FIGURES 33–38 in Taxonomy, frustular morphology and systematics of Platichthys, a new genus of canal raphe bearing diatoms within the Entomoneidaceae

FIGURES 33–38. SEM. Platichthys darwiniana sp. nov. 33, 34. Internal valve view of the same specimen at different tilting degree, note the position of fibulae (black arrow) and the internal central raphe endings (white arrow). 35. Broken valve showing the position of the fibulae (arrow), note the transapical striae merging into the particular fibulae. 36. Close up of the specimen illustrated in Fig. 34 with an internal view of the central valve part, note the distant position of the two central fibulae (arrowheads) and the central nodule (arrow). 37. Central part of the valve interior with close up of the central nodule with double helictoglossa (arrowhead) and the presence of portulae (white arrow). 38. Apical part of the valve interior, note the presence of simple helictoglossa (arrowhead) and the portulae (white arrow).