Gastropod Torsion and Larval Development
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Questions and Answers

What is the primary characteristic feature of gastropods during their larval stage?

  • Ability to undergo coiling
  • Process of torsion (correct)
  • Presence of bilateral symmetry
  • Development of a complex nervous system
  • What happens to the position of the anus during the process of torsion in gastropods?

  • It moves backwards
  • It remains stationary
  • It shifts upwards near the mouth (correct)
  • It rotates 90 degrees to the right
  • During torsion, how does the mantle cavity change its position?

  • It remains unchanged throughout development
  • It moves from anterior to posterior
  • It rotates to align with the shell coiling
  • It shifts from a posterior to an anterior position (correct)
  • What is the duration range for the torsion process in gastropods?

    <p>15–30 minutes (D)</p> Signup and view all the answers

    What results from the unequal growth of the visceral mass in gastropods during torsion?

    <p>Twisting and repositioning of internal organs (C)</p> Signup and view all the answers

    What is a potential outcome concerning organ functionality during torsion?

    <p>One side may degenerate while the opposite side remains functional (B)</p> Signup and view all the answers

    How does torsion differ from shell coiling in gastropods?

    <p>Torsion occurs prior to the onset of shell coiling (D)</p> Signup and view all the answers

    What structural change occurs to the auricle during torsion in gastropods?

    <p>It shifts to a position in front of the ventricle (B)</p> Signup and view all the answers

    Flashcards

    Torsion

    The twisting of the visceral mass and mantle of a gastropod larva by 180 degrees, resulting in a change in the position of internal organs.

    When does torsion occur?

    The process of torsion occurs during the larval stage of gastropods, typically completed within 15-30 minutes.

    What happens to the anus during torsion?

    The anus, originally at the back, shifts forward and upwards, ending up near the mouth.

    Where does the mantle cavity end up?

    The mantle cavity, which was behind the body, moves forward to an anterior position after torsion.

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    What happens to the auricle during torsion?

    The auricle, a heart structure, moves to a position in front of the ventricle.

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    How does torsion affect the shell?

    The development of a spirally wound shell is caused by the unequal growth of the visceral mass during torsion.

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    Torsion vs. Coiling

    Torsion is distinct from coiling of the shell. Torsion happens first, and is a rapid process.

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    Unequal development during torsion

    During torsion, one side of organs may degenerate, while the other side remains functional. This leads to asymmetry in the adult gastropod.

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