals seems to fit P. winthemi….
There seems no other palearctic species in which a mistake can be made, so I think the distiphallus could be mistaken by another part.
But.....having doubt in Anthomyiidae is very healty!
Keep this one as P. winthemi, with a little red flag and try to collect other specimen in the future, to compare with.

Johanna