bio 26 - Echinoderms Sea Star, Brittle Star etc. have five...

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Unformatted text preview: Echinoderms Sea Star, Brittle Star etc. have five chambers in them. So they have 5 parts. So the overall symmetry in adult organisms is pentaradial. So some people say that they should not be classified as deuterostomes. However, we make them as deuterostomes because of their larval forms. Their larval dorms have bilateral symmetry. What do sea starts eat. Clams and bivalves. How does a sea star ever open a clam? They just suck onto a the clam and stay till clam lose energy after which it puts stomach out and predigest it and take it back into the body holothoidean - Sea starts are herbivorus. Feather star are suspension feeders. Sea cumumbers are suspension feeders. They have no circulatory or excretory or nervous system. They have an internal skeleton and its made from special cells and calcium carbonate. Chordates Traits of chordates they start with traits we do not have.- pharyngeal gill slits- Post anal tail- a notochord linear cells with fluid filled into them making them a stiff rod in the back of the...
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bio 26 - Echinoderms Sea Star, Brittle Star etc. have five...

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