Giant Octopus Fossils Reveal Ancient 'Kraken' as Apex Predators
Fossil evidence suggests there were real 'Kraken' – giant octopuses that fed on large animals at the top of the food chain – in ancient Cretaceous oceans, according to scientists at Hokkaido University in Japan. Their study, published in the journal Science, focuses on prehistoric cephalopods, a group that includes octopuses, squid, and cuttlefish.
Using high-resolution grinding tomography combined with machine learning, researchers identified beak fossil remains from extinct cephalopods that had fins and measured up to 7-19 meters long. These creatures occupied the top position in the food web, preying on other marine organisms, including vertebrates like mosasaurs and sharks. The cephalopods used their very hard beaks as crushing tools to kill prey, which included crustaceans, bony fish, and animals living on the ocean floor.
These findings fundamentally reshape our understanding of ancient marine ecosystems, illustrating that cephalopods were far more dominant than previously believed.
Discovery of Nanaimoteuthis jeletzkyi
The discovery of Nanaimoteuthis jeletzkyi has changed what we know about the evolution of cephalopods. Scientists used the size of the chitinous beaks – the only hard part of a cephalopod's body – to estimate how large these cephalopods would have been. The results show they were much larger than the largest living cephalopods, the giant squids, as noted in Science. The evidence indicates that these cephalopods were not only passive drifters but also very active and powerful predators of the largest marine reptiles alive at the time.
Evidence of Apex Predation and Advanced Cognitive Behavior
The researchers found heavy-duty wear patterns on the fossilized beaks, including chipped and scratched surfaces. Some specimens showed up to 10 percent of the beak tip worn away. This amount of wear is consistent with cephalopods crushing and eating very hard-shelled organisms, as well as bony organisms. The wear pattern on some beaks was asymmetric, indicating a lateralized preference for which direction they used to accomplish certain tasks. This suggests that these cephalopods had advanced cognitive abilities similar to modern intelligent cephalopods, alongside their size and hunting strategies.
Digital 3D Revealed a Hidden 60-Foot Predator
Due to the rarity of fossilized remains from soft-bodied organisms such as octopuses, these samples have been covered in rock concretions for millions of years. Scientists used an innovative method called 'digital fossil-mining,' utilizing high-resolution grinding tomography to expose the jaws internally via a combination of AI-facilitated 3D reconstruction. According to Science, their results confirmed that these 60-foot-long creatures existed, as well as extending the known evolutionary record for finned octopuses by 15 million years and the broader octopus record by 5 million years.
