Ulnaria fanjingensis sp. nov., girdle view, SEM. A a frustule in girdle view B–D details from A, note the 3:2 configuration of girdle bands E, F apical details from D, showing the closing plates (two arrows respectively) and two horn-like projections (F, two arrowheads). Scale bars: 20 μm (A); 2 μm (B–D); 1 μm (E, F).