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Here is a photo from Stéphane Brule in French Guiana. Could anyone confirm whether I have guessed the correct family ... and possibly add any more information?

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I'd say some kind of Microdon sp.

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Yes, I am hoping that Menno Reemer will have a look at it

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Well, and I am hoping that Stephane Brule collected the specimen...
It's a Microdon (s.l.) indeed, from a species group restricted to the neotropics. I am reasonably sure (but not entirely) that this is an undescribed species. I would certainly like to see more pictures, or even better: the real specimen!

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I will chat with Stéphane and ask him if he has a specimen