phylum echinodermata: sand dollars, starfish, sea urchins
DESCRIPTION
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 PresentationTRANSCRIPT
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Phylum Echinodermata:Sand Dollars, Starfish, Sea UrchinsMacKenzie Meggers
+Key Characteristics
Endoskeleton Five-part radial symmetry Water-vascular system Coelomic circulation and
respiration Protostomes (first opening is
mouth)
+Anatomy Sieve (water enters) Ring Canal Tube feet Anus Stomach Digestive Glands Skin Gills Reproductive Glands
+Digestion Two stomachs Digestive glands in each arm Enzymes absorb nutrients External Port- upper body
+Respiration Skin Gills Respiratory Gases Tube feet Oxygen from water is
distributed through the body
+Internal Transport
Simple Circulatory system Water vascular system
+Excretion No distinct organs Released through tube feet Phagocytic cells & coelomocytes
remove waste
+Response
Nervous system Brain Central nerve ring Sensitive to touch, light,
temperature, water conditions
+Movement
Water-Vascular System Tube Feet Crawl across the sea
floor
+Reproduction
Separate sexes External fertilization Larvae settle on ocean floor Gonads release gametes Asexually or sexually
+Examples
1. Sea Urchins 2. Sea Cucumber 3. Sand Dollars
+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
+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.