FIGURES 102–107 in The diatom genus Oricymba in Vietnam and Laos with description of one new species, and a consideration of its systematic placement

FIGURES 102–107. Oricymba voronkinae sp. nov. SEM, external views. 102, 103. Low magnification valve views showing arched raphe and round stigma opening. 104, 105. Central area with dilated proximal raphe ends and round stigma opening. Marginal ridge is evident. 106. View of striae with the overlay of silica to form the characteristic striae with subtending dendritic coverings. The marginal ridge is evident. 107. Apex with strongly hooked distal raphe end not bisecting the apical pore field. Pore field restricted to mantle. Scale bars = 10 μm in Figs 102, 103; 1 μm in Fig. 104; 2 μm in Fig. 105; 0.5 μm in Figs 106, 107.