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it is a larva of a Chironomidae (subfamily Tanypodinae) in the prepupal stage. For an identification to genus or species level, you need to study the larva in more detail, especially the head and the anal claws. As it is in the prepupal stage the thoracic horn in the thickened thorax can be studied as well for a positive identification. It is impossible to tell which genus/species. Try adding a photo of the thoracic horn, a detailed photo of the head or the anal claws, or else you can send the larva to me and I will try.