FIGURES 105–116. Chaetoceros curvisetus. Figs 105, 114: field material. Figs 106–113, 115–116: culture material. Figs 107, 109–112: strain PMFD2. Figs 108, 113, 115–116: strain PMFD6. Fig. 106: strain PMFD8. Figs 105–106, 114: LM. Figs 107, 109–112: TEM. Figs 108, 113, 115–116: SEM. 105) A chain in narrow girdle view showing orientation of the setae. 106) Intercalary cells with a single plate-like chloroplast. 107) Detail of the valve showing the valve ornamentation pattern. The arrow shows a dot-like costa end. 108) Outside view of the terminal valve with the hyaline rim on the marginal ridge and external flattened tube of the rimoportula. 109) Detail of the valve with external flattened tube of the rimoportula. 110) Central annulus with the slit-like aperture of the rimoportula. 111) Detail of the girdle. 112) Detail of a girdle band with transverse ribs and the inter-rib areas perforated with poroids. 113) Detail of a seta. 114) A cell with the resting spore. 115) Internal view of the resting spore primary valve with the fissured collar. 116) External view of the resting spore perforated by poroids. Scale bars: 105=20 μm; 106, 114=10 μm; 108, 115–116=5 μm; 107, 109–113=1 μm.