Pelagia noctiluca
Overview
Pelagia noctiluca is a jellyfish in the family Pelagiidae
Pelagiidae
Pelagiidae is a family of jellyfish. There are 15 species in this family.-Genera:*Chrysaora**Chrysaora achlyos Martin, Gershwin, Burnett, Cargo & Bloom 1997**Chrysaora africana **Chrysaora blossevillei Lesson 1830...

. In Latin, Pelagia means "of the sea", nocti stands for night and luca means light thus Pelagia noctiluca can be described as a marine organism with the ability to glow in the dark.

This species of jellyfish
Jellyfish
Jellyfish are free-swimming members of the phylum Cnidaria. Medusa is another word for jellyfish, and refers to any free-swimming jellyfish stages in the phylum Cnidaria...

 commonly known as the mauve stinger in Europe, amongst many other common names, is widely distributed in all warm and temperate waters of the world's oceans, including the Mediterranean Sea, Red Sea and Atlantic Ocean.
 
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