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The World of Animals: Phylum Echinodermata

Related Article: Learn more about echinoderms.

Echinoderms, represented by starfish and sea urchins, live in salt water. They possess an internal framework called an endoskeleton and use tube feet for locomotion and to pry open mollusk shells.
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Science of the Sea: A Closer Look at Echinoderms

Science of the Sea: A Closer Look at Echinoderms (3:53)

All echinoderms have stiff, spiny plates on their skin.

Animals Without Backbones: Echinoderms

Animals Without Backbones: Echinoderms (1:57)

The characteristics of echinoderms are discussed in this HowStuffWorks video.

The World of Animals: Phylum Echinodermata

The World of Animals: Phylum Echinodermata (1:07)

Echinoderms, represented by starfish and sea urchins, live in salt water. They possess an internal framework called an endoskeleton and use tube feet for locomotion and to pry open mollusk shells.