New Sea Spiders Discovered After Century-Long Gap

For the first time in about 100 years, scientists have discovered new species of sea spiders in the Salish Sea. Researchers at the University of British Columbia have identified and named two novel marine invertebrates: Callipallene pilosuspedes and Tanystylum kiixin. These specimens were collected between September 2023 and August 2024 during underwater research expeditions in various locations around Vancouver Island.

The Callipallene pilosuspedes is notable for its exceptionally hairy appendages, a characteristic reflected in its name. This species features red eyes and a specialized mouthpart. In contrast, the Tanystylum kiixin, named in honor of an ancient Indigenous village site, exhibits smaller limbs and was observed covered in a multitude of tiny parasites, creating a complex micro-ecosystem.

Scientists employed DNA sequencing alongside physical examinations to confirm these as new species. Lead author Cormac Toler-Scott highlighted that while marine invertebrate discoveries are relatively common, sea spiders remain an understudied group due to their small size and marine habitat. This discovery is particularly significant as it adds to the limited known sea spider species in the region, enhancing baseline biodiversity knowledge.

Future research by Toler-Scott will focus on the life stages and behavior of Tanystylum kiixin. The team aims to investigate broader ecological questions, such as the impact of climate change on these organisms. The researchers emphasize that these sea spiders are harmless and represent a unique aspect of marine life worth appreciating.