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Echinodermata

Echinodermata. Amber Yin. Class: Echinoidea. Class: Holothuroidea. Commom Echinodermata Classes:. Class: Asteroidea. The Water-Vascular System. - Water is shifted to different parts of the body in order to move (one part grips, as another releases).

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Echinodermata

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  1. Echinodermata Amber Yin

  2. Class: Echinoidea Class: Holothuroidea CommomEchinodermata Classes: Class: Asteroidea

  3. The Water-Vascular System - Water is shifted to different parts of the body in order to move (one part grips, as another releases) • Sea water enters the madreporite. It is then circulated from the stone canal to the ring canal and into the radial canals. The radial canals carry water to the ampullae and provide suction to the tube feet.

  4. Tube Feet of a Starfish

  5. The Digestive System • Two stomachs (one inside the body, and another that can come out) • Digestion outside of the body allows them to devour prey larger than its mouth • Have no teeth so they must turn their food into liquid • Excretions exit through the anus

  6. Respiratory System • Oxygen is diffused either into the papulae (bumps on the aborsal side) or into the tube feet • Instead of blood, the ocean water is the starfish’s circulatory liquid

  7. Nervous System • They have no brain • Instead of having a centralized nervous system, the starfish has a set in each arm • They use their arms for touching and tasting. • They have eye spots located on the tips of their legs that are light sensitive • Starfish have a nerve ring around their central disk that extends down each leg • Sensitive sense of smell

  8. Self-Defense/Healing Power • Starfish are able to regenerate lost limbs • Sea urchins have poison stored in their hollow spines • Sea cucumbers “eviscerate” meaning they can spew out all of their organs at predators, and then they can also regenerate those lost organs

  9. Sea Cucumber’s Defense Mechanism

  10. Works Cited "Invertebrate Nervous System." Washington.edu. 27 Oct. 2008 <http:faculty.washington.edu/chudler/invert.html>. "More about the Starfish." Aquascope. 27 Oct. 2008 <http://www.vattenkikaren.gu.se/fakta/arter/echinode/asteroid/asterube/asteru1e.html>. "Phylum Echinodermata." Animaldiversity.edu. Umich. 27 Oct. 2008 <http://animaldiversity.ummz.umich.edu/siteaccounts/information/echinodermata.html>. "Starfish." 2008. 27 Oct. 2008 <http://science.jrank.org/pages/6450/starfish.html>. "Starfish." Wikipedia.org. 26 Oct. 2008. 27 Oct. 2008 <http://en.wikipedia.org/wiki/starfish>.

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