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I agree with the option of being it a Nephrotoma. Although this is more of a terrestrial genus, but maybe it is washed with the moss growing on the banks? Looking at the drawings in Theowald (1967) it may also be a T. (Oreomyza) spec. which resembles Nephrotoma larvae. You have to check the presence or absence of a thickened ridge along the anterior margin of the prothorax. But also this subgenus is not amphibious.