Synchrotron imaging of dentition provides insights into the biology of Hesperornis and Ichthyornis, the "last" toothed birds.

If this attests to a tendency toward reduction of enamel cover among crownward ornithurines, it might be significant that the Maastricht tooth hereafter assigned to Ichthyornithiformes exhibits a greatly reduced enamel covering, with enamel entirely absent from the basal part of the crown.

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