Diplodocus fossils found beyond North America for the first time
For almost 150 years, every confirmed Diplodocus fossil had come from the same corner of the world: the Morrison Formation of the western United States. The giant sauropod was as American as paleontology itself.
Then a team from the Fundación Dinópolis started pulling tail vertebrae from a dig site in Teruel, Spain. The bones were unusually well-preserved — and as researchers studied them more closely, something about the anatomy kept drawing their attention in an unexpected direction.
A fossil that didn’t fit the map
Every Diplodocus confirmed before this find had come from the Morrison Formation — a vast stretch of sedimentary rock running through Wyoming, Utah, Colorado, and neighboring states. That’s where the genus was discovered in 1878, and that’s where it had stayed, scientifically speaking, ever since.
The La Tejería site in El Castellar, Teruel, sits roughly 5,000 miles from that territory. When the Fundación Dinópolis team recovered 14 well-preserved caudal vertebrae and several chevron bones, nobody immediately assumed they had something historic. The realization came gradually.
Lead author Sergio Sánchez Fenollosa described the process as watching a puzzle come together piece by piece. From the earliest stages of the anatomical study, the bones showed strong similarities to diplodocine sauropods, and each new analysis sharpened the picture. “With each new result, the picture became clearer,” he said. “We were looking at a Diplodocus.” The specimen is now considered one of the most complete diplodocid skeletons ever found in Europe.
How researchers confirmed the identity
Recognizing a genus from tail bones alone requires more than a hunch. The research team identified several specific anatomical hallmarks characteristic of Diplodocus: large pneumatic cavities inside the vertebrae, deep longitudinal grooves along the underside of the tail bones, distinctive forked chevron bones with unique medial fossae, and elongated vertebral centra without lateral ridges. That combination of features is diagnostic.
The team didn’t stop at visual comparison, though. Two advanced phylogenetic methods — maximum parsimony and Bayesian inference — were applied to test where the specimen fit within the sauropod family tree. Both approaches returned the same answer: the fossil belonged within the Diplodocus genus, as a close relative of Diplodocus hallorum. The study appeared in the peer-reviewed Journal of Vertebrate Paleontology, giving the finding the scrutiny a claim of this magnitude demands.
A 25-meter giant in Jurassic Iberia
The Spanish Diplodocus was no small outlier. At approximately 25 meters long — around 82 feet — it matched the scale of its North American relatives. By any measure, it was a giant.
Teruel was already known for producing enormous sauropods. Turiasaurus and Losillasaurus, both recovered from the same region, represent a very different branch of the sauropod family tree — yet their presence alongside a Diplodocus reveals just how varied the giant dinosaurs of Jurassic Iberia actually were. The surrounding area has also yielded remains from theropods, stegosaurs, and ornithopods, pointing to a complex, species-rich ecosystem in what were once ancient coastal environments. Co-author Dr. Alberto Cobos, managing director of Fundación Dinópolis, noted that the accumulation of finds makes Teruel “a reference place for understanding this great diversity” among Late Jurassic sauropods.
Evidence of a Jurassic crossing between continents
How does a dinosaur endemic to North America end up in Spain? The answer likely lies in the geography of a world that no longer exists.
Around 150 million years ago, the proto-North Atlantic Ocean separated North America from Europe — but it wasn’t necessarily impassable. During periods when sea levels dropped, temporary land connections may have emerged, allowing animals to move between the continents. Sánchez Fenollosa described the find as “some of the strongest paleontological evidence for episodes of dispersal and faunal exchange between the two continents across the proto-Atlantic Ocean during the Late Jurassic.” That’s a careful but significant claim. It doesn’t prove a land bridge existed — it does, however, add a concrete data point to a long-running debate about how dinosaur populations moved during this period.
The discovery also broadens the picture of sauropod diversity during the Late Jurassic, suggesting that populations were more mobile and more widespread than the North American fossil record alone had implied.
Why Diplodocus still captures the world’s imagination
Diplodocus has held a special place in public consciousness since its discovery in 1878. Its silhouette — enormous length, small head, long whip-like tail — became one of the defining images of paleontology in the early 20th century, when casts of its skeleton began appearing in natural history museums around the world. For generations of museum visitors, it was simply what a dinosaur looked like.
The fossils from Teruel are now on display in the dinosaur hall of the Museo Aragonés de Paleontología at Dinópolis, where they support both ongoing research and public education. That combination — scientific significance and public accessibility — feels right for a genus with this kind of history.
Nearly 150 years after its first discovery, Diplodocus is still producing surprises. A find in Spain doesn’t just extend the animal’s known range; it raises a broader question. If an iconic, well-studied dinosaur could turn up on the wrong continent, what else might the fossil record still be hiding in places nobody thought to look?
Discover more about this exciting finding here: Sergio Sánchez-Fenollosa, Josué García-Cobeña, Alberto Cobos. Intercontinental evidence of the iconic genus Diplodocus Marsh, 1878 (Dinosauria, Sauropoda). Journal of Vertebrate Paleontology, 2026; DOI: 10.1080/02724634.2026.2718423
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