FIGURES 78–83 in Novel diatom species (Bacillariophyta) from the freshwater discharge site of Laguna Diablas (Island Isabela = Albemarle) from the Galapagos

FIGURES 78–83: Frustulia galapagosaxonica sp. nov. SEM external valve views. Figs 78, 79: axial area of the whole valve, with straight outer raphe slit. Figs 80–82: T-shaped proximal (Fig. 81–arrow) and distal (Fig. 81–arrowhead) raphe ends. Fig. 83: Transapical striae composed of apically aligned areolae. Note small terminal nodule area above the T-shaped distal raphe end (arrow) terminating below the pole.