Scientists have found a 520 million-year-old Chinese fossil of a shrimp-like creature with an exquisitely preserved heart and blood vessels that represent the oldest-known cardiovascular system.
Named Fuxianhuia protensa, the creature was a primitive arthropod, a group of invertebrates with external skeletons that includes crustaceans like crabs, lobsters and shrimp as well as insects, spiders and millipedes.
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