File:Lophosteus superbus jawbone ontogeny.jpg

English: Reconstructed ontogeny of the Lophosteus marginal jawbone relative to the development of the lateral line. Block diagrams in antero-external view, aligned so that the biting margin maintains a fixed position (note that this causes the older parts of the bone to move away from the biting margin and rotate anticlockwise during growth). The founder ridges and the ornament-like tooth TR7-7 mark the labial rotation and drift of the tooth rows. (A) The initial odontodes are formed as founder ridges. (B) Isolated dermal odontodes and teeth are added sequentially in opposite direction, respectively attaining a stellate and conical morphology. The teeth are shed semi-basally, establishing replacement tooth positions. (C) Teeth are cyclically replaced at the positions set up by the first-generation teeth; the second-generation odontodes invade the oral domain lingually and form around the lateral line canal labially. Lines of resorption around the lateral line canal indicates bone remodeling (see Figure 4—figure supplement 6). Note, the replacement of teeth and the overgrowth of odontodes may have commenced before the addition of the ultimate first-generation teeth. (D) The ventral extension of the lateral line canal partially resorbs the second-generation odontodes at its ventral border; more tooth rows are overgrown by the third-generation odontodes after being rotated to the face; new tooth positions are inserted to compensate the embedded labial tooth positions. Curved arrows, examples of the adding or shedding of teeth or dermal odontodes. The buried part of teeth and dermal odontodes, the embedded resorption surfaces and bone mineralized at earlier stages become increasingly grey. The lateral line is represented by neuromasts and epithelial cells. The size and number of neuromasts is schematic and only represents their presence. Perspective view. Scale bar not applicable.