The shells have an oval-triangular shape with thin and closely spaced rings; shell length in
most cases is larger than shell height (Figure 1).The lock presented in Figure 4 is identical to the
original figure “the lock of Corbicula fluminea (Müller)” presented in Zhadin (1952). Taking
into consideration these diagnostic peculiarities we assumed that the mussels collected in the Prut
River were Corbicula fluminea (Müller, 1774).