Figure 6

Size distributions of the oncocerids on M1 and M2 as histograms and Kernel-smoothed density estimates. (a) length of the specimens and (b) widths of the specimens. Because of the conical shape of the specimens, a skewed distribution is to be expected in the length of the specimens. The width distribution is nearly symmetrical, thus showing no sign of a sexual size dimorphism. Note that the size of a specimen strongly depends on the position of the erosional surface.