FIGURES 57–62 in Taxonomic revision and morphological cladistics analysis of the diatom genus Anorthoneis (Cocconeidaceae), with description of Anorthoneis arthus-bertrandii sp. nov.

FIGURES 57–62. Anorthoneis hummii specimens from Hustedt's cleaned materials AM791, AM792, Beaufort, North Carolina, USA (Hustedt Diatom Collection, Bremerhaven, Germany), SEM images. (57) External sternum valve with asymmetrical hyaline central area and small roundish terminal areas (arrow); (58) Detail of sternum valve mantle terminating in a wide hyaline marginal area; (59) Detail of roundish/transapically elongated areolae externally occluded by thick perforated hymenes; (60) Detail of sternum valve mantle; (61) Internal view of areolae occluded by perforated hymens; (62) Internal sternum valve showing sternum and hyaline central area. Scale bars: Fig. 57 = 10 μm; Figs 62, 63 = 5 μm; Figs 58, 60 = 2 μm; Figs 59, 61 = 1 μm.