FIGURES 81–87 in Taxonomic revision and morphological cladistics analysis of the diatom genus Anorthoneis (Cocconeidaceae), with description of Anorthoneis arthus-bertrandii sp. nov.

FIGURES 81–87. Anorthoneis hyalina specimens from Hustedt's cleaned material AM791, AM794, Beaufort, North Carolina, USA (Hustedt Diatom Collection, Bremerhaven, Germany), SEM images. (81) Raphe-sternum valve in external view; (82) External view of the apically elongated distal raphe ending terminating in a hyaline submarginal area; (83) Detail of coaxial proximal raphe endings in external view; (84) Tilted external view (60°) of raphe-sternum valve; (85) Tilted external view (60°) of raphe-sternum mantle terminating in narrow submarginal area bordered by a thickened rim (arrows). Smaller non-hymenate poroids are present at the end of each biseriate stria (white arrowhead) and ligulate structures are visible on the marginal area (black arrowhead); (86) Raphe-sternum valve in internal view; (87) Detail of the internal surface of raphe-sternum valve showing the biseriate mantle striae. Scale bars: Figs 81, 84, 86 = 10 μm; Fig. 87 = 2 μm; Figs 82, 83, 85 = 1 μm.