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This is very likely a Syrphid from the genus Palaeoascia. This is one of the most common genera found in Baltic amber. There are several fossils described in modern genera, but this is often by superficial similarity and most species from Baltic amber should be placed in non-modern, e.g. new genera. The Syrphid fauna from this time was very different from the modern, and the climate was very different. There are a lot of connections between the Baltic amber fauna and the modern African fauna...
Cheers
Martin