The existence of dinosaurs and finding their traces now have been a matter of debate, and a recent discovery reveals the presence of an the identified dinosaur species unearthed during road rail construction in northeastern Brazil offers fresh insight into how giant dinosaurs spread across ancient continents. Here’s all you need to know about it…A 20-meter giant found at a construction siteThe species, named Dasosaurus tocantinensis, is described in a study published in the Journal of Systematic Palaeontology. Measuring about 20 meters long, the creature lived roughly 120 million years ago. Its fossils were uncovered about eight meters deep during construction of a road rail terminal in Davinópolis, Maranhão.Evolutionary connections across the AtlanticOne of the find’s most striking aspects is its link to Europe. The dinosaur’s closest known relative lived in present-day Spain, suggesting both belonged to a lineage that once spanned regions now separated by the Atlantic Ocean. Scientists propose that its ancestors reached South America via North Africa between 140 and 120 million years ago, back when these landmasses were still joined within the supercontinent Gondwana.The largest known Dinosaur in MaranhãoElver Luiz Mayer, a professor at the Federal University of the São Francisco Valley (UNIVASF), noted that Dasosaurus is the largest known dinosaur in Maranhão. Other species found in the state were smaller, such as the 10-meter-long diplodocid Amazonsaurus maranhensis.Initial confusion and discovery timelineMayer became involved with the find in 2021 while working at the Federal University of Southern and Southeastern Pará (UNIFESSPA). Archaeologists monitoring the construction project under environmental licensing rules had uncovered the bones and initially mistook them for prehistoric mammals that lived alongside early humans. Recognizing the depth and geological context, Mayer identified the remains as Lower-to-Upper Cretaceous fossils and assembled a multidisciplinary team to study them.A remarkably Intact SpecimenAfter extensive preparation in Pará, the fossils were returned to Maranhão. They are now housed in São Luís at the State Center for Natural History and Archaeology Research. Max Langer, a professor at the University of São Paulo (FFCLRP-USP) who worked on the study, noted that the specimen is unusually complete—including tail vertebrae, ribs, foot, arm, and leg bones, as well as a 1.5-meter femur. Researchers believe more fossils from the same individual remain at the site.Meaning Behind the NameThe name Dasosaurus tocantinensis pays homage to the local environment and geography. “Daso” means “forest,” referencing the dense wooded landscape early Portuguese colonizers described in Maranhão. “Tocantinensis” points to the Tocantins River, which flows near the excavation site.Bone structure InsightsMicroscopic analysis led by Tito Aureliano and Aline Ghilardi at the Federal University of Rio Grande do Norte (UFRN) revealed a growth pattern combining traits of older sauropods with those of titanosaurs. As per the study, this finding reflects that this key bone growth and remodeling traits emerged earlier than expected, shedding light on how these sauropods managed to grow so massive.Balancing development and scienceThe discovery highlights a common problem in field science: heavy machinery often cuts into deep rock layers that standard surveys can’t reach, but it can just as easily smash fragile fossils. Langer and Mayer pointed out that without dedicated site monitoring and clear communication between construction crews and paleontologists, valuable specimens get destroyed. Right now, the team is working with the contractor to secure access to the site so they can dig out the remaining bones.