phylum echinodermata: sand dollars, starfish, sea urchins

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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 - PowerPoint PPT Presentation


Phylum Echinodermata Sand Dollars, Starfish, Sea Urchins

Phylum Echinodermata:Sand Dollars, Starfish, Sea UrchinsMacKenzie Meggers

+Key Characteristics EndoskeletonFive-part radial symmetry Water-vascular systemCoelomic circulation and respiration Protostomes (first opening is mouth)

+AnatomySieve (water enters) Ring CanalTube feetAnusStomachDigestive GlandsSkin GillsReproductive Glands


Two stomachsDigestive glands in each armEnzymes absorb nutrientsExternal Port- upper body


Skin GillsRespiratory GasesTube feetOxygen from water is distributed through the body

+Internal Transport

Simple Circulatory systemWater vascular system

+Excretion No distinct organsReleased through tube feetPhagocytic cells & coelomocytes remove waste


Nervous systemBrainCentral nerve ringSensitive to touch, light, temperature, water conditions

+MovementWater-Vascular SystemTube FeetCrawl across the sea floor

+ReproductionSeparate sexesExternal fertilizationLarvae settle on ocean floor Gonads release gametes Asexually or sexually

+Examples1. Sea Urchins2. Sea Cucumber 3. Sand Dollars

+Facts 7,000 living species, 13,000 extinct speciesLargest phylum w/o freshwaterFound in all oceansMostly a marine groupCan live up to 10 years

+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 (SeaStars)." Marine Life. Jennifer Kennedy, n.d. Web. 17 Mar. 2013.



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