Fig. 15.
Deformation generated by a moving garden snail on the surface of the substrate in the animal's direction of motion (longitudinal). (A) Two-dimensional contour map of the longitudinal deformation as a function of the longitudinal (x) and transversal (y) spatial coordinates. Red, the animal is deforming the gel towards the right of the panel underneath the head and tail; blue, the animal is deforming the gel towards the left of the panel under the interwaves. (B) Longitudinal deformation along the centerline of the ventral foot (ucenterline) as a function of x. In both panels, the origin of the coordinate system is located at the intersection between the centerline of the ventral foot and the head of the animal. The black undulating pattern and the black horizontal line have been included to indicate the position of the waves and interwaves relative to the peaks and valleys of the deformation field.