Bioluminescence first evolved in animals at least 540 million years ago, pushing back previous oldest dated example Bioluminescence first evolved in animals at least 540 million years ago in a group of marine invertebrates called octocorals, according to the results of a new study from scientists with the Smithsonian's National Museum of Natural History.
https://phys.org/news/2024-04-....bioluminescence-evol