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This is indeed Trichoceridae, Trichocera (Metatrichocera) forcipula Nielsen, 1920. It was known from Slovakia from the publication of J.Starý: Starý, J. 1997. Trichoceridae. In Chvala, M. (Ed.): Check list of Diptera (Insecta) of the Czech and Slovak Republics. Karolinum - Charles University Press, Prague p. 11.