1. ANIMAL DIVERSITYDIVERSITY

2. Where are We?

3. What makes an Animal? Eukaryotic Heterotrophic Multicellular Diploid Are motile at some stage of the Life Cycle

5. Evolutionary History in Development

6. Why is embryonic development important in our understanding of evolution? Evolutionary Developmental Biology (“Evo-Devo”) – Comparisons of developmental characters in different organisms can often reveal ancestral relationships – Excellent characters for use in building phylogenies Ernst Haeckel 1892

7. Development

8. Videos Development of the Blastula Gastrulation

9. Blastopore Mouth: protostomes Anus: deuterostomes

10. Triploblastic Development Protostomes (“mouth first”) Deutero stomes (“mouth second”) Blastopore= mouth Blastopore= anus

11. Body Plan: Symmetry

12. Symmetry Radial SymmetryBilateral Symmetry

13. Symmetry Practice

14. Tissues Parazoa - group of organisms without true tissues Eumetazoa - group of animals with true tissues

16. Germ Layers Diploblastic – Endoderm + ectoderm Triploblastic – Endoderm + mesoderm + ectoderm

18. Triploblastic Animals - Body Cavities

19. Red = ectoderm Yellow = endoderm Blue = mesoderm

20. Lophotrochozoa Trochophore larvae Lophophore Used for filter feeding

21. Ecdysozoa

22. Today’s Lab Work through all stations (use flowchart!) Identify unknowns in tank Show me your tree!

23. Flow Chart True Tissues? Parazoa Eumetazoa yes no Number of Germ Layers? two three Diploblastic Triploblastic Fate of blastopore? mouth anus Protostome Deuterostome Which clade? Lophotrochozoa Ecdysozoa Trochophore larvae or lochophore (or neither) ? Asymmetry Radial symmetry Bilateral symmetry Acoelomate, Pseudocoelem, or Coelem Coelom