Figures 7 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 7 A–EAchnanthidium qingxiense sp. nov., SEM internal views of raphe valve A, B internal view of an entire raphe valve C apices of the valve, showing the distal raphe ends E central area of the valve, showing the proximal raphe ends D internal areola openings with fine hymenate structures. Scale bars 5 µm (A, B); 1 µm (C, E); 0.3 µm (D).