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Thanks a lot for your ID and compliment Gerard.
So I was right when I felt it's something worth collecting :).
By the way, it was an incredible day for collecting Syrphidae yesterday, maybe a bit too windy but warm and sunny, and all of them buzzing over flowers.
There were more interesting wasp-like hoverflies, but I missed them somehow focusing mostly on Tachinidae (and chasing shy Red Admirals, Vanessa atalanta).