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With those black and white Anthomyia species there is mostly one option for a proper ID.......looking at the genitalia.
For an idea how difficult the differents could be you can look at this page (http://www.anthom...omyia.html) where you can see the small differents in A.procellaris and A. quinquemaculata.....mainly the pre-and postgoniten are different in shape.
The same for A.imbrida :)

Johanna