ENEndangeredPartial review

Boulder Star Coral

Orbicella annularis

At a glance

IUCN category
EN · Endangered
Animal group
Invertebrates
Population trend
Decreasing
Last verified

Conservation overview

Boulder star coral is a major reef-building coral that forms large mounds on Caribbean reefs. It is assessed as Endangered.

Like all corals it is a colony of tiny animals living with symbiotic algae.

Range & habitat

Caribbean and western Atlantic reefs.

Major threats

Threats below are drawn from the authoritative sources listed on this page. For the current, complete assessment, see the IUCN Red List.

  • Warming-driven bleaching
  • Coral disease
  • Pollution and reef degradation

Why it matters

A key Caribbean reef-builder hit hard by bleaching and disease, boulder star coral is central to the wider reef crisis and to coral-restoration efforts.

Sources

Sources for Boulder Star Coral

Frequently Asked Questions

Is boulder star coral one animal or many?
It is a colony of many tiny coral polyps building a shared stony skeleton, hosting symbiotic algae that provide much of its colour and energy.
Why is boulder star coral Endangered?
Published assessments cite warming-driven bleaching, coral disease, and pollution and reef degradation. See the IUCN Red List for the current assessment.

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