Figures 10-17 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136

Figures 10-17 Hannaea cf. arcus, SEM10–13 external view of valve, note linking spines and central area 14–17 internal view of valve, note central area lacking buttressing (15). Scale bars: 10 μm (10, 14), 2 μm (11–13, 15–17).