FIGURES 24–30 in Taxonomic revision of Coscinodiscus variabilis (Bacillariophyta): analysis of type material, lectotypification and transfer to the genus Actinocyclus

FIGURES 24–30. Coscinodiscus variabilis Frenguelli. LM. Specimens of type population. 24–26. Valve view showing the variation on the same individual from three different focuses. 24. Note the central area, fasciculation, mantle areolae and external marginal ring of rimoportulae which are coincident with the fascicles. 25. Detail of areolae and pseudonodule on valve face. 26. Note the marginal ring of rimoportulae. 27. Valve tilted showing the detail of the rimoportulae and their orientation on the valve mantle and the hyaline rays aligned with them. 28–30. Valve views showing the variation of the central area and hyaline rays. 28. Specimen with incomplete hyaline rays closer to the valve margins and with rounded ends. 29. Specimens with complete or nearly complete clock-hand shape hyaline rays that reach the valve margins and may not connect the valve center. 30. Specimens with incomplete hyaline rays with abrupt ends that insert from the center of the valve face and never reach the valve margins. Scale bar: 10 µm.