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Hi, I think theses may be larvae of Dixa sp. But I have very few books or pictures about them, so can be wrong easily:) Can anyone confirm?
Larvae found in a semi-thermal stream that usually does not freeze in winter and is full of introduced tropical aquarium weeds and also with Riccia water moss. At the edge of Bükk-mountains (where Dixa-s do occur) in Miskolc-Tapolca, April of 2007. Sorry for low quality.