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COMB JELLY
Popular Mechanics US
|March - April 2025
THE WARTY COMB JELLY, MNEMIOPSIS leidyi, is a fascinatingly weird creature that can regenerate parts of its body, reproduce from a larval stage, and even fuse its body with other comb jellies in order to survive when injured.
It also, according to a recent study, can revert from an adult back to its biologically juvenile state after it heals from a traumatic injury or bout of starvation. It's not the only weird sea dweller that can manipulate its age-the similarly goopy ocean blob Turritopsis dohrnii (or "immortal jellyfish") can restart its life from the beginning when it reaches maturity. But instead of the oddity being a sort of default life cycle quirk, M. leidyi's de-aging process is actively used for survival.
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