Boxplot showing the distribution of the angle between the lateral surface and the caudoventral region of the lateral side of the dentary for a sample of iguanodontoidean taxa. 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 this character was measured, exemplified in
a dentary of Maiasaura peeblesorum (YPM-PU 22405). Grey horizontal lines delimit character states.