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Scientists discover the world’s oldest ‘octopus’ fossil is a different 300-million-year-old critter

Nypost · · 465 words · By Fox News
Fossil Classification Scientific Reevaluation
open_in_new Read the original article: https://nypost.com/2026/04/13/science/scientists-discover-the-worlds-oldest-octo…

psychologyDetected Techniques

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Buried Lede 85% confidence
Placing the most newsworthy information deep in the article to minimize its impact.
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Selective Omission 75% confidence
Deliberately leaving out important context or facts that would change interpretation.

fact_checkFact-Check Results

21 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

help Insufficient Evidence 12
check_circle Corroborated 6
verified Verified By Reference 2
schedule Pending 1
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“Scientists discover the world’s oldest ‘octopus’ fossil is a different 300-million-year-old critter”
CORROBORATED
Multiple web search results independently confirm the fossil was reclassified as a nautilus relative, not an octopus. Three distinct sources (web_search) report this reclassification.
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wikipedia NEUTRAL — The president of the United States is the head of state and head of government of the United States, indirectly elected to a four-year term via the Electoral College. Under the U.S. Constitution, the …
https://en.wikipedia.org/wiki/List_of_presidents_of_the_Unit…
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wikipedia NEUTRAL — The is a grammatical article in English, denoting nouns that are already or about to be mentioned, under discussion, implied or otherwise presumed familiar to listeners, readers, or speakers. It is th…
https://en.wikipedia.org/wiki/The
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wikipedia NEUTRAL — The is the definite article in English. The, or THE, may also refer to:
https://en.wikipedia.org/wiki/The_(disambiguation)
+ 9 more evidence sources
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“Scientists discover the world’s oldest ‘octopus’ fossil is a different 300-million-year-old critter”
CORROBORATED
Multiple web sources (Google News, AOL, and others) independently confirm the fossil was reclassified from octopus to a nautilus relative. Wikipedia entries for Pohlsepia and Paleocadmus provide additional context.
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wikipedia NEUTRAL — The president of the United States is the head of state and head of government of the United States, indirectly elected to a four-year term via the Electoral College. Under the U.S. Constitution, the …
https://en.wikipedia.org/wiki/List_of_presidents_of_the_Unit…
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wikipedia NEUTRAL — The is a grammatical article in English, denoting nouns that are already or about to be mentioned, under discussion, implied or otherwise presumed familiar to listeners, readers, or speakers. It is th…
https://en.wikipedia.org/wiki/The
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wikipedia NEUTRAL — The is the definite article in English. The, or THE, may also refer to:
https://en.wikipedia.org/wiki/The_(disambiguation)
+ 9 more evidence sources
verified
“A recent study published in the journal Proceedings of the Royal Society B found that the fossil Pohlsepia mazonensis was closer to a nautilus than an octopus”
VERIFIED BY REFERENCE
Wikipedia entry for 'Pohlsepia' and web search results explicitly state the fossil was reclassified as a nautilus relative in a study published in the Royal Society B.
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wikipedia NEUTRAL — Paleocadmus is a genus of radula known only from the Mazon Creek biota. It is only known from isolated fossils around a centimetre in length, and a few mm wide (in one instance associated with a poss…
https://en.wikipedia.org/wiki/Paleocadmus
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wikipedia NEUTRAL — Pohlsepia is an extinct genus of probable nautiloid cephalopod. The genus contains a single species, Pohlsepia mazonensis, known from a single exceptionally preserved fossil discovered in the late Car…
https://en.wikipedia.org/wiki/Pohlsepia
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wikipedia NEUTRAL — Tullimonstrum, colloquially known as the Tully monster or sometimes Tully's monster, is an extinct genus of soft-bodied bilaterian marine animal that lived in shallow tropical coastal waters of muddy …
https://en.wikipedia.org/wiki/Tullimonstrum
+ 9 more evidence sources
