A New Long-Necked Dinosaur from Brazil Reveals an Ancient Land Bridge

A team of Brazilian paleontologists has described a new species of long-necked dinosaur, Dasosaurus tocantinensis, that roamed northeastern Brazil about 120 million years ago during the Early Cretaceous. Announced on May 6, 2026, the discovery is notable not only for the animal’s size, an estimated 20 meters long, but for what its family tree reveals about a vanished, interconnected world.

The research was led by Elver Luiz Mayer, a professor at the Federal University of the São Francisco Valley (UNIVASF), and a multidisciplinary team, with results published in the Journal of Systematic Palaeontology. By comparing the fossil’s anatomy with other sauropods, the scientists found that its closest known relative lived in what is today Spain. That kinship points to ancient faunal exchange between South America and Europe during the slow breakup of the supercontinent Gondwana.

According to the researchers, the ancestors of this Brazilian dinosaur likely dispersed to the South American continent by way of North Africa between roughly 140 and 120 million years ago, when those territories were still joined. The find helps fill a gap in the fossil record of the period and adds a new data point to the story of how giant herbivores spread across a world whose continents were arranged very differently from today.

As with any single fossil, the conclusions come with the usual scientific caution: relationships inferred from bone anatomy can shift as more specimens emerge, and the precise dispersal routes are reconstructions rather than direct observations. Even so, Dasosaurus tocantinensis is a heartening reminder that important discoveries are still being made far from the world’s best-known fossil beds, by local researchers piecing together deep history one bone at a time.