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Echinoderms
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Spiny skin Radial symmetry Water vascular system
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Form and Function Water vascular- respiration, circulation, movement.
Madreporite- connects the ring canal to the outside.
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Tube feet- movement. Feeding- sea stars push out stomach and enzymes break down shells. Excretion- cellular through tube feet(ammonia), solid through anus. External fert.
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Groups of Echinoderms
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Sea Urchins and Sand Dollars
Large solid plates Most eat algae
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Brittle Stars Found on coral reefs Can shed an arm to escape
Found on coral reefs Can shed an arm to escape Filter feeders
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Sea Cucumbers “ Moving pickles” Detritus feeders
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Sea Stars Most are carnivores Eat bivalves Can repair themselves
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Sea Lilies and Feather Stars
Filter feeders Live in the tropics
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Feather Star (Note the depth)
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