The scyphomedusa Rhopilema nomadica, recorded in July 2006 from Lakonikos Gulf, on the Ionian coast of Greece, is a Lessepsian alien established in the Levantine Sea. The jellyfish’s painful stings may pose a danger to swimmers. Because of its invasiveness and its impact it is considered among the worst invasive marine species in European Seas.
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Ioanna Siokou-Frangou (2006) studied this question.
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