A recent discovery in Spain is shedding light on the anatomy of the Dacentrurus armatus, a significant stegosaur. This find is crucial for understanding how these iconic dinosaurs evolved and spread across Europe.
Stegosaurs were plant-eaters famous for the distinctive plates and spikes on their backs. They belonged to a group called Thyreophora, known for their armor. Compared to their cousins, like ankylosaurs, stegosaurs were lighter and walked on four legs.
Researchers from the Fundación Conjunto Paleontológico de Teruel-Dinópolis recently studied the most complete stegosaur skull ever found in Europe. Unearthed at the Están de Colón site in Riodeva, this skull dates back to around 150 million years ago during the Late Jurassic period.
The specimen belonged to Dacentrurus armatus, a species first described in 1875. Interestingly, 2025 will mark 150 years since it was named. This makes the discovery timely and relevant.
Skulls are rare among stegosaur fossils because they are fragile. Most known specimens are only partial. This new skull, however, preserves several bones, including important parts of the skull roof that help clarify the dinosaur’s feeding habits and relationships. A neck vertebra found nearby confirmed its identity.
Sergio Sánchez Fenollosa, a researcher involved in the study, emphasized the significance of this finding, stating, “This exceptional fossil reveals aspects of Dacentrurus armatus that were previously unknown, especially regarding its skull evolution.”
Notably, this fossil showed a unique feature: the supraoccipital bone at the back of the skull was angled differently than in other known stegosaurs. This may relate to how the dinosaur held or supported its long neck, offering insight into its living habits.
The study also reorganized the evolutionary framework of stegosaurs by analyzing 115 anatomical traits across 30 fossil groups. Their findings led to the introduction of a new group known as Neostegosauria, which includes medium to large stegosaurs from various continents. This challenges previous assumptions about their evolutionary relationships.
Alberto Cobos, another co-author of the study, highlighted that this research positions Riodeva as a key site for understanding stegosaur evolution. The site has produced about 200 fossils, including remains of other dinosaurs, indicating rich paleontological potential.
Cobos stated, “Riodeva continues to yield significant finds, including additional elements from the same adult specimen and juvenile individuals. This ongoing research enriches the paleontological understanding of our region.”
In summary, the discovery of the Dacentrurus armatus skull not only enhances our knowledge of stegosaur anatomy but also prompts new questions about their evolution. The findings from Riodeva could transform how we view these magnificent creatures and their place in Earth’s history.
Reference: “New insights into the phylogeny and skull evolution of stegosaurian dinosaurs: An extraordinary cranium from the European Late Jurassic (Dinosauria: Stegosauria)” by Sergio Sánchez-Fenollosa and Alberto Cobos, 26 May 2025, Vertebrate Zoology. DOI: 10.3897/vz.75.e146618
Source link
Dinosaurs,Evolutionary Biology,Fossils,Paleontology,Pensoft Publishers
