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

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hydras a hydrozoan
Hydras- a Hydrozoan
  • Freshwater hydrozoan
  • Spend most of life as polyp
  • Can move with a somersaulting movement
portuguese man of war
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 bluebottlesfor the purple-blue color of their pneumatophores
slide5

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)
jellyfish
Jellyfish

Most of life is as a medusa

slide8
The sting of most jelly fish are harmless to humans, but the tiny, Australian jellyfish can kill you in 3-20 minutes.

Box jelly 

sea anemones corals
Sea Anemones & Corals
  • Only have the polyp stage
  • Most ecologically important invertebrates
  • Sea anemones are solitary polyps
clownfish and sea anemone
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
corals
Corals
  • Grow in shallow, tropical water
  • Produce skeletons of CaCO3
  • Most are colonial, creating coral reefs
  • Entire ecosystems revolve around coral reefs
slide14
Corals produce chemicals to prevent being overgrown by other organisms. Some of these chemicals have been used as anti-cancer medications