1. Interesting Cnidarians

2. Hydras- a Hydrozoan  Freshwater hydrozoan  Spend most of life as polyp  Can move with a somersaulting movement

4. Portuguese Man-Of-War  A type of hydrozoan that grows in a colony  One of the polyps (pneumatophore) becomes a float to keep the colony on the surface  also known as bluebottles for the purple-blue color of their pneumatophores

5.  They may produce very long tentacles(up to 50m)  the poison in the nematocysts is very strong and causes humans great pain (but rarely deadly)

7. Jellyfish Most of life is as a medusa

8.  The sting of most jelly fish are harmless to humans, but the tiny, Australian jellyfish can kill you in 3-20 minutes. Box jelly 

9. Sea Anemones & Corals  Only have the polyp stage  Most ecologically important invertebrates  Sea anemones are solitary polyps

10. Sea anemones

11. Clownfish and Sea Anemone – Symbiotic relationship sea anemone receives protection from polyp-eating predators, like Butterfly Fish, which the clown fish chases away. the anemone also gets fertilizer from the feces of the Clown Fish tentacles protect clown fish from its predators

12. Corals  Grow in shallow, tropical water  Produce skeletons of CaCO 3  Most are colonial, creating coral reefs  Entire ecosystems revolve around coral reefs

13.  Coral reefs also protect the land from the ocean swells and waves

14.  Corals produce chemicals to prevent being overgrown by other organisms. Some of these chemicals have been used as anti-cancer medications