File:Lophosteus superbus oral lamina in occlusal view.jpg

English: Occlusal view of the oral lamina. (A-B) Numbering of tooth positions (TP). (A) Pulp cavities of the first-generation teeth and dermal odontodes. Arrows indicate the directions of the feeder vessels radiating from the ossification center. The feeder vessels in blue run longitudinally only beneath the first-generation teeth, but never do it labially, and these longitudinal feeder vessels may have penetrated the old oral lamina at the early stage. The horizontal vascular mesh in pink, which represents the new oral lamina beyond the first-generation teeth, supports the lingual replacement columns in the interval that lacks feeder vessels. (B) Pulp cavities of replacement teeth and overgrowing odontodes are added. For the feeder vessels, only those newly incorporated at the jaw margin are shown. Note, RC2-6 is covered by O3g-1, and RC6-6 is covered by O3g-5. Dashed oval, an example of the discontinuity of the pulp cavities between a first-generation tooth and its successive replacement teeth, which suggests the replacement of the first-generation tooth has been delayed, but the drift of the delayed replacement teeth still follows the same file. All inserted positions are also aligned with the tooth files of preexisting positions. (C-E) Comparison between the tooth replacement of File 2–3 and File 4–5. C is aligned to A. The successive resorption surfaces of RC2-4, which are similar to those of RC4-8, are not shown, except the last and the first basal resorption surface and the semi-basal resorption surface. Note, the resorption surfaces of RC4-8 gradually change in orientation and density. (F) Antero-occlusal view of the lingual founder ridge and the first-generation teeth showed in C, showing the transition from no resorption, via semi-basal resorption, to basal resorption, as the tooth rows increasingly overlap.