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Hi,
Could this be the species mentioned in the title of the subject?

Christian Widmann : Suisse : Lausanne : 1010 : 07/06/2020
Altitude : 632 m - Taille : 7.7 mm (corps)
Réf. : 259924
Click on the image to enlarge it.

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With this mosaic of tiny images I can only say:
Muscidae
not Hydrotaea
Please, large dorsal and lateral views, one by one

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Dear Nikita,
Thank you for taking a look at those images. If you click on the composite image, it should get much bigger and details can hopefully be seen better.
Anyways, I will upload more images as requested.
Regards,
Christian

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I tried to click, no result.
I can see that radial node setulose. Is it ventral side only or both sides?

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Radial node setulose on both sides
Try this link for larger images.
Also two additional images added.

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Side view

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"Radial node setulose on both sides"
Thus, Mydaea and you have the following choise

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Arista plumose, longest aristal hairs about width of flagellomere

-> not Mydaea anicula
-> not Mydaea obscurella

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Prealar < posterior notopleural
Fore femur without posterior seta

-> not Mydaea nebulosa

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I can also discard Mydaea nubila which is shorter than 7.7 mm and which also has darkened halteres

So it seems it is Mydaea ancilla. The mediotergite indeed appears shiny black and not pruinose (although I could not take a convincing pictures of this structure on my specimen as the wings were hiding it). Supporting criteria include:
- scutum with 4 very dark stripes
- posterior crossvein oblique
- prealar seta about 3/4 of posterior notopleural, although here pra is 85-91% of post nt (based on two measurements from different images)
- katepisternals 1 + 2
- fore tibia without posterior seta
- hind tibia with 2-3 anterodorsals and 2-3 anteroventrals