FIGURES 21–26 in A new small marine Diploneis species (Diploneidaceae, Bacillariophyta) from Guangdong Province, China

FIGURES 21–26. Diploneis guangdongensis sp. nov., SEM external valve view. 21. External view of the whole valve. 22–23. External view of the elongated slits (Fig. 22, white arrow) and distal raphe endings. 24. Expanded, drop-shaped proximal raphe endings and structure of the longitudinal canal; the elongated slits are formed as an interspace between costae (white arrow). 25. Girdle bands. 26. External opening of alveoli covered with volae. Scale bars = 1 µm (Figs 21–22, 24–26); 500 nm (Fig. 23).