Podcast
Questions and Answers
What is the primary characteristic feature of gastropods during their larval stage?
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?
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?
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?
What is the duration range for the torsion process in gastropods?
What results from the unequal growth of the visceral mass in gastropods during torsion?
What results from the unequal growth of the visceral mass in gastropods during torsion?
What is a potential outcome concerning organ functionality during torsion?
What is a potential outcome concerning organ functionality during torsion?
How does torsion differ from shell coiling in gastropods?
How does torsion differ from shell coiling in gastropods?
What structural change occurs to the auricle during torsion in gastropods?
What structural change occurs to the auricle during torsion in gastropods?
Flashcards
Torsion
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?
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?
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?
Where does the mantle cavity end up?
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What happens to the auricle during torsion?
What happens to the auricle during torsion?
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How does torsion affect the shell?
How does torsion affect the shell?
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Torsion vs. Coiling
Torsion vs. Coiling
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Unequal development during torsion
Unequal development during torsion
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