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ABSTRACT
The gastropod mollusc fauna of the North Aegean Sea was investigated during the last 20 years. Examination of the material collected from that area revealed the presence of 279 prosobranch mollusc species. One hundred of them are new records for the mollusc fauna of the North Aegean Sea, 9 for the Aegean Sea and 10 for the Eastern Mediterranean. An updated checklist of the Aegean prosobranch molluscs including 420 species is presented for the first time. All the six prosobranch orders living in the Mediterranean were found to be represented in the Aegean. A zoogeographical analysis of the Aegean prosobranch mollusc fauna showed that the bulk of the species are Atlanto—Mediterranean, followed by Mediterranean endemics and Boreal. Only 5 of the Mediterranean species of Indo-Pacific origin have been found in the Aegean, mostly in the southern part. A comparison of the Aegean prosobranch fauna with those of the other Mediterranean areas, showed that the number of species in the Aegean is higher than in any other Mediterranean area except the western basin.