Fig. 4 in New material of the trechnotherian mammal Lactodens from the Early Cretaceous Jehol Biota: Comparison with Origolestes and implications for mammal evolution

Fig. 4. Upper molars of the trechnotherian mammal Lactodens sheni Han and Meng, 2016, from Aptian, Lower Cretaceous Jiufotang Formation, Caoyang City, Liaoning Province, China. A. Holotype (HG-M016) from Shangheshou area; right ultimate premolar and M1–M6 in buccal (A1) and occlusal (A2) views, showing the corresponding cusps on different teeth. B. ZGY0053 from Dapingfang; left upper molars (M1–M6) in occlusal (B1), buccal (B2), and lingual (B3) views. Image in B3 is horizontally flipped for convenience of comparison.