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Andrey Ozerov, Black and me have just come back from 2 days trip in "Central Chernozemny Nat Res". It is 550 km south Moscow and it is a very rare site of undisturbed (never ploughed) wet step with oak forest in low places.
Nobody worked with Diptera fauna there so far.
Altougether we pined around 1000 of flies.
Image: step with Stipa pennata (Stipa joannis) and Salvia nutans.