Scientists find fossilized red blood cells in a 115-million-year-old dinosaur bone

Updated 2026-11-03 · told from many outlets at once

Scientists found fossilized structures in an Aratasaurus bone in northeast Brazil that resemble red blood cells and contain heme.

• The study documents fossilized structures similar to red blood cells with in situ chemical evidence related to heme.
• Kliti Grice stated that the discovery is a mineral and molecular echo of ancient biology.
• Mary Schweitzer stated she did not find the red blood cell data convincing.
• The Aratasaurus fossil was discovered in a mine in the north-east of Brazil.

Outlets: ABC Color, ABC News Australia (Top), Dagens Nyheter, El Comercio (Peru), El Mundo (Portada), The Guardian, The Independent, The Korea Herald

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