Researchers have described a red-eyed sea spider with hairy legs—and watched it use tiny comb-like spines to groom itself. The animal is one of two species new to science documented in the Salish Sea, where researchers say sea spiders had not been comprehensively studied in almost a century.
Its official name is Callipallene pilosuspedes, a name built around the idea of “hairy feet.” It is not a true spider, despite the nickname. Sea spiders, or pycnogonids, are marine arthropods with a body plan strange enough to make the distinction feel like a technicality worth explaining. The newly described species was collected during dives and examined through anatomical detail and genetic analysis.
The grooming discovery came under a microscope. Researchers observed the animal curling specialized appendages around its legs and using comb-like spines to clean them. That is a remarkable tiny behavior, but the study is also a careful survey of a poorly documented group—not evidence that a swarm of these creatures has suddenly appeared off the coast.
A miniature creature with a startling face
The UBC team describes C. pilosuspedes as having long, curved spines on its lower legs, red eyes, a short proboscis used to grasp food, and a triangular mouth edged with sensory tendrils. At microscope scale, that mouth resembles a small pit lined with feelers. The university’s story compared it to a Sarlacc, the fictional creature from Star Wars; that is a visual comparison, not a claim about the animal’s behavior or size.
The name is unusually apt. “Pilosuspedes” refers to the hairy-looking feet, the feature that helps distinguish this species. The researchers also describe flexible ovigers—appendages sea spiders use in reproduction—that can double as grooming tools. In the observed specimen, the animal wrapped those appendages around its legs and ran the comb-like spines along them.
That is the image the discovery gives readers: not a giant monster lurking in a trench, but a tiny animal carrying its own grooming kit. Its odd appearance is real; the scale is the part that keeps the story grounded.
Two new species, but one rare observation
The second new species, Tanystylum kiixin, has a different story. Its name honors an ancient village site near where specimens were first collected. Researchers found it associated with a hydroid, a small marine animal related to jellyfish and corals. Its egg-carrying limbs are less dexterous than those of C. pilosuspedes, and it does not groom itself in the same way.
The team collected specimens between September 2023 and August 2024 at several sites around Vancouver Island and the Salish Sea. That timing matters: the species were newly documented and described in research published in Organisms Diversity & Evolution, rather than discovered during a new September dive.
Researchers found only one specimen of the hairy-legged, red-eyed species. That makes the grooming behavior a fascinating observation, while also limiting what scientists can yet say about how typical it is across the species. It would be premature to turn one observed animal into a sweeping claim about every member of its kind.
Sea spiders are not spiders—and that helps explain the mystery
Sea spiders are strictly marine arthropods, not ordinary land spiders adapted for swimming. They live on the seafloor and are often small and difficult to study. Their biology also has some striking variations: males carry eggs on specialized limbs, while females produce eggs from ovaries distributed through their legs.
The Salish Sea study combines physical descriptions with molecular evidence to examine seven coastal species. It redescribes five species already known to science and formally adds two new ones. The researchers also provide an identification key for sea spiders in the Salish Sea and along Vancouver Island’s west coast.
That identification work is less flashy than the red eyes, but it is the foundation for learning what lives there. If scientists cannot reliably tell one species from another, it becomes harder to track where each lives or notice when its range changes. The study supplies a baseline for future work; it does not itself measure the effects of climate change or human disturbance.
The payoff is a new creature—and a better map
For pop-culture readers, these animals look like nature borrowed a few design notes from science fiction: hairlike leg spines, sensory tendrils, and eyes that seem lit from within. The real surprise is smaller and more specific. One of the animals can use its own reproductive appendages as grooming tools, and scientists had not formally described it before.
The UBC release includes microscope photographs of both species, which are the best way to see the actual animals. The feature image here is an original illustration, not a photograph of a collected specimen. It interprets the traits described by the researchers; it should not be mistaken for a documentary image.
There is more to find out. The team’s collection includes a single known specimen of C. pilosuspedes, so additional sampling will be needed to learn how common it is, where else it lives, and whether the grooming motion is widespread. For now, the discovery gives the Salish Sea a pair of new names—and gives creature designers one very real set of tiny, comb-equipped legs to study.
Sources
The research is “Sea spiders of the Salish Sea” in Organisms Diversity & Evolution. The University of British Columbia’s report includes the researchers’ descriptions, microscopy images and context about the collection.
