FIGURES 1–35 in Planothidium africanum sp. nov., a new freshwater diatom (Bacillariophyta) species from Tanzania

FIGURES 1–35. Planothidium africanum Van de Vijver, Gogne, Hoogsteyns, Van de Velde, Vlaminck, Kabota, Teunen & C.E.Wetzel, sp. nov. LM and SEM pictures taken from the holotype slide (BR-4778, Brook near Morogoro, Tanzania, sample L10 Stone). Figs 1–14. LM diminution series of the rapheless valve. Figs 15–28. LM diminution series of the raphebearing valve. Fig. 29. SEM external view of an entire rapheless valve. Fig. 30. SEM internal view of an entire rapheless valve. Fig. 31. SEM external view of an entire raphebearing valve. Fig. 32. SEM internal view of an entire raphe-bearing valve. Fig. 33. SEM external detail of the valve apex of a rapheless valve showing the structure of the striae. Note the mantle striae composed of irregular groupings of areolae. Fig. 34. SEM external detail of the girdle. Fig. 35. SEM internal detail of the cavum spanning the neighboring striae. Scale bars represent 10 µm except for Figs 33–35 where scale bar = 1 µm.