Beroe ovata sensu Mayer, 1912 individuals (Fig. 3E and F) were also observed in autumn 2005, which are most probably non-native for the Mediterranean Sea. These individuals could originate from the Black Sea and, likewise, as with M. leidyi could be released with ballast water. The body of non-native Beroe ovata is mittenshaped, wider at the oral end and not tapered at the aboral end (Fig. 3E and F, Tables II and III).