Figures 6 from: Yu P, You Q, Pang W, Wang Q (2022) Two new freshwater species of the genus Achnanthidium (Bacillariophyta, Achnanthidiaceae) from Qingxi River, China. PhytoKeys 192: 11-28. https://doi.org/10.3897/phytokeys.191.78489

Figures 6 A–CAchnanthidium qingxiense sp. nov., SEM external views of raphe valve A external view of an entire raphe valve B apices of the valve, showing the distal raphe ends C central area of the valve, showing the proximal raphe ends. Scale bars: 5 µm (A); 1 µm (B, C).