NOAA Scientists Identify Golden Orb as Deep-Sea Anemone Remnant

Context In 2023, a NOAA remotely operated vehicle captured images of a smooth, dome‑shaped golden object attached to a rock at a depth exceeding 3,200 meters. Initial guesses ranged from an egg case to a sponge fragment, sparking public curiosity. The specimen was retrieved and sent to the Smithsonian Institution’s National Museum of Natural History for further study.

Key Facts Researchers used morphological examination to note the object’s texture and attachment point, then extracted DNA for barcoding. When the first barcode proved inconclusive, they performed whole‑genome sequencing, revealing animal DNA with a strong signal from Relicanthus daphneae. Mitochondrial genome comparison showed greater than 99 % identity to a reference sequence of that anemone. The effort required zoologists, geneticists, deep‑sea biologists, and bioinformaticians working together for nearly three years.

What It Means The result confirms that the golden orb is not an unknown life form but a structural remnant—the basal disc—of Relicanthus daphneae, the part that anchors the anemone to hard substrate. This finding adds to the limited knowledge of deep‑sea cnidarian biology and demonstrates how combining traditional taxonomy with modern genomics can resolve enigmatic specimens. Continued exploration of the Gulf of Alaska and similar habitats may uncover more cryptic structures that clarify deep‑sea ecosystem functions. Watch for upcoming NOAA expeditions that will target unexplored seafloor ridges, aiming to link such biological remnants to broader patterns of biodiversity and geochemical cycling.