EN
Recent samples of freshwater molluscs from Romania contained six new Bythinella species: B. blidariensis n. sp., B. georgievi n. sp., B. falniowskii n. sp., B. feheri n. sp., B. sirbui n. sp., and B. szarowskae n. sp. Since B. molcsanyi H. Wagner, 1941 sometimes co-occurred with B. grossui Falniowski, Szarowska et Sîrbu, 2009 or with B. feheri n. sp., differences between these species were studied, to identify diagnostic features. Apart from shell morphology, also the tubular gland proved to be important for identification of Bythinella spp.