Radial symmetry is a type of symmetry where an organism can be divided into similar halves by more than two planes passing through the central axis. This type of symmetry is found in organisms that tend to meet their environment in all directions, such as aquatic animals.

1. Hemichordata : Adult organisms in this phylum, which includes acorn worms, pterobranchs, and graptolites, exhibit bilateral symmetry. This means they can be divided into two identical halves only along a single plane. Hence, radial symmetry is not found in the adults of this phylum.

2. Coelenterata (also known as Cnidaria) : This phylum includes jellyfish, sea anemones, and corals. They exhibit radial symmetry. So, radial symmetry is found in this phylum.

3. Echinodermata : Adult organisms in this phylum, which includes starfish, sea urchins, and sea cucumbers, exhibit radial symmetry. However, it's important to note that their larvae exhibit bilateral symmetry. Therefore, radial symmetry is found in adults of this phylum.

4. Ctenophora (also known as comb jellies) : These marine animals also exhibit radial symmetry. Thus, radial symmetry is found in this phylum.