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Artist reconstruction of Alienacanthus malkowskii, a 365-million-year-old placoderm fish from Poland and Morocco. (Beat Scheffold & Christian Klug)

A 365-million-year-old fish with an extreme underbite showcases vertebrate diversity

What paleontologists had believed to be spiny fins turned out to be elongated jaws. New examination of fossils that were 365 million years old revealed a fish with a remarkable lower jaw.

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