A 300-million-year-old tentacled sea creature, once recognized globally by Guinness World Records as the world’s oldest octopus, has been stripped of its established identity. Newly published research now asserts the fossilized remains belong to a relative of a nautilus, fundamentally altering a foundational understanding of ancient marine life and demonstrating how established truths can be systematically redefined.
The creature, Pohlsepia mazonensis, described as a blob about the size of a human hand, was discovered in the Mazon Creek area of Illinois, an area rich in fossils from a period before dinosaurs walked the Earth. Its identification by paleontologists as an octopus in 2000 had previously “upended ideas about the evolution of the eight-tentacled cephalopods,” suggesting they emerged much earlier than previously thought and establishing a new timeline.
This previous identification created a “huge gap” with the next oldest-known octopus fossil, which is only about 90 million years old. Zoologist Thomas Clements, the lead researcher behind the new findings, noted that this “big gap got researchers sort of questioning, ‘Is this thing actually an octopus?’” indicating a pre-existing instability in the established narrative.
Clements described the fossil as “a very difficult fossil to interpret,” appearing as “a white mush.” He acknowledged that to a cephalopod researcher interested in everything octopus, “it does superficially look a lot like a deep-water octopus,” highlighting the subjective nature of initial interpretations that can become established facts.
The Shifting Narrative
To resolve the mystery of the “weird blob,” Clements and his team employed a synchrotron, a technology using fast-moving electrons to create beams of light “brighter than the sun,” to look inside the fossil rock. This advanced, high-tech method was used to re-evaluate what was previously accepted as fact.
Inside the fossil, they discovered a ribbon of teeth, known as a radula, which is common to all mollusks, including nautiluses and octopuses. The crucial finding was that each row of teeth had 11, while octopuses possess either seven or nine.
Clements stated, “This has too many teeth, so it can’t be an octopus.” He concluded, “And that’s how we realize that the world’s oldest octopus is actually a fossil nautilus, not an octopus,” directly contradicting the long-held classification.
The newly identified teeth matched those of a fossil nautiloid called Paleocadmus pohli, which had been found in the same Mazon Creek area. Clements suggested the mistaken identification may have happened because the creature decomposed and lost its telltale shell before it was fossilized, complicating the initial identification that became canonical.
Elite Methods of Redefinition
As a direct consequence of these new findings, published this week in the journal Proceedings of the Royal Society B, Guinness World Records announced it would no longer list Pohlsepia mazonensis as the earliest known octopus. Managing Editor Adam Millward stated they would be “resting the original ‘oldest octopus fossil’ title and look forward to reviewing this new evidence,” signaling a formal process of historical revisionism.
The Field Museum in Chicago, which holds the fossil in its collection, now possesses “the oldest soft tissue nautilus in the world,” according to Clements. This reclassification transforms the museum’s asset, shifting its historical significance from one identity to another.
Clements expressed that the museum should not be “disappointed” by the new evidence, suggesting a positive spin on the loss of an established record. He added that the museum’s “small collection of these ancient nautiluses” is “probably the best thing ever” for a cephalopod worker, highlighting the specialized interests driving these redefinitions.
Costs of Revisionism
The constant re-evaluation and reclassification of established scientific facts, even in paleontology, illustrate a broader pattern of undermining foundational knowledge. What was once a clear, record-holding identity is now dissolved into a different, less distinct category, mirroring the cultural dispossession faced by native populations whose histories are constantly reinterpreted.
The reliance on advanced, inaccessible technology like the synchrotron and the publication in specialized journals further entrenches the control of narratives within an elite scientific establishment, dictating what is considered “truth” to the broader public.