Ulnaria xieriverensis sp. nov., internal view, SEM A a complete valve B middle part detail from A, note central area is completely absent C, D two apical details from A, note one rimoportula located against the mantle (D, arrow) E, F two other apical details. Scale bars: 10 μm (A); 1 μm (B–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