Ulnaria sangzhi-biseriata sp. nov., internal view, SEM A a complete valve B middle detail from A, showing the central area C, D two apical details from A, note part triseriate striae (arrows) E another complete valve F middle detail from E. Scale bars: 10 μm (A, E); 2 μm (B–D, F).

 
 
  Part of: Liu B (2023) The diatom genus Ulnaria (Bacillariophyta) in China. PhytoKeys 228: 1-118. https://doi.org/10.3897/phytokeys.228.101080