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echinoderm |
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echinodermMarine invertebrate of the phylum Echinodermata (‘spiny-skinned’), characterized by a five-radial symmetry. Echinoderms have a water-vascular system which transports substances around the body. They include starfishes (or sea stars), brittle-stars, sea lilies, sea urchins, and sea cucumbers. The skeleton is external, made of a series of limy plates. Echinoderms generally move by using tube-feet, small water-filled sacs that can be protruded or pulled back to the body. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Beckstrom, have written a just-released book titled The Starfish and the Spider: The Unstoppable Power of Leaderless Organizations (Portfolio), in which they hold forth on not only the model of the Apache tribes ("The Apaches persevered because they were decentralized") to, yes, echinoderms and arachnids. Complete echinoderms are very rare because their skeletons were readily broken up after death. In the end, the researchers used 77 animals, including fish, echinoderms, crustaceans, and mollusks. |
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