FIGURES 53–56 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas

FIGURES 53–56. Diploneis cristata sp. nov., SEM external valve views, Lake Tanganyika. 53, 55. Specimen from Isanga Bay. 54, 56. Specimen from Ndole Bay. 53. Whole valve. 54. Close view of striae structure; arrowed areola divided by thick thickenings bearing fin-like silica ridges. 55. Central area with extended teardrop shaped depressions with proximal raphe ends. 56. Distal raphe ends with deflected terminal fissures. Scale bars = 10 μm (Fig. 53), 5 μm (Figs 55, 56), 2 μm (Fig. 54).