Staurosirella binodiformis Van de Vijver, sp. nov., LM and SEM micrographs taken from the holotype material (BR-4841, Foged sample 29) A–AP LM pictures of valves in valve face view in decreasing length AQ SEM external view of a complete valve in girdle view showing the girdle structure and the mantle AR SEM external view of a complete valve. Note the slight constriction at the valve middle, the undulating valve face surface and the series of spines AS SEM external view of a complete valve with focus on the apical pore field and the transition between valve face and mantle AT SEM external view of a complete valve AU SEM external detail of a valve apex showing the large apical pore field AV SEM internal view of a complete valve. Scale bars: 10 µm (A–AS, AV); 1 µm (AU).