In biology, radial symmetry is a property of some multicellular organisms. Any cut through the center of a radially symmetric organism, with the plane of the cut going from the top to the bottom (dorsal to ventral), results in roughly equal halves in terms of organs and body parts. For example, wedding cakes exhibit radial symmetry. Main articles: Life All organisms (viruses not included) consist of cells, which in turn, are based on a common carbon-based biochemistry. ... The word dorsal can refer to many different things. ... In zootomy, several terms are used to describe the location of organs and other structures in the body of bilateral animals. ... Square with symmetry group D4 Symmetry is a characteristic of geometrical shapes, equations, and other objects; we say that such an object is symmetric with respect to a given operation if this operation, when applied to the object, does not appear to change it. ...

Organisms with radial symmetry only have a single orientation: dorsal-ventral (or anterior-posterior, there is no differentiation). Organisms with bilateral symmetry, on the other hand, have two orientations: dorsal-ventral, as well as anterior-posterior. Cnidaria and ctenophores are the only animals with true radial symmetry. Echinoderms (e.g. sea urchins and starfish) possess a variant of radial symmetry in which orientations of 72° rotation are considered equivalent; this is known as pentamerism. In biology, bilateral symmetry is a characteristic of multicellular organisms, particularly animals. ... Classes Anthozoa - Corals and sea anemones Cubozoa - Sea wasps or box jellyfish Hydrozoa - Hydroids, hydra-like animals Scyphozoa - Jellyfish Cnidaria (from New Latin cnida nematocyst, fr. ... Classes Tentaculata Nuda Ctenophores are jellyfish-like animals commonly called comb jellies, sea gooseberries, sea walnuts, or Venus girdles. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria Placozoa Subregnum Bilateria  Acoelomorpha  Orthonectida  Rhombozoa  Myxozoa  Superphylum Deuterostomia     Chordata (vertebrates, etc. ... Classes Asteroidea Concentricycloidea Crinoidea Echinoidea Holothuroidea Ophiuroidea Echinoderms (Echinodermata) is a phylum of marine animals found in the ocean at all depths. ... Slate pencil urchin (cidaroid) Group of black, long-spined Caribbean sea urchins, Diadema antillarum (Philippi) Sea urchin roe. ... NON TECHNICAL AND OF LOW INTELLIGENCE COMPUTER USER CALLING TECH SUPPORT. SEE S.E.C.S. ALSO This page is a candidate for speedy deletion. ... In biology, pentamerism, also known as pentaradial symmetry, is a unique body symmetry exhibited primarily by starfish. ...