giant octopus – Fossilized jaws suggest giant finned octopuses up to ~19 meters long were top predators in the Late Cretaceous ocean, reshaping ideas about marine food webs.
“Kraken” is a word from folklore, but the latest fossil evidence is giving the myth a serious biological upgrade.
Fossilized jaws point to enormous octopus-like cephalopods—some estimated at roughly 7 to 19 meters long—that lived in the Late Cretaceous seas. when dinosaurs dominated land.. The study centers on carefully measured beaklike mouthparts. a rare kind of fossil that can survive long enough to tell scientists who these animals were and where they sat in the marine hierarchy.
Because octopuses are built mostly from soft tissue, their bodies usually don’t fossilize well.. Misryoum notes that for most fossil octopus finds. the “hard evidence” is left behind in the jaw—structures comparable to a hook-and-beak system that can persist long after the rest of the animal decays.. That limitation has long frustrated efforts to reconstruct size, identity, and feeding behavior.. Here. Misryoum reports that researchers leaned into what jaws can offer: shape. wear patterns. and how jaw proportions compare across known living and extinct cephalopods.
The fossil record is unusually rich for this project.. Misryoum says the team re-examined 15 fossil cephalopod jaws and used a special documentation workflow to identify and model 12 additional jaw fossils embedded within rock from Japan.. Instead of traditional extraction that can destroy delicate specimens. the method effectively “reads” the fossils by grinding the rock down layer by layer and photographing each stage.. An artificial intelligence-assisted digital reconstruction then helped create detailed models of fossils too fragile to remove intact—turning stone into a kind of searchable archive.
The jaws initially appeared to represent multiple extinct species.. After comparison, Misryoum reports the researchers grouped the material into two: Nanaimoteuthis jeletzkyi and the much larger Nanaimoteuthis haggarti.. The reassignment matters because it narrows the evolutionary picture.. Based on jaw characteristics and comparisons with both extinct cephalopods and today’s relatives. the animals appear to be early finned octopuses—cephalopods that likely had body forms adapted for active swimming in addition to grappling with prey.
The size estimates are the headline for many readers, but Misryoum emphasizes how they connect to anatomy.. The largest lower jaw attributed to N.. haggarti could cradle a grapefruit. and its jaw size appears about 50% larger than that of the 12-meter-long modern giant squid. one of the largest cephalopods known today.. When researchers extend the comparison from “beak size” to full body proportions—including the broad. arm-like umbrella the animal would have carried—they estimate a total length in the range of about 7 to 19 meters.
Those numbers put these giant octopuses in striking company.. Misryoum reports that N.. haggarti might have rivaled or exceeded the biggest marine predators of the time. including massive reptiles such as mosasaurs and long-necked plesiosaurs.. More importantly than raw competition, the study’s clues inside the jaws suggest a lifestyle built on force and repetition.. The fossils show consistent wear and damage. consistent with powerful feeding—biting down on hard prey items like shells and bones.
This is where the discovery reshapes the story of Cretaceous oceans.. For decades. Misryoum notes. food-web reconstructions have often treated large vertebrates as the dominant top predators. with invertebrates cast into lower tiers.. The jaw evidence pushes back against that assumption, suggesting that giant invertebrates—octopuses—also occupied apex or near-apex roles.. In other words. the deep sea may have been home to heavyweight predators with very different body designs from reptiles. but similar ecological impact.
Skepticism is part of good science. and Misryoum includes it here: the researchers are working from incomplete remains. and jaw-only fossils can understate or overstate proportions.. A paleontologist not involved in the study cautions that N.. jeletzkyi may have been smaller than the estimates. but still sees little doubt that the animals ranged among the top predators.. The larger conclusion. Misryoum says. remains robust: these cephalopods were not just “big for octopuses. ” they were predators capable of competing with the ocean’s elite.
Looking ahead, Misryoum highlights the most tantalizing next step—finding fossils that preserve more than jaws.. One researcher hopes that some giant octopus specimens may eventually turn up with stomach contents preserved.. That would shift the question from “how big were they?” to “what exactly did they hunt?” If the contents include shelly prey such as large ammonites. that would clarify how they carved out their niche among other predators.. If they also ate vertebrates, the food-web implications would grow even larger.
For now. Misryoum says. the Cretaceous ocean’s “kraken” secrets are coming into focus through the hardest part of a soft-bodied animal.. And with improved imaging. careful measurements. and new fossil finds. the deep sea’s ancient challengers may soon be described with far more confidence than a myth can ever offer.