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Phylogenetic relationships of species included within the dataset, based on the phylogeny published by Upham et al.72; see alsoFigure S3andTables S1. Timescale is in millions of years. Representatives of major clades, demonstrating the range of cranial morphological diversity, are shown in the lateral view from top to bottom for the following:Setonix brachyurus,Bradypus tridactylus,Setifer setosus,Sapajus apella,Phacochoerus africanus, andOrnithorhynchus anatinus. Developmental strategy for each species is indicated by color; see alsoTable S1.

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