Appendix S1

Micro-CT sections through the three specimens (left) with black line indicating position on corresponding 3D surfaces (right). A, Transverse section through the left first intercoronoid fossa of MHMN 06-538. B, Transverse section through the right precoronoid fossa of UMZC GN.792. C, Transverse section through the anterior lower jaw of UMZC GN.1147.三组标本的显微计算机断层扫描（Micro-CT）断层切片图像展示于左侧，图中黑线标注了各标本在对应三维（3D）表面（右侧）上的对应位置。其中：A为MHMN 06-538标本左侧第一冠状突间窝的横断面断层图像；B为UMZC GN.792标本右侧冠状突前窝的横断面断层图像；C为UMZC GN.1147标本下颌前部的横断面断层图像。