Individuals which we observed in the northern Adriatic had a ratio 1.3+0.03 (Table II), similar to the non-native species B. ovata from the Black Sea that have a length to width (l/w) ratio of 1.2+0.1 (Table III). From the measurements of individuals from the Black Sea (Fig. 3G and J) (Seravin et al., 2002) the length of the B. ovata body does not exceed 1.5 times its width; therefore, our individuals from the northern Adriatic have all the features consistent with those of the nonnative B. ovata.