“…Besides, there are several endemic species in the collection which were deposited as holotype or paratype materials including Theodoxus gloerii The majority of taxa obtained from the scientific studies carried out in the streams of Northern Aegean Basin (e.g. Odabaşı, et al, 2013;Odabaşı & Georgiev, 2014;Odabaşı, et al, 2015;Odabaşı & Arslan, 2015a;Odabaşı & Arslan, 2015b;Odabaşı & Odabaşı, 2017;Odabaşı, et al, 2019a;Odabaşı, et al, 2019b;Odabaşı, et al, 2020;Bal, et al, 2021), whereas several materials are transferred from the domestic or foreign museums (e.g. Bithynia tentaculata (Linnaeus, 1758), Bythinella charpentieri (J. R. Roth, 1855), Theodoxus anatolicus (Récluz, 1841), Melanopsis costata (Olivier, 1804) etc.)…”