Dasosaurus tocantinensis is a 20-meter-long sauropod discovered during the construction of a road and rail terminal in Davinópolis, Maranhão, Brazil. According to research published in the Journal of Systematic Palaeontology, the dinosaur lived 120 million years ago and shares a direct evolutionary link with dinosaurs from Spain, suggesting a prehistoric migration route between Europe and South America via North Africa.
Construction Excavations Uncover Brazil’s Largest Dinosaur
Archaeologists monitoring environmental impacts at a construction site in Maranhão initially misidentified the find as Quaternary megafauna—mammals that coexisted with early humans. However, Professor Elver Luiz Mayer corrected this assessment after finding the fossils buried more than eight meters deep.
Mayer stated that the geological formation indicated materials from the transition between the Lower and Upper Cretaceous periods. The team recovered a massive 1.5-meter femur, along with caudal vertebrae, ribs, foot bones, and limb elements. This represents the largest dinosaur ever found in this specific region of Brazil.
Did you know? The name Dasosaurus tocantinensis is a geographical tribute. “Daso” is Greek for “forest,” referencing the Portuguese term “maranhão” used by early colonists to describe the local woods, while “tocantinensis” refers to the nearby Tocantins River.
The Gondwana Connection: Migration from Spain to Brazil
Phylogenetic analysis reveals that the closest relative of Dasosaurus tocantinensis lived in what is now Spain. This discovery provides evidence of a territorial connection between 140 and 120 million years ago, when South America, Africa, and Europe were linked as part of the supercontinent Gondwana.
According to the researchers, the ancestors of this giant migrated from the European archipelago, crossing through North Africa to disperse into South America. This finding challenges previous assumptions about the isolation of these landmasses during the Early Cretaceous.
Bone Microstructure and the Evolution of Gigantism
Researchers Tito Aureliano and Aline Ghilardi analyzed the internal bone microstructure to determine how the creature reached 20 meters in length. They discovered a “hybrid” growth model that blends two distinct biological eras.
- Primitive Traits: The bones retain tissue characteristics found in ancient, early sauropods.
- Advanced Traits: The bones integrate rapid bone remodeling processes typical of titanosaurs, the heaviest dinosaur lineage.
Aureliano and Ghilardi’s findings suggest that the biological innovations required for ultra-rapid bone growth appeared much earlier than previously believed by biologists.
Pro Tip: For those interested in paleontology, the Journal of Systematic Palaeontology is a primary source for peer-reviewed data on dinosaur classification and evolution.
Infrastructure as a Tool for Paleontological Discovery
In tropical regions like Brazil, dense vegetation and weathered soil rarely expose bare rock. This makes traditional prospecting difficult. The research team notes that without the excavators and blasting used in road and rail projects, paleontologists would lack the means to reach such depths.
However, this creates a paradox: the same machinery that reveals these fossils can destroy them. The research team is currently negotiating with the construction company to temporarily protect the site, as they believe more of the Dasosaurus skeleton remains beneath the planned railway tracks.
Frequently Asked Questions
How big was Dasosaurus tocantinensis?
It reached approximately 20 meters in length, with a femur measuring 1.5 meters.
Where was the dinosaur found?
In Davinópolis, located in the state of Maranhão, northeast Brazil.
Why is this discovery important for science?
It proves a migration link between Europe and South America and shows that rapid bone growth (gigantism) evolved earlier than previously thought.
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