science & environment•Sun, September 6, 2026•4 min read

Why This New Deep-Sea 'Golden Tree' Coral Stunned Scientists

Researchers exploring the deep Pacific off the coast of Costa Rica have discovered a bizarre, tree-like coral that is so genetically unique it requires its own biological family. This discovery highlights how little we still know about the vast ecosystems hiding on the ocean floor.

A New Chapter in Marine Biology

Deep-sea exploration is often a game of identifying the familiar, but a recent expedition near Costa Rica’s seamounts has rewritten the rulebook. Scientists operating the remotely operated vehicle (ROV) SuBastian discovered a striking, bright yellow coral that resembles a gilded tree. The organism was so genetically and morphologically distinct from known species that it couldn't be shoehorned into existing categories, necessitating the creation of an entirely new scientific family.

The mysterious golden coral, filmed at depths of over 300 meters.

Hidden in the Depths

The discovery occurred during expeditions conducted in 2019 and 2023 by the Schmidt Ocean Institute. Utilizing research vessels Falkor and Falkor (too), the team explored the waters off Isla del Coco and the Costa Rican Pacific margin. At depths between 360 and 529 meters, they encountered these golden colonies, which can reach heights of over one meter.

The coral grows in a unique tree-like structure.
It thrives at depths of 360 to 529 meters.
Initial analysis failed to match the specimen with any known taxa.
The discovery was officially published in the journal ZooKeys.

I thought the species could belong to a known family and genera, but after the preliminary morphological analysis I realised that it was something very different that I could not match with the known taxa.
— O. Breedy, Researcher

Why This Matters

This finding underscores the immense scale of the unexplored deep ocean, which covers roughly two-thirds of the planet's surface. These coral gardens are not merely aesthetic wonders; they serve as critical, structurally complex habitats for a wide range of other deep-sea life. By identifying these vulnerable marine ecosystems, researchers are better equipped to advocate for their protection as human interest in deep-sea environments continues to grow.

Key Takeaways

A unique coral species was discovered off the coast of Costa Rica during 2019 and 2023 expeditions.
The coral is so genetically distinct that scientists established a new biological family to classify it.
The colonies grow to over one meter tall and possess a vibrant, golden tree-like appearance.
The discovery highlights how much of the global ocean remains completely unexplored.
These coral colonies act as vital habitats for diverse deep-sea biodiversity.

FAQ

Where was the golden coral discovered?

It was discovered on seamounts off the coast of Costa Rica, specifically near Isla del Coco and the Pacific margin.

Why is this discovery significant?

The coral is so genetically and physically unique that it could not be classified into any existing coral family, requiring the creation of a new one.

How deep does this coral live?

The colonies were found living at depths between 360 and 529 meters below the surface.

How did researchers find it?

Scientists used the remotely operated vehicle (ROV) SuBastian while aboard the Schmidt Ocean Institute's research vessels, Falkor and Falkor (too).