FIGURES 20–26 in A new species of an unexplored diatom genus: Gomphosphenia minima sp. nov. (Cymbellales, Rhoicospheniaceae)

FIGURES 20–26. SEM micrographs of Gomphosphenia minima C. Delgado, S. Blanco, L. González-Paz & S.F.P. Almeida sp. nov. 20. Internal valve view showing the raphe ending and the transapical uniseriate striae. 21. External view of the central area showing the raphe ending slightly expanded into drop-like pores. 22. Internal view of the central area showing the raphe ending curved to one side. 23. External view of the valve showing the striae composed of a single areola. 24. Girdle view of the entire frustule showing the mantle striae composed by row of individual pores (elongated in the pervalvar direction). 25. External valve showing the narrowly rounded headpole. 26. External valve showing the narrowly rounded footpole. Scale bar = 1 μm (Figs 20–26).