FIGURES 15–34. Gomphonema curatorum sp. nov. LM and SEM images from the type population. 15–27. LM images. 15. Initial valve. 18. Holotype specimen. 27. Girdle view. 28–34. SEM images. 28. Internal view of an entire valve. 29. External view of an entire frustule, tilted 40°. 30. External view of footpole with pore field. 31. Internal view of valve centre showing alveoli without stubs or struts and curved proximal raphe fissures. 32. External view of the central part of a valve tilted 40° showing foramina and depressions near the central raphe endings. 33. External view of the central part of a valve lacking depressions in the central area. 34. External view of headpole, foramina at the border of the axial area strongly C-shaped. Scale bar (SEM) = 2 μm, except Figs. 28 & 29, scale bar = 10 μm.