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Found on Apr 29, 2006, Naro-Fominsk, Moscow region.
Pretty big, size 6 to 7mm.
Could anyone go deeper than family? More images are available.

Thanks.

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Most likely the genus Dynatosoma.

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Moscow, park, on cut down wood, 29 apr, 6mm.
Thanks Paul and Dima. Two days ago I met same Mycetophilidae.
Now with Paul's prompting I went trought the key.
My result Dynatosoma nigromaculatum:
cx - black;
first antenae flagelomer - black.
There isn't Dynatosoma nigromaculatum in Netherlands..., neither in Diptera of Czech and Slovak, nor in synonims.
I misID, or there is some other synonim, or ID may be correct as Dynatosoma nigromaculatum is Eastern Europe species?
Nikita

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P.S. Only now I found that in case of Dima's Dynatosoma first antennae flagelomer is obviosly yellow, mine is obviosly black.

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From what the Palaearctic catalogue tells me, it may be a slightly more northern and continental species, but make sure to cross-check on D. abdominale. According to the German catalogue Peter Chandler thinks that is a senior synonym (and thus the name to be used).

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In my key there isn't D. abdominale. Search in Google show that in most cases Dynatosoma nigromaculatum (= abdominale).
Thank you Paul.

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Ugh, I nearly missed the whole case.
Thank you all so much. At my level, Dynatostoma sp. would be just fine...

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Jan ?evč?k from Univerzity Karlovy, Praha has confirmed that it's most probably a D. nigromaculatum.