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Volume 647 Issue 8089, 13 November 2025
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Volume 647 Issue 8089, 13 November 2025

Joint effort

One of the features that sets mammals apart from other vertebrates is their jaw — most jawed vertebrates have several bones in their lower jaw, but mammals have just one. The evolution of this jaw structure has long been used as a marker to separate mammals from other vertebrates. In this week’s issue, Fangyuan Mao and colleagues reveal fresh details about the evolution of the mammalian jaw joint. The researchers used micro-computed tomography to examine the skulls of two mammal predecessors — the newly described Polistodon chuannanensis (pictured in an artist’s impression on the cover) and the new species Camurocondylus lufengensis. The Polistodon skull is about 160 million years old and has a previously unknown arrangement of the jaw bone. Camurocondylus is older, dating from the Early Jurassic epoch around 200 million years ago, and again displays a novel jaw shape. Together, the team argues, these diverse jaw joints indicate that the evolutionary path to the mammalian jaw was one of independent innovations in response to ecological pressures.

Cover image: Chuang Zhao.

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