Interesting Cnidarians. Hydras- a Hydrozoan Freshwater hydrozoan Spend most of life as polyp…
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Transcript of Interesting Cnidarians. Hydras- a Hydrozoan Freshwater hydrozoan Spend most of life as polyp…
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Interesting Cnidarians
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Hydras- a Hydrozoan
Freshwater hydrozoan Spend most of life as
polyp Can move with a
somersaulting movement
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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
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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)
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JellyfishMost of life is as a medusa
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The sting of most jelly fish are harmless to humans, but the tiny, Australian jellyfish can kill you in 3-20 minutes.
Box jelly
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Sea Anemones & Corals
Only have the polyp stage
Most ecologically important invertebrates
Sea anemones are solitary polyps
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Sea anemones
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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
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Corals
Grow in shallow, tropical water
Produce skeletons of CaCO3
Most are colonial, creating coral reefs
Entire ecosystems revolve around coral reefs
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Coral reefs also protect the land from the ocean swells and waves
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Corals produce chemicals to prevent being overgrown by other organisms. Some of these chemicals have been used as anti-cancer medications