FIGURES 42–47 in Analysis of the type material of Navicula brachysira Brébisson with the description of Brachysira sandrae, a new raphid diatom (Bacillariophyceae) from Iles Kerguelen (TAAF, sub-Antarctica, southern Indian Ocean)

FIGURES 42–47. Brachysira sandrae. All pictures taken from the holotype population (sample B13). Fig. 42. External view of an entire valve showing the most typical features such as the marginal ridge, the striae composed of 2–4 areolae, the simple raphe endings and the mantle striae. Fig. 43. External view of an entire valve in oblique position showing clearly the marginal ridge and the ridge bordering the raphe. Fig. 44. Detail view of the central area. Not the presence of the papillae, the irregular length of the areolae and the simple proximal raphe endings. Fig. 45. External detail of a valve apex with the typical axial ridge terminating before the marginal ridge, the simple, almost straight distal raphe endings and the diminishing number of areolae per stria. Fig. 46. Internal view of an entire valve. Fig. 47. Internal detail of the central area with the typical weakly bent proximal raphe endings. Scale bar represents 10 µm, except for Figs 44 & 47 where scale bar = 5 µm.