# Scientists Discover 115-Million-Year-Old Dinosaur Blood Molecules in Brazil Researchers identify fossilized red blood cells and heme molecules within an ancient theropod dinosaur. - **Source:** [Latest Science News -- ScienceDaily](https://brifing.si/source/0eef8637-6c5b-4e79-8f5b-6c9c6b36cf16) - **Published:** 2026-11-06 - **Topic:** [science](https://brifing.si/c/science) - **Original article:** - **On Brifing:** https://brifing.si/s/5759b4be-4c59-4437-b838-93662ebb1121 ## Groundbreaking Molecular Discovery An international research team has identified remarkably preserved red blood cells and chemical traces of hemoglobin within 115-million-year-old fossilized bones. These remains belong to Aratasaurus museunacionali, a meat-eating theropod dinosaur discovered in Brazil. This finding challenges long-held paleontological assumptions regarding the survival of delicate biological molecules over vast geological timescales. ## The Specimen Details The fossilized remains were originally unearthed in 2008 within a gypsum mine in the Ceará state of northeastern Brazil. Analysis focused on the right hind limb, including the femur and tibia. The specific individual dinosaur was approximately four years old at the time of its death and measured roughly 3.1 meters long. ## Evidence of Ancient Blood Researchers identified numerous mineralized structures resembling red blood cells located within the vascular canals of the dinosaur's limb bones. Chemical analysis confirmed the presence of heme molecules, which are essential components of hemoglobin. This provides the first definitive chemical confirmation of hemoglobin-derived molecules preserved inside fossilized dinosaur red blood cells. ## The Role of Hausmannite The extraordinary preservation of these biological materials is attributed to a mineral called hausmannite. This mineral acted as a stabilizing agent, effectively creating a natural time capsule that protected the microscopic evidence. It helped preserve the molecular components, including amino acids associated with collagen, over an immense span of geological time. ## Ideal Burial Conditions Scientists believe the environmental conditions during the dinosaur's burial were crucial for this preservation. The animal was likely covered quickly by sediment in an environment characterized by low oxygen levels and significant microbial activity. These specific conditions prevented the rapid breakdown of biological material that would typically occur in other environments. ## Clarifying the Findings Dr. Kliti Grice, the lead researcher from Curtin University, emphasizes that this is not a vial of dinosaur blood. Instead, it is a mineralized and molecular echo of ancient biology. The team explicitly clarifies that the survival of these cellular structures does not imply that ancient DNA has also survived. ## DNA vs. Biomolecules Dr. Grice explains that DNA and other large, information-rich biomolecules have different preservation characteristics compared to small, chemically transformed molecular residues. While the heme signals and cellular morphology persisted, the fragile DNA originally contained within those cells has not survived, distinguishing this discovery from science fiction scenarios involving genetic material. ## Collaborative Research Effort The study, published in the Proceedings of the National Academy of Sciences, involved a diverse international partnership. Contributors included Curtin University, the Japan Agency for Marine-Earth Science and Technology, the Brazilian National Museum, the Regional University of Cariri, and Johns Hopkins University. This collaboration was essential for the complex chemical analysis performed. ## New Paleontological Avenues This discovery opens new avenues for molecular-level paleontology, allowing researchers to investigate the evolution of blood, metabolism, and activity levels in extinct animals. Such data provides a direct molecular window into the physiology of these creatures, offering insights that are difficult to reconstruct through the examination of skeletal anatomy alone. ## Implications for Astrobiology The significance of this research extends beyond dinosaurs to the field of astrobiology. By understanding how fragile biological structures survive for millions of years, scientists may better identify potential chemical signatures of ancient life in extreme environments elsewhere in the universe, provided the conditions for such preservation are met. ## Challenging Scientific Dogma This study encourages paleontologists to test the limits of molecular survival rather than assuming biological information vanishes after a set period. By demonstrating that hemoglobin-derived molecules can persist across deep time, the research changes how scientists understand the preservation of molecular structures under harsh conditions, potentially revealing overlooked data in fossils. ## Sources covering this story - [Latest Science News -- ScienceDaily — Scientists Discover 115-Million-Year-Old Dinosaur Blood Molecules](https://www.sciencedaily.com/releases/2026/11/261105224542.htm) - [ScienceDaily – Top — Scientists Discover 115-Million-Year-Old Dinosaur Blood Molecules](https://www.sciencedaily.com/releases/2026/11/261105224542.htm) - [ScienceDaily – Plants & Animals — Scientists Discover 115-Million-Year-Old Dinosaur Blood Molecules](https://www.sciencedaily.com/releases/2026/11/261105224542.htm) - [Rzeczpospolita — Oldest Dinosaur Red Blood Cells Discovered in Brazilian Fossil](https://www.rp.pl/nauka/art45444411-odkryli-je-w-szczatkach-dinozaura-takich-dowodow-nie-bylo-nigdy-wczesniej) --- _Summary written by Brifing from the original reporting. 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