Off the coast of British Columbia, in waters long familiar to science yet still yielding secrets, researchers from the University of British Columbia have named two marine arthropods previously unknown to the scientific record — the first such discovery in the Salish Sea in nearly a century. These creatures, called sea spiders though they share no true kinship with the spiders of land, carry with them a lineage half a billion years old, quietly inhabiting an ecosystem that exists within reach of major cities yet remains, in meaningful ways, unexplored. Their discovery is less an ending than an
Two new sea spider species discovered in Salish Sea after nearly a century
an ecosystem within an ecosystem within an ecosystem
Mark
So these are actual spiders that live in the ocean?
Mimi
No, that's the confusing part. They're called sea spiders, but they're not true spiders at all. They're marine arthropods—more distantly related to actual spiders than spiders are to scorpions.
Luke
Wait, that doesn't sound right. The source says they're related to scorpions, spiders, and horseshoe crabs. So they share a common ancestor with spiders, but they're not in the spider family?
Mimi
Exactly. They evolved separately, about 500 million years ago. Same branch of the tree, different limbs.
Mark
And these two new ones—what makes them different from sea spiders that were already known?
Mimi
One has these long curved spines on its legs and red eyes, and it can groom itself. The other one can't groom well, so it ends up covered in parasites and debris.
Luke
But we don't actually know if that's a permanent condition or just how they appeared when collected. The source says it "often" appears covered, not that it always is.
Mimi
Fair point. But Toler-Scott's observation about it creating nested ecosystems is striking—the parasite becomes a habitat.
Mark
Why haven't these been found before? The Salish Sea isn't exactly remote.
Mimi
The researcher only had one field season. He's suggesting there's a lot more out there that hasn't been documented yet. It's not that they're rare—it's that nobody was looking in the right way.
Luke
Or at least, not recently. The last documentation was nearly a century ago, so either the methods have improved or the effort has been sporadic.
Mark
So what happens now?
Mimi
They're registered in a global database. Toler-Scott says more field work will likely turn up additional species. The discovery opens the door to further research.
O Pulso
- For the first time in roughly a hundred years, two species of sea spider have been formally identified in the Salish Sea, breaking a long silence in the regional scientific record.
- One species, covered in curved spines and bearing red eyes, presents an almost alien appearance, while the other is so poorly equipped for self-grooming that it becomes a living habitat for parasites and debris — two radically different survival strategies sharing the same coastal waters.
- The discovery challenges casual assumptions about well-studied ecosystems: the Salish Sea sits beside Vancouver and Victoria, yet has concealed these creatures from scientific documentation across a century of research.
- Researchers have formally registered both species in a global marine database, anchoring them in the scientific record and opening the door to comparative study of their ancient arthropod lineage.
- Lead researcher Cormac Toler-Scott cautions that only one field season of collection has been completed, suggesting the two named species may represent only the visible edge of a much broader undocumented diversity.
Off the coast of British Columbia, in waters long familiar to science yet still yielding secrets, researchers from the University of British Columbia have named two marine arthropods previously unknown to the scientific record — the first such discovery in the Salish Sea in nearly a century. These creatures, called sea spiders though they share no true kinship with the spiders of land, carry with them a lineage half a billion years old, quietly inhabiting an ecosystem that exists within reach of major cities yet remains, in meaningful ways, unexplored. Their discovery is less an ending than an opening — a reminder that the boundary between the known and unknown runs not only through distant wilderness, but through the waters at our doorstep.
A University of British Columbia research team has named two previously undocumented sea spider species found in the Salish Sea — the first such discovery in the region in nearly a century. Collected at sites spanning Vancouver to Victoria and the surrounding islands between September 2023 and August 2024, the find quietly expands what science knows about the marine life inhabiting British Columbia's coastal waters.
Despite their name, sea spiders are not true spiders. They belong to a distinct lineage of marine arthropods that diverged roughly 500 million years ago, sharing common ancestry with scorpions and horseshoe crabs. They range from barely a centimeter wide to more than 70 centimeters across, and all share a proboscis — a tube-like feeding structure used to extract nutrients from hosts or surroundings.
The first newly named species, Callipallene pilosuspedes, takes its name from the Latin for "hairy feet," a nod to the long curved spines lining its lower legs. It has red eyes, a triangular three-lipped mouth ringed with sensory tendrils, and specialized appendages for grooming — keeping itself relatively clean. The second, Tanystylum kiixin — pronounced "kee-hin" — is named for an ancient Indigenous village near its collection site. Unlike its counterpart, kiixin lacks effective grooming limbs and is frequently encrusted with debris and parasites. Lead researcher Cormac Toler-Scott described it as "an ecosystem within an ecosystem within an ecosystem," the sea spider itself becoming a miniature habitat for other life.
Both species have been entered into a global marine database. Toler-Scott was careful to frame the work as a beginning rather than a conclusion — with only one field season behind him, he believes considerably more sea spider diversity remains undocumented in these waters. The Salish Sea, despite its proximity to major cities and decades of scientific attention, continues to hold creatures unknown to science, offering a quiet lesson in the limits of what we assume we already know.
A team of researchers from the University of British Columbia has identified two sea spider species in the Salish Sea—the first new documentation of these creatures in the region in nearly a century. The discovery, made between September 2023 and August 2024, expands our understanding of the marine life inhabiting the waters off the British Columbia coast, from Vancouver to Victoria and the islands in between.
Despite their common name, sea spiders are not true spiders at all. They belong to a separate lineage of marine arthropods that evolved roughly 500 million years ago and share ancestry with scorpions, horseshoe crabs, and terrestrial arachnids. Some species can grow to more than 70 centimeters in length, though many shallow-water varieties remain tiny—less than a centimeter across. What unites them is a distinctive feeding apparatus called a proboscis, a tube-like structure they use to extract nutrients from their surroundings.
The first of the two newly identified species, Callipallene pilosuspedes, earned its name from the Latin words for "hairy feet." The creature is covered in long, curved spines along its lower legs, and it possesses red eyes that give it an otherworldly appearance. Its mouth is triangular with three lips and ringed with sensory tendrils, while a short proboscis equipped with claws allows it to grasp and consume food. The species also has specialized appendages it uses to groom itself, keeping its body relatively clean.
The second species, Tanystylum kiixin—pronounced "kee-hin"—takes its name from an ancient Indigenous village near where researchers collected specimens. This creature presents a starkly different lifestyle. Its small limbs limit its ability to groom effectively, which means it often appears encrusted with debris and tiny parasites. Cormac Toler-Scott, the lead researcher and zoologist who directed the work, described this condition as creating "an ecosystem within an ecosystem within an ecosystem," a layering of life that transforms the sea spider itself into a miniature habitat.
Many shallow-water sea spider species, including some of those found in the Salish Sea, live as parasites on larger organisms. They use their proboscis to pierce their hosts and draw out bodily fluids—a feeding strategy that has persisted for millions of years. The two newly documented species have been registered in a global database, joining the scientific record of known marine life.
Toler-Scott emphasized that the work represents only a beginning. With just one field season of collection behind him, he noted that considerably more sea spider diversity likely awaits discovery in these waters. The Salish Sea, despite its proximity to major population centers and decades of scientific study, continues to harbor creatures unknown to science—a reminder that even well-studied ecosystems hold surprises for those patient enough to look.
Citações Notáveis
A lot of the shallow water species are quite small, and so they'll live as parasites on larger organisms, and they use this weird apparatus called a proboscis to suck the juices out of their host.— Cormac Toler-Scott, lead researcher
I only had one field season but there's definitely more diversity out there that we haven't documented.— Cormac Toler-Scott
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