K.K. Al-khafaji K.D. Saoud Department of Marine Biology, Marine Science Centre, University of Basrah, Iraq Arthropods ISSN 2224-4255 http://www.iaees.org/publications/journals/arthropods/online-version.asp 2018 7 4 87 93 International Academy of Ecology and Environmental Sciences Hong Kong 19 September 2018 26 September 2018 1 December 2018 Shatt Al-Arab River intertidal zone seasarmid crabs Samples were collected monthly from intertidal zone of Shatt Al-Arab River at three stations by using the quadrate (25 by 25 cm), three species of a sesarmid crabs were collected monthly from intertidal zone Shatt Al-Arab River. Occurrence of these Sesarmid crabs were studied duringthe period from January to December 2017. A total of 17678 specimens for three species of seasarmid crabs; Chiromantes (Sesarma) boulengeri with density 10-40 individuals/m^2 in Ashar station and 44-140 individuals/m^2 in Sebia station then Parasesarma plicatum with density 226-990 individuals/m^2 in FAO station and 0-52 individuals/m^2 in Sebia station followed by Nanosesarma sarii with density 256-1248 individuals/m^2 in FAO station and 0-44 individuals/m^2 in Sebia station. During this survey, 8 species of the other crabs were observed, including Ucas edenisus, Leptochryseus kuwaitensis, Opusia indica, Nasima dotilliformis, Macropthelmus dentipes, Macrophthalmus depresus, Eurycarcinus orientalis, and Eriocheir sinensis, belonging to the five families. http://www.iaees.org/publications/journals/arthropods/articles/2018-7(4)/occurrence-and-density-of-sesarmid-and-brachyuran-crabs.pdf