New Spinosaurus Species Discovered in Sahara Reveals River Hunting Secrets

A team of paleontologists has uncovered a new species of fish-eating dinosaur in the Sahara Desert, shedding fresh light on how these unusual predators lived and disappeared. The newly identified dinosaur, named Spinosaurus mirabilis, offers some of the strongest evidence yet that certain massive meat eaters thrived along ancient rivers rather than in open deserts or coastal seas.

The fossil was discovered at Jenguebi, a remote and previously unexplored site in the central Sahara. The bones were preserved in layers of ancient river sediment dating back about 95 million years. That setting suggests the dinosaur lived in a lush inland river system, a sharp contrast to the dry landscape seen in the region today.

The research, led by Paul C. Sereno of the University of Chicago and published in the journal Science, describes a creature with distinctive physical traits. Most striking is a tall, curved bony crest rising from the top of its skull.

This dramatic feature separates Spinosaurus mirabilis from its close relative, Spinosaurus aegyptiacus. Scientists believe the crest may have helped the animal attract mates or signal dominance to rivals.

Fossils of two long-necked dinosaurs were also found buried nearby in the same rock layers, offering further clues about the ecosystem that once flourished there.

Spinosaurus species in Sahara, a river hunter, not a sea monster

For years, scientists debated whether Spinosaurus hunted along ocean coastlines or swam in deep waters in pursuit of prey. The new findings suggest a different story. Researchers concluded that Spinosaurus mirabilis likely stalked rivers and riverbanks, moving through shallow water as it hunted fish.

Its skull structure supports that idea. The dinosaur had a long, narrow snout designed for catching slippery prey. Compared with its close relative, it had a slightly lower snout and more widely spaced teeth toward the back of its mouth. These differences indicate that multiple species of Spinosaurus evolved unique traits while sharing similar feeding habits.

The study also outlines three major stages in the evolution of this group of dinosaurs. The first stage began in the Jurassic period, when early members developed long, thin skulls ideal for snapping up fish. In the second stage, during the Early Cretaceous period, these predators spread widely and became dominant hunters around the ancient Tethys Sea.

The third stage marked the rise of the largest species, including those that specialized in shallow-water ambush hunting. These giants were mainly found in northern Africa and parts of South America.

Rise and sudden disappearance

To better understand how these dinosaurs lived, researchers compared their body shapes with those of modern birds that hunt in water. The analysis showed that spinosaurids shared similarities with both wading birds, such as herons, and diving birds. However, they stood apart from other meat-eating dinosaurs, highlighting how unusual they were among their prehistoric peers.

Despite their success, the group’s dominance did not last. Around 95 million years ago, rising sea levels and major climate shifts transformed their habitats. Researchers linked those environmental changes to the sudden extinction of the entire spinosaurid family.

The discovery of Spinosaurus mirabilis reinforces the idea that Spinosaurus was not a one-of-a-kind predator but part of a long line of specialized river hunters. Over millions of years, these Spinosaurus species in the Sahara adapted to life near water, carving out a unique place in Earth’s history before vanishing as conditions changed.