Abstract
Our research revealed 20 species of Bivalvia, 1 subspecies and 1 variety of the Sangzor River and its surrounding aquatic species belonging to 4 families and 5 genera. Of the species listed in the table: Euglesa hissarica, E. (Casertiana) obliquata, Odhneripisidium polytimeticum are more numerous. They are found in the amount of 1-4 m per 1 m2. The rest of the species are relatively rare. Euglesa (Cyclocalyx) gurvichi, Odhneripisidium terekense, O. (Kuiperipisidium) issykkulense were first discovered in the basin of the Sangzor river. These Bivalves are crenophils and pelolimnophils living in springs depending on their habitat. The length of the Sangzor River and the presence of all biotopes in which mollusks live, made the river a favorable habitat for mollusks. However, it should be noted that while all species occur in the river, they vary in density.
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