Fossilized fish skull shakes up the evolutionary history of jaws

415-million-year-old fossil adds to the growing evidence that sharks are not primitive

Jawed fish tree

Janusiscus schultzei, a 415-million-year-old fish, shared traits with modern sharks and bony fish, suggesting that the common ancestor of both of these aquatic organisms had a bony external skeleton.

K. Trinajstic

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