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Echinoderms

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by

Jane LaMay

on 23 April 2010

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Transcript of Echinoderms

Echinoderms Echinoderms are invertebrates with an internal skeleton and a system of fluid-filled tubes called a water vascular system. The skin of most echinoderms is stretched over an internal skelton There are four major groups of echinoderms: sea stars, brittle stars, sea urchins, and sea cucumbers. SEA STARS They are predators that eat mollusks, crabs and other echinoderms They use their tubed feet to move and capture prey. BRITTEL STARS They have long arms with flexible joints. They have tubed feet but do not have suction cups. They use
their tubed feet to catching food not to move. They slither along the ocean floor to move. SEA URCHINS They have no arms. Moveable spines cover and protect their body. They kind of look like a porkipine To move they have bands of tubed feet that extend out between spines. They scrape and cut their food. SEA CUCUMBERS They look like cucumbers and can be red, brown, blue or green. Underneath their bodies there is rows of tubed feet makes them able to move slowly along the ocean floor were they live. They are fliter feeders and can lengthen tentacles to sweep food toward its mouth.
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