(Phylum Echinodermata) - Part 9 (_/13)

Phylum Echinodermata

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What does Echinodermata mean and examples?

“Spiny skin".

Examples: Starfish, sea urchin, sand dollar.

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Where do echinoderms live?

Marine environments (oceans).

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Adult echinoderms symmetry?

They have five-part radial symmetry.

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Echinoderm larvae symmetry?

They have bilateral symmetry (mirror-image left and right halves).

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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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Skeleton type of echinoderms?

Endoskeleton (internal skeleton made of calcium plates called ossicles).

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Skeleton made of what?

Calcium carbonate plates (ossicles).

Phylum Echinodermata

1

Unique echinoderm system?

The water vascular system (helps echinoderms move, feed, and breathe).

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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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What structure does water enter through in a starfish?

Water enters the madreporite and helps move the tube feet.

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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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Where is starfish mouth?

Ventral center (its underside).

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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.