FIGURES 116–121 in Taxonomic revision and morphological cladistics analysis of the diatom genus Anorthoneis (Cocconeidaceae), with description of Anorthoneis arthus-bertrandii sp. nov.

FIGURES 116–121. Anorthoneis vortex specimens from Sterrenburg (1987) cleaned material from Bergen aan Zee, The Netherlands. (116) External view of sternum valve with slightly visible eccentric sternum and imperforated areolae in the asymmetrical hyaline-like area (arrow); (117) Tilted external view (60°) of sternum valve showing the wide convex mantle; (118) Detail of the sternum valve areolae; (119) Internal view of the sternum valve mantle showing smaller poroids present at the end of each stria close to the valve margin (arrow); (120) Internal view of sternum valve; (121) Tilted internal view (60°) of sternum valve showing the thickening of sternum and eccentric central area. Scale bars: Figs 117, 120 = 5 μm; Figs 116, 121 = 2 μm; Figs 118, 119 = 1 μm.