Abstract
This investigation of molluscs was carried out at some sites on the river of the Euphrates. Samples of molluscs were collected monthly from June 2019 to November 2019. Fourteen species were investigated which belonged to two Classes: Bivalvia (three species) and Gastropoda (eleven species). The species Corbicula fluminalis, Pisidium dubium, Melanoides tuberculata, Physa acuta, Gyraulus convexiusculus, and Gyraulus intermixtus seemed in all sites. According to the index of Shanon-Weiner, species diversity ranged from 0.5 to 2.5 bits/individual. Index of Jaccard's similarity showed that the highest similarity was recorded between site one and site two with 60 %.
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