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the claim

Certain species of jellyfish are biologically immortal.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
5 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that certain species of jellyfish are biologically immortal?

Yes. Multiple genomic and biological studies document that jellyfish species such as Turritopsis dohrnii can repeatedly undergo life cycle reversal and cellular transdifferentiation, effectively achieving biological immortality.

Verdict: SUPPORTED · 5 sources for, 0 against · Last checked

The analysis

The retrieved papers consistently support the claim that certain jellyfish species (specifically Turritopsis dohrnii and Turritopsis nutricula) exhibit life cycle reversal and rejuvenation, pointing to biological immortality. There are no papers refuting this claim.

Evidence for · 5
Comparative genomics of mortal and immortal cnidarians unveils novel keys behind rejuvenation.
2022
Turritopsis dohrnii is highlighted as a metazoan capable of repeatedly rejuvenating after reproduction, hinting at biological immortality.
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M, P., D, C., JG, P., D, Á., D, R., G, B., D, R., D, M., E, M., Y, E., G, M., JL, A., V, Q., & C, L. (2022). Comparative genomics of mortal and immortal cnidarians unveils novel keys behind rejuvenation.. doi.org. https://doi.org/10.1073/pnas.2118763119

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More for · 4
Transcriptome Characterization of Reverse Development in <i>Turritopsis dohrnii</i> (Hydrozoa, Cnidaria)
2019
Describes how medusae of Turritopsis dohrnii undergo reverse development and transdifferentiation in response to aging or damage.
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Matsumoto, Y., Piraino, S., & Miglietta, M. P. (2019). Transcriptome Characterization of Reverse Development in
                    <i>Turritopsis dohrnii</i>
                    (Hydrozoa, Cnidaria). doi.org. https://doi.org/10.1534/g3.119.400487

Cellular Reprogramming and Immortality: Expression Profiling Reveals Putative Genes Involved in <i>Turritopsis dohrnii’s</i> Life Cycle Reversal
2021
Examines the genetic network of cell reprogramming and reverse development in Turritopsis dohrnii as a system for researching immortality.
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Matsumoto, Y. & Miglietta, M. P. (2021). Cellular Reprogramming and Immortality: Expression Profiling Reveals Putative Genes Involved in <i>Turritopsis dohrnii’s</i> Life Cycle Reversal. doi.org. https://doi.org/10.1093/gbe/evab136

The conserved mitochondrial gene distribution in relatives of Turritopsis nutricula, an immortal jellyfish.
2014
Identifies Turritopsis nutricula as an organism that can revert its life cycle after sexual maturity, defining itself as an immortal organism.
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P, D., RN, K., D, B., & V, A. (2014). The conserved mitochondrial gene distribution in relatives of Turritopsis nutricula, an immortal jellyfish.. doi.org. https://doi.org/10.6026/97320630010586

Nontraditional systems in aging research: an update.
2021
Lists Turritopsis dohrnii alongside other organisms exhibiting longevity and immortality in aging research.
Get citation
J, M., M, P., M, M., P, U., L, S., A, T., & K, K. (2021). Nontraditional systems in aging research: an update.. doi.org. https://doi.org/10.1007/s00018-020-03658-w

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What does the evidence say?

The retrieved papers consistently support the claim that certain jellyfish species (specifically Turritopsis dohrnii and Turritopsis nutricula) exhibit life cycle reversal and rejuvenation, pointing to biological immortality. There are no papers refuting this claim.

Receipt History
first checked05 Aug 2026
judged → SUPPORTED · 8405 Aug 2026
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