FIGURES 20–23 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 20–23. SEM images of Giffenia koreana sp. nov. using type materials. Figs 20, 21: Valve face displaying the terminal valve apex with a hyaline area. Fig. 22: The apex of the epi/hypo-valve featuring a terminal hooked raphe and numerous alveoli. Fig. 23: The mantle showing numerous nail-shaped pores clusters positioned below the raphe slit (arrow). Scale bars: 5 µm for Fig. 21; 10 µm for Figs 20, 22, 23.