Medusafish
Medusafishes are a family, Centrolophidae, of perciform fishes. The family includes about 31 species. They are found in temperate and tropical waters throughout the world.
Young Icichthys lockingtoni specimens are abundant in the coastal waters of the north Pacific, where they are often found in association with jellyfish, which provide them with protection from predators and opportunities to scavenge the remains of the jellyfishes' meals.
Timeline of genera
References
Froese, Rainer, and Daniel Pauly, eds. (2006). "Centrolophidae" in FishBase. February 2006 version.
Sepkoski, Jack (2002). "A compendium of fossil marine animal genera". Bulletins of American Paleontology 364: 560. Retrieved 2011-05-19.