Ectoderm Mesoderm Derivatives: connective tissue, muscle, skeleton (vertebrates only) Endoderm What is gastrulation? Movement of superficial cells to inside of Embryo What does the blastopore become in protostomes? Deuterostomes? Blastopore = anus in deuterostomes Blastopore = mouth in protostomes What are some monophyletic lingeages of early animals? Monophyletic lineages 1. Sponges (Porifera) 2. Cnidarians 3. Ctenophores (4. Bilateria) What is a synapomorphy for sponges?