FIGURES 1–6 in Further studies on the species diversity of the marine planktonic diatom genus Skeletonema (Bacillariophyta) in the Mexican Pacific

FIGURES 1–6. Skeletonema ardens, LM (1–3), SEM (4, 5) and TEM (6). Figs 1–3. Three different chains with 2, 5 and 6 cells, respectively, with one to two chloroplasts per cell; the small arrow (Fig. 1) points to a long terminal process (probably a rimoportula). Fig. 4. A short chain with two cells, arrows point to terminal rimoportulae (TR's). Fig. 5. Solitary cell with very long fulto- and rimoportulae (arrows). Fig. 6. Chain with three cells, showing the terminal fulto- and the single rimoportula (arrow).