Bivariate plot between two axes of the NMMDS analysis of a GDA dissimilarity matrix of the geometry of the
postacetabular process of the ilium. Each dot is surrounded by the outline of the preacetabular process of the specimen that it represents.
Colors indicate the following groups: green = non-hadrosaurid Iguanodontoidea; blue = non-lambeosaurine Hadrosauridae; red = Lambeosaurinae;
yellow = Hadrosauridae indeterminate. The inserted smaller plot shows the Bayesian Information Criterion (BIC) for various numbers of clusters in which the data may be classified. Abbreviations in the BIC plot are as in Fig. F.4.