When did the first fish live on Earth?

Reconstruction of Haikouichthys ercaicunensis based on fossil evidence. Talifero/Wikimedia Commons, CC BY-SA

The oldest fossils of animals resembling a fish date back between 518 million and 530 million years ago. Discovered in China and called Haikouichthys, these animals were about an inch long (2.5 cm) and had a head with seven to eight slits at its base that looked like gills.

LINK (via The Conversation)

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