FIGURES 7–11 in Further studies on the species diversity of the marine planktonic diatom genus Skeletonema (Bacillariophyta) in the Mexican Pacific

FIGURES 7–11. Skeletonema ardens, SEM (7, 9) and TEM (8, 10, 11). Fig. 7. A complete frustule in a chain, showing high mantle with tiny spines or knobs (small arrows), intercalary and terminal fulto- and rimoportulae (TR with an arrow), and 1:1 junctions of IF. Fig. 8. Terminal valve with high mantle bearing tiny spines or knobs (small arrows), fultoportulae (perhaps broken), a rather short rimoportula (arrow), and parts of the valvocopula and copulae. Fig. 9. Two terminal cells in division showing the IF's and the long IR's, almost touching each other (arrow). Fig. 10. Detail of TF's and TR (arrows), note the very spiny tips of the TF's. Fig. 11. Detail of a terminal truncated fultoportula showing three satellite pores at its base (arrow).