Two new Jurassic species — the morganucodontan-like Dianoconodon youngi and the pseudotribosphenic shuotheriid Feredocodon chowi — offer key information about the evolutionary shift from the jaw joint bones to those of the middle ear in early mammals. Dianoconodon youngi. Image credit: Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences. Both Dianoconodon youngi and Feredocodon chowi lived in China over...