Stylophora madagascarensis
A vulnerable, endemic stony coral of Madagascar's shallow reefs.
Stylophora madagascarensis, a stony coral from the family Pocilloporidae, lives only along Madagascar’s coasts in the tropical western Indian Ocean. It grows in shallow water, forming colonies of slender, compact branches with blunt ends, each branch up to five millimetres wide. The coral’s stony skeleton, or coenosteum, is covered in tiny spines. Its circular corallites—the cups housing the polyps—are crowded together, often hooded near branch tips, and each has six septa fused to a central, style-like columella. This species hosts symbiotic dinoflagellates in its tissues, which provide nourishment. The polyps feed at night and retract during the day. The coral is pale brown, sometimes with pinkish branch bases.
Found on moderately exposed reefs and in sheltered lagoons, it tends to develop longer branches in calmer waters. Although common around Madagascar, the International Union for Conservation of Nature lists it as “vulnerable” because local reefs are degrading so quickly that an estimated 45% of its habitat may vanish by 2050. Threats include climate change, ocean acidification, stronger storms, and rising sea temperatures, which cause bleaching and increase disease risk. Its limited range makes it more susceptible to these pressures than a widespread species.
Quick Facts
- Genus
- Stylophora
- Species
- madagascarensis
Facts from the source article.
Lore & Background
Stylophora madagascarensis forms clumps of slender, compact branches with blunt ends, each branch up to five millimetres in diameter. The corallites are crowded and circular, with those near branch tips often hooded; each has six septa fused to a central, style-like columella. The coenosteum is covered with tiny spines. This is a zooxanthellate species, harbouring symbiotic dinoflagellates that provide nourishment. Polyps expand to feed at night and retract during the day. The coral is pale brown, sometimes with pinkish branch bases.
Endemic to Madagascar, it grows in shallow water on moderately exposed reefs and in more sheltered lagoons, where branches tend to be longer. The International Union for Conservation of Nature has assessed its status as 'vulnerable' because reefs around Madagascar are being degraded at a rate estimated to cause 45% habitat loss by 2050 (three coral generations). Threats include climate change, ocean acidification, increasing storm severity, and rising seawater temperatures, which cause coral bleaching and increased disease susceptibility. Its small total population size makes it more vulnerable than a more widespread species.
Reader's Guide
Stylophora madagascarensis is significant as a zooxanthellate coral endemic to Madagascar, illustrating the interdependence of coral and symbiotic dinoflagellates. Its conservation status of 'vulnerable' highlights the acute threats facing restricted-range corals in the western Indian Ocean. The article notes that 45% of its habitat is projected to be lost by 2050 due to climate change, ocean acidification, storms, and rising temperatures—factors that cause bleaching and disease. Its small population size amplifies these risks. The species' morphology—slender branches, hooded corallites, and spiny coenosteum—distinguishes it within the Pocilloporidae. Its legacy lies in serving as a case study for the vulnerability of endemic reef corals to global environmental change, as documented by the IUCN assessment.
Did You Know?
- This coral is endemic to the coasts of Madagascar.
- Its branches are up to five millimetres in diameter.
- The polyps expand to feed at night and are retracted during the day.
Frequently Asked Questions
What is Stylophora madagascarensis?
Stylophora madagascarensis is a stony coral in the family Pocilloporidae that occurs exclusively along Madagascar's coastlines in the tropical western Indian Ocean. It builds compact colonies of slender, blunt-tipped branches in shallow reef settings.
Where can I find Stylophora madagascarensis in the wild?
This species is endemic to Madagascar, so you will not encounter it on any other coastline. It favours shallow water on both moderately exposed reef flats and the calmer waters of sheltered lagoons.
What does a Stylophora madagascarensis colony look like?
Branches are thin and compact, reaching no more than about five millimetres in diameter, with blunt tips. The stony skeleton is sprinkled with tiny spines, and the small circular corallites are packed so densely that they often form hooded clusters near branch ends, each holding a central style-like columella.
What is the conservation status of Stylophora madagascarensis?
The species is currently assessed as Vulnerable. Modelling projects that roughly 45 percent of its suitable habitat could disappear by 2050, making its long-term persistence a pressing concern.
What sets Stylophora madagascarensis apart from other pocilloporid corals?
Its strict restriction to Madagascar's shores makes it the only truly endemic member of its immediate group in the region. Combined with its unusually narrow branches, tightly crowded corallites, and the characteristic central columella in each cup, it is easy to tell apart from look-alike species.
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