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Fig. 8 | BMC Evolutionary Biology

Fig. 8

From: Synchrotron imaging of dentition provides insights into the biology of Hesperornis and Ichthyornis, the “last” toothed birds

Fig. 8

X-ray microtomographic images showing Ichthyornis tooth implantation and replacement. a Parasagittal view of the Ichthyornis dispar dentary fragment YPM.1775 with teeth inserted in sockets. The alveolar space is filled with sediment and there is no attachment tissue or preserved cementum around the root of the teeth. b Transverse section of the Ichthyornis dispar dentary with TI3 tooth. c Ichthyornis dispar isolated tooth (UAM_PV93.2.133_2): in lingual view, basal-apical tooth section and horizontal root section respectively from left to right, exhibiting the resorption pit. The root is resorbed there in the form of an oval scar by the new replacement tooth that was growing lingually and migrating into the functional tooth root. a, b Synchrotron x-ray microtomography, c conventional x-ray microtomography. Scale bars 0.5 mm

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