Description: English: Reef Coral Skeleton(Pectinia alcicorns). Credit: Carl C. Hansen (Smithsonian Institution)Español: Colonia de Pectinia alcicornis. Date: 29 November 2004, 12:19:15. Source: https://www.flickr.com/photos/publicresourceorg/493802042/in/photostream/. Author: Carl C. Hansen.