“Jellyfish are immortal”

The idea that jellyfish are immortal often stems from a remarkable discovery concerning a particular species, rather than a general truth about all jellyfish. This intriguing notion has captured public imagination, leading many to believe that these gelatinous creatures defy the typical rules of life and death. The origin of this common misconception lies in the unique biological capabilities of one specific type of jellyfish.

The scientific basis for this intriguing concept lies with the "immortal jellyfish," Turritopsis dohrnii. This small hydrozoan possesses a unique biological trick: when faced with stress, injury, or old age, it can revert its cells back to an immature polyp stage, essentially restarting its life cycle. This process, known as transdifferentiation, allows it to avoid death from natural causes, theoretically making it biologically immortal. This remarkable ability was first observed in the 1990s, offering a fascinating glimpse into the potential for cellular regeneration.

However, it is crucial to understand that this extraordinary ability is specific to Turritopsis dohrnii. The vast majority of the thousands of other jellyfish species have defined and often short lifespans, ranging from a few days to several months or even a couple of years. People commonly believe the myth of immortal jellyfish because the captivating nature of the Turritopsis dohrnii's unique regeneration often leads to a generalization that overlooks the diverse biology of the broader jellyfish family. While T. dohrnii offers a glimpse into potential biological immortality, it remains an exception in the marine world, making the broader claim of jellyfish immortality plausible for only one specialized species.