19-meter ancient octopus crushed vertebrates, was apex predator

A groundbreaking study by Hokkaido University researchers has unveiled a startling new perspective on ancient marine ecosystems. The findings, published in the prestigious journal 'Science,' suggest that colossal octopuses, some estimated to be up to 19 meters long, dominated the food chain during the Cretaceous period, approximately 100 to 72 million years ago. This challenges the long-held view that marine food webs were primarily governed by vertebrate predators.

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The fact that the total length reached almost 20 meters means it could have been larger than large marine reptiles of the same era.

The research, led by Dr. Shin Ikegami and Professor Yasuhiro Iba, analyzed 27 octopus fossils discovered in geological strata from Japan and Canada. These fossils revealed two distinct species, with one reaching an astonishing length of up to 19 meters, potentially dwarfing even large marine reptiles of the era. Professor Iba highlighted the significance of this discovery, stating, "The fact that the total length reached almost 20 meters means it could have been larger than large marine reptiles of the same era." This positions these ancient cephalopods as the true 'rulers of the sea.'

What particularly astonished the researchers was the evidence of extreme wear and tear on the fossilized beaks. Professor Iba noted, "The most surprising discovery is the degree of wear on the jawbone." The extensive damage, including breaks, scratches, and cracks, indicates immense biting force, far exceeding that seen in modern cephalopods that consume hard-shelled prey. This suggests these ancient giants were formidable predators, capable of crushing the bones and shells of marine reptiles and ammonites, cementing their status as apex predators.

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The most surprising discovery is the degree of wear on the jawbone.

This research also sheds light on the evolutionary history of octopuses, which has been difficult to trace due to their soft bodies and the rarity of fossilization. The study utilized advanced 'digital mining' techniques, employing precise machinery and AI systems to analyze rock samples and reconstruct 3D models of the fossils. This technological leap allowed for an unprecedented level of detail, revealing insights previously unattainable and fundamentally altering our understanding of prehistoric marine life. The implications for paleontology are immense, prompting a re-evaluation of the roles played by invertebrates in ancient ecosystems.

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The extensive damage, including breaks, scratches, and cracks, indicates immense biting force, far exceeding that seen in modern cephalopods that consume hard-shelled prey.