Boxplot showing the distribution of the ratio between the length and the width of the iliac peduncle of the
ischium 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 inchium of Charonosaurus jiayinensis (CUST JV679). Horizontal lines delimit character states.