Miocene Hydrobiidae (Gastropoda) of the Eastern Paratethys

The family Hydrobiidae from Tarkhanian and Chokrakian deposits is reviewed. A new genus, Islamiella , is described, and the species I. miocenica sp. nov. (Upper Tarkhanian–Lower Chokrakian) and I. maeotica sp. nov. (Lower Maeotian) are included in this genus. The latter species is widespread in facies accompanying the bryozoan buildups of the Early Maeotian. The species Peringia tarkhanica sp. nov. is described from the Tarkhanian, and Hydrobia kubanica Zhizhchenko, 1936 was redescribed from the Chokrakian. Several species previously assigned to the genus Hydrobia by Zhizhchenko are synonymized with species from other families: H. subprotracta Zhizhchenko, 1936 is synonymized with Finella andrusovi andrusovi (Bajarunas, 1910) and H. stavropoliana Zhizhchenko, 1936 is transferred to the genus Odostomia , where it is most likely a synonym of O. nuda Bajarunas, 1910.