Coelomate-deuterostomes - Coelomate- Deuterostomes A....

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Coelomate- Deuterostomes A. Phylum: Echinodermata (“spiny skin”)- characteristics 1. Deuterostomes: blastophore → anus 2. Marine 3. Bilateral symmetry a. larvae- bilateral symmetry b. adults- pentaradial 4. Ciliated epidermis- projections from endoderm 5. water vascular system a b d e c f e a. madreporite b. stone canal c. ring canal d. radial canal- through arms e. tube foot f. ampulla- vascular bulb, contracted force water in tube foot g. sucker- grabs prey
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6. Examples a. class: Crinoidea- “feather stars” (free swimming) or “sea lilies” (sessile) - highly branched arms- wave around in water to catch food b. class: Asteroidea- “sea stars” - body i. central disk with 5-20 arms ii. endoskeleton- series of calcareous plates (for movement) iii. pedicellaria- small, pincer-like spines, used to keep surface clean iv. carnivorous v. regeneration- as long as a piece of central disc is intact, will regenerate c. class: Ophiuroidea- “brittle stars” - body i. arms are more slender, longer, and more flexible
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This note was uploaded on 04/07/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.

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Coelomate-deuterostomes - Coelomate- Deuterostomes A....

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