1. Phyla Porifera and Cnidaria
Free Powerpoint Templates

2. Features of Sponges Sponges depend on numerous pores or openings
They will pump water through those openings to obtain food and oxygen
Special cells called collar cells have a flagellum that moves water in and a sticky part that catches microscopic food particles

3. Structure of Sponges Sponges have skeletons that are made of:
spongin (a flexible, fibrous protein)
Spicules (stiff pointed little spikes)
Or BOTH

4. Sponges – Video

5. Where do real sponges live?
How did they clean the sponges?
Sponges are actually ________.
Sponges cannot __________ or _________.
Sponges are known as ________ feeders.
What are some predators of sponges?

6. Phylum Cnidaria

7. Features of Cnidarians
Primary support for their bodies is a jelly-like mass that fills the space between their tissues  hydrostatic skeleton

8. Tissues of Cnidarians
Have a large central cavity surrounded by 2 layers of tissues
Ectoderm (outer layer)
Endoderm (inner layer)
Gastrovascular cavity
Mouth – only opening

9. Food/Defense
God has designed cnidarians with special stinging organelles filled with venom called nematocysts
Each one has a trigger that when stimulated will release a long, whip-like barb out and inject toxic venom to whatever made it fire

10. Other Cnidarians Other cnidarians include:
Hydras
Corals
Sea anemones
Each captures prey with stinging tentacles
All have radial symmetry
Definite top and bottom
No definite sides

11. Corals
2 main groups:
Hard corals (limestone base)
Soft corals (no limestone base)
Both types have a soft body called a polyp made of 2 layers of tissue
Both have stinging tentacles for defense and finding food
Hard corals help create vast reefs throughout Earth’s oceans

13. Nematocyst in Action