1. ECHINODERMS By: Emily Parker and Emma Cribbs

2. WHAT IS AN ECHINODERM? Echinoderms are invertebrates that have radial symmetry, a spiny skin, a water vascular system, and a simple nervous system. "Boundless - Textbooks." Boundless. N.p., n.d. Web. 01 Oct. 2015..

3. HABITAT/ FACTS  Strictly marine organisms  No freshwater or terrestrial  Referred to as “spiny skinned”  Greek “echinos” (“spiny”)  Greek “dermos” (“skin”) "Boundless - Textbooks." Boundless. N.p., n.d. Web. 01 Oct. 2015.. "Sea+lilies - Google Search." Sea+lilies - Google Search. N.p., n.d. Web. 02 Oct. 2015..

4. SYMMETRY/ LOCOMOTION  Radial Symmetry, circular pattern  Use tube feet to crawl and hold on to certain objects  Tube feet are extendable tubes with suction cups on the ends

5. THE 5 MAIN CLASSES  Asteroidea  Ophiuroidea  Echinoidea  Crinoidea  Holothuroidea "Boundless - Textbooks." Boundless. N.p., n.d. Web. 01 Oct. 2015..

6. ASTEROIDEA  Sea Stars  1,800+ species  Large variety of shapes, colors, & sizes  Thick arms that extend from central disk "Boundless - Textbooks." Boundless. N.p., n.d. Web. 01 Oct. 2015..

7. OPHIUROIDEA  Brittle, Basket, & Snake Stars  Long and thin arms that extend from central disk  Brittle Stars: 5 arms  Snake Stars: 5 arms  Basket Stars: repeatedly branched arms "Boundless - Textbooks." Boundless. N.p., n.d. Web. 01 Oct. 2015.. Snake Stars. N.d. Images. Web. 01 Oct. 2015..

8. ECHINOIDEA  Sea urchins & Sand dollars  Do not have any arms  Hemispherical (flattened)  5 rows of tube feet "Boundless - Textbooks." Boundless. N.p., n.d. Web. 01 Oct. 2015..

9. CRINOIDEA  Sea lilies (Feather Stars)  Mouth on top surface  Surrounded by feeding arms  Can live in shallow or deep water  Found in depths of 6,000 meters "Boundless - Textbooks." Boundless. N.p., n.d. Web. 01 Oct. 2015.. "Sea+lilies - Google Search." Sea+lilies - Google Search. N.p., n.d. Web. 02 Oct. 2015..

10. HOLOTHUROIDEA  Sea Cumbers  Also have an endoskeleton  “Functional” bilateral symmetry (Adults)  Lie horizontally not vertically (other Echinoderms) "Boundless - Textbooks." Boundless. N.p., n.d. Web. 01 Oct. 2015..

11. BODY SYSTEMS AND FUNCTIONS Sea Lilies. N.d. Sea Lilies - Google Search. Web. 02 Oct. 2015..

12. NERVOUS SYSTEM  Nerve ring in the center  5 radial nerves  Does not have brain like structure  Have eye spots which detect light  Have sensory cells that support and maintain the skeleton "Echinoderms." Echinoderms. N.p., n.d. Web. 25 Sept. 2015..

13. DIGESTIVE SYSTEM  Mostly carnivorous  Have mouth, esophagus, stomach, intestine, rectum, and anus.  One way digestive system "Echinoderms." Echinoderms. N.p., n.d. Web. 25 Sept. 2015..

14. EXCRETORY SYSTEM  Use diffusion to rid the body of nitrogenous waste  Podcytes -Cells used for filtration of bodily fluids  Podcytes are connected by a system of canals  Madreporite -Opening used to filter water into the WVS Echinoderms." Echinoderms. N.p., n.d. Web. 25 Sept. 2015..

15. WATER VASCULAR SYSTEM  Consists of a central ring canal and radial canals  Water circulates through and aids in gas exchange  Also aids in predation, locomotion, and nutrition  Madreporite is a key factor in the system Water Vascular System. N.d. Vascular System of a Starfish - Google Search. Web. 30 Sept. 2015..

16. CIRCULATORY SYSTEM  Open circulatory system  Network of fluid, found near center of body  Don’t have a true heart and blood  Tissues of body are surrounded by blood  Contains a central ring and tube feet that stretch along the body. "Respiratory System." Respiratory System of Echinoderms. N.p., n.d. Web. 30 Sept. 2015..

17. RESPIRATORY SYSTEM  Use diffusion/ osmosis  Use simple gills  Tube feet take in oxygen and pass out carbon dioxide "Respiratory System." Respiratory System of Echinoderms. N.p., n.d. Web. 30 Sept. 2015..

18. SKELETAL SYSTEM  Endoskeleton  Ossicles -calcerous elements that embedded in the body cell - Provides protection "Endoskeletal System." Support+or+skeletal+system+of+starfish - Google Search. N.p., n.d. Web. 30 Sept. 2015. <https://www.google.com/search?q=support%2Bor%2Bskeletal%2Bsystem%2Bof%2Bstarfish&espv=2&biw=1137&bih=505&site=webhp&source=lnms&tbm=isch&sa=X&ved=0CAYQ_AUoAWoVChMI9uqDw_ieyAIVChY-

19. REPRODUCTIVE SYSTEM  Two sexes in echinoderms  Each release egg and sperm  Reproduce sexually, fertilization is external  Can reproduce asexually by regeneration  Each arm has a gonad (sex organ) Reproductive System. N.d. Reproductive System Starfish - Google Search. Web. 01 Oct. 2015..

20. BODY STRUCTURE "Echinoderms." Echinoderms. N.p., n.d. Web. 25 Sept. 2015..