Circulus (Mollusca-Gastropoda) species of the Turkish coasts with a note on the presence of Circulus octoliratus (Carpenter, 1856)

The present study is dealing with three Circulus species recorded along the Turkish coasts (İskenderun Bay, Levantine coast of Türkiye). Of identified species, novemcarinatus and octoliratus are non-indigenous originated outside Mediterranean Sea, whereas striatus a native one distributed in eastern Atlantic Ocean Sea. While was at depths between 9 60 m, were encountered shallow (5-11.7 respectively). Within some morphological distributional characteristics investigated described.