He added: "With each new result, the picture became clearer: we were looking at a Diplodocus."

What does this mean for dinosaurs crossing the Atlantic?

The discovery's biggest implication goes beyond a new dot on the map. A Diplodocus in Europe, roughly 150 million years ago near the end of the Jurassic Period, is strong evidence that dinosaurs moved between North America and Europe at that time.

The researchers suggest these animals may have crossed temporary land bridges that appeared when sea levels fell during regressive phases of the proto-North Atlantic Ocean, the young ocean then opening between the two continents.

Sánchez Fenollosa called the dig "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." The discovery, he said, also helps scientists better understand Iberian Mesozoic ecosystems and the diversity of sauropods that inhabited the European Jurassic.

Co-author Dr. Alberto Cobos, managing director of Fundación Dinópolis, put the animal in local context: "The Diplodocus from El Castellar was approximately 25 meters long (comparable in size to its North American relatives), making it another of the giant sauropods of the Spanish Jurassic, alongside other sauropod dinosaurs from Teruel with characteristics very different from those of diplodocids, such as Turiasaurus and Losillasaurus."

Why was a giant dinosaur living in Jurassic Spain?

The new specimen joins an already remarkable roster of enormous sauropods known from the Spanish Jurassic, and the region keeps yielding more. The area around the fossil site has produced remains from numerous dinosaur groups — sauropods, theropods, stegosaurs, and ornithopods — suggesting that ancient coastal environments in eastern Iberia supported complex, highly diverse dinosaur ecosystems.

"The fossils of all these dinosaurs, including those of the new Diplodocus specimen, make Teruel a reference place for understanding this great diversity," Cobos said.

The findings come with the usual caveats that apply to any single specimen: one skeleton establishes that Diplodocus reached Europe, but many details — how common the genus was there, how long it persisted, and exactly which route it took across or around the proto-Atlantic — remain open questions for future discoveries.

Where can you see it?

The fossils are now on display in the dinosaur hall of the Museo Aragonés de Paleología at Dinópolis in Teruel, a city in eastern Spain located roughly between Madrid and Valencia, where they will serve both research and public education.

A quick reminder of why Diplodocus matters

Diplodocus ranks among the most recognizable dinosaurs ever discovered, known for its enormous length of up to 25 meters, its long whip-like tail, and its relatively small head. First discovered in the United States in 1878, its skeleton casts spread to major natural history museums worldwide in the early 20th century, turning the animal into an international symbol of paleontology and one of the most familiar dinosaurs in popular culture.

Now, nearly 150 years after its first discovery, the iconic giant has a second home on the map — and a land bridge's worth of new questions to answer.