A 19-meter giant octopus swam with mosasaurs in the Cretaceous seas

About 80 million years ago, during the late Cretaceous, the oceans were filled with enormous and fierce creatures. Mosasaurs, long-necked plesiosaurs, and massive sharks dominated the marine food chain. For decades, scientists believed vertebrates were the top predators of this era. Now, a new study published in Science challenges that idea by revealing evidence of a bone-less predator that could reach up to 19 meters in length.

Researchers uncovered fossilized remains of an ancient finned octopus, likely one of the largest invertebrates to have ever existed. These animals were equipped with powerful, hardened beaks and probably possessed high intelligence for their time. This discovery shifts our understanding of Cretaceous marine ecosystems, highlighting the role of invertebrates as apex predators.

Before this study, Cretaceous marine ecosystems were generally understood as worlds in which large vertebrate predators occupied the top of the food web.

The fossils demonstrate that giant invertebrates could have played a dominant predatory role, previously underestimated due to the rarity of octopus fossils. Their size and hunting capabilities suggest they were formidable hunters, reshaping the narrative of prehistoric oceanic life.

This finding raises new questions about the evolution of invertebrates and their ecological roles in ancient seas. It also emphasizes how much remains to be discovered about Earth's deep past, as each fossil adds a crucial piece to the puzzle of life's history.