Category:Radiata

Ra`di*a"ta, n. pl. Etym: [nl., fr. radiatus, p. p. See radiate.] (zoöl.)

Defn: an extensive artificial group of invertebrates, having all the Parts arranged radially around the vertical axis of the body, and the Various organs repeated symmetrically in each ray or spheromere.

Note: it includes the coelenterates and the echinoderms. Formerly, The group was supposed to be a natural one, and was considered one of The grand divisions of the animal kingdom.