FIGURES 15–22. Gomphonema shanghaiensis, SEM. External view. 15–20 in Gomphonema shanghaiensis sp. nov., a new diatom species (Bacillariophyta) from a river in Shanghai, China

FIGURES 15–22. Gomphonema shanghaiensis, SEM. External view. 15–20. Centre of valve exterior of six different specimens. Slightly expanded and dilated proximal raphe ends, striae composed of "C" shaped or round areolae. 21. External view of the headpole with the external distal raphe end curving onto the valve mantle. 22. Exterior of valve showing the deflected apical end of raphe and rounded porelli. Scale bars = 2 μm (Figs 15–21) and 1μm (Fig. 22).