FIGURES 70–73 in The diatom genus Oricymba in Vietnam and Laos with description of one new species, and a consideration of its systematic placement

FIGURES 70–73. Oricymba perjaponica, comb. nov. SEM, external views. 70. Low magnification valve view. The arched raphe and stigma opening are evident. 71. Central area showing dilated proximal raphe ends and round stigma opening. Rectangular striae with subtending dendritic coverings are evident. 72. Axial area showing striae structure and presence of marginal ridges. 73. Apex with pore field porelli physically separate and structurally differentiated from areolae. The distal raphe end does not bisect the pore field. Scale bars = 10 μm in Fig. 70, 1 μm in Figs 71, 72 and 0.5 μm in Fig. 73.