FIGURES 65–69. Diploneis elliptica, SEM external valve views. Figs 65, 67 in The genus Diploneis Ehrenberg ex Cleve (Bacillariophyta) from Lake Hövsgöl, Mongolia

FIGURES 65–69. Diploneis elliptica, SEM external valve views. Figs 65, 67. View of the whole valve. Fig. 66. Close view of the cribrate occlusions. Fig. 68. Valve central area with proximal raphe endings. Fig. 69. Distal raphe endings with terminal raphe fissures. Areolae biseriate formation (black arrow on the cribra structure at the valve apices). Scale bars = 10 μm (Figs 65, 67); 2 μm (Figs 66, 68, 69).