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Hi Jan.
I have news.
First fly was collected in 3-4m from my countryhouse. Taday I collected 3 more in 3 km from house under my "Medetera tree". 2 of them became to copulate inside my exgauster and did it according all Geomyza species I so far observed during good 60 min. So we have both sexes of same species at least.
I'll write again after I pin them and look under microscop.
Nikita