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the claim

Jellyfish have existed for over 500 million years, long before dinosaurs appeared.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 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 existed for over 500 million years, long before dinosaurs appeared?

Yes. A natural history museum page states jellyfish have survived over 500 million years and are more ancient than the dinosaurs, and peer-reviewed sources likewise date jellyfish to more than 500 million years ago.

Verdict: SUPPORTED · 4 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 · 4
Jellyfish: The smart stinging creatures drifting through our oceans | Natural History Museum
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Jellyfish: The smart stinging creatures drifting through our oceans | Natural History Museum. (n.d.). nhm.ac.uk. https://www.nhm.ac.uk/discover/what-is-a-jellyfish.html

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More for · 3
Population parameters and exploitation status of banana jellyfish (Catostylus perezi, Ranson, 1945) in the northern waters of the Oman Sea
2025
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Hashemi, S. A., Doustdar, M., Azhdari, A., Rahimi, G., & Rahmati, R. (2025). Population parameters and exploitation status of banana jellyfish (Catostylus perezi, Ranson, 1945) in the northern waters of the Oman Sea. isfj.ir. http://isfj.ir/article-1-2850-en.pdf

Lens eyes or compound eyes?
2015
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Lens eyes or compound eyes?. (2015). doi.org. https://doi.org/10.1007/978-3-319-17476-1_2

A genetically tractable jellyfish model for systems and evolutionary neuroscience
2021
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Brandon, W., Tsuyoshi, M., & Aditya, N. (2021). A genetically tractable jellyfish model for systems and evolutionary neuroscience. authors.library.caltech.edu. https://authors.library.caltech.edu/records/2r11c-has67

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