Pelagia noctiluca, the mauve stinger (family Pelagiidae), is a cosmopolitan scyphozoan jellyfish distributed throughout tropical and temperate oceans worldwide, known for its striking bioluminescence and potent sting causing severe dermatitis in swimmers. Unlike most scyphozoans, it lacks a benthic polyp stage entirely, completing its life cycle as a holoplanktonic organism with direct development from planula to juvenile medusa. The species forms extensive blooms in the Mediterranean Sea and Atlantic Ocean that cause significant economic damage to coastal tourism and aquaculture. A genome assembly has been produced for P.