FIG. 6 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

FIG. 6. — SEM images of Kobayasiella subtilissima (Cleve) Lange-Bertalot:A, external view of the complete valve; B, internal view of the complete valve; C, external view of central area showing the multiseriate poroid covers between irregular formed virgae; D, internal view of the central area showing T-shaped proximal fissures and irregular orientated areolae; E, external view of the valve apex showing a partially curved proximal fissure opening into an elliptic surface depression; F, internal valve view of the apex. Helictoglossa expanded onto a highline apex. Areolae continue around the apex. Scale bars: A, B, 5 µm; C, 1 µm; D, F, 3 µm; E, 2 µm.