Boxplot showing the distribution of the ratio between the breadth of the supraacetabular process along
its dorsal region and the craniocaudal length of the central iliac plate from the caudal ischial peduncle to the pubic peduncle, 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
a right ilium of Prosaurolophus maximus (MOR 787). Grey horizontal lines delimit character states.