Echinodermata Characteristics Quiz
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Questions and Answers

Which of the following are characteristics of Echinodermata? (Select all that apply)

  • Radially symmetrical adult bodies (correct)
  • Freshwater species
  • Five part body plan (correct)
  • Deuterostomes (correct)

    • What are ossicles?

    Calcareous plates that make up an Echinoderm's internal skeleton.

    Who is in the phylum Echinodermata?

    Sea stars, sea urchins, sand dollars, and sea cucumbers.

    What does the word Echinoderm mean?

    <p>Echino means spiny and derm means skin.</p> Signup and view all the answers

    How are the five classes of Echinoderms primarily distinguished?

    <p>By the arrangement of their ossicles.</p> Signup and view all the answers

    What are dermal gills?

    <p>Small finger-like projections of skin that aid in respiration and excretion.</p> Signup and view all the answers

    What are pedicellariae?

    <p>Numerous tiny pincers that help keep the body surface free of foreign objects.</p> Signup and view all the answers

    What is a madreporite?

    <p>An opening used to filter water into the water vascular system.</p> Signup and view all the answers

    What is an ambulacral groove?

    <p>A channel along the oral surface of Echinoderms through which the tube feet protrude.</p> Signup and view all the answers

    What is an ambulacral ridge?

    <p>Located at the apex of the ambulacral groove; the radial canal lies along the ridge.</p> Signup and view all the answers

    What organisms belong to class Asteroidea?

    <p>Sea stars.</p> Signup and view all the answers

    What are the characteristics of spines in class Asteroidea?

    <p>Small and blunt.</p> Signup and view all the answers

    What can you see in the oral view of a sea star?

    <p>Tube foot, arm, spines, mouth, and ambulacral groove.</p> Signup and view all the answers

    What can you see in the aboral view of a sea star?

    <p>Arms, anus, spines, central disk, madreporite.</p> Signup and view all the answers

    What type of symmetry does the bipinnaria larval stage of a starfish demonstrate?

    <p>Bilaterally symmetrical.</p> Signup and view all the answers

    Who is in class Ophiuroidea?

    <p>Brittle stars.</p> Signup and view all the answers

    Who is in class Crinoidea?

    <p>Sea lilies and feather stars.</p> Signup and view all the answers

    Who is in class Echinoidea?

    <p>Sea urchins and sand dollars.</p> Signup and view all the answers

    What is a test?

    <p>Ossicles fused into a solid shell.</p> Signup and view all the answers

    What is Aristotle's lantern?

    <p>A 'jaw' in sea urchins composed of five ossified plates or teeth.</p> Signup and view all the answers

    Is the sea urchin's test pentaradially symmetrical?

    <p>True</p> Signup and view all the answers

    What does pentaradially symmetrical mean?

    <p>The five-part radial symmetry characteristic of adult echinoderms.</p> Signup and view all the answers

    Who is in class Holothuroidea?

    <p>Sea cucumbers.</p> Signup and view all the answers

    What is evisceration in sea cucumbers?

    <p>Forceful expulsion of the internal viscera.</p> Signup and view all the answers

    What do some sea cucumbers do in response to stress?

    <p>They undergo evisceration.</p> Signup and view all the answers

    What is the water vascular system?

    <p>A system of canals in echinoderms containing a circulating watery fluid.</p> Signup and view all the answers

    Study Notes

    Characteristics of Echinodermata

    • Echinoderms are classified as deuterostomes, exhibiting unique developmental patterns.
    • Adults feature radial symmetry, with a five-part body plan.
    • Internal skeletons are composed of calcareous ossicles.
    • A water vascular system facilitates movement through tube feet.
    • Notable for regeneration abilities, all members are exclusively marine.

    Ossicles

    • Ossicles are calcareous plates forming the internal skeleton of echinoderms, providing structural support.

    Phylum Members

    • Common members of Echinodermata include sea stars, sea urchins, sand dollars, and sea cucumbers.

    Etymology

    • The term "Echinoderm" derives from Greek, with "echino" meaning spiny and "derm" meaning skin.

    Classification of Echinoderms

    • The five classes of echinoderms are distinguished by the arrangement of their ossicles.

    Dermal Gills

    • Dermal gills are small projections that assist in respiration and excretion through diffusion.

    Pedicellariae

    • Tiny pincers called pedicellariae maintain the body surface cleanliness by removing debris.

    Madreporite

    • The madreporite is an opening that filters water into the echinoderms' water vascular system.

    Ambulacral Structures

    • An ambulacral groove is a channel on the oral side where tube feet extend.
    • The ambulacral ridge lies at the top of the groove, harboring the radial canals.

    Class Specifics

    • Class Asteroidea includes sea stars, characterized by small, blunt spines.
    • In oral view, sea stars display tube feet, arms, spines, mouth, and ambulacral groove.
    • Aboral view shows arms, anus, spines, central disk, and madreporite.

    Larval Symmetry

    • The bipinnaria larval stage of sea stars exhibits bilateral symmetry.

    Other Classes

    • Class Ophiuroidea consists of brittle stars.
    • Class Crinoidea includes sea lilies and feather stars.
    • Class Echinoidea comprises sea urchins and sand dollars.
    • The test in echinoids is a solid structure formed by fused ossicles.

    Noteworthy Structures

    • Aristotle's lantern refers to sea urchins' oral apparatus for grazing; it consists of five ossified plates.
    • The sea urchin's test exhibits pentaradial symmetry characteristic of adult echinoderms.

    Class Holothuroidea

    • Sea cucumbers belong to this class and have unique adaptations.

    Evisceration

    • Evisceration is a defense mechanism in sea cucumbers involving the forceful expulsion of internal organs.

    Water Vascular System

    • This system comprises canals filled with a watery fluid, enabling tentacle and tube foot movement.

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    Description

    Test your knowledge on the unique features of Echinodermata through this engaging quiz. Explore the defining characteristics, structures like ossicles, and the members of this fascinating phylum. Perfect for students and enthusiasts alike!

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