New Spinosaurus Species with Striking Crest Discovered in Niger
Fossilized remains unearthed in Niger have revealed a new species of Spinosaurus, a massive predatory dinosaur distinguished by a prominent bony crest atop its skull. Named Spinosaurus mirabilis, the discovery marks the first new species within the Spinosaurus genus identified in over a century, according to research published February 19 in the journal Science.
The fossils, consisting of skull fragments and jawbones, suggest Spinosaurus mirabilis lived approximately 95 million years ago during the Late Cretaceous period. Researchers believe the dinosaur was a close relative of the previously known Spinosaurus aegyptiacus, first described in 1915 and shared its characteristic sail-like structure along its back. The find potentially resolves a long-standing debate among paleontologists regarding the lifestyle of Spinosaurus species – whether they were primarily marine predators or shoreline hunters.
Paul Sereno, lead author of the study and a professor of organismal biology and anatomy at the University of Chicago, described the new species as a “hell heron,” a semi-aquatic predator resembling a wading bird but scaled to a terrifying size. “It’s a semiaquatic shoreline hunter with physical similarities to a wading bird, but at a terrifying scale,” Sereno said. The analysis of the fossils indicates Spinosaurus mirabilis possessed a long, narrow snout adapted for catching fish, a flexible neck capable of a stabbing motion, and legs suited for wading in shallow water.
Crucially, the location of the fossils – far inland – supports the hypothesis that Spinosaurus species were adapted to freshwater environments rather than open oceans. “Finding a giant predator adapted to a marine environment in the middle of the continent would be as improbable as ‘finding a blue whale in Chicago’,” Sereno stated.
While sharing the defining sail-like structure with Spinosaurus aegyptiacus, Spinosaurus mirabilis exhibited a more pronounced and dramatic bony crest. Paleontologist Steve Brusatte, of the University of Edinburgh, who was not involved in the study, described the crest as “a striking bony crest projecting from its head, like Elvis’s pompadour.”
Researchers suggest the crest, despite its imposing appearance, was likely not used for combat due to its fragile and asymmetrical structure. Instead, it likely served a display function, potentially for attracting mates. The differences in crest morphology between Spinosaurus mirabilis and other Spinosaurus remains were key to confirming its status as a distinct species.
Spinosaurus mirabilis also possessed a lower jaw and interlocking teeth particularly well-suited for securing slippery fish. The study further illuminates the evolutionary history of Spinosaurus, suggesting a three-phase development: an initial adaptation of the skull for fish capture during the Jurassic period, a dominance as a predator around the ancient Tethys Sea during the early Cretaceous, and a specialization for ambush predation in shallow waters across North Africa and South America prior to the late Cretaceous.
The research team utilized modern imaging techniques, including hundreds of photographs and 3D modeling, to digitally manipulate and reconstruct the fragmented skull and jawbone pieces. Matteo Fabbri, an associate professor at the Johns Hopkins University School of Medicine’s Center for Functional Anatomy and Evolution, noted the discovery represents a “renaissance” in research on giant predatory dinosaurs, but cautioned that establishing a new species from fragmentary fossils remains challenging. “The fragmentary nature of the fossils doesn’t offer much to work with, leaving many questions about the animal’s true anatomy,” Fabbri said.
A replica of the Spinosaurus skull is currently on display at the Children’s Museum of Chicago, offering a glimpse of the dinosaur to the public. Sereno emphasized the importance of such displays in inspiring the next generation of paleontologists and fostering a sense of wonder about scientific discovery.