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Swima fulgida is a pelagic marine polychaete worm characterized by its darkly pigmented anterior gut and buccal organ. It also possesses single, subulate, medial branchia, a transparent gelatinous sheath penetrated throughout by narrow papillae, simple noto- and neurochaetae, and three achaetous segments supporting ellipitical, bioluminescence-producing, derived branchiae that are less than 1.2 mm in length.
[Osborn et al. 2011]