A radially symmetrical diploblastic animal is
Roundworm
Earthworm
Hydra
Liver fluke
Radially symmetrical: The body parts are arranged around the central axis such that the body has a top and bottom surface but no left, or right or front or back. Such a body can be equally divided into two equal halves along any plane. For example, coelenterates and ctenophores.
So coelenterates (Hydra) and ctenophores are radially symmetrical