Thelepus parapari sp. n. A lateral view of anterior end (numbers of S are shown, nephridial papillae arrowed) B detail of anterior end, showing pigmented spots C dorsal view D view of posterior end (arrowed last segment with notochaetae) E ventral view F U1 uncini G U25 uncini. A, C–E holotype BMNCN 5700 F–HMNCN 5706. All worms stained with methylene blue. Scale bars: 1 mm (A–E); 20 μm (F, G).