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It is indeed rare, so any observations you may have about its habitat would be of value. As would a precise Lat/Long
The countries it has been recorded from (published articles only) are as follows:
Poland Muchowski, V., & Zatwarnicki, T. (2001).
Sweden Lund University museum collection
Norway Greve & Nielsen, 1991
Latvia Karpa, 2008
Romania Ceianu, I. (1989).
Finland Kahanpää, J., & Stuke, J.-H. (2014) (also in online key at http://www.elisan...ropezidae/)
Central European Russia Ozerov, 1987
Belgium Grootaert, 1991
Lithuania Bernotiene, R. (2006)

It's worth going back for more photographs and a specimen, I wish I could join you.