Historical reference: Do not rely on this information. It is very old. About this collection
Radiata, a term once used for one of the four principal divisions of the Invertebrates; it included those in which the parts are arranged radially from a centre instead of being bilaterally symmetrical. It therefore comprised the Coelenterata (Corals, Jellyfish, Sea-anemones, etc.) and the Echinodermata (Sea-urchins, Starfish, Brittle-stars, etc.). The classification, however, has now been abandoned, as the Coelenterata and Echinoderms are not closely allied.