Ophelina martinezarbizui sp. nov. A Live images, whole specimen (center) with detail of anterior (left) and anal funnel (right) (holotype [specimen NHM_681], e = eggs, vc = enlarged ventral cirrus, c = cirri) B Lab image, whole specimen (holotype). C Lab image, detail of palpode (paratype NHM_2116) D Live image, prostomium, “royal crown” palpode (specimen NHM_2092) E Lab image, ventral posterior and branchiae (paratype NHM_1766, br = branchiae) F Lab image, lateral posterior and branchiae (paratype NHM_1766, br = branchiae) G Lab image, detail of anal funnel (paratype NHM_1766, vc = enlarged ventral cirri [folded over], c = cirri, br = branchiae H Lab image, detail of capillary chaetae (holotype). Morphological features in plates A, E, G have been outlined with a fine white or black line to improve clarity of those features. Scale bars: 1 mm (B, E, F); 100 μm (C, H).