FIGURE 9 in Tooth enamel microstructure in North American Phytosauria (Diapsida:Archosauriformes): Implications for biogeography and ecology of a Late Triassic clade of crocodylian-like predators

FIGURE 9. Boxplots of overall enamel thickness and enamel thickness to crown height ratio. Circles around boxplots represent outliers. 9A—Enamel thickness (μm) by tooth type. Type B teeth have the thickest enamel on average; 9B— Enamel thickness (μm) over crown height (mm) by tooth type. We included this ratio as a way to account for the overall size of teeth. Type B teeth have the thickest enamel on average, followed by type U; 9C—Enamel thickness (μm) of transverse sections by taxonomic assignment with stratigraphically oldest on the left of the plot,showing variation in enamel thickness but no chronological trend; 9D—Enamel thickness (μm) of transverse sections of type I teeth. When only considering type I teeth enamel thickness thins through time; 9E—Enamel thickness (μm) over crown height (mm) of transverse sections of type I teeth. When overall tooth size is accounted for, the opposite of Figure 9E is seen with typical enamel per mm height increasing through time.