A strange “golden orb” found miles underwater in Alaska has been identified as part of a giant sea anemone—solved using morphology, spirocysts, and whole-genome sequencing.
A golden orb sighted thousands of feet underwater has a new identity, and the answer reveals how much the deep ocean still has to teach.
NOAA researchers focused on an object spotted by a remotely operated vehicle in the Gulf of Alaska at depths over two miles.. The finding—reported after work that began in 2023—looked like a strange. golden. mound-shaped organism with a hole. stuck to rock.. From the start, the team expected the mystery might be routine.. Instead, what turned up demanded a multi-layered investigation, combining careful physical study with genetic tools.
The first step was structural: scientists examined the orb’s form closely and found it did not match typical animal anatomy.. Rather than an obvious body plan, the “orb” was made of fibrous material and covered in stinging cells.. Those cells pointed investigators toward a specific group of animals found in water: cnidarians, which include corals and sea anemones.. In particular, the team identified the cells as spirocysts—specialized structures used to capture prey.. Their presence was a crucial clue because spirocysts of this kind exist only within a particular lineage of aquatic invertebrates.
That biological fingerprint led to the next question: had the orb already been seen before?. NOAA researchers compared the golden mound with a specimen collected in 2021 and concluded they were the same species.. Even then, simple DNA checks didn’t provide a clean match.. The breakthrough came with whole-genome sequencing. which showed the orb was genetically almost identical to Relicanthus daphneae. anchoring the identification with high-resolution genetic evidence.
In the final stage of the mystery-solving process, scientists pieced together the orb’s likely origin.. Analysis suggested the golden object had once been part of the base of a giant sea anemone.. NOAA’s explanation framed the orb as something that should usually be hidden under the anemone’s body—yet. somehow. this individual appeared “left behind.” That detail raises an uncomfortable but familiar deep-sea question: what happened to the top of the organism?
The most likely scenarios remain uncertain.. NOAA suggested the anemone could have died and the lower portion remained on the seafloor. or it may have moved to a new spot. leaving behind the part that ended up being discovered by the vehicle.. Either way. the “hole in it” and the mound-like appearance make sense when you consider that the structure may have been separated from the rest of the animal rather than observed in a pristine. complete form.
The animal itself is no small character in the deep sea.. Researchers describe a pink. cylindrical body that can grow to roughly three feet across. with tentacles that may reach up to six feet long.. Spirocysts in this species are also described as among the largest known for any cnidarian—an adaptation that likely matters for capturing prey in the dark. food-sparse environment of the deep ocean.
For people on the surface. the practical value of this kind of discovery is easy to miss until you connect the dots.. When a scientific team can correctly identify a strange organism. it doesn’t just solve a curiosity—it strengthens biological catalogs that support future research. from mapping ecosystems to understanding how ocean life may respond to changing conditions.. In other words, “mysteries” in the deep sea are often stepping stones toward better knowledge of ocean resources.
Misryoum sees a larger theme here: exploration technologies are increasingly paired with advanced biology.. Remote vehicles allow scientists to reach places that would be nearly impossible to sample directly. while modern genetic analysis can discriminate between organisms that look similar in the dark.. The golden orb became identifiable only when multiple lines of evidence—fibrous structure. spirocysts. comparisons to earlier specimens. and whole-genome sequencing—converged.
That multi-tech approach may also explain why Misryoum thinks these finds feel more “solvable” in recent years.. As sequencing becomes faster and bioinformatics more accessible, researchers can move beyond classification by appearance alone.. The result is a clearer view of how deep-sea animals are related. how they hunt. and how their bodies might separate or persist after events like death or shifting habitats.
For now. the golden orb’s story is complete in scientific terms: it belongs to Relicanthus daphneae and reflects part of a larger giant sea anemone structure left behind on the seafloor.. The remaining uncertainty—what exactly happened to the rest—may require future dives.. And until another vehicle returns to the same depths with fresh footage and samples. that last piece will stay as a reminder that the deep ocean doesn’t just hide life; it also hides the circumstances that shape it.