Researchers find possible red blood cells in 115-million-year-old dinosaur fossil from Brazil

Scientists found structures resembling red blood cells and chemical traces of blood molecules in a 115-million-year-old dinosaur bone. The discovery comes from a small carnivorous dinosaur that lived in present-day Brazil. The bone belongs to Aratasaurus museunacionali, and researchers identified the cell-like structures alongside molecular evidence. However, not all experts are convinced the findings represent genuine fossilized red blood cells. Paleontologist Mary Schweitzer and others have raised doubts about the interpretation. The debate highlights ongoing challenges in verifying soft tissue preservation in ancient fossils.