Abstract
A review of the family Hydrobiidae from the Tarkhanian and Chokrakian deposits was made. New genus Islamiella was described, in which the species I. miocenica sp. nov. (upper Tarkhanian–lower Chokrakian) and I. maeotica sp. nov. (lower Maeotian) were included. Last species is widely distributed in the facies, concomitant with the bryozoan buildings of the Maeotian beginning. Peringia tarkhanica sp. nov. was described fom the Tarkhanian, whereas Hydrobia kubanica Zhizhchenko, 1936 was redescribed from the Chokrakian. Several species descibed earlier as Hydrobia by Zhizhchenko were synonymized with the species from the other families: H. subprotracta Zhizhchenko, 1936 icluded in synonymy of Finella andrusovi andrusovi (Bajarunas, 1910), and H. stavropoliana Zhizhchenko, 1936 reffered to the genus Odostomia, most probably to species O. nuda Bajarunas, 1910.