A 150-million-year-old Dacentrurus armatus skull from Riodeva, Spain, has been identified as the best-preserved stegosaur skull ever found in Europe, giving researchers rare anatomical detail from a group whose fragile skulls seldom survive.
The Vertebrate Zoology study uses that fossil to propose Neostegosauria, a new stegosaur group spanning medium and large species that lived in Europe and Africa in the Middle-Late Jurassic, North America in the Late Jurassic, and Asia into the Early Cretaceous.
Researchers say the new classification could reshape how scientists trace the evolution and global spread of plated dinosaurs, with the skull offering key evidence on how stegosaur heads evolved.
The Riodeva site is still producing material, including more bones from the same adult and rare juvenile remains, strengthening Teruel's status as a major center for studying dinosaur evolution.
How does one Spanish fossil connect armored dinosaurs across Europe, Africa, and North America?
What unique skull feature is rewriting 150 years of stegosaur evolution?
Europe's Most Complete Stegosaur Skull Reveals New Evolutionary Clade and Redefines Dinosaur History
Overview
A remarkable discovery at the Riodeva site in Spain has revealed Europe’s most complete stegosaur skull, belonging to Dacentrurus armatus and dating back about 150 million years. This exceptionally preserved fossil, uncovered by Fundación Dinópolis, provides an unprecedented look at the anatomy of these iconic plant-eating dinosaurs. Intact dinosaur skulls are extremely rare, making this find especially important for European paleontology. Detailed study by Sergio Sánchez Fenollosa has already uncovered new anatomical features, offering crucial insights into the biology, evolution, and broader family relationships of stegosaurs.