Figure 3. A in Enamel microstructure evolution in anthracotheres (Mammalia, Cetartiodactyla) and new insights on hippopotamoid phylogeny

Figure 3. A, Siamotherium krabiense, vertical section of upper molar. B, Siamotherium krabiense, horizontal section of upper molar, displaying only radial enamel. C, Anthracotherium crassum, vertical section of upper molar, showing the straight and regular Hunter–Schreger bands (HSBs), and the presence of thin bands of radial enamel near the enamel– dentine junction (EDJ) and outer enamel surface (OES). D, Anthracotherium crassum, horizontal section, showing thin bands of longitudinally sectioned prisms and wide bands of truncated prisms. E, Bothriodon velaunus, vertical section of upper molar, showing the inclined and regular HSBs throughout the enamel thickness and the presence of inter-row sheets.