Boxplot showing the distribution of the length/width ratio of metatarsal III 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 variables of this ratio were measured, exemplified in a third metatarsal of Charonosaurus
jiayinensis (CUST JV1236). Grey horizontal lines delimit character states.