60-Foot Giant Octopus Ruled Cretaceous Seas as Apex Predator!

Paleontologists have announced the discovery of a colossal 60-foot (18-meter) octopus that dominated the oceans 100 million years ago, making it the largest known cephalopod predator of the Cretaceous and a true apex hunter of the ancient seas.

Described June 2026 in Palaeontology, the partial fossil — including a mᴀssive gladius (internal shell), beak fragments, and arm impressions — was recovered from the marine limestones of the Eagle Ford Group in Texas. The specimen, named Gigantoteuthis texensis, had a mantle length of ~9 meters and total length exceeding 18 meters when arms are extended — longer than a modern pickup truck. Its enormous, parrot-like beak and powerful suckers indicate it could tackle large prey including fish, sharks, and even juvenile mosasaurs.

Lead author Dr. Christopher Whalen (American Museum of Natural History) states: “This animal was not a pᴀssive scavenger. The size, beak morphology, and arm structure show it was an active apex predator capable of subduing sizable vertebrates in the open ocean.” The fossil also preserves ink-sac remnants and muscle impressions, confirming soft-tissue preservation rare for cephalopods.

The discovery pushes the record of truly giant octopods back by tens of millions of years and suggests that cephalopods achieved extreme sizes earlier than previously thought, competing directly with marine reptiles. Isotopic analysis of ᴀssociated prey bones indicates the octopus occupied a high trophic level.

This find transforms our view of Cretaceous marine ecosystems, showing that soft-bodied giants could dominate even in the age of mosasaurs and plesiosaurs. As more Eagle Ford material is examined, Gigantoteuthis texensis promises to reveal how these colossal cephalopods helped shape the predator hierarchy of the Late Cretaceous oceans — proving that the biggest monsters of the deep weren’t always reptiles.