In which group of molluscs is torsion a very | vedclass

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(A) In $Gastropod$ molluscs, the early embryo is symmetrical with an anterior mouth and a posterior anus. However, during development, the visceral ma

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Gastropods

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(A) In $Gastropod$ molluscs, the early embryo is symmetrical with an anterior mouth and a posterior anus. However, during development, the visceral mass rotates $180^{\circ}$ relative to the head and foot, bringing the anus near the mouth; this process is known as torsion. As a result, the adult $Gastropod$ becomes asymmetrical.

In which group of molluscs is torsion a very important event in the life history?

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