Spinostropheus Facts
| Diet | Carnivore |
| Height | 1.5m |
| Length | 4m |
| Weight | 50 kg |
| Environment | Land |
| Era | Jurassic |
| Period | Middle Jurassic |
| Type | Theropod |
| Location | Niger, Africa |

| Diet | Carnivore |
| Height | 1.5m |
| Length | 4m |
| Weight | 50 kg |
| Environment | Land |
| Era | Jurassic |
| Period | Middle Jurassic |
| Type | Theropod |
| Location | Niger, Africa |
Spinostropheus was a theropod dinosaur that lived during the Middle Jurassic period, approximately 161 to 106 million years ago. Its fossils were discovered in the Tiourarén Formation of Niger, Africa, making it one of the African theropods from this time period. The single species, S. gautieri, is known primarily from vertebral remains that give this dinosaur its distinctive name.
As a theropod, Spinostropheus would have been a bipedal carnivore, walking on its powerful hind legs whilst using its arms for grasping prey. Based on the available fossil evidence, scientists estimate it was a medium-sized predator, roughly 4 metres in length and standing about 1.5 metres tall at the hip. The vertebrae that define this genus show distinctive spinal features, though the fragmentary nature of the remains makes detailed reconstruction challenging.
Living in what was then a warmer, more humid environment than modern-day Niger, Spinostropheus would have hunted smaller animals and possibly scavenged when opportunities arose. The Middle Jurassic period was a time when theropod dinosaurs were diversifying rapidly, and Spinostropheus represents part of this evolutionary expansion in Africa.
However, it's important to note that Spinostropheus is considered a nomen dubium by many palaeontologists due to the limited fossil material available. This means that whilst it was certainly a theropod dinosaur, many details about its appearance, behaviour, and relationships to other dinosaurs remain uncertain until more complete fossils are discovered.
Spinostropheus is primarily distinguished by its distinctive vertebrae with elongated neural spines, which give the genus its name meaning 'spiny vertebra'. The vertebral structure shows characteristics typical of medium-sized theropods, though the fragmentary nature of the fossils makes other distinguishing features difficult to determine definitively.
As a theropod, Spinostropheus would have been an active predator, likely hunting smaller dinosaurs, early mammals, and other vertebrates in its Middle Jurassic ecosystem. It probably used its sharp teeth and clawed hands to capture and process prey, though specific hunting strategies remain speculative due to the limited fossil evidence.
Spinostropheus was first described by Paul Sereno and colleagues in 1999. The original fossils were discovered at Tiourarén Formation, Niger.