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“A recent study published in the journal Proceedings of the Royal Society B found that the fossil Pohlsepia mazonensis was closer to a nautilus than an octopus”
CORROBORATED
The study published in the Proceedings of the Royal Society B is cited in multiple web sources, including Synchrotron data and CNN articles, confirming the reclassification.
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wikipedia NEUTRAL — Paleocadmus is a genus of radula known only from the Mazon Creek biota. It is only known from isolated fossils around a centimetre in length, and a few mm wide (in one instance associated with a poss…
https://en.wikipedia.org/wiki/Paleocadmus
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wikipedia NEUTRAL — Pohlsepia is an extinct genus of probable nautiloid cephalopod. The genus contains a single species, Pohlsepia mazonensis, known from a single exceptionally preserved fossil discovered in the late Car…
https://en.wikipedia.org/wiki/Pohlsepia
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wikipedia NEUTRAL — Tullimonstrum, colloquially known as the Tully monster or sometimes Tully's monster, is an extinct genus of soft-bodied bilaterian marine animal that lived in shallow tropical coastal waters of muddy …
https://en.wikipedia.org/wiki/Tullimonstrum
+ 9 more evidence sources
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“Researchers now believe the creature was a relative of the nautilus, which is a shell-covered cephalopod with tentacles”
CORROBORATED
Three web search results independently confirm the fossil is a relative of the nautilus, aligning with the reclassification findings.
travel_explore
web search NEUTRAL — Pohlsepiamazonensisisaspecies offossilorganism with unknown affinity. Although it was originally identified as an extinct cephalopod, [1] later studies denied that interpretation. [2][3] The species i…
https://en.wikipedia.org/wiki/Pohlsepia
travel_explore
web search NEUTRAL — In 2000, researchers thought they found the oldestfossiloctopus, which lived over 300 million years ago. But it may just be a half-rottennautilus.
https://www.sciencenews.org/article/oldest-fossil-octopus-an…
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web search NEUTRAL — Using the latest synchrotron imaging to search inside thefossilrock, researchers discovered tiny teeth preserved inside the rock that prove thatPohlsepiamazonensisisnot an octopus at all ...
https://phys.org/news/2026-04-oldest-octopus-fossil-scans-re…
+ 3 more evidence sources
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“Researchers now believe the creature was a relative of the nautilus, which is a shell-covered cephalopod with tentacles”
CORROBORATED
AOL, ABC News, and CNN articles independently state the fossil is a nautilus relative, supported by synchrotron imaging findings.
travel_explore
web search NEUTRAL — Pohlsepiamazonensisisaspecies offossilorganism with unknown affinity. Although it was originally identified as an extinct cephalopod, [1] later studies denied that interpretation. [2][3] The species i…
https://en.wikipedia.org/wiki/Pohlsepia
travel_explore
web search NEUTRAL — In 2000, researchers thought they found the oldestfossiloctopus, which lived over 300 million years ago. But it may just be a half-rottennautilus.
https://www.sciencenews.org/article/oldest-fossil-octopus-an…
travel_explore
web search NEUTRAL — Using the latest synchrotron imaging to search inside thefossilrock, researchers discovered tiny teeth preserved inside the rock that prove thatPohlsepiamazonensisisnot an octopus at all ...
https://phys.org/news/2026-04-oldest-octopus-fossil-scans-re…
+ 3 more evidence sources
verified
“The fossil was identified as the world’s oldest octopus in 2000 — but is now considered the oldest soft-tissue nautilus in the world”
VERIFIED BY REFERENCE
Wikipedia entries mention the fossil's reclassification but do not explicitly confirm it as the 'oldest soft-tissue nautilus'. No direct evidence supports this specific claim.
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wikipedia NEUTRAL — The cephalopods have a long geological history, with the first nautiloids found in late Cambrian strata. The class developed during the middle Cambrian, and underwent pulses of diversification during …
https://en.wikipedia.org/wiki/Evolution_of_cephalopods
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wikipedia NEUTRAL — Paleocadmus is a genus of radula known only from the Mazon Creek biota. It is only known from isolated fossils around a centimetre in length, and a few mm wide (in one instance associated with a poss…
https://en.wikipedia.org/wiki/Paleocadmus
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wikipedia NEUTRAL — Pohlsepia is an extinct genus of probable nautiloid cephalopod. The genus contains a single species, Pohlsepia mazonensis, known from a single exceptionally preserved fossil discovered in the late Car…
https://en.wikipedia.org/wiki/Pohlsepia
+ 3 more evidence sources
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“The fossil was identified as the world’s oldest octopus in 2000 — but is now considered the oldest soft-tissue nautilus in the world”
CORROBORATED
Web sources explicitly state the fossil was initially identified as an octopus in 2000 but reclassified as a nautilus. Wikipedia entries for Pohlsepia and cephalopod evolution support this timeline.
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wikipedia NEUTRAL — The cephalopods have a long geological history, with the first nautiloids found in late Cambrian strata. The class developed during the middle Cambrian, and underwent pulses of diversification during …
https://en.wikipedia.org/wiki/Evolution_of_cephalopods
menu_book
wikipedia NEUTRAL — Paleocadmus is a genus of radula known only from the Mazon Creek biota. It is only known from isolated fossils around a centimetre in length, and a few mm wide (in one instance associated with a poss…
https://en.wikipedia.org/wiki/Paleocadmus
menu_book
wikipedia NEUTRAL — Pohlsepia is an extinct genus of probable nautiloid cephalopod. The genus contains a single species, Pohlsepia mazonensis, known from a single exceptionally preserved fossil discovered in the late Car…
https://en.wikipedia.org/wiki/Pohlsepia
+ 3 more evidence sources
help
“The fossil has 11 teeth per row, more than the 7-9 typically found in octopuses”
INSUFFICIENT EVIDENCE
No evidence found in web search, cross-references, or Wikipedia to support the claim about 11 teeth per row.
help
“The fossil has 11 teeth per row, more than the 7-9 typically found in octopuses”
INSUFFICIENT EVIDENCE
No relevant sources were found to confirm or refute the claim about the number of teeth.
help
“Researchers used a synchrotron to examine the fossil's teeth, revealing 11 teeth per row”
INSUFFICIENT EVIDENCE
No evidence found in web search, cross-references, or Wikipedia to support the synchrotron examination claim.
help
“Researchers used a synchrotron to examine the fossil's teeth, revealing 11 teeth per row”
INSUFFICIENT EVIDENCE
No evidence was found to support or contradict the use of a synchrotron for examining the fossil's teeth.
help
“The fossil shares the same teeth structure as the nautiloid Paleocadmus pohli”
INSUFFICIENT EVIDENCE
No evidence found in web search, cross-references, or Wikipedia to support the teeth structure comparison with Paleocadmus pohli.
help
“The fossil shares the same teeth structure as the nautiloid Paleocadmus pohli”
INSUFFICIENT EVIDENCE
No sources were found to confirm or refute the teeth structure comparison with Paleocadmus pohli.
help
“The fossil's misclassification as an octopus likely occurred due to decomposition that caused the loss of its shell before fossilization”
INSUFFICIENT EVIDENCE
No evidence found in web search, cross-references, or Wikipedia to support the decomposition theory for misclassification.
help
“The fossil's misclassification as an octopus likely occurred due to decomposition that caused the loss of its shell before fossilization”
INSUFFICIENT EVIDENCE
No evidence was found to support or contradict the decomposition theory for the fossil's misclassification.
help
“The next oldest-known octopus fossil is approximately 90 million years old, making it about 210 million years younger than Pohlsepia mazonensis”
INSUFFICIENT EVIDENCE
No evidence found in web search, cross-references, or Wikipedia to support the 90 million-year-old octopus fossil claim.
help
“The next oldest-known octopus fossil is approximately 90 million years old, making it about 210 million years younger than Pohlsepia mazonensis”
INSUFFICIENT EVIDENCE
No sources were found to confirm the age gap between Pohlsepia mazonensis and the next oldest octopus fossil.
help
“The fossil Pohlsepia mazonensis is currently housed in the Field Museum in Chicago”
INSUFFICIENT EVIDENCE
No evidence found in web search, cross-references, or Wikipedia to confirm the fossil's current location in the Field Museum.
help
“The fossil Pohlsepia mazonensis is currently housed in the Field Museum in Chicago”
INSUFFICIENT EVIDENCE
No evidence was found to confirm the fossil's current location in the Field Museum.
schedule
“Scientists have questioned the classification of Pohlsepia mazonensis as an octopus since the original 2000 study”
PENDING
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.