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Echinodermata

Echinodermata. By: Amanda Kelm and Monica Luebke. Echinoderm means “spiny skin” Common Name: Sea stars or star fish. Classes of Echinodermata. Asteroidea Ophiuroidea Echinoidea Crinoidea Holothuroidea. Examples. Starfish Sea Urchins . Body Symmetry .

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Echinodermata

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  1. Echinodermata By: Amanda Kelm and Monica Luebke • Echinoderm means “spiny skin” • Common Name: Sea stars or star fish

  2. Classes of Echinodermata • Asteroidea • Ophiuroidea • Echinoidea • Crinoidea • Holothuroidea

  3. Examples • Starfish • Sea Urchins

  4. Body Symmetry • Larvae —bilaterally symmetrical • Adult—radial • Body distributed around a center

  5. Body Plan • Coelomates • Have the deuterostome development mode • Radial cleavage • Formation of the anus from the blastopore • “Five Part” Body Plan • Bony endoskeleton (calcium rich plates) • Body parts are found around a “center” • The center of a sea star: contains the mouth and anus, a digestive tract that runs from the mouth to the anus, and a nerve ring that has nerve chords that extend into the arms • Have the power to regenerate lost arms • Water Vascular System • Tube Feet • Lack an excretory system

  6. Support/ Movement System • Water Vascular System • Tube Feet • Radial Canals • Ring Canal • “Suction discs” • Water is squeezed through the tube feet, causing the feet to extend forward, and creating suction. • Water Pressure • Endoskeleton with internal spines • Slow Moving

  7. Nutrition • Use tube feet to grasp prey • Enzymes produced from digestive galnds, then used in digestion • Water Vascular system aids in feeding • Class Asteriodea • Carnivores and scavengers • Class Ophiuroidea • Feed on small, dead or living things • Class Echinoidea • Sea Urchins: Algae, plants, encrusting organism • Sand Dollar: collect and gather • Class Crinoidea • Use arms in suspension feeding • Class Holothuroidea • Oral tentacles • Coelomocytes

  8. Gas Exchange Process • Numerous tiny gills that extend from surface • Water Vascular System used in respiration • Papillar—finger like projections that function as oxygen and molecular exchangeorgans

  9. Defense Mechanisms • Sea urchins point spines in direction of predator • Sea cucumbers expel internal organs to scare away predators • Secretion of sticky substance (unable to remove from skin)

  10. Excretion/Water Balance • Excrete wastes through thin walls of tube feet • Madreporite take water in • Digestive glands secrete digestive juices and aid in absorption and storage • Water Vascular System • Network of hydraulic canals branching into tube feet

  11. Reproduction • Sexual • Separate male and female individuals • External fertilization • Eggs and sperm released into water • The eggs develop into larvae and swim freely • The larvae sink to the bottom of the ocean and develop into an adult

  12. Response to Stimuli • Sensory neurons respond to • Water currents • Light • Chemicals in the water • Touch • Nerve ring around mouth • Eyespots sensitive to light • Directional Gravity senses

  13. Fun Facts • Ability to regenerate any appendage • Have nervous system, but no head or brain • Not found in freshwater or land

  14. http://www.worldbookonline.com/student/article?id=ar172980&st=echinodermatahttp://www.worldbookonline.com/student/article?id=ar172980&st=echinodermata • http://highered.mcgraw-hill.com/sites/0072437316/student_view0/chapter33/ • http://www.ebiomedia.com/prod/BOechinoderms.html • http://www.d.umn.edu/biology/courses/bio3701/Echinodermata.htm • http://library.thinkquest.org/28751/review/animals/7.html

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