[Cubo-/Scyphomedusae] Symmetry in which any diameter bisects the object into two identical halves. In many scyphomedusae, despite the arrangement of the radial canals the bell can be just so divided along any diameter: the division does not have to be along a radial canal. In cubomedusae, which have four radial canals, the symmetry is said to be tetraradiate; and though this is conceptually different it is also radial symmetry since any diameter will still produce identical halves. Many scyphomedusae have eight radial canals, and the term octoradiate symmetry can be applied. In bilateral symmetry there is only one plane along which the structure can be cut to produce two mirror-image halves. See also perradial.