Plate Nº 30 · recorded November 14, 2026
Biology & EvolutionReported finding
Twelve Overlooked Great Barrier Reef Corals Regain Species Status
Genomic sequencing and century-old museum specimens reveal 12 Great Barrier Reef corals long treated as variants are distinct species, reshaping reef conservation.
By Priya Raman3 min read658 words
In brief
- 12 corals previously treated as synonyms were restored to species status
- Researchers reassessed 53 named Acropora species and confirmed 47 as distinct
- The study was published in Invertebrate Systematics (2026), DOI: 10.1071/is26023
- The research was led by Dr. Augustine Crosbie of James Cook University and Queensland Museum
- Four previously unresolved species were also recognized as valid
Twelve corals of the Great Barrier Reef, dismissed for decades as mere variants of other species, have been restored to full species status following a genomic reassessment led by Dr. Augustine Crosbie of James Cook University and Queensland Museum.
The study, published in the journal Invertebrate Systematics, examined 53 named species of Acropora — the group of reef-building corals that includes branching staghorns and flat table-forming colonies. Of those, the researchers confirmed 47 as distinct. Twelve species previously treated as synonyms (alternative names for species already described) were resurrected, and four previously unresolved species were recognized as valid.
"Many of these corals have been known to science for more than a century, but distinct species had been misinterpreted and treated as variants of other coral species," Crosbie said. "By connecting the original museum specimens with modern corals and genomic data, we have been able to get a much clearer picture of the diversity and identity of corals on the Great Barrier Reef."
Why were these species overlooked?
For decades, coral scientists have struggled to tell whether differences in the shape and structure of a colony signal a separate species, or simply reflect one species growing under different environmental conditions. Two colonies of the same coral can look strikingly unlike each other on different parts of a reef.
The research team approached the problem through Queensland Museum's CoralBank project, an international collaboration on Australia's east coast. The work combined modern genomic sequencing — reading the DNA of living corals to compare them genetically — with historical museum specimens, including 40 species originally described from Australia's east coast.
How do you sequence a century-old skeleton?
A central obstacle shaped the study's design. Many of the historical type specimens (the original museum specimens on which a species' name formally rests) consist only of preserved coral skeletons, which cannot be sequenced directly.
To bridge that gap, researchers collected living corals from the same locations where the species were originally described, then linked those modern samples and their genomic data to the historical collections. The approach effectively allowed old skeletons to speak through the DNA of their living relatives.
Why does the distinction matter for conservation?
Queensland Museum principal scientist of marine biodiversity and James Cook University associate professor Peter Cowman said recognizing distinct species was critical to protecting coral biodiversity.
"A coral that appears to be common and widespread may actually represent several species, each with a much smaller geographic range," Cowman said. "That matters when we assess extinction risk, monitor reef communities and decide where conservation resources should be directed."
In other words, a species believed to span an entire reef system may in fact be several narrower-ranging species, each more vulnerable than earlier assessments suggested.
Queensland Museum CEO Renai Grace said the findings underscored the enduring value of museum collections. "Scientific discovery is an evolving journey and the extensive coral collections at Queensland Museum represent decades of extraordinary, painstaking study that first defined how we understand reef species," Grace said.
Senior co-author Andrew Baird, an adjunct professor of marine ecology at James Cook University, noted that the results carry weight precisely because of how intensively the reef has been studied.
"The Great Barrier Reef is one of the best-studied ecosystems on Earth, yet we are still discovering that we have underestimated the number of coral species living there," Baird said. "Knowing which species are present is fundamental to understanding, monitoring and protecting the reef's biodiversity."
The findings remain a first word rather than a final one. Taxonomy (the science of classifying species) continues to evolve as genomic tools improve, and further collections may refine the picture again. For now, twelve corals that science had folded away for a century have their names back.
The study is published as Augustine J. Crosbie et al., "On the nominal species of Acropora (Scleractinia: Acroporidae) described from eastern Australia," Invertebrate Systematics (2026), DOI: 10.1071/is26023.
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Senior reporter covering people, launches and day-to-day practice in general science news at SciBeat.
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