FIGURES 10–13 in Morphology and ultrastructure of Sellaphora constrictum sp. nov. (Bacillariophyta), a new diatom from southern China

FIGURES 10–13. Sellaphora constrictum sp. nov. SEM, external views. Fig. 10. Valve view of entire valve, showing constriction in the middle of the margins, undulation of raphe, two types of areolae (arrow I and arrow II), conopeum (arrow A), the trough borders the conopeum (arrow B) and the ridge borders the trough (arrow C). Fig. 11. Valve view of entire valve, showing the ridge near the valve margin (arrow A) and the ridge along the border of the valve face and the mantle (arrow B), the mantle (arrow C) and the girdle (arrow D). Fig. 12. Central part of the valve, showing dilated proximal raphe ends, two types of areolae, the trough borders the conopeum (arrow A), the ridge borders the trough (arrow B) and expanded conopeum (arrow C). Fig. 13. Valve apex, showing distal raphe end curved on the mantle and arrangement of striae at apices. Scale bar =2 μm.