Fig. 1 in Tooth Histology of the ParareptileSoturnia caliodonfrom the Upper Triassic of Rio Grande do Sul, Brazil

Fig. 1. The procolophonid Soturnia caliodon Cisneros and Schultz, 2003, UFRGS PV1112T, from the Norian (Upper Triassic) Caturrita Formation of Rio Grande do Sul, Brazil. Partial left maxilla and mandible, before preparation (A), and during initial stages of preparation (B). C. I2 (to the left) and M1 (to the right), showing the limits of tooth morphogenetic fields (indicated by arrows), reticular bone tissue, fragmentary dentine, indicating tooth resorption in M1. D. A pronounced secondary dentine pulp deposition (indicated by an arrow) in m2. E. m1, note that enamel is completely absent in the cervix. F. Portion of m2 crown, showing the transition of thick enamel in the apex (to the top) to a very thin enamel close to the cervix (to the bottom). G. M1, M2, m1 and m2. Note remnant dentine fragments in most of M1. A–D in labial view, anterior is to the left. E–G in lingual view and under polarized light.