<P> Many flowers are radially symmetric or actinomorphic . Roughly identical flower parts--petals, sepals, and stamens--occur at regular intervals around the axis of the flower, which is often the female part, with the carpel, style and stigma . </P> <P> Many viruses have radial symmetries, their coats being composed of a relatively small number of protein molecules arranged in a regular pattern to form polyhedrons, spheres, or ovoids . Most are icosahedrons . </P> <P> Tetramerism is a variant of radial symmetry found in jellyfish, which have four canals in an otherwise radial body plan . </P> <P> Pentamerism (also called pentaradial and pentagonal symmetry) means the organism is in five parts around a central axis, 72 ° apart . Among animals, only the echinoderms such as sea stars, sea urchins, and sea lilies are pentamerous as adults, with five arms arranged around the mouth . Being bilaterian animals, however, they initially develop with mirror symmetry as larvae, then gain pentaradial symmetry later . </P>

What does it mean for an animal to have bilateral symmetry how does this differ from radial symmetry