Eunoe opalinaEunoe opalina is a scale worm widely distributed in the Southern Ocean at depths of about 200–1400m.DescriptionNumber of segments 38; elytra 15 pairs. No distinct pigmentation pattern. Prostomium anterior margin comprising a pair of acute anterior projections. Lateral antennae inserted ventrally. Notochaetae thinner than neurochaetae. Bidentate neurochaetae absent.CommensalismE. oplina is commensal. Its host taxon is a sea cucumber: Bathyplotes bongraini.