In total, 22 species of coral are now protected under the Endangered Species Act, including the two corals (elkhorn and staghorn) listed as threatened in 2006. Fifteen of the newly listed species occur in the Indo-Pacific and five in the Caribbean (see table below). None are found in Hawaii.
Protecting and conserving biologically diverse coral reefs is essential. The Endangered Species Act gives us some important tools to conserve and recover those corals most in need of protection. The final decision to list these 20 corals is a result of the most extensive rulemaking ever undertaken by NOAA. The amount of scientific information sought, obtained, and analyzed was unprecedented. This information included general reef-building coral biology, habitat characteristics and threats, as well as species-specific spatial, demographic, and other information for the individual coral species in the final rule.
Read more at http://www.fisheries.noaa.gov/stories/2014/08/corals_listing.html