FIGURES 23–25 in Staurosirella rhombus (Ehrenberg), Ognjanova-Rumenova, Buczkó, Wojtal & R. Jahn, comb. nov.-Typification, morphology and biostratigraphic significance

FIGURES 23–25. Staurosirella rhombus, SEM. Ribbon like colonies of valves in a girdle view. 23. Two frustules joined by the spines. Note the several girdle bands in each individual and the larger valvocopulae than the rest of the elements. Scale bars = 5 μm (Fig. 25), 10 μm (Figs. 23, 24).