Fig. 2 in New and interesting Surirella taxa (Surirellaceae, Bacillariophyta) from the Congo Basin (DR Congo)

Fig. 2. Surirella ebalensis sp. nov., type material from sample CCA 2070, Lomami River, DR Congo, SEM. External view. B, C, F = detail of the raphe keel with blunt spines orientated towards the valve face and which are draped over a large part of the indented mantle side. A. Overview. B–C. Detail of the valve ornamented with silica granules and blunt spines. D. Detail of the apical pole, showing the curved raphe endings. E–F. Detail of the foot pole showing the straight raphe endings. F. Short spherical shaped silica elements near the pole (arrow). Scale bars: A = 10 µm; B = 4 µm; C, F = 2 µm; D–E = 1 µm.