The document provides an overview of several animal phyla, describing their key characteristics. It discusses the phyla Porifera, Cnidaria, Platyhelminthes, Rotifera, Nematoda, Mollusca, Annelida, Arthropoda, Echinodermata, and Chordata. For each phylum, it outlines the types of organisms included and their defining anatomical and physiological traits.

1. Chapters 33 and 34: A REVIEW

2. Phylogeny of Extant Phyla

3. Phylum Porifera

5. Choanocytes

6. Amoebocytes

7. Anatomy of Simple Sponge

8. A More Complex Sponge

9. Phylum Cnidaria

11. Cnidocytes

12. Cnidaria Anatomy

13. Class Hydrozoa

14. Class Scyphozoa

15. Class Anthozoa

16. A Cnidarian Life Cycle ( Obelia )

17. Phylum Platyhelminthes

19. Planarian Anatomy

20. Fluke Lifecycle

21. Tapeworm Anatomy

22. Phylum Rotifera

24. Phylum Nematoda

26. A Roundworm

27. Phylum Mollusca

29. Class Polyplacophora (chitons)

30. Class Gastropoda

31. Class Bivalvia

32. Class Bivalvia

33. Class Cephalopoda

34. Closed vs. Open Circulation

35. Phylum Annelida

38. Class Oligochaeta

39. Class Polychaeta

40. Class Hirudinea

41. Phylum Arthropoda

43. Subphylum Trilobita

44. Subphylum Cheliceriformes

45. Subphylum Crustacea

46. Phylum Echinodermata

49. Starfish Anatomy

50. Tube feet

51. Phylum Chordata