A–F Entomoneis sinensis sp. nov., girdle view, SEM A, B two frustules, note sigmoid girdle bands C, D central parts from Fig. A and B respectively, note the 5:2 configuration of girdle bands, i.e. five girdle bands, B1(Valvocopula, VC) to B5, associated with epivalve (EV); two girdle bands, B1(Valvocopula, VC) and B2, associated with hypovalve (HV) E, F two apices from Fig. A. Scale bars: 10 μm (A, B); 2 μm (C–F).