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the claim

Jellyfish have no brain, only a diffuse nerve net.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
8 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 jellyfish have no brain, only a diffuse nerve net?

Yes. Two reference works state directly that jellyfish have no brain and possess a diffuse nerve net, and several other sources confirm the diffuse nerve net organisation in jellyfish.

Verdict: SUPPORTED · 8 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 8
Jellyfish
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Jellyfish. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Jellyfish

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More for · 7
Box jellyfish
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Box jellyfish. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Box_jellyfish

From single neurons to behavior in the jellyfish Aurelia aurita -
Get citation
From single neurons to behavior in the jellyfish Aurelia aurita - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.7554/eLife.50084

Genetics of Sleep and Sleep Disorders
2024
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Gehrman, P., Keene, A. C., & Grant, S. F. (2024). Genetics of Sleep and Sleep Disorders. play.google.com. https://play.google.com/store/books/details?id=2tkUEQAAQBAJ&source=gbs_api

The Marine World
2021
Get citation
Dipper, F. (2021). The Marine World. play.google.com. https://play.google.com/store/books/details?id=lfYlEAAAQBAJ&source=gbs_api

Centralization and Symmetry
2002
Get citation
Centralization and Symmetry. (2002). doi.org. https://doi.org/10.1093/oso/9780195105049.003.0003

Neuromechanical wave resonance in jellyfish swimming
2021
Get citation
P., H. A., W., X. N., & J., G. B. (2021). Neuromechanical wave resonance in jellyfish swimming. authors.library.caltech.edu. https://doi.org/10.1073/pnas.2020025118

Revisiting nerve nets: functional organization and evolutionary implications.
2026
Get citation
K, J. & G, J. (2026). Revisiting nerve nets: functional organization and evolutionary implications.. doi.org. https://doi.org/10.1038/s44318-026-00879-w

also asked as
  • Is it true that jellyfish have no brain and only a diffuse nerve net?
  • Do jellyfish really lack a brain and rely only on a diffuse nerve net?
  • Are jellyfish actually brainless with just a nerve net?
  • True or false: jellyfish have no brain, only a diffuse nerve net?
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