FIGURES 53–58 in Two new freshwater species of Bacillaria (Bacillariophyta) from Dongting Lake, China

FIGURES 53–58. Bacillaria dongtingensis sp. nov., internal view, SEM. 53. A complete valve. 54. Middle detail of Fig. 53 showing fibulae (F), two asymmetrical fibular ribs (FR), and two transapical ribs merging into one (three curved arrows). 55. Another apical detail of Fig. 53, note one transapical rib forming two branches (arrow) and two transapical ribs merging into one (three curved arrows). 56. Another apical detail of Fig. 53, note two asymmetrical fibular ribs (FR). 57. Other valve middle part, note one transapical rib forming two branches (arrow). 58. Other valve apex, note two fault sites (two arrows). Scale bar = 10 μm (Fig. 53), 2 μm (Figs 54–58).