Radially symmetrical organisms
Radially symmetrical organisms may be diploblastic or triploblastic. Cnidarians, ctenophores and adult echinoderms are radially symmetrical organisms. Cnidarians and ctenophores are diploblastic in nature. Echinoderms are triploblastic in nature.
Cnidarians and and ctenophores do not possess coelom but echinoderms do.