Extended Data Fig. 4: Comparison of left upper and lower jaws in lateral view of Ambolestes, Sinodelphys, Juramaia and Eomaia.

Sinodelphys was redrawn from a previous study⁷ and reversed from the original; Juramaia was redrawn from a previous study⁵; and Eomaia was redrawn from a previous study² and reversed from the original. Scale bars, 2 mm.