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Dear Obonaj
This larva is a difficult case. Although the larva resembles a Zavrelimyia (and Paramerina), for it has an additional extension at the innerside of one of the claws on the posterior parapods, the habitat doesn't quit fit. As far as we can tell, there has been no record of any Tanypodinae in a tree. Besides that Zavrelimyia is genus known to occur in flowing surface waters (brooks, springs, lowlandrivers) and Paramerina in smaller, standing waterbodies. None of them known to occur in trees. So this may be an interesting specimen. You better ask some specialists on this matter. I have asked a dutchmen (H. Vallenduuk) who previously wrote a book on Dutch Tanypodinae larva, but he didn't knew the species either. He told me that Peter Langton is the best men to ask.