EditorialDiscomedusae jellyfish: Linantha lunulata 1,2, Palephyra antiqua 3,4,5, Palephyra pelagica 6, Coronatae species 7, Nausithoe challengeri 8, and Wyville's crownjelly, Atolla wyvillei 9. Chromolithograph by Adolf Glitsch from an illustration by Ernst Hae...