FIGURES 27–32 in Taxonomy, frustular morphology and systematics of Platichthys, a new genus of canal raphe bearing diatoms within the Entomoneidaceae

FIGURES 27–32. Platichthys darwiniana sp. nov. SEM. 27. Valve apex showing strongly bent raphe apical ending (arrow). 28. View of an apical valve part with small groove formed by the strongly bent raphe end (arrowhead) which is not visible. 29. Apical part of the frustule showing strongly bent raphe end (arrowhead). 30–32. Internal view of a broken valve. 30. Internal view showing the compression of the valve (marked by the small arrowheads) and narrow hyaline mantle (arrow). 31, 32. Close up of the broken valve, note the striae forming areolae positioned in shallow grooves (arrowhead in Fig. 32).