Paraonis amazonica sp. n., chaetae. A Acicular chaetae with a lateral spine of anterior setiger 3 B Posterior hook-shaped chaeta with terminal spine and acicular chaetae with a lateral spine (left) in setiger 30 C Hook-shaped chaeta with a terminal spine in the last setiger, 36 D Pygidium with three anal cirri, ventral view. Scale bars 50 µm (A–C), 0.25 mm (D).