marine research site Perseus painful sting Pelagia noctiluca site van PERSEUS Jellyfish Spotting Pelagia noctiluca Pelagia noctiluca Pelagia noctiluca Pelagia noctiluca Pelagia noctiluca Pelagia noctiluca είδη http://www.perseus-net.eu/en/species_of_jellyfish/index.html