Thelepus marthae sp. n. external morphology. A–C lateral view of anterior end (arrowed nephridial papillae) D detail of anterior end, showing pigmented eyespots E lateral view of posterior end (arrowed last segment with notochaetae) F, H dorsal view of anterior end G ventral view of anterior end. ASP-22 st.60 B, F, G holotype C, H Alaid 30.3 D, ESP-22 st. 72. Scale bars: 1 mm. All worms but D stained with methylene blue.