FIGURES 236–252 in The genus Diploneis Ehrenberg ex Cleve (Bacillariophyta) from Lake Hövsgöl, Mongolia

FIGURES 236–252. LM and SEM external valve views. Figs 236–245. Diploneis oculata. Figs 236–242. LM valve views. Fig. 243. View of the whole valve overlaid by the girdle bands. Fig. 244. View of the entire valve. Fig. 245. Proximal raphe endings and detailed view of the external alveolate openings covered with vola. Fig. 246–252. Diploneis peterseni, LM and SEM external valve views. Figs 246–249. LM valve views. Fig. 250. Valve central area with simple proximal raphe endings. Fig. 251. Distal raphe endings. Fig. 252. View of the entire valve. Scale bars = 10 μm (Figs 236–242, 246–249); 5 μm (Fig. 252); 2 μm (Figs 243–245, 250); 1 μm (Fig. 251).