by The 'immortal jellyfish' is so named because it can, theoretically, live forever.
For all we know, some of these tiny, translucent blobs have been drifting along since well before the demise of the dinosaurs, around 66 million years ago.
When an immortal jellyfish (Turritopsis dohrnii) grows old or damaged, the species can evade death by reverting to a baby polyp stage.
It does so by reabsorbing its tentacles and coming to rest as a blob of undifferentiated cells somewhere on the seafloor.
Source
For all we know, some of these tiny, translucent blobs have been drifting along since well before the demise of the dinosaurs, around 66 million years ago.
When an immortal jellyfish (Turritopsis dohrnii) grows old or damaged, the species can evade death by reverting to a baby polyp stage.
It does so by reabsorbing its tentacles and coming to rest as a blob of undifferentiated cells somewhere on the seafloor.
Source
