+

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.