FIGURES 33–39 in Frankophila dalevittii, a new freshwater diatom (Bacillariophyta) from Campbell Island

FIGURES 33–39. Frankophila dalevittii Van de Vijver & Goeyers sp. nov. Scanning electron microscopy views. Holotype population from Campbell Island (sample BAS303). 33. SEM detail of several frustules connected by linking spines showing the girdle structure and the lack of an apical porefield. 34. SEM detail of the interdigitating linking spines. Also note the irregular siliceous ridges on the girdle band. 35–36. SEM external valve face views. Note the presence of the linking spines and the reduced external raphe slits (arrows). 37–38. SEM internal valve face views of two entire valves showing the reduced internal raphe slits (arrows). 38. SEM detail of the internal raphe slit. Scale bars represent 10 µm except for Figs 33, 34 & 39 where scale bars = 1 µm.