1. Phylum Cnidaria Classes: 1. Coral- Anthozoa 2. Hydra- Hydrozoa
3. Sea Jellies/ Jellyfish- Scyphozoa
4. Sea Anemones- Anthozoa
subclass Hexacorallia

2. Body Structure A. Polymorphism = more than one body form 1. Polyp
2. Medusa

3. Polyp Coral polyp Tube with tentacles around the mouth Sessile
“Juvenile” Form
Coral polyp

4. Polyp (sea anemone)

5. Medusa Umbrella shape Tentacles around mouth Motile, Free-swimming
“Adult” Form

6. Tentacles Discharged nematocyst Have nematocysts (stinging cells)
Coiled thread discharges
like a harpoon
Contains neurotoxin
Paralyzes prey
Discharged nematocyst

7. Habitat
A. Aquatic 1. Most Marine 2. Few fresh-water

8. Feeding
A. Carnivores (predators) B. Process of feeding 1. Tentacles sting prey with nematocysts 2. Tentacles grab prey 3. Prey pulled into mouth
Lion’s mane eats another jelly

9. Lion’s mane jellyfish

10. Ecological Role Predators and prey Neurotoxins in medical research
Coral – jewelry, building, reefs (surfing!)
Coral reefs - habitat for many
-great biodiversity
- protect coastline
E. Symbiosis with other organisms

11. Clown fish & eggs with sea anemone

12. Class Anthozoa: Corals

13. Class: Anthozoa Subclass Hexacorallia

14. Class- Hydrazoa

15. Class Scyphozoa