Ophelina sp. NHM_1331 (specimen NHM_1331). A Lab image, whole specimen, dorsal view (faded stain) B Lab image, whole specimen, lateral view (faded stain) C Live image, whole specimen D Lab image, anterior (faded stain, br = branchiae, no = nuchal organ) E Lab image, detail of anterior (br = branchiae, no = nuchal organ) F Lab image, posterior, anal funnel (br = branchiae) G Lab image, detail of posterior and anal funnel (br = branchiae). Morphological features in plates B, D–G have been outlined with a fine white line to improve clarity of those features. Scale bars: 1 mm(A, B); 100 μm (E, G).