Clymenura scutata sp. n. A) Entire worm, lateral view, tube removed, B–C) cephalic plaque, latero-dorsal views, D–E) posterior end and anal plaque, lateral and ventral view, respectively, F) anal plaque, posterior view, G) worm regenerating cephalic plaque and first anterior segments. A–D, F) Holotype LEMA-PO153, E, G) Paratype UANL 8144. Scale bars: A) 2 mm, B–E, G) 1 mm, F) 0.6 mm.