Boxplot showing the distribution of the a ratio between the depth of the proximal region of the preacetabular
process and the dorsoventral distance between the pubic peduncle and the dorsal margin of the ilium for a sample of iguanodontoidean ornithopods.
The inserted smaller graph shows the Bayesian information criterion (BIC) for various numbers of clusters in which the data can be classified.
The photograph shows how the two variable of this ratio were measured, exemplified in an ilium of Prosaurolophus maximus (ROM 787).
Horizontal lines delimit character states.