en <span style=font-size:10pt><span style=unicode-bidi:embed><span new= roman= style=font-family: times=><b><span cambria= style=font-family:>Aims: </span></b><span cambria= style=font-family:>The aim of this study was determination the diversity of the aquatic Gastropoda species and to assess heavy metals in water, sediment, soft tissue, and shell <i>Melanoides tuberculata</i> by evaluating some of the physical and chemical factors for the river. </span></span></span></span><br> <span style=font-size:10pt><span style=unicode-bidi:embed><span new= roman= style=font-family: times=><b><span cambria= style=font-family:>Material & Methods: </span></b><span cambria= style=font-family:>The study was done during the Summer and Winter seasons and samples were collected from three study sites along the Euphrates river. The samples were analyzed using Atomic Absorption Spectroscopy for the detection of heavy metals. </span></span></span></span><br> <span style=font-size:10pt><span style=unicode-bidi:embed><span new= roman= style=font-family: times=><b><span cambria= style=font-family:>Findings:</span></b><span cambria= style=font-family:> The results revealed that <i>Melanoides tuberculate</i>, <i>Physella acuta</i>, <i>Pisidium dubium</i>, <i>Melanopsis nodosa,</i> and <i>Corbicula fluminea</i> were found in the studied station in both seasons with a high percent ratio (37.73, 20.27, 6.58, 8.42, 26.98%, respectively) in the summer season. Sediment has the highest mean concentration more than water. The heavy metals order was arranged as Zn<ni<pb<cd and= zn=>Melanoides tuberculate is higher than in shell and they were arranged as Pb<zn<ni<cd and= for= ni= soft= tissue=></zn<ni<cd></ni<pb<cd></span></span></span><br> <span style=font-size:10pt><span style=unicode-bidi:embed><span new= roman= style=font-family: times=><b><span cambria= style=font-family:>Conclusion: </span></b><span cambria= style=font-family:>Lead and Zink were higher and exceed the permissible level. <i>Melanoides tuberculate </i>could accumulate the heavy metals in their metals then it could use as a bio-indicator for these metals to detect the pollution in the Euphrates River. </span></span></span></span><br> </span> Gastropoda species, Melanoides tuberculate, heavy metals, bioindicator, sediment 247 253 http://hehp.modares.ac.ir/browse.php?a_code=A-1-70318-1&slc_lang=en&sid=4