Ulnaria shun-biseriata sp. nov., SEM, internal view A–C three valves with closed valvocopulae D middle part detail from C note central area flanked by a few marginal striae only on one side and serrated projections over each virga (two arrows) E, F two apical details from C note unornamented valvocopula at both apices (arrow respectively). Scale bars: 10 μm (A–C); 1 μm (D–F).

 
 
  Part of: Zheng Y, Liu B, Rioual P, Long J-Y, Zhou M (2024) Ulnaria shun-biseriata sp. nov. (Bacillariophyta) from the Shun River in Hunan Province, China. PhytoKeys 246: 315-327. https://doi.org/10.3897/phytokeys.246.130942