New dinosaur species that hunted human-sized prey discovered in century-old Isle of Wight fossil

A skull fragment pulled from the cliffs of the Isle of Wight more than a century ago has finally revealed what it was. Reginald Walter Tooley, an amateur fossil hunter, found the remains at the foot of a cliff on the island's southwest coast sometime in the early 1900s. The Natural History Museum acquired it in 1924, and there it sat—in a drawer, unremarked upon, for nearly a hundred years. Only recently did scientists at University College London recognize what they were looking at: the skull of a predator that had never been formally identified, a creature that walked the earth 120 million years ago.

The dinosaur has been named Invictibellatrix amberina. The first part of its name means "unconquered female warrior." The second references the amber found in the rocks where the fossil was discovered. Researchers chose the designation deliberately, they said, to offer encouragement to those facing bullying, discrimination, and oppression—a gesture embedded in the formal taxonomy of deep time. The creature itself was a megaraptor, a member of a mysterious group of agile, two-legged carnivores that were closely related to tyrannosaurs. This is the first evidence that megaraptors ever lived in Europe at all. Until now, the group was thought to have remained confined to Asia.

Invictibellatrix was not the largest predator of its era. It measured between three and four meters long and stood just over 1.5 meters tall—roughly human height. But its size made it, in a peculiar way, more dangerous to humans than a Tyrannosaurus rex would have been. Dr. Cassius Morrison, who led the research, explained the calculus: a human would have weighed about a third of what this dinosaur weighed, making us perfectly-sized prey. A T. rex would have ignored us as too small to bother with. This megaraptor, by contrast, would have hunted us. The creature was built for that kind of predation. Rather than relying on massive jaws, it wielded powerful arms tipped with curved claws that could reach twenty centimeters long. It likely had feathers. In the food chain of its time, it occupied a role similar to that of a modern hyena—a capable mid-sized hunter that fed on smaller dinosaurs, lizards, and mammals.

To identify the fossil, researchers employed CT X-ray scans to examine the interior of the skull and construct three-dimensional models. They compared these models against the remains of other meat-eating dinosaurs: tyrannosaurs, spinosaurs, raptors. What emerged was a unique combination of features. The opening where the spinal cord entered the brain was oval-shaped. A crest running along the skull had an hourglass form. These details, taken together, marked it as something new to science.

The discovery carries implications beyond the Isle of Wight. Megaraptors are thought to have originated in Asia during the Early Cretaceous period. This fossil provides the first concrete evidence that they spread westward into Europe. From there, they appear to have reached Gondwana—the ancient southern supercontinent that encompassed present-day Africa, South America, and Antarctica. In Gondwana, megaraptors evolved into enormous apex predators, some developing claws as long as thirty-five centimeters. But in the northern landmass of Laurasia, where Europe sits, they vanished tens of millions of years later. Climate shifts, environmental change, or competition from tyrannosaurs may have driven them to extinction in the north. The southern populations, isolated and free from that competition, continued to thrive and grow.

Dr. Paul Barrett, a senior author on the research published in Royal Society Open Science, noted that despite more than two centuries of fossil collecting on the Isle of Wight, the island continues to yield new species. Carnivorous dinosaur discoveries have been particularly rare. The fact that this specimen sat in a museum drawer for nearly a century before anyone recognized its significance speaks to how much remains hidden in plain sight. Tooley's find, made a hundred years ago, has only now begun to tell its story.