Explain the significance of torsion in gastropods
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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.
Significance
The Adaptive Significance of Gastropod Torsion. Theories which explain torsion in gastropods are critically evaluated. ... The theory of Garstang, that torsion protected the larval head and velum, is unsatisfactory because it provides no adaptive intermediates and must rely on a saltation.
Significance
The Adaptive Significance of Gastropod Torsion. Theories which explain torsion in gastropods are critically evaluated. ... The theory of Garstang, that torsion protected the larval head and velum, is unsatisfactory because it provides no adaptive intermediates and must rely on a saltation.
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