辐射对称动物（学名Radiata）与两侧对称动物(Bilateria)共同组成真后生动物(Eumetazoa)。

这些动物的外形为球形或桶形。

辐射对称动物身体由两层胚层构成。中间有一中胶层(Mesogloea)。

Radiata is a taxonomic rank that has been used to classify radially symmetric animals. The term Radiata has united several different groupings of animals, some of which do not form a monophyletic group under current views of animal phylogeny. Because of this and problems of homoplasy associated with using body symmetry as a phylogenetic character, the term is used mostly in a historical context.