1 / 14

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 .

walt
Télécharger la présentation

Echinodermata

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related