This is a pest of different species of Mason bee (Osmia) in Europe. I am sure there are other species of Chaetodactylidae in Europe, but for the time being I found only this one.
I made a photo in light microscopy of the whole acari, a detail of the dorsal cuticule, and a detail of the attachement zone.
I would be very interested in other exemples of Chaetodactylidae to compare the morphology, Chaetotaxy and fine details of cuticle. If you get some, let me know !