Figure 2. A in Enamel microstructure evolution in anthracotheres (Mammalia, Cetartiodactyla) and new insights on hippopotamoid phylogeny

Figure 2. A, Cebochoerus robiacensis, vertical section of upper molar showing the straight and regular Hunter– Schreger bands (HSBs) throughout the enamel thickness. B, Choeropotamus sudrei, vertical section of lower molar, showing the straight and regular HSBs and the presence of a large band of radial enamel near the outer enamel surface (OES). C, Doliochoerus quercyi, vertical section of upper molar, showing similar anastomosis and bifurcation of HSBs. D, Tayassu pecari, synchronous prism undulations on horizontal section of upper molar. E, Aureliachoerus sp., vertical section of lower molar showing the straight and regular HSBs. F, Aureliachoerus sp., interprismatic matrix (IPM), forming closed coats in the inner portion of the enamel thickness. G, Aureliachoerus sp., IPM, forming inter-row sheets.