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Andrius,

Welcome to the World of Platystomatidae, where there are many taxonomic problems. Hennig, W. 1945. Platystomidae. Die fliegen der Palaearktischen Region: 48: 1 - 56. is your best bet, although not ideal in some respects.

Platystoma seminationis (Fabricius, 1775) is correct.

I'm intrigued - what do have? Are there many specimens and is there a need for a revised key to the European species? I have been focusing on the tropical fauna, because there is so much more work required there.