Phylum Echinodermata
Phylum Echinodermata
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What does Echinodermata mean and examples?
“Spiny skin".
Examples: Starfish, sea urchin, sand dollar.
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Unique echinoderm system?
The water vascular system (helps echinoderms move, feed, and breathe).
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Where do echinoderms live?
Marine environments (oceans).
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Function of tube feet, + what is it?
It's small, water-powered feet on echinoderms like starfish used for movement and gas exchange.
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Adult echinoderms symmetry?
They have five-part radial symmetry.
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What structure does water enter through in a starfish?
Water enters the madreporite and helps move the tube feet.
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Echinoderm larvae symmetry?
They have bilateral symmetry (mirror-image left and right halves).
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What are ampullae?
small bulb-like sacs connected to the tube feet in echinoderms. They squeeze water into the tube feet, causing the tube feet to extend.
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Are echinoderms coelomate?
Yes, they have a coelom (the body wall between digestive system and internal organs).
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Where is starfish mouth?
Ventral center (its underside).
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Skeleton type of echinoderms?
Endoskeleton (internal skeleton made of calcium plates called ossicles).
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How do starfish feed on clams?
Starfish pry open clams with tube feet and digest them by turning their stomach outward.
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Skeleton made of what?
Calcium carbonate plates (ossicles).