A stegosaur skull so complete it is rewriting the evolutionary story of plated dinosaurs has been unearthed in Spain. The fossil, belonging to Dacentrurus armatus, is the best preserved stegosaur skull ever found in Europe. Dinosaur skulls are notoriously fragile and rarely survive intact, making this discovery a rare window into how these armored giants evolved.
The skull that survived 150 million years
Paleontologists from the Fundación Conjunto Paleontológico de Teruel Dinópolis uncovered the fossil at the Están de Colón site within the Villar del Arzobispo Formation in Riodeva, Teruel, Spain. The rock layer dates to the Late Jurassic period, around 150 million years ago. Stegosaurs were plant eating, four legged dinosaurs known for the rows of plates and spikes that ran from their necks to their tails. Their skulls, however, are extremely delicate and almost never survive the fossilization process. This specimen is so well preserved that it has revealed previously unknown details about the anatomy of Dacentrurus armatus, a species first described 150 years ago in 2025.
A new branch on the dinosaur family tree
Based on the detailed study of the skull, the research team has proposed a new hypothesis for how stegosaurs evolved and spread across the world. They have formally defined a new group called Neostegosauria. This group includes medium and large stegosaur species that lived across several continents during the Jurassic and Early Cretaceous periods. According to the study, members of Neostegosauria inhabited areas that are now Africa and Europe during the Middle and Late Jurassic, North America during the Late Jurassic, and Asia during the Late Jurassic and Early Cretaceous. The new classification could reshape how scientists understand the evolutionary history and global distribution of plated dinosaurs.
The fossil site in Riodeva continues to yield important discoveries. The findings were published in the scientific journal Vertebrate Zoology. For local residents and the broader scientific community, this skull is more than a rare fossil. It is a key that unlocks a deeper understanding of how these iconic dinosaurs lived, evolved, and moved across ancient continents.
