FIGURES 15–19 in Giffenia koreana sp. nov. (Bacillariophyta): A newly identified epipelic diatom in the tidal flat sediments of Suncheonman Bay, extant for over 1,400 Years

FIGURES 15–19. SEM images of Giffenia koreana sp. nov. on the type materials. Fig. 15: A whole cell displaying the central thin lipshaped sternum (arrow), numerous alveoli, and raphe slit. Figs 16–19: A hyaline area between the raphe slit and the alveoli (arrow). Figs 17–19: Valve apex featuring a downturned raphe apex, and with curved alveoli (arrow). Scale bars: 5 µm for Figs 18, 19; 10 µm for Figs 15–17.