Phylum Cnidaria includes jellies, anemones and coral, all of which may be found at coastal communities like Southern Hydrate Ridge, Slope Base, and the 600 m Oregon Offshore site.
Sea cucumbers (Class Holothuroidea) belong to Phylum Echinodermata. Echinoderms are common at coastal communities. These species of echinoderm were documented at Slope Base site.
Anemones and corals belong to Class Anthozoa (Phylum Cnidaria). Two species of anemones, one specie of coral, and one specie of jelly have been observed at coastal communities like Southern Hydrate Ridge.