The 180^$\circ$,counterclockwise twisting of the visceral mass,mantle,and mantle cavity of gastropods is called

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Torsion is the 180-degree counterclockwise twisting of the visceral mass, mantle, and mantle cavity of gastropods during development. Contortion, helixing, and coiling are not specific to gastropods, and operculating refers to the closing of the operculum, which is not related to torsion.

The 180 ∘\circ∘ ,counterclockwise Twisting of the Visceral Mass,mantle,and Mantle Cavity of Gastropods

The 180^$\circ$,counterclockwise Twisting of the Visceral Mass,mantle,and Mantle Cavity of Gastropods