The hardness of the enameloid ranged from 3.0–3.8 Gpa, and the
reduced elastic modulus ranged from 67.4–77.3 GPa. The values
of hardness and reduced elastic modulus of the enameloid of I. oxyrinchus
and G. cuvier (about 6 GPa and 100 GPa, respectively) were
higher than the values reported by Whitenack et al. (2010).