Anatomical details of Actinocyclus verrucosus. 5. Rhinophore extracted, ventral view, scale: 0.5 mm. 6. Same dorsal view, scale: 0.5 mm. 7. Same, transverse section, scale: 0.5 mm. 8. Gill circle with retractor muscle, dorsal view, scale: 1 mm. 9. Detail of gill filament, scale: 1 mm. 10. Detail of circulatory system (structures of pericardium), ventral view, scale: 2 mm. 11. Extracted visceral mass, dorsal view, scale: 2 mm. 12. Same, ventral view, scale: 2 mm.