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Let me write something about the key I prepared and published ij Dipteron-Wrocław.
The key was constructed to the Orbellia species hitherto known Russia.
One well known European species, O. myiopiformis wasn't included there...
I'm still working on the morphological differences between O. myiopiformis and O. nivicola (Both of it are closely related). If the specimen was collected, please contact me using PM to send it to me for further examination.
I have received next specimens of Orbellia from Chuvasia, which are similar to both mentioned species... Andrzej