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• Although A. maculata is previously unknown in both İzmir Bay (north-eastern Aegean Sea) and Turkish seas, the occurrence of A. maculata in İzmir Bay was not unexpected, but it did not clearly indicate an established population. In conclusion, this short report contributes a new mollusc species to the Turkish marine fauna. Acknowledgements We are thankful to Dr Bilal Öztürk and Dr Baki Yokeş for their comments and identification of the species.