Spinosaurus mirabilis: Sahara’s Scimitar-Crested Giant Matches T. rex in Size – Newly Named Desert Monster

In a paleontological triumph announced in February 2026 and published in Science, scientists have formally named Spinosaurus mirabilis — the “astonishing spine lizard” — a colossal spinosaurid from the heart of the Sahara. This Late Cretaceous predator, unearthed during a grueling 2022 expedition to remote central Niger, stands out for its dramatic, sword-like midline crest and body size comparable to Tyrannosaurus rex.

Led by University of Chicago paleontologist Paul Sereno, the 20-person team recovered more than 55 tons of fossils from a 95-million-year-old wetland deposit. Among the haul were cranial bones revealing a tall, blade-shaped crest likely sheathed in keratin for visual display — mating rituals or rival intimidation — and a long, low snout with interlocking teeth suited for snatching fish along forested riverbanks.

At roughly 12–13 metres long and 7–9 tonnes, S. mirabilis matches T. rex in overall mᴀss while exceeding it in length. It caps a 50-million-year spinosaurid radiation as one of the last survivors in a lush, river-laced ecosystem teeming with long-necked dinosaurs and giant fish like Mawsonia. The expedition’s 55-ton haul underscores the sheer volume of material needed to reconstruct this inland giant, overturning earlier views that spinosaurids were strictly coastal.

Sereno described the find as “an adventure and a half,” noting the crest’s sudden significance after initial confusion over the strange scimitar bones. This discovery rewrites spinosaurid evolution, highlighting extreme adaptations for display and predation deep in the Sahara — proof that Earth’s greatest predators continue to emerge from the sands, sharper and more magnificent than ever imagined.