FIGURES 23–29 in Aulacoseira veraluciae sp. nov. (Coscinodiscophyceae, Aulacoseiraceae): a common freshwater diatom from Brazil

FIGURES 23–29. Aulacoseira veraluciae, SEM, external view. Scales: 5 µm (Figs 23, 29), 2 µm (Figs 24‒28). Fig. 23. Overview of the valve showing the separation spines. Fig. 24. Valve face of the separation cell. Fig. 25. Valve face of the linking cell. Figs 26, 27. Detail of the linking spines. Fig. 28. Detail of the mantle areolae occluded by velum. Fig. 29. Mantle of the linking valves and location of external rimoportulae openings (arrows).