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These larvae 5-6 mm length have been found in the same 50 ml sample in filamentous algae of a freshwater pond
in Belgium (close to the Netherlands) . I found two larvae and I made the video clip with both organisms, alive.
One of both was full of blood and the other was quieter?
I also found a pupa which I supposed with your help it could be Clinocerinae Wiedemmania (previous post)
I know we cannot link larvae and pupae immediately, but perhaps here they are from the same species

Here is the video

YouTube Video















thanks to your attention and remarks
SDS

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New pictures of a fresher larvae
YouTube Video