A taxonomic revision of the snails from the northern Black Sea coastal region previously assigned to the genus Belgrandiella A.J. Wagner 1928 (Hydrobiidae) is presented. As shown anatomically, these mollusks can be classified neither in Belgrandiella nor any other conchologically similar genera of hydrobiids (Pontobelgrandiella Radoman 1978; Agrafia Szarowska et Falniowski 2011). In consequence, a new genus, Tschernomorica gen. n., is established. It encompassed five species: T. kimmeria sp. n. (the type species), T. adsharica (Lindholm 1913), T. caucasica (Starobogatov 1962), T. inconspicua sp. n., and T. lindholmi sp. n. The range of the new genus covers the Crimean Peninsula and the Caucasian part of the Black Sea coast. Brief accounts of all five species of Tschernomorica gen. n. are provided, with a key given for their identification on the basis of anatomical and conchological traits.