A, boxplot showing the distribution of the depth/length ratio of the predentary in
a sample of iguanodontoidean taxa. B, Bayesian information criterion (BIC) for various numbersof clusters
in which the data can be classified. C, Predentary of Gryposaurus notabilis (CMN 2278) showing how the
depth and length of this bone were measured. Grey horizontal lines delimit character states.