Figures 2 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 2 A–FAchnanthidium anhuense sp. nov., SEM external views of raphe valve A, B external view of an entire raphe valve C, E apices of the valve, showing the distal raphe ends D, F central area of the valve, showing the proximal raphe ends, D seems detail of A and F of B. Scale bars: 5 µm (A, B); 1 µm (C–F).