FIGURES 49–53. Diploneis praeclara, SEM external valve views. Fig. 49 in The genus Diploneis Ehrenberg ex Cleve (Bacillariophyta) from Lake Hövsgöl, Mongolia

FIGURES 49–53. Diploneis praeclara, SEM external valve views. Fig. 49. View of the entire valve. Fig. 50. Close view of the cribrate occlusions. Fig. 51. Distal raphe endings. Fig. 52. One row of areolae of the longitudinal canal at the valve apices. Fig. 53. Central area with proximal raphe endings. Scale bars = 10 μm (Fig. 49); 5 μm (Figs 51–53); 2 μm (Fig. 50).