In 2017, a remotely operated vehicle descended the rocky slopes of the Caroline Seamount in the Western Pacific and collected a small, gelatinous octopus at 1,240 meters depth. The animal had the hallmark look of a dumbo octopus: a rounded mantle, wide webbing between its arms, and a pair of fleshy fins that flapped slowly like oversized ears. But something about it didn’t match any species on record. After years of painstaking laboratory work, a research team has now confirmed what the ROV’s cameras first hinted at: the octopus belongs to a species never before described by science.
Meet Grimpoteuthis feitiana
The formal description was published in Organisms Diversity & Evolution, a peer-reviewed journal from Springer Nature, in early 2025. The team named the species Grimpoteuthis feitiana, drawing on the Chinese word fēitiān (飞天), which refers to celestial figures depicted soaring through the sky in Buddhist art. The name is a nod to the octopus’s graceful, almost weightless movement through the deep ocean, its fins rippling in slow arcs as it drifts above the seafloor.
To confirm the animal was genuinely new, the researchers used an integrative taxonomy approach. They examined the internal shell’s shape, counted and mapped the suckers along each arm, measured the fins that give dumbo octopuses their cartoon-character silhouette, and analyzed subtle differences in the webbing that connects the arms. These features were compared against museum specimens and published descriptions of the roughly 15 other recognized Grimpoteuthis species. The Caroline Seamount animal didn’t fit any of them.
That physical specimen is what separates G. feitiana from the many dumbo octopuses glimpsed only on camera. Its preserved tissues can be re-examined as new molecular and imaging techniques emerge, giving future researchers a fixed reference point for the species.
Why deep-sea robots matter
Dumbo octopuses live at depths where sunlight never reaches, and most of what scientists know about them comes from remotely operated vehicles. ROVs are tethered to research ships by long cables, carrying cameras, lights, and collection tools into pitch-black water. Pilots on the surface guide them over ridges, into canyons, and along seamount walls, streaming live video that researchers annotate in real time.
Multiple NOAA programs have captured dumbo octopus footage this way. An expedition aboard the E/V Nautilus in the Papahānaumokuākea Marine National Monument produced imagery of the animals during deepwater surveys of the central Pacific. Separate Nautilus operations in the Monterey Bay National Marine Sanctuary recorded dumbo octopuses at depths approaching 11,000 feet, or roughly 3,350 meters. Other ROV dives have documented them in Arctic waters at around 900 meters.
These encounters reveal behavior that no preserved specimen can capture: the slow, energy-efficient fin flapping that distinguishes dumbo octopuses from the jet-propelled swimming of their shallow-water relatives. The Bureau of Ocean Energy Management, a federal agency within the U.S. Department of the Interior, has described this fin-driven locomotion as a defining trait of the genus, well suited to the low-nutrient conditions of the deep ocean.
But ROV footage has a significant limitation. While it can show an animal’s movement, posture, and general shape, it rarely provides enough detail for species-level identification. The exact sucker count, internal shell geometry, and fine webbing measurements that distinguish one Grimpoteuthis species from another are invisible on camera. Color, apparent size, and body posture can also shift depending on the animal’s age, sex, and the conditions at the moment of filming. That means a dumbo octopus recorded at 3,000 meters in one part of the Pacific could be G. feitiana, a close relative like G. bathynectes, or something else entirely. Without a collected specimen, there is no way to be certain.
What scientists still don’t know
The taxonomic paper anchors G. feitiana to a single specimen from a single seamount at a known depth. Almost everything else about the species remains open.
Researchers do not yet know the animal’s full depth range. The type specimen was collected at 1,240 meters, but other Grimpoteuthis species have been found thousands of meters deeper. Whether G. feitiana shares that range or occupies a narrower band of habitat is unclear. Its geographic distribution beyond the Caroline Seamount is also unknown. Seamounts are often described as biodiversity hotspots because their steep slopes and complex currents can isolate populations, but whether this species is a seamount specialist or a more widespread deep-sea drifter will require additional surveys and specimens from other locations.
Ecological details are similarly thin. The species’ diet, reproductive habits, and role in the local food web have not been studied. Conservation assessments are premature without baseline data on abundance, and no direct statements from the describing researchers about the species’ vulnerability have been published in the primary record.
These gaps are not unusual. Deep-sea taxonomy often works from single specimens or very small collections, and decades can pass between a species’ formal description and any meaningful understanding of its biology. The ocean below 1,000 meters remains one of the least explored environments on Earth.
A pattern that keeps repeating
The discovery of G. feitiana fits a pattern that deep-sea researchers have watched unfold for years. Each time an ROV reaches a new stretch of seafloor, whether on a targeted seamount survey, a marine monument expedition, or a sanctuary dive, it tends to encounter organisms that don’t match existing descriptions. Many of those organisms will eventually be confirmed as species new to science, but only if someone collects a specimen and commits to the slow, detail-heavy work of formal taxonomy.
That bottleneck is real. ROV technology has advanced rapidly, and live-streamed deep-sea footage now reaches millions of viewers online. But the pipeline from dramatic video to confirmed species name remains narrow, dependent on limited ship time, scarce funding for taxonomic research, and a small community of specialists trained to tell one soft-bodied octopus from another under a microscope.
For now, G. feitiana occupies a rare position: a deep-sea animal that exists both as a preserved specimen in a laboratory and as part of a broader visual record of dumbo octopuses filmed by robots in the dark. Its name, inspired by celestial figures in flight, captures something real about the way these animals move, fins outstretched, drifting slowly through water that no human eye will ever see unaided.
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*This article was researched with the help of AI, with human editors creating the final content.
