Deep-sea corals are solitary and colonial suspension-feeding cnidarians commonly associated with seamounts around the world. They are important components of seamount ecology, providing food and refuge for numerous associated species of fish, crabs, shrimp, and sea stars at depths where few other habitat formers live (50–6000 m). Deep-sea corals are a rich assemblage in their own right, a paraphyletic taxonomic group (derived from several ancestors) of more than 3300 species of azooxanthellate stony corals (Figure 1; Scleractinia) and soft corals (Figure 2; Octocorallia) (Cairns, 2007).

Etnoyer, P.J. 2010. Box 7: Deep-sea corals on seamounts. Oceanography 23(1):128–129, https://doi.org/10.5670/oceanog.2010.91.

Adkins, J.F., H. Cheng, E.A. Boyle, E.R.M. Druffel, and R.L. Edwards. 2008. Deep-sea coral evidence for rapid change in ventilation of the deep North Atlantic 15,400 years ago. Science 280(5364):725–728, https://doi.org/10.1126/science.280.5364.725.
1. Cairns, S.D. 2007. Deep-water corals: An overview with special reference to diversity and distribution of deep-water scleractinian corals. Bulletin of Marine Science 81(3):311–322.
2. Cohen, A.L., and M. Holcomb. 2009. Why corals care about ocean acidification: Uncovering the mechanism. Oceanography 22(4):118–127.
3. Druffel, E.R.M., S. Griffin, A. Witter, E. Nelson, J. Southon, M. Kashgarian, and J. Vogel. 1995. Gerardia: Bristlecone Pine of the deep-sea? Geochimica et Cosmochimica Acta 59(23):5,031–5,036.
4. Etnoyer, P.J. 2008. A new species of Isidella bamboo coral (Octocorallia: Alcyonacea: Isididae) from Northeast Pacific seamounts. Proceedings of the Biological Society of Washington 121(4):541–553. 
5. Roark, E., T. Guilderson, R. Dunbar, S. Fallon, and D. Mucciarone. 2009. Extreme longevity in proteinaceous deep-sea corals. Proceedings of the National Academy of Sciences of the United States of America 106(13):5,204–5,208, https://doi.org/10.1073/pnas.0810875106.
6. Robinson, L.F., J.F. Adkins, D.S. Scheirer, D.P. Fernandez, A. Gagnon, and R.G. Waller. 2007. Deep-sea scleractinian coral age and depth distributions in the Northwest Atlantic for the last 225,000 years. Bulletin of Marine Science 81(3):371–391.

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