Fossil Jaws Reveal 19-Meter Octopuses Hunted Cretaceous Seas 100 Million Years Ago
Updated
Updated · spacedaily.com · Jul 2
Fossil Jaws Reveal 19-Meter Octopuses Hunted Cretaceous Seas 100 Million Years Ago
3 articles · Updated · spacedaily.com · Jul 2
Summary
A 2026 Science study says giant finned octopuses lived about 100 million to 72 million years ago, with Nanaimoteuthis haggarti estimated at roughly 7 to 19 meters long.
Twenty-seven fossil jaws from Japan and Vancouver Island underpinned the finding; 12 were newly detected inside rock with high-resolution digital scans, helping explain why soft-bodied predators long escaped notice.
Blunting, chipping and asymmetric wear on the chitinous beaks suggest the animals repeatedly processed hard prey, supporting the view that they were active hunters near the top of marine food webs.
The 19-meter figure remains model-based rather than directly measured from a full body, but even the conservative 7-meter estimate would exceed any confirmed living octopus.
The fossils point to a Cretaceous ocean less dominated by vertebrates than the record suggests, indicating giant soft-bodied invertebrate predators played a larger ecological role than previously recognized.
How does a 62-foot 'Cretaceous Kraken' rewrite the history of our planet's apex predators?
AI just found a lost sea monster from a fossil. What other secrets of ancient Earth will it uncover next?
Apex Predator of the Cretaceous: The Discovery and Implications of the 19-Meter Octopus Nanaimoteuthis haggarti
Overview
The recent discovery of Nanaimoteuthis haggarti, a colossal octopus from the Cretaceous period, has changed how scientists view ancient marine ecosystems. Unlike its smaller relative N. jeletzkyi, which was more vulnerable, N. haggarti’s immense size meant it could only be challenged by the largest predators of its time. This positions it as a potential apex predator and challenges the long-held belief that vertebrates were always the top hunters in prehistoric oceans. The existence of such a giant invertebrate opens new perspectives on the roles of cephalopods and the complexity of ancient food webs.