Hydroscapha granulum(Motschulsky, 1855) description of the larva and ecological notes

Abstract
The most northern Eurasian occurrence of Hydroscapha granulum in the Lower Ardèche River (France) is discussed. After a systematical, biogeographical and ecological review, the larva is described and compared to the only previously known larva of//, natans which was found in North America. H. granulum is a rheophilic species, which lives in sandy and cobble substrate and is sensitive to organic pollution.