FIGURES 67–84. Rhoicosphenia kloseri, SEM. 67–77. External view of the R-valve. 78–84. Internal view of the R-valve. 67–73. External view of size diminution series. Note the pores in the first column along the raphe are larger in diameter than the remaining pores. 74. External view of valve and their basal pole (Fig. 75) central area (Fig. 76) and head pole (Fig. 77). Note the same endings of raphe at poles and drop shape endings at the central area. 78–83. Internal view of size diminution series. 84. Central area with raphe hooked in the same direction. Scale bars: Figs 67, 68, 78, 79 = 3 μm, Figs 69– 71, 80, 81, 83 = 5 μm, Figs 72, 73, 82 = 8 μm, Fig. 74 = 10 μm, Figs 75–77, 84 = 2 μm.

Published as part of Thomas, Evan W. & Ligowski, Ryszard, 2016, Rhoicosphenia kloseri, a new isopolar Rhoicosphenia (Bacillariophyta) species from the Antarctic with comparison to other isopolar Rhoicosphenia, pp. 50-58 in Phytotaxa 265 (1) on page 55, DOI: 10.11646/phytotaxa.265.1.4, http://zenodo.org/record/13670722