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Sthenelanella is an unusual genus of tube‐dwelling scale worms, with fine fibrous threads that appear on either side of the body. These fibers emerge dorsally in long silvery bundles that are then tightly interwoven to construct the felt‐like material of the tube. In the literature, these fibers are described as the products of so‐called “spinning glands.” In this article, we investigated the ultrastructure...