1. Porifera
The sponges

2. Sponges No true tissue Asymmetrical (some are radial)
Four specialized cell types
Choanocytes- feeding, water movement
Pinacocytes- covering cells
Porocytes- control water flow
Amoebocytes- transfer food, gametes, immunity, make mesohyle, spicules, gemmules

3. Traditional Phylogeny

8. Sponge types

9. Sponge Anatomy

10. Scypha sp.

11. Scypha

16. 10 9 2 1 12 3 5 7 8 6 4

17. Gemmules

18. Sponge Ciliated larvae

19. Cnidarians Hydrozoa – Hydras Scyphozoa – Sea Jellies , “ Jelly fish”
Anthozoa- Sea Anemones

20. Cnidarians Diploboastic – Gastrodermis - Epidermis Radial Symmetry
Cnidocytes- Nematocysts
Polyp – Medusa

21. Polyp Medusa
Oral
Aboral
Oral
Aboral

22. Cnidocytes

23. Symmetry

24. Hydra nutrition

25. Cnidarian circulation

26. Simple Nervous net

27. Hydra sp.

29. Cross section

30. Nematocysts

31. Female Male

32. Obelia

33. Hydranth
Gonangium
Medusa
Buds
Ceonosarc
Gonotheca

34. Perisarc
Hypostome
Hydrotheca
Ceonosarc

35. Obelia sp. life cycle

38. Obelia sp. medusae