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Echinoderms

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  1. Echinoderms By Kyler, Jeffrey and Ayden

  2. Description • a marine invertebrate of the phylum Echinodermata, such as a starfish, sea urchin, or sea cucumber.

  3. Symmetry of Echinoderms • Evolved from bilateral symmetry • Larvae look like embryonic chordates • In adulthood, possess pentalateral symmetry (five sided)

  4. Method of Feeding • Heterotrophs • Possess several methods • May be carnivorous or herbivorous

  5. Circulation Open circulatory system Network of fluid filled canals Tube feet

  6. Response • Cellular response and a humoral one. • Fixes problems

  7. Excretion Uses its Water Vascular System to flush out any waste substances They have no organs for direct excretion

  8. Movement • Have many tube feet on each of their “arms” • Expanding and contracting certain chambers in the water system • Moves water into certain feet which makes it move

  9. Respiration • Exchanges carbon dioxide for oxygen • Tube is surface for respiration

  10. Classes and Examples • Divided into five extant classes https://www.shapeoflife.org/video/echinoderms-ultimate-animal • Asteroidea (starfish) • Ophiuroidea (brittle stars) • Echinoidea (sea urchin and sand dollars) • Crinoidea (sea lilies or feather stars) • Holothuroidea (sea cucumbers)

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