Purple jellyfish | ©Frédéric Lechat (Belle-Île, France)
Pelagia noctiluca (Semaeostomeae - Pelagiidae) is a jellyfish found in the Northeastern Atlantic, Mediterranean, Indian Ocean, and western and central Pacific. Sometimes it is commonly named Mauve stinger.
These jellyfishes are beautiful, especially when they phosphoresce. The Mauve stinger glows by producing luminous mucus from surface cells when it is knocked or disturbed by waves.
Unlike most jellyfish, the life cycle of the mauve stinger does not involve a fixed stage.