Orbicella annularis
Most studied and abundant reef-building coral in the Caribbean.
Orbicella annularis, commonly known as the Boulder star coral, is a species of coral that lives in the western Atlantic Ocean. It is the most thoroughly studied and most abundant species of reef-building coral in the Caribbean to date, and also has a comprehensive fossil record within the Caribbean.
Quick Facts
- Taxon
- Orbicella annularis
Facts from the source article.
Lore & Background
Orbicella annularis has long been considered a generalist species that exists at depths between 0 and 80 metres. It grows into varying colony shapes—heads, columns, plates—in response to differing light conditions. Only recently, with the help of molecular techniques, has O. annularis been shown to be a complex of at least three separate species: O. annularis, O. faveolata, and O. franksi. This coral was originally described as Montastraea annularis.
Reader's Guide
Orbicella annularis is notable as the most thoroughly studied and most abundant species of reef-building coral in the Caribbean. Its comprehensive fossil record within the Caribbean provides a deep historical context for understanding reef ecosystems. The recent molecular discovery that it is a complex of at least three separate species—O. annularis, O. faveolata, and O. franksi—has reshaped taxonomic understanding. This finding underscores the importance of molecular techniques in resolving species boundaries that were previously obscured by morphological plasticity. The coral's ability to grow into varying colony shapes (heads, columns, plates) in response to light conditions highlights its adaptive generalist nature. Its original description as Montastraea annularis reflects earlier taxonomic frameworks. The species' depth range from 0 to 80 metres indicates its broad ecological niche. As the most abundant Caribbean reef-builder, it plays a foundational role in reef structure and biodiversity, though the article does not specify its conservation status or threats.
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