"Do jellyfish light up?"

"Luminescent species are found among marine and terrestrial bacteria, annelids or segmented worms (e.g., fireworms), beetles (e.g., fireflies, click beetles, railroad worms), algae (e.g., dinoflagellates), crustaceans (e.g., shrimp, ostracod), mollusks (e.g., squid, clams, limpets), coelenterates (e.g., jellyfish, sea pansies, hydroids), bony fish (e.g., hatchet fish, flashlight fish, pony fish), and cartilaginous fish (e.g., sharks). Luminescent vertebrates (except for certain fish), mammals, higher plants, and viruses do not exist-except for those versions created by recombinant technology."

http://www.chemistryexplained.com/Ar-Bo/Bioluminescence.html