1. Phylum Cnidaria

2. Find the similarities….

3. Stinging tentacles surrounding circular mouth Radial symmetry
Soft Bodies
Stinging tentacles surrounding circular mouth
Radial symmetry
Only one opening (mouth)
Leads to GV cavity
Most live in the sea

4. Compare the two shapes
Polyp
Medusa

5. Some interesting pictures…

7. Three Classes Class Hydrozoa: ex. Fire corals, Hydra,
Portuguese man-o-war
The most diverse group
Have dominant polyp OR medusa stage

8. Class Scyphozoa ex. True Jellyfish >200 species All marine
Free-swimming, dominant medusa stage

9. Class Anthozoa ex. Corals, sea anemones, sea pens
>2700 species (mostly marine)
Alternate between polyp and medusa phase