Spinosaurus mirabilis: Giant “Miraculous” Spinosaur with Bizarre Crest Discovered Deep in Sahara — Size of T. rex!

Paleontologists have unveiled Spinosaurus mirabilis (“the miraculous”), a colossal new spinosaurid from the heart of the Sahara in Niger, whose 95-million-year-old fossils reveal a predator the size of Tyrannosaurus rex crowned with one of the strangest cranial crests ever seen in a dinosaur.

Excavated from the remote Jenguebi locality in the Cenomanian Farak Formation, the near-complete skull and partial skeleton belong to a 13–15-meter-long animal. Unlike its better-known relative S. aegyptiacus, this species possessed a dramatically tall, forward-curving, blade-like midline crest projecting far above the snout — likely brightly colored for display. The discovery was published in Science (February 2026) by Paul Sereno’s University of Chicago team.

The fossils were recovered from ancient river-channel deposits hundreds of kilometers inland from the Tethys Sea, confirming a semi-aquatic ambush lifestyle in lush riparian wetlands. Its elongated crocodile-like snout and interlocking teeth were perfectly adapted for catching fish, while the mᴀssive body and sail-backed silhouette allowed it to dominate the riverbanks.

“This unicorn-like crest is completely new,” Sereno notes. “It shows spinosaurids were experimenting with extreme cranial ornamentation, turning the Sahara’s Cretaceous rivers into a stage for bizarre visual displays.” The animal reached true T. rex size — roughly 12–15 meters long and several tonnes — proving that spinosaurids were among the largest predators of their time.

CT scans reveal the crest was lightweight yet structurally strong, likely used in species recognition or intra-specific combat. The find, part of expeditions that have yielded 55 tons of fossils, underscores how the “green Sahara” supported giant, specialized carnivores.

As further biomechanical and display studies unfold, Spinosaurus mirabilis promises to illuminate how these “miraculous” predators dominated their lost river world — proving that even the most bizarre dinosaurs still hold dramatic surprises.