Two species of Beroidae inhabit the Mediterranean Sea, according to identification by Chun (Chun, 1880): Beroe ovata Brown 1756 and Beroe forskalii Chun. Perrier (Perrier, 1936); Treguboff and Rose (Treguboff and Rose, 1957) have followed Chun (Chun, 1880) for species identification. Mills has mentioned also B. mitrada as an infrequent visitor in the Mediterranean (Mills, 2005). Beroe ovata and Beroe forskalii occur in the Gulf of Trieste, but we discus below validation of the Mediterranean Beroe ovata.