A–D Surirella suiningensis, sp. nov., internal view, SEM A one valve with valvocopula, note the open nature of valvocopula (arrow) B apical detail from A, note two helictoglossa-like processes (two arrows) C detail of open part of valvocopula D detail of valvocopula showing the rimmed areolae internally. Scale bars: 20 μm (A); 4 μm (B); 1 μm (C, D).

  Part of: Long J-Y, Kociolek JP, Williams DM, Liu B, Mo W-H, Chen J-H (2022) Two new freshwater species of Surirella (Bacillariophyta) from the Wuling Mountains, China. PhytoKeys 201: 35-49. https://doi.org/10.3897/phytokeys.201.79626