twisting of visceral mass at 180 in asymmetrical mollusk is
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This process of twisting of visceral mass in gastropods during their larval stages is termed as Torsion.
By the end of torsion the symmetrical gastropod changes into an asymmetrical gastropod by changes in the visceral mass and mantle cavity.
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Torsion is the rotation of the visceral mass and foot 180 degrees with respect to the head and foot, and is a unique synapomorphy of modern gastropods. Torsion occurs during development in all gastropods, usually in the late veliger stage. ... The mantle and anus of the gastropod are moved to the anterior position ...
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