Bathyal gastropod (Mollusca) species from the Turkish Levantine and Aegean Seas

This study assigns 35 gastropod specimens and 23 shells collected from two sites on the Turkish Levantine and Aegean coasts at depths of 432 and 702 m, respectively, to 13 species. Among the species identified, Alvania subsoluta (Aradas, 1847), Protatlanta souleyeti (Smith, 1888), Pagodula echinata (Kiener, 1839), Pleurotomella gibbera Bouchet & Warén, 1980, Ringicula gianninii Nordsieck, 1974 and Diaphana marshalli (Sykes, 1904) are new records for the Turkish molluscan fauna; Anatoma aspera (Philippi, 1844) and Acteon monterosatoi Dautzenberg, 1889 are new records for the Levantine coast of Türkiye; and Crenilabium exile (Jeffreys, 1870) is a new record for the Turkish Aegean coast. Of the 13 species identified, nine species were found at a depth of 432 m on the Levantine coast of Türkiye, while four species were found at a depth of 702 m on the Turkish Aegean coast. A fresh shell of the holoplanktonic species Protatlanta souleyeti was found in the sampled benthic material. This paper comments on the identified species and provides information on their nomenclature, ecology, and distribution.