FIGURES 29–34 in Stenopterobia cataractarum sp. nov. (Bacillariophyta), a new benthic diatom from a waterfall in Zambia, Africa

FIGURES 29–34: Stenopterobia cataractarum sp. nov., type material from sample 12-349, Ntumbachushi Falls, Luapula Province, Zambia, external valve view. SEM. Figure 30. Entire valve showing the slightly elevated axial area on the valve face and the distinct fenestra on both valve face and valve mantle. Figures 31, 33–34. Detail of the terminal raphe fissures bent to the valve mantle. Figure 32. Valve face showing bi-to triseriate striae composed of round areolae, the broad axial area and one to two shortened transapical ribs in between the ribs connected to the alar wings. Figure 33. Mantle view showing the slightly comma-shaped terminal raphe fissures, the shortened ribs and one open girdle band near the apex. Figure 34. Junction of the valve face and mantle with the funnel-shaped thickenings near the apex. Scale bars: 10 µm (in Figs 29–30)., Scale bar: 3 µm (in Fig. 32). Scale bar: 2 µm (in Figs 31, 33–34).