Giant ‘Kraken’ Octopus Ruled the Ocean 100 Million Years Ago, Study Suggests

### Discovery of Prehistoric Giant Octopus Challenges Marine Predator Hierarchy

Recent research has unveiled the existence of a colossal mollusc that may have been one of the largest marine predators approximately 100 million years ago, akin to the mythical kraken. This groundbreaking study, spearheaded by researchers from Hokkaido University in Japan, suggests that certain varieties of ancient octopus could have achieved lengths of up to 60 feet.

Published in the journal *Science*, the study counters previous beliefs regarding the role of octopuses in the oceanic food chain during the Late Cretaceous period, a time when formidable terrestrial predators like Tyrannosaurus rex existed. By meticulously examining fossilised jaws—dating back between 100 and 72 million years—the researchers observed that these extinct octopuses possessed astonishing physical adaptations that enabled them to dominate their marine environment.

The findings are compelling; the wear patterns on the fossils indicate these ancient creatures could crack shells and bones, hinting at a diet that may have included large marine reptiles such as mosasaurs and plesiosaurs. Dr. Yasuhiro Iba, a paleontologist and the lead author of the research, commented on the surprising extent of the wear observed on the jaws. He noted that the evidence suggested aggressive interactions with prey, marking these giant octopuses as fierce hunters in their time.

Fossils were uncovered in regions like Japan and Vancouver Island, contributing to a clearer picture of this fascinating species. Identified as members of the extinct finned octopus group known as Cirrata, these molluscs exhibited features that distinguished them from modern counterparts. The research highlights that they were not merely oversized versions of today’s octopuses but were, in fact, apex predators at the pinnacle of the Cretaceous marine food web.

Dr. Iba emphasised the implications of these findings for our understanding of historical marine ecosystems. “Our study demonstrates that Cretaceous seas were not solely the domain of large vertebrate predators,” he stated, indicating a more layered and complex predator hierarchy than previously assumed.

In contrast to the prehistoric octopus, the largest modern squids are considerably smaller. The giant Pacific octopus typically reaches around 16 feet. While they can prey on larger species, such as sharks, their diet mainly consists of shrimp, fish, and clams. Furthermore, modern octopuses are renowned for their intelligence and problem-solving capabilities, with the giant Pacific variety noted for overcoming challenges like escaping from closed containers.

Intriguingly, the jaw fossils of these ancient octopuses revealed lateralisation, a phenomenon where one side of an organism’s body becomes more robust than the other, frequently associated with enhanced cognitive functions. This concept may imply that these prehistoric creatures possessed a level of intelligence previously unimagined for molluscs of their size.

The research team employed advanced techniques like grinding tomography and artificial intelligence modelling, allowing for detailed analysis and reconstruction of these ancient jaw structures. This innovative approach not only sheds light on the physical capabilities of these giant creatures but also opens avenues for future paleontological discoveries.

Looking ahead, Dr. Iba indicated that these methods could lead to further insights into ancient ecosystems. “Combining digital fossil-mining with AI has the potential to uncover many more hidden fossils,” he remarked, envisioning a future where the complexities of prehistoric life are brought to light with unprecedented clarity.

As scientists continue to probe the depths of our planet’s evolutionary history, this study serves as a reminder of the diverse and often surprising tapestry of life that has existed beneath the waves. The revelations regarding these ancient octopuses not only enrich our understanding of marine life in the Cretaceous period but also highlight the remarkable evolutionary journeys of its inhabitants. The importance of preserving such knowledge cannot be overstated, as it enriches our comprehension of both current biodiversity and the intricate histories that shape our planet.