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¹ Ege University, Fisheries Faculty, Department of Hydrobiology, 35100 Bornova, İzmir, Turkey DOI : 10.4194/1303-2712-v12_4_12 Viewed : 4429 - Downloaded : 4923 The taxonomical composition of epilithic diatoms was investigated at intertidal zone of Homa lagoon, Aegean sea, Turkey. The stations are located in different littoral zones of the study area and they are different from each other in terms of hydrological respect. The samples contained a mixture of forms growing on the stones themselves, on silt accumulated on the stones and forms epiphytic on other algae, I will refer to this collective community as epilithon. Epilithic diatom species, which constitute the majority of the community were examined from obtained material. A total of 67 diatom taxa belonging to 34 genera were identified to the genus or species level. The species more frequently found in the samples were Cocconeis placentula, Cocconeis scutellum, Mastogloia pumila, Navicula cincta and Navicula crypyocephala var. veneta. Nine of the species identified during the research period seem to be previously unreported for Turkish coastal waters. Morphological characteristics of these species were given in detail information and original photographs. Keywords : Epilithic diatom, species identification, Homa lagoon, Aegean Sea, Eastern Mediterranean Sea