FIGURES 15–18 in A new species of Cymbella (Cymbellaceae, Bacillariophyceae) from China, possessing valves with both uniseriate and biseriate striae

FIGURES 15–18. Cymbella distalebiseriata sp. nov., frustule and girdle view, SEM. 15. Frustule in ventral girdle view. 16. Frustule in side view, note deep mantle on dorsal side. 17–18. Details of Fig. 15, showing apical pore fields, girdle bands and some biseriate striae with their corresponding uniseriate striae on mantle (arrows). Scale bars =10 μm (Figs 15–16), 5 μm (Figs 17–18).