Corals are described as solitary if they grow as isolated individuals. These individuals are called polyps. For more information on polyps and their characteristics read the article Coral Individual – The Polyp. An individual may have more than one mouth (e.g. Ctenactis, p. 24 of the Coral Finder). If a coral grows as separate individuals, the term solitary is also used to describe the life form (see below) of the coral.
Solitary free living ↔ Solitary attached
Solitary corals may be either free-living or attached, or both at different times in their lives (e.g. p.24-25 in the Coral Finder). The corals may be round, oval or elongate. Note that it is possible for solitary polyps to have many mouths.