FIGURES 30–39 in Two new Nitzschia species (Bacillariophyceae) from China, possessing a canal-raphe-conopeum system

FIGURES 30–39. Nitzschia gaoi, sp. nov., external views, SEM. 30–31. Two complete valves, note the nitzschioid symmetry of the raphe system. 32–33. Apices, note the constant width of the conopeum. 34–35. Apices showing the apical pore fields and the hooked terminal fissures towards the dorsal side. 36. Intact central area, showing costae, conopea, and the fusing of costae with conopeal spines (arrowheads). 37. Eroded area showing small conopea occuring on each side of each costa, and a transverse row of areolae appearing in a girdle band. 38. Eroded area showing striae and areolae. 39. Broken central area, showing the canal-raphe-conopeum system (cc = conopeal canal). Scale bars = 10 μm (Figs 30–31), 1 μm (Figs 32–39).