FIGURES 47–52 in Two new freshwater species of Bacillaria (Bacillariophyta) from Dongting Lake, China

FIGURES 47–52. Bacillaria dongtingensis sp. nov., external view, SEM. 47. A complete valve. 48. Middle part detail of Fig. 47, note raphe flange present on one side only (RF), two transapical ribs merging into one (three curved arrows), and rudiments of marginal spines. 49. An apical detail of Fig. 47, note raphe flange present on one side only (RF) and T-shaped distal raphe end. 50. Another apical detail of Fig. 47, note one transapical rib forming two branches (arrow) and two transapical ribs merging into one (three curved arrows). 51. Other valve middle part, note one transapical rib forming two branches (arrow) and rudiments of marginal spines. 52. Other valve apex, note raphe flange present on one side only (RF) and one transapical rib forming two branches (arrow). Scale bar = 10 μm (Fig. 47), 3 μm (Figs 48–52).