FIGURES 42–48 in Taxonomic revision and morphological cladistics analysis of the diatom genus Anorthoneis (Cocconeidaceae), with description of Anorthoneis arthus-bertrandii sp. nov.

FIGURES 42–48. Anorthoneis eurystoma specimens from Hustedt cleaned material AM791, Beaufort, North Carolina, USA (Hustedt Diatom Collection, Bremerhaven, Germany), SEM images. (42) Raphe-sternum valve in external view; (43) Raphe-sternum valve in internal view showing the open valvocopula exhibiting a crenulated inner margin (arrows); (44) Tilted external view (60°) of raphesternum valve. (45) External view of a distal raphe ending terminating in a hyaline submarginal area. (46) Detail of expanded, pore-like, coaxial central raphe endings in external view; (47) Internal view of slightly oppositely deflected, central raphe endings converging on a central nodule; (48) Internal view of a distal raphe ending terminating in a reduced helictoglossa. Scale bars: Figs 42–44 = 5 μm; Figs 45–48 = 2 μm.