Scanning electron microscopy images of operculum (A–H) and chaetae (I–M) of Spirobranchus akitsushima sp. nov. A–D ventral view of endplate E–H lateral view. Note that some endplates are with a rounded swelling (sw), B–D. I thoracic capillary chaetae, scales are in close-up J thoracic uncini K abdominal true trumpet-shaped chaetae L abdominal uncini. Scale bars: 0.1 mm (A–H); 0.01 mm (I–L).