The shell has a trapezoidal plate (1) whose upper surface (1e) and lower surface are arranged between a proximal or fixation end (2) and a distal or free end (3). The distal or free end has a border (1d) whose stop edge is raised above a plane in which the upper surface is arranged. The stop edge is formed by an extended flexible lip (4) having elastic deformation capacity. The stop edge extends in the direction of an exterior of the border. The trapezoidal plate constitutes a body of the shell. An independent claim is also included for a small fruit harvesting head comprising an articulated traversable collecting platform.