Porites is a genus of stony coral; they are SPS (Small Polyp
Stony) corals. They are characterised by a finger-like
morphology. Members of this genus have widely spaced calices, a
well-developed wall reticulum and are bilaterally symmetrical.
Porites, particularly Porites lutea, often form
microatolls.Corals of the genus Porites also often serve as
hosts for christmas tree worms (Spirobranchus giganteus).
Specimens of Porites are sometimes available for purchase in the
aquarium trade. Most Porites that are collected have Christmas
tree worms (Spirobranchus giganteus) that bore into the coral,
serving as additional aesthetic livestock. These particular
Porites specimens are called "christmas tree worm rocks" or
"christmas tree worm coral". However, due to the strict water
quality, lighting and dietary requirements, keeping Porites in
captivity is very difficult. - WoRMS (2010). "Porites Link,
1807". World Register of Marine Species.
http://www.marinespecies.org/aphia.php?p=taxdetails&id=206485.
Retrieved 2011-