Tetranemertes majinbuui sp. nov. A external appearance in life of individual CB056_18_01 B–D Close ups of head of a living individual CBdT0058, showing eyes and cephalic furrow (arrowheads) in lateral (B) and dorsal (C) view. Note the cephalic furrow is on the ventral side, but shows through due to transparency of the body at the anterior end D Head compressed under a coverglass to show number and distribution of eyes E stylet armature of individual CB056_18_01 with a typical posteriorly bilobed basis F stylet armature of individual CBdT0058 with a less typical basis (not bilobed or forked posteriorly). Note helical sculpting of stylet shaft. Abbreviations: cg — cerebral ganglion, co — cerebral organ. Scale bars: 5 mm (A); 1 mm (B–D); 25 μm (E, F).