1. The Characteristics of Phylum Cnidaria

2. Characteristics of Phylum Cnidaria n n radial symmetry n n blind sac gut ( = coelenteron or gastrovascular cavity ) n n diploblastic with mesoglea n n polyp and medusa body forms n n nematocysts ( = specialized stinging capsules ) n n nerve net n n lack excretory, circulatory & respiratory systems n n complex life cycle n n many colonial forms exhibiting polymorphism n n radial symmetry n n blind sac gut ( = coelenteron or gastrovascular cavity ) n n diploblastic with mesoglea n n polyp and medusa body forms n n nematocysts ( = specialized stinging capsules ) n n nerve net n n lack excretory, circulatory & respiratory systems n n complex life cycle n n many colonial forms exhibiting polymorphism

3. Radial Symmetry aboral oral

4. Radial Symmetry Jellyfish Phylum Cnidaria

5. Characteristics of Phylum Cnidaria radial symmetry blind sac gut ( = coelenteron or gastrovascular cavity ) diploblastic with mesoglea polyp and medusa body forms nematocysts ( = specialized stinging capsules ) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism radial symmetry blind sac gut ( = coelenteron or gastrovascular cavity ) diploblastic with mesoglea polyp and medusa body forms nematocysts ( = specialized stinging capsules ) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism

6. Blind Sac Gut

7. Characteristics of Phylum Cnidaria radial symmetry blind sac gut ( = coelenteron or gastrovascular cavity ) diploblastic with mesoglea polyp and medusa body forms nematocysts ( = specialized stinging capsules ) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism radial symmetry blind sac gut ( = coelenteron or gastrovascular cavity ) diploblastic with mesoglea polyp and medusa body forms nematocysts ( = specialized stinging capsules ) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism

8. Diploblastic- two germ layers Phylum Cnidaria

9. Characteristics of Phylum Cnidaria radial symmetry blind sac gut ( = coelenteron or gastrovascular cavity ) diploblastic with mesoglea polyp and medusa body forms nematocysts ( = specialized stinging capsules ) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism radial symmetry blind sac gut ( = coelenteron or gastrovascular cavity ) diploblastic with mesoglea polyp and medusa body forms nematocysts ( = specialized stinging capsules ) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism

10. Nematocysts

11. Nematocyst Picture Nematocyst

12. More Nematocysts http://www.youtube.com/watch?NR=1&v=- Tp38DUjUnM&feature=endscreen

13. Characteristics of Phylum Cnidaria radial symmetry blind sac gut ( = coelenteron or gastrovascular cavity ) diploblastic with mesoglea polyp and medusa body forms nematocysts ( = specialized stinging capsules ) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism radial symmetry blind sac gut ( = coelenteron or gastrovascular cavity ) diploblastic with mesoglea polyp and medusa body forms nematocysts ( = specialized stinging capsules ) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism

14. Nerve Net

15. Characteristics of Phylum Cnidaria radial symmetry blind sac gut ( = coelenteron or gastrovascular cavity ) diploblastic with mesoglea polyp and medusa body forms nematocysts ( = specialized stinging capsules ) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism radial symmetry blind sac gut ( = coelenteron or gastrovascular cavity ) diploblastic with mesoglea polyp and medusa body forms nematocysts ( = specialized stinging capsules ) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism

16. Diffusion Across the Body Wall

17. Sea Anemones

18. Circulation in a Moon Jellyfish

19. Characteristics of Phylum Cnidaria radial symmetry blind sac gut ( = coelenteron or gastrovascular cavity ) diploblastic with mesoglea polyp and medusa body forms nematocysts ( = specialized stinging capsules ) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism radial symmetry blind sac gut ( = coelenteron or gastrovascular cavity ) diploblastic with mesoglea polyp and medusa body forms nematocysts ( = specialized stinging capsules ) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism

20. The Cnidarian Life Cycle

21. Characteristics of Phylum Cnidaria radial symmetry blind sac gut ( = coelenteron or gastrovascular cavity ) diploblastic with mesoglea polyp and medusa body forms nematocysts ( = specialized stinging capsules ) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism radial symmetry blind sac gut ( = coelenteron or gastrovascular cavity ) diploblastic with mesoglea polyp and medusa body forms nematocysts ( = specialized stinging capsules ) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism

22. Coloniality and Polymorphism

23. Poly,orphism in the Portuguese Man- of-War

24. Coloniality Coral Phylum Cnidaria