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Phylum Echinodermata: Sand Dollars, Starfish, Sea Urchins

Phylum Echinodermata: Sand Dollars, Starfish, Sea Urchins. MacKenzie Meggers. Key Characteristics . Endoskeleton Five-part r adial symmetry Water-vascular system Coelomic circulation and respiration Protostomes (first opening is mouth). Anatomy. Sieve (water enters) Ring Canal

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Phylum Echinodermata: Sand Dollars, Starfish, Sea Urchins

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  1. Phylum Echinodermata:Sand Dollars, Starfish, Sea Urchins MacKenzie Meggers

  2. Key Characteristics • Endoskeleton • Five-part radial symmetry • Water-vascular system • Coelomic circulation and respiration • Protostomes (first opening is mouth)

  3. Anatomy • Sieve (water enters) • Ring Canal • Tube feet • Anus • Stomach • Digestive Glands • Skin Gills • Reproductive Glands

  4. Digestion • Two stomachs • Digestive glands in each arm • Enzymes absorb nutrients • External Port- upper body

  5. Respiration • Skin Gills • Respiratory Gases • Tube feet • Oxygen from water is distributed through the body

  6. Internal Transport • Simple Circulatory system • Water vascular system

  7. Excretion • No distinct organs • Released through tube feet • Phagocytic cells & coelomocytes remove waste

  8. Response • Nervous system • Brain • Central nerve ring • Sensitive to touch, light, temperature, water conditions

  9. Movement • Water-Vascular System • Tube Feet • Crawl across the sea floor

  10. Reproduction • Separate sexes • External fertilization • Larvae settle on ocean floor • Gonads release gametes • Asexually or sexually

  11. Examples • 1. Sea Urchins 2. Sea Cucumber 3. Sand Dollars

  12. Facts • 7,000 living species, 13,000 extinct species • Largest phylum w/o freshwater • Found in all oceans • Mostly a marine group • Can live up to 10 years

  13. Literature Cited • "Animal Diversity Web." ADW: Echinodermata: INFORMATION. National Science Foundation, 2005. Web. 20 Feb. 2013. • Raven, Peter H., and George B. Johnson. Biology. Boston: McGraw-Hill, 2002. Print • "Digestive System of the Starfish." Holly Thurgood, n.d. Web. • ‘Starfish." Wikipedia. Wikimedia Foundation, 14 Mar. 2013. Web. 17 Mar. 2013. • "Starfish Digestion and Circulation." Starfish Digestion and Circulation. N.p., 10 May 2000. Web. 17 Mar. 2013. • "Echinodermata." N.p., n.d. Web. 17 Mar. 2013. • "Starfish (Sea Stars)." About.com Marine Life. Jennifer Kennedy, n.d. Web. 17 Mar. 2013.

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