PrefaceAcknowledgments1: Over the Ice for Ontogeny and Phylogeny 2: Metazoan Phyla and Body Plans3: Deep Time and Metazoan Origins4: Molecular Phylogeny: Dissecting the Metazoan Radiation5: Recovering Data from the Past6: The Developmental Basis of Body Plans7: Building Similar Animals in Different Ways8: It's Not All Heterochrony 9: Developmental Constraints10: Modularity, Dissociation, and Co-option11: Opportunistic Genomes 12: Evolving New Body PlansReferencesIndex