English, asked by tahurabarbhuiya1, 3 months ago

define torsion.Discuss torsion in gastropods with illustration

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Answered by rajni6944

Answer:

Torsion is a gastropod synapomorphy which occurs in all gastropods during larval development. Torsion is the rotation of the visceral mass, mantle, and shell 180˚ with respect to the head and foot of the gastropod. This rotation brings the mantle cavity and the anus to an anterior position above the head.

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