The discovery of a long-celebrated fossil as the “world’s oldest octopus” has taken a surprising turn. Once thought to be 300 million years old, the fossil called Pohlsepia mazonensis is now revealed to belong to a different marine creature related to modern nautiluses.
For years, this fossil made headlines, even earning a spot in the Guinness Book of Records. Researchers believed it showed features like eight arms and fins typical of octopuses. However, advanced imaging technology has unearthed secrets hidden in the fossil’s structure, leading scientists to reconsider its identity.
These revelations came from synchrotron imaging, which utilizes intense beams of light to peek beneath rock layers. Scientists found tiny preserved teeth in the fossil, which confirmed it was not an octopus but rather a nautiloid—a group of marine animals that have existed for millions of years. This technique is likened to a modern forensic investigation on something that has been buried for eons, allowing researchers to reassess earlier conclusions.
Dr. Thomas Clements, the lead author and a lecturer in Invertebrate Zoology at the University of Reading, emphasized the importance of such advances in techniques. He stated, “It turns out the world’s most famous octopus fossil was never an octopus at all.” The fossil had decomposed before fossilization, which altered its appearance, making it look like an octopus.
This groundbreaking study, published in Proceedings of the Royal Society B, has sparked discussions in the scientific community about octopus evolution. Previously, scientists thought octopuses might have emerged much earlier in Earth’s history, but these findings suggest they appeared later, during the Jurassic period. This research aligns with new interpretations of evolutionary timelines, indicating the split between octopuses and their ten-armed relatives happened during the Mesozoic era, not hundreds of millions of years before.
The history of Pohlsepia mazonensis is a reminder of how science constantly evolves. Important discoveries are often hidden beneath layers of time, waiting for new technologies to uncover them. It’s a fascinating glimpse into how closely our understanding of the past is tied to the tools we have at our disposal today.
For further insights, you can read the full study here.
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Evolution,Evolutionary Biology,Fossils,Octopus,University of Reading
