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I think we don't need to worry about overcollecting flies yet. Especially in Russia:p Perhaps at some old-growth forest sites in Western Europe, but not in Russia.

Your country may have many collecting fly taxonomists, but I doubt you have the highest number of collectors per sqare kilometer. :D How many million km? of Russia are there per dipterist to cover?

But back to business: I understood that separating the Temnostoma species discussed here may not always be quite as easy as the key claims. There is also a systematic difference between males and females in the colourations, so be careful and compare only males with males and females with females.