Figure 4

Ferrodraco lentoni gen. et sp. nov. holotype rostral sections AODF 876. Cross-section (A) internal structure of premaxillary crest; (B) weak mandibular groove (grey arrow) and internal structure indicates the mandible is incomplete ventrally; (C–I) demonstrate variation in the depth of the palatal ridge and corresponding mandibular groove, with ironstone matrix represented by shaded region; (H) demonstrates replacement tooth is located lingual to the functional tooth; (J) section through (H) demonstrating the replacement tooth is distal to the functional tooth. The location of the functional and replacement teeth was based on their pulp cavities (black). Co-ossified dentaries in (K) anterior and (L) dorsal (occlusal) views. (M) Co-ossified premaxillae and maxillae in ventral (occlusal) view. (N) Schematic of premaxillae and maxillae in ventral (occlusal) view showing the subtle longitudinal palatal ridge. Abbreviations: ft, functional tooth; ll#, lower left; prid, palatal ridge; rt, replacement tooth; ul#, upper left; ur#, upper right. Scale bars: 20 mm for all figures.