Echinoderms

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Chapter 32 Echinoderms
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32-1 Echinoderms
Phylum Echinodermata
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starfish, brittle stars, sea dollars, and sea
cucumbers
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Echinoderms share 4 Major characteristics
Endoskeleton 5 part Radial Symmetry Water
Vascular System Coelomic Circulation System
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Endoskeleton made of movable plates with spines
The individual Plates are Called Ossicles
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penta-radial symmetry
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• Two-sided
• bottom oral surface
• top aboral surface

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Water-vascular System
water taken in to extend foot water removed to
contract foot and form suction
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Habitat
marine (shallow and deep) live on ocean floor
(except sea cucumber)
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• Nervous System
• nerve ring and radial nerves
• light-sensitive eyes

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Reproduction sexes separate sexual
reproduction can regenerate
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Brittle Stars
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Sea Lilies
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Feather Stars
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Sea Urchins
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Sand Dollars
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Sea Cucumbers
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THE END