Sea Cucumber
Sea cucumbers have five strip-like ambulacral, one of the five radial areas on the under surface of echinoderms, from which the tube feet are extended and withdrawn. Areas running along the length of the body from the stone canal to the anus.
Sea cucumbers have pentaradial symmetry, the balanced distribution of duplicate body parts or shapes, however, due their shape, they have secondarily evolved a degree of bilateral symmetry, which is an organism in which has a central axis and the two side perpendicular to this axis are symmetrical.