Comparisons of tooth development and jaw geometry in <i>Changchunsaurus parvus</i> and a hadrosaurid.

A. Tooth implantation and replacement in C. parvus. Bone of the jaw is indicated in black, successive tooth generations in blue, position of dental lamina in red and interdental bone in grey. B. Closeup of the lingual surface of the dentary in C. parvus (JLUM Ya-C160711d) showing the positions of the interdental bone and replacement foramina. C. Closeup of a developing tooth at the opening of the replacement foramen in thin section (TS0 1048) in C. parvus. D. Tooth implantation and replacement in a hadrosaurid dentary. Bone of the jaw is indicated in black, successive tooth generations in blue, position of dental lamina in red and interdental bone in grey. E. Lingual view of a hadrosaurid dentary (ROM 3500) showing position of the interdental bone and replacement foramina. F. Closeup of the replacement foramen at the base of a dental battery (ROM 3500) in thin section. Black arrows indicate positions of replacement foramina. Abbreviations: idb, interdental bone; jb, bone of the jaw.