The warty comb jelly is not your typical sea dweller. They can also regrow lost body parts, reproduce from the larval stage, and fuse their bodies with other comb jellies to survive injuries. They also do not have a permanent excretory opening and only form when absolutely necessary. But these characteristics, unusual as they are, have been largely overshadowed by what researchers discovered in 2024: the ability of animals to biologically prevent aging as a survival mechanism.<\/p>\n
What makes this discovery different from similar phenomena observed elsewhere in nature is the intentional and reactive nature of the process. Unlike Turritopsis dohrnii<\/em> <\/strong>the so-called “”immortal jellyfish<\/em>\u201d, as a kind of default biological habit, it can start its life cycle all over again once it reaches maturity. Mnemiopsis leidii<\/strong><\/em> It appears that they use reverse development as an active response to extreme stress. It doesn’t simply reset. Strategically retreat if necessary to survive.<\/p>\n This study Journal Proceedings of the National Academy of Sciences<\/em>was led by marine biologist Jo\u00e3o J. Sotoangel and colleague Pawel Burkhardt from the University of Bergen in Norway. But if it weren’t for a strange and puzzling moment in the lab, this research might never have come to fruition.<\/p>\n one day, Adult comb jelly Soto-Angel <\/strong>It had been kept in an aquarium in a laboratory, but it just disappeared. Instead, there was a specimen in a larval state. The observation was strange and almost unbelievable, but it was enough to convince him that there was something worth investigating more closely.<\/p>\n It is worth noting that early studies had already documented that adult comb jellies shrink in size and lose weight in response to food deprivation. However, these studies clearly excluded true age reversal. Sotoangel’s chance observation overturned that conclusion and set the stage for a controlled experiment.<\/p>\n Adult 65 years old Mnemiopsis leidii<\/em> <\/strong>Specimens were isolated in tanks for 15 days without food. After that period, they were fed one reduced meal per week. The researchers observed that the fleshy leaves that these animals develop as a marker of adulthood begin to be reabsorbed into the body. Over several weeks, 13 of the 65 specimens had fully recovered both their appearance and typical larval feeding behavior.<\/p>\n According to Sotoangel, witnessing the experience firsthand was shocking. “It was just fascinating to watch it slowly transform into a typical sea turtle larva, like going back in time.<\/em>\u201d said a press release from the University of Bergen.<\/p>\n Another subset of 15 specimens from the original 65 specimens underwent more invasive procedures. Adult leaves were surgically removed and a layer of physical trauma was added on top of starvation. The results spoke for themselves. Six of these 15 subjects completed the reversal process in just 15 days. This was significantly faster than the approximately 6 weeks it took for 7 of 50 non-surgical specimens to achieve the same results. The more severe the stress, the faster the creature regresses to its juvenile form.<\/p>\n The mechanism behind this change is still unknown. The molecular processes that cause reverse development have not yet been identified, Burkhardt said, as well as the question of what happens to the animal’s neural networks during the transition.<\/p>\nThe missing adult, the reason for its accidental discovery<\/h2>\n
Starvation, surgery, and a slow return to childhood<\/h2>\n
![\"Life](\"https:\/\/hyokal.com\/wp-content\/uploads\/2026\/04\/1776684004_96_Scientists-thought-this-sea-creature-would-die-Instead-it-reverted.jpg\")
What science doesn’t yet know and why it matters<\/h2>\n