Turritopsis nutricula

was a breed of jellyfish that was considered to be immortal. Its cells underwent transdifferentiation, a process in which it could revert to a younger stage and grow old again an infinite amount of times. Olivia Colasanto suggested that there might have been jellyfish out there that have lived for thousands and thousands of years. (TV: End of the Road)
Category:Species from the real world
Category:Earth invertebrates