Millions of these at this marina.
Corallites growing directly on the floating dock.
Largest colony was about 10" across. On vertical sides of floating docks. Tentative ID as per "Reef Coral Identification," p. 110, which describes habitat as "shallow water areas of high sedimentation...lagoons" - like this marina.
Telestaceans - beautiful! Found on vertical sides of floating docks. ID as per "Reef Coral Identification," p. 31: "They are considered a fouling organism." Any thoughts beyond family much appreciated!
Anthozoa is a class within the phylum Cnidaria. Unlike other cnidarians, anthozoans do not have a medusa stage in their development. Instead, they release sperm and eggs that form a planula, which attaches to some substrate on which the cnidarian grows. Some anthozoans can also reproduce asexually through budding. More than 6,100 species have been described.