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Boxplot showing the distribution of the height/width ratio of dentary tooth crowns in a sample of iguanodontoidean taxa. The inserted smaller graph shows the Bayesian information criterion (BIC) for various numbers of clusters in which these data can be classified. The upper photograph shows how this ratio was measured, exemplified in the dental battery of Edmontosaurus annectens (MOR 003). Grey horizontal lines delimit character states.

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