Boxplot showing the distribution of the orientation of the dentary symphysis relative to the lateral wall
of the element 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 Brachylophosaurus canadensis (MOR 1071-7-15-98-226). Grey horizontal lines delimit character states.