Published March 5, 2025
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Ambusher in sponge: a new species of Eunice (Annelida, Eunicidae) commensal within deep-sea Farreidae (Porifera, Hexactinellida) on northwest Pacific seamounts
Authors/Creators
- 1. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai Guangdong, China|Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China
- 2. Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China
- 3. Shanghai Jiao Tong University, Shanghai, China|Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China|Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai Guangdong, China
Description
Deep-sea sponges create complex biogenic structures and attract a wide array of deep-sea organisms, including symbionts. In this study, we describe Eunice siphoninsidiator sp. nov., a new eunicid species living in the central cavity of deep-sea farreid glass sponges found on northwest Pacific seamounts. The new species closely resembles the Atlantic Eunice norvegica both morphologically and molecularly, but it differs in the relative length of palp compared to peristomium, starting points of subacicular hooks, and shape of pectinate chaetae. A 13% COI genetic distance between the two species further supports the establishment of E. siphoninsidiator as a distinct species. Gut content analyses reveals fragments of barnacles and brittle stars, suggesting a carnivorous diet and a sit-and-wait predatory strategy. The eunicid gains protection from living inside the sponge, which consistently harbored the polychaete in all specimens examined, while the sponge benefits from the cleaning of epibionts, pointing to a potentially mutualistic relationship.
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