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Table 1 Parameters of tooth growth measured and calculated from dentine increment lines in sections of teeth of Hesperornis and comparative specimens

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

  YPM.1206.B TMP TMP TMP
  Hesperornis regalis 1989.103.0025 Richardoestesia isosceles 1986.052.0054 “Aves indet.” 1986.030.0039 “Aves indet.”
Mean tooth formation duration (days) 66 74 62 88
Angle I (°) 91.6 95.46 100.23 107.3
Angle D (°) 3.68 7.16 8.4 5.6
d = DSR (daily secretion rate) (μm/day) 3.1 3.5 3.5 3.1
Tooth extension rate at the cervix level (μm/day) 48.2 28.06 23.9 31.1