name two phyla of animals that are radially symmetrical
Symmetry in biology Symmetry has been important historically in the taxonomy of animals; Georges Cuvier classified animals with radial symmetry in the taxon Radiata (Zoophytes),[1][2] which is now generally accepted to be a polyphyletic assemblage of different phyla of the Animal kingdom.[3] Most radially symmetric animals are symmetrical about an axis extending from the center of the oral surface, which contains the mouth, to the center of the opposite, aboral, end. Radial symmetry is especially suitable for sessile animals such as the sea anemone, floating animals such as jellyfish, and slow moving organisms such as starfish. Animals in the phyla Cnidaria and Echinodermata are radially symmetric,[4] although many sea anemones and some corals have bilateral symmetry defined by a single structure, the siphonoglyph.[5]
Centriole In cell biology a centriole is a cylindrical cell structure[1] composed mainly of a protein called tubulin that is found in most eukaryotic cells. An associated pair of centrioles, surrounded by a shapeless mass of dense material, called the pericentriolar material, or PCM, makes up a compound structure called a centrosome.[1]