1. Chapter 33

2. The Ancestors Protists: Choanoflagellates

3. The Ancestors Colonies of choanoflagellates

4. The Ancestors Colonies of choanoflagellates

5. Porifera – The Sponges

6. Sessile filter feeder Grouped based on “skeleton” type. Can form gemmules for protection.

7. Porifera – The Sponges Asymmetrical No tissue layers.

8. Porifera – The Sponges Sexual reproduction - hermaphrodites Can grow whole new sponges if cut in pieces

9. Cnidaria Examples: jellyfish, anemones, hydra and coral

10. Cnidaria Named for cnidocytes

11. Cnidaria Diploblastic Two body forms: polyp & medusa Grouped based on amount of life spent as polyp or medusa

12. Cnidaria Reproduces asexually by budding.

13. Cnidaria

14. Platyhelminthes - Flatworms Examples: planaria, liver flukes, tapeworms

15. Platyhelminthes - Flatworms Most are parasitic

16. Platyhelminthes - Flatworms Bilateral symmetry Simplest phylum with a head Simple organ systems Reproduce sexually and asexually

17. Platyhelminthes - Flatworms Acoelomates Triploblastic

18. Rotifera Named for feeding rotors Pseudocoelomates Have an anus! Images from http://www.microscopy-uk.org.uk

19. Rotifera Usually reproduces by parthenogenesis

20. Nematoda – Roundworms Found in most aquatic habitats, soil, and in plant and animal tissues

21. Nematoda – Roundworms Many are parasitic – hookworms, roundworms, pin worms, heartworms, etc.

22. Nematoda – Roundworms Pseudocoelomates Simple organs

23. Annelida – Segmented Worms Examples: earthworms, fireworms, leeches

24. Annelida – Segmented Worms “Little rings” –repeating segments, some specialized Coelomates Setae Parapodia

25. Annelida – Segmented Worms Fairly complex anatomy

26. Mollusca Largest classes: Gastropods Bivalves Cephalopods

27. Mollusca Muscular foot

28. Mollusca Head

29. Mollusca Visceral mass

30. Arthropoda “Jointed foot”

31. Arthropoda Most successful animal phyla – 67% of all species!

32. Arthropoda Four main groups: Cheliceriforms Myriapods Hexapods Crustaceans

33. Arthropoda Exoskeleton - ecdysis

34. Arthropoda Open circulatory system

35. Arthropoda Tracheal tubes Spiracles vs. book lungs

36. Arthropoda Malpighian tubules

37. Echinodermata “Spiny skin”

38. Echinodermata Radial symmetry

39. Echinodermata Water vascular system Tube feet

40. Echinodermata No head or brain Simple anatomy Deuterostomes Endoskeleton