A. Pre-torsional stage
B. $90^{\circ}$ lateral anti-clockwise torsion
C. Movement of mantle cavity & anus to the right
D. Larva with ventral flexure in exo-gastric shell
E. $90^{\circ}$ torsion clockwise - Adult stage
Choose the correct answer from the options given below:
Gastropod Torsion: Key Developmental Stages
Gastropod torsion is a complex developmental process involving the rotation of the visceral mass relative to the head and foot. Understanding the sequence of stages is crucial for identifying when torsion occurs.
Analyzing Gastropod Torsion Sequence (A, C, D, B, E)
The development indicating torsion follows a specific order:
- A. Pre-torsional stage: This is the initial phase before any rotation begins. It serves as the baseline.
- C. Movement of mantle cavity & anus to the right: This represents an early, observable consequence or sign of the torsion process starting, indicating a directional shift.
- D. Larva with ventral flexure in exo-gastric shell: This describes the larval morphology during the critical period leading up to and during torsion. The specific flexure is associated with the onset of rotational forces.
- B. $90^{\circ}$ lateral anti-clockwise torsion: This marks the primary rotational movement where the visceral mass turns counter-clockwise.
- E. $90^{\circ}$ torsion clockwise - Adult stage: This signifies the completion of the process, establishing the final adult orientation after the full rotation is achieved.
Correct Order for Torsion Occurrence
Based on the analysis of these stages, the correct sequence indicating the occurrence of torsion is:
- A. Pre-torsional stage
- C. Movement of mantle cavity & anus to the right
- D. Larva with ventral flexure in exo-gastric shell
- B. $90^{\circ}$ lateral anti-clockwise torsion
- E. $90^{\circ}$ torsion clockwise - Adult stage
Therefore, the correct option is the one listing the stages in the order A, C, D, B, E.
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Choose the correct answer from the options given below:
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