Procamallanus spiculastriatus sp. n., female, scanning electron microscopy. a oral opening, frontal view, three circles of cephalic papillae (a, b, c), amphid (am, arrowhead), pore-like structures (arrows) b oral opening, view of buccal capsule, two teeth are visible at the base of the basal ring (arrows) c deirid d excretory pore. Scale bars: 10 µm (a, b); 2 µm (c); 5 µm (d).