FIGURES 5–12 in Two new species of Plagiostriata (Bacillariophyaceae) from sand sediments of southern China

FIGURES 5–12. Plagiostriata xiapuensis sp. nov from type material, SEM. 5–7. External views of the valve with a rimoportula (arrow). 8. Apical fields of the external valve. 9. Central area of a valve with no rimoportula. 10. Apical fields of the internal valve. Areolae round, occluded by simple vola (arrows). 11, 12. Internal views of the valve with a rimoportula (arrow). Scale bars = 1 μm (Figs. 5–7, 9, 11, 12), 0.2 μm (Figs. 8, 10).