# Two New Sea Spider Species Discovered in British Columbia Rare marine arthropods reveal insights into ecosystem vulnerabilities. - **Source:** [All Articles | Discover Magazine](https://www.discovermagazine.com/rss/all) - **Published:** 2026-09-24 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/be8a4cd0-8dbb-41bb-a12e-4fe4f4a07eba ## Century-long discovery gap Researchers from the University of British Columbia identified two new sea spider species in the Salish Sea, marking the first such discovery in the region in over 100 years. The species, Callipallene pilosuspedes and Tanystylum kiixin, were collected between September 2023 and August 2024 from various marine ecosystems around Vancouver, Bamfield, and Victoria. These findings help address critical knowledge gaps about marine invertebrates in the Salish Sea, where species are particularly vulnerable to climate change and human disturbance. ## Unique morphological features Callipallene pilosuspedes exhibits distinctive characteristics including long spines on its lower legs resembling hairy feet, a short proboscis, grasping claws, and red eyes. Microscopic examination revealed a dexterous oviger appendage used for grooming and egg-carrying. Only one specimen of this species has been found to date. In contrast, Tanystylum kiixin has a smaller oviger, making self-grooming difficult, resulting in it being covered by smaller parasites - described as an ecosystem within an ecosystem. ## Evolutionary significance Sea spiders began evolving approximately 500 million years ago, sharing ancestry with land-dwelling arachnids and horseshoe crabs. Unlike their terrestrial cousins, marine spiders can have up to 12 legs and possess a sucking proboscis similar to butterflies. Antarctic marine arthropods show size variation from under 0.5 inches to nearly 28 inches, typically feeding on smaller organisms or acting as parasites on larger hosts using their proboscis to extract bodily fluids. ## Collection methodology Divers collected specimens from depths of nearly 60 feet below the surface. The team created detailed images and conducted DNA analysis, compiling genetic data for previously unsequenced sea spider species. This work contributed to developing an identification guide for regional sea spiders. Tanystylum kiixin was named after an ancient Indigenous village near its collection site, while Callipallene pilosuspedes' name reflects its hairy-legged appearance. ## Research limitations Lead researcher Cormac Toler-Scott noted the study was limited to a single field season, suggesting more undocumented diversity exists. The team registered the new species in a global database while acknowledging many more likely await discovery. Current understanding of marine arthropods remains limited, with difficulties in species identification hindering conservation efforts for these ecologically important invertebrates. ## Conservation implications The discovery provides baseline data for monitoring how climate change affects marine invertebrates in the Salish Sea. Researchers emphasize that species identification is crucial for protecting key ecosystem elements. The study highlights how little is known about existing species and their lifestyles in this region, despite their vulnerability to environmental changes and human activities. ## Parasitic ecosystem dynamics Tanystylum kiixin's inability to groom itself effectively has created a unique micro-ecosystem where it hosts smaller parasites. This three-tiered relationship (host-parasite-parasite's parasites) demonstrates complex marine ecological interactions. Such observations provide insights into how marine invertebrates adapt to their environments and the intricate relationships that exist in underwater ecosystems. ## Future research directions The study establishes a foundation for further marine biodiversity research in the Salish Sea. Researchers aim to expand sampling efforts to document more species and better understand their ecological roles. Genetic data from these specimens will help track evolutionary relationships among marine arthropods and improve conservation strategies for vulnerable species facing climate change impacts. ## Sources covering this story - https://www.discovermagazine.com/newly-discovered-red-eyed-hairy-legged-sea-spider-is-the-stuff-of-nightmares-49728 — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._