Ulnaria jishou-biseriata sp. nov., girdle view, SEM A a dividing cell in girdle view B middle detail from A, note the mantles are hyaline in the central area C, D two apical details from A, showing both epivalve and hypovalve with associated three girdle bands (labelled B1 to B3) E, F two other apical details also show both epivalve and hypovalve with associated three girdle bands in a dividing cell (labelled B1 to B3). Scale bars: 20 μm (A); 2 μm (B–F).