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Dear Kathrin
In my opinion this larva would be Odontomyia ornata, but Í do not know were it is from? (which country?). As far as I can tell, most stratiomyids emerge around May-June, around the period you collected it. So if it didn't emerged yet, it will probably die, due to either lack of food, lack of substrate (filamentous algae) or something else. The new generation will hibernate as larva. I'm very unsuccesfull in breeding the aquatic stratiomyd larva, so I cannot tell you the ideal situation for breeding. My best guess is that, if you keep it in a box in the basement, and the larva emerges (it has no pupalstage) you're a lucky :@