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Echinoderms

Learn about echinoderms, marine invertebrates such as starfish, sea urchins, and sea cucumbers. Discover their unique pentalateral symmetry, feeding methods, circulation, response mechanisms, excretion, movement, and respiration. Explore the different classes of echinoderms and examples within each class.

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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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