FIGURES 26–48 in Two new centric diatoms (Bacillariophyta) from the sub-Antarctic region

FIGURES 26–48. Arcanodiscus desmetianus Van de Vijver sp. nov. Light (LM) and Scanning electron (SEM) micrographs of the holotype population (sample BA200) from Pointe Basse, Ile de la Possession (Iles Crozet), Subantarctica. Figs 26–33 LM photographs of several frustules in girdle view. Figs 34–48. LM photographs in valve face view showing the large hyaline central area. Figs 42 & 43. SEM view of two frustules in girdle view showing the the girdle bands, several portulae and the parallel ridges on the mantle. Fig. 44. SEM view of a valve in girdle view showing the areolae and the parallel ridges on the mantle. Fig. 45. SEM view of a valve face showing different portulae (arrows) and irregular thickenings on the valve face/mantle junction. Fig. 46. SEM valve face view showing clearly the hyaline central area and the gently sloping valve face/mantle junction. Fig. 48. Internal SEM view of entire valve. Fig. 49. Internal SEM view of the areolae with rota and the openings of the portulae. Scale bars represent 10 μm except for Fig. 48 where scale bar = 1 μm.