Fig. 2 in Tooth Histology of the ParareptileSoturnia caliodonfrom the Upper Triassic of Rio Grande do Sul, Brazil

Fig. 2. The procolophonid Soturnia caliodon Cisneros and Schultz, 2003, UFRGS PV1112T, from the Norian (Upper Triassic) Caturrita Formation of Rio Grande do Sul, Brazil. A. Enamel and primary dentine from the apical region of m2. B. Enamel and primary dentine from the region between the apex and the cervix of m2. The slightly sigmoid curvature of the crystallites is highlighted by a dashed line. C. Primary and secondary dentine in the anterior portion of the cervical region of m2. Note the irregular primary dentinal tubules compared to those in the apical region (A and E). D. Attachment bone in the posterior region of the base of m2. E. Primary dentine in the apical region of m2. F. Tooth implantation in m1 and part of m2. Attachment bone, characterized by globular or irregular bone cell lacunae, is predominant in the reddish areas of the photograph. Dentine is shown in blue, note some small amounts of pedicle dentine within the dentary bone. Dentary bone tissue, represented in yellow and orange, showing predominance of elongated and anteroposteriorly directed bone cell lacunae. The apex is placed to the left in B and C. All photographs taken using polarized light.