Identification and Classification of Bivalvia in Northwestern of the Persian Gulf costal water (frome Deylam to Bahmanshir river

This Study was carried out during 1 years study from August 2013 to February 2014 in costal water in North west of the Persian Gulf. Sampeling was done seasonally from 14 stations in Deylam costal to Bahmanshir River. That eventually 64 bivalvia species from 24 families in costal water of Persian Gulf Which identified and classified, they are as below:Nuculidae, Yoldiinae, Donacidae, Semelidae, Tellinidae, Psammobiidae, Solecurtidae, Galeommatidae, Kellidae, Veneridae, Mactridae, Lucinidea, Trapeziinae, Cardiidae, Carditidae, Thracioidea, Periplomatidae, Solenidae, Corbiculidae, Arcidae, Mytilidae, Spondylidae, Placuna placenta, Pteriidae, Ostreidae, Veneridae family with 26%, Mactridae family with 22% and Tellinidae family with 21% are upper abundance in total bivalve’s family.