Turbinaria (coral)


Turbinaria is a genus of colonial stony corals in the family Dendrophylliidae. Common names for this genus include disc coral, scroll coral, cup coral, vase coral, pagoda coral and ruffled ridge coral. These corals are native to the Red Sea, Indian Ocean, Japan and the south Central Pacific Ocean.

Characteristics

Members of this genus may be massive, laminar, columnar or foliaceous, but foliaceous is the most common form. They may form plates, discs or tiered structures, usually with the corallites only on one surface. The corallites have porous walls and may be sunk into the surrounding coenosteum, or form tubular raised mounds. The septa are short and arranged neatly and the columella is broad. The coenosteum is dense and heavy. Most species are nocturnal, with the polyps expanding only at night, but Turbinaria peltata is an exception to this.

Ecology

Members of this genus are hermatypic corals. They are zooxanthellate, meaning that they contain symbiotic photosynthetic protists in their tissues, and are found in shallow waters where sunshine penetrates. They are one of only three genera in the family Dendrophylliidae with this capability, the other genera being azooxanthellate and found in deeper waters.
The crown-of-thorns starfish has been causing much damage to many species of coral in the Indo-Pacific region but Turbinaria sp. are seldom attacked.

Conservation status

The conservation status of several species in this genus is listed by the International Union for Conservation of Nature as "vulnerable". Like other corals, the main threats they face are climate change and ocean acidification. Rising sea water temperatures causes stress to the corals resulting in bleaching events and greater incidence of coral disease, and ocean acidification puts at risk their calcium carbonate skeletal structure. Storms seem to be increasing in severity and fishing activities can also damage reefs. Other threats include tourism, pollution, sedimentation and the introduction of alien species. Population trend statistics have not been gathered for individual species, but the general decline in coral reef habitat is used as a proxy for population decline in these corals.

Use in aquaria

Turbinaria spp. are sometimes kept in reef aquaria. They are hardy corals that are non-aggressive, and do best in well-lit conditions with moderate to high water movement.

Species

The following species are listed by the World Register of Marine Species